JP2002111312A - Waveguide filter - Google Patents

Abstract

(57) [Problem] To provide a waveguide filter in which a partition for narrowing a cross section perpendicular to a traveling direction of a wave is formed inside a waveguide, and to facilitate manufacture and connection with other devices. SOLUTION: As an example, a partition 3 is opened in a plane parallel to the traveling direction of the wave, and has a diaphragm direction inside which is parallel to the plane.
Is prepared separately from the box-shaped component 2 formed with the above, and the substrate 1 formed with the input / output end with the outside of the filter using a conductor,
These were joined so that the opening surface of the component 2 and the surface on which the input / output end of the substrate 1 was formed faced each other. Further, as another example, the input / output opening surface of the waveguide is formed on the bottom surface, and the waveguide and the partition are formed such that a box-shaped component part is formed such that the partition is exposed. A plurality of components were joined to a substrate on which input / output terminals with the outside of the filter were formed using conductors at positions corresponding to the input / output opening surfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide filter provided with a partition for forming an inductive window inside a waveguide, and more particularly to a waveguide filter which is easy to manufacture and easily connected to other devices. The present invention relates to a waveguide filter.

[0002]

2. Description of the Related Art For example, a waveguide is used as a transmission line for transmitting electromagnetic waves in a microwave band or a millimeter wave band, and such a waveguide is used to constitute a circuit of a wireless communication device or the like. ing. Also, when a partition plate or a pillar is provided inside the waveguide to form an inductive window, for example, the characteristics of a bandpass filter are realized, and a waveguide provided with such a partition plate or the like is used as a waveguide filter. ing. Note that examples of the waveguide include a rectangular waveguide having a rectangular (square or rectangular) cross-sectional shape, a circular waveguide having a circular cross-sectional shape of the waveguide, and the like.

As an example, a rectangular waveguide is usually manufactured entirely by machining, and more specifically, is manufactured by brazing a metal plate called a flange to a square tube manufactured by die working. Further, the rectangular waveguide filter is manufactured by performing additional machining in the same manufacturing process as that of such a rectangular waveguide, and specifically, manufactured by die processing as described above. Before attaching the flange to the square pipe, additional processing and brazing of the partition plate and column are performed in an arrangement that satisfies the electrical characteristics of the filter, and then the flange is attached to the square pipe to which the partition plate and column are brazed. It is produced by brazing.

In FIG. 5, a partition plate 22 is set up on the inner wall surface of a waveguide 21 having a rectangular cross section, and
2A and 2B show an example of a general appearance of a waveguide filter having a structure in which flanges 23 are attached to both end opening surfaces. FIG. 1A is a perspective view when viewed from the front, and FIG. (A) is a perspective view when viewed from the lower side of the figure, and (c) is a perspective view when viewed from the right side of the figure (b). . As shown in FIG. 3C, the flange 23 is connected to another flange by, for example, 4.
Two screw holes N are provided.

[0005] In these drawings, a portion visible from the outside is indicated by a solid line, while a portion which is not seen from the outside and is seen through is indicated by a dotted line. In this specification, the partition plate 2
In the case where there are a plurality of similar components in one drawing such as 2 and the screw hole N, for convenience of explanation, only one of these components is denoted by a reference numeral unless otherwise necessary. Will be described.

FIG. 6 is a cross-sectional view of the waveguide filter shown in FIG. 5 as viewed from the same direction as in FIG. 5A. In FIG. 6, when the electromagnetic wave transmitted inside the waveguide filter is a TE wave, that is, only the component in which the electric field of the electromagnetic wave is perpendicular to the traveling direction of the electromagnetic wave (the left and right direction in FIG. 6). The direction of the electric field E (the direction perpendicular to the drawing) and the direction of the magnetic field H (the left and right directions in the drawing as well as the traveling direction of the electromagnetic wave) are shown. In this case, the cross section shown in FIG. 6 is a cross section parallel to the H plane of the waveguide filter.

Here, the H plane is, for example, parallel to the loop plane created by the magnetic field of the electromagnetic wave when the electric field of the electromagnetic wave has a TE wave having only a cross-sectional component perpendicular to the traveling direction of the electromagnetic wave as described above. I say something like that. On the other hand, the electric field in this case has only a component perpendicular to the H plane, and the plane perpendicular to the H plane is called an E plane.

By the way, when connecting such a waveguide filter to a radio device or a measuring instrument, for example, when connecting the waveguides to each other, the flange 2 of one of the waveguides is used.
The two waveguides are connected by abutting the flange 3 with the flange 23 of the other waveguide, and fixing the flanges 23 through screws through the screw holes N provided in the flanges 23.

When a waveguide filter is connected to a coaxial cable with a connector or the like, a connection called a transducer is interposed between the waveguide filter and the coaxial cable or the like. Here, this converter has a structure in which, for example, a flange is attached to an opening surface on one side of a waveguide, and a coaxial connector or the like is attached to the other side, and is coaxial with the waveguide filter. The cable and the like are connected with little loss.

In the above description, a waveguide filter in which a partition plate is formed inside a waveguide is shown. For example, as shown in FIG. Even with the structure in which the inductive window is formed, the same filter function as in the case where the partition plate is set up can be realized. 6, the illustration of the flange attached to the waveguide 31 is omitted, and the directions of the electric field E and the magnetic field H are the same as those shown in FIG. .

[0011]

However, in the above-described conventional waveguide filter, it is necessary to additionally form a partition plate or the like inside the waveguide manufactured by, for example, die processing. Therefore, there is a problem that complicated processing is required and the number of manufacturing steps is increased.

In the conventional waveguide filter as described above, since the structure is used to connect to another waveguide or the like using a flange, for example, the connection portion (that is, the flange portion) becomes large. There was a problem that it took time to fix the screws. Also, for example, in a circuit of a wireless communication device or the like that handles a microwave band or the like, many surface mount components that need to be connected to a conductor pattern formed on a substrate are used. When a filter is used, the above-described converter is required for connection, and there is a problem that a connection portion becomes large and costs increase.

The present invention has been made to solve such a conventional problem, and has as its object to provide a waveguide filter which is easy to manufacture and can be easily connected to other devices. Specifically, for example, a waveguide filter is provided in which a partition plate or a pillar can be easily formed, and can be easily connected to another device having an input / output end using a conductor. I do.

[0014]

In order to achieve the above object, in a waveguide filter according to the present invention, a waveguide filter in which a partition for narrowing a cross section perpendicular to the traveling direction of a wave is formed inside the waveguide. Was constructed as follows. In other words, a box-shaped component having a surface parallel to the wave traveling direction opened and forming a partition in the drawing direction parallel to the surface inside, and a substrate formed with conductors to form input and output ends with the outside of the filter Were separately prepared, and the component and the substrate were joined so that the opening surface of the component and the surface of the substrate on which the input / output end was formed faced each other, to form a waveguide filter.

Therefore, one surface of the waveguide filter is constituted by the above-mentioned substrate, and all the partitions are exposed to the outside in the above box-shaped component. Therefore, the partitions are formed before the component and the substrate are joined. This makes it very easy to manufacture such a component, and the whole waveguide filter is also very easy to manufacture. At the same time, since the input / output terminal using the conductor is formed on the above-described substrate, it is very easy to connect, for example, to another device having the input / output terminal using the conductor.

Here, as the partition referred to in the present invention, for example, a partition plate as shown in FIG. 5 or FIG. 6 may be used, or a column as shown in FIG. 7 may be used. And other shapes may be used. The diaphragm direction of the partition indicates the direction in which the cross section of the waveguide is reduced. For example, FIG. 6 shows an example of the diaphragm direction when a partition plate is used as a partition. FIG. 7 shows an example of the drawing direction when a pillar is used as a partition.

Further, in the waveguide filter according to the present invention,
A waveguide filter in which a partition for narrowing a cross section perpendicular to the wave propagation direction was formed inside the waveguide was constructed as follows.
That is, a plurality of parts having a shape in which the input / output opening surface of the waveguide is formed on the bottom surface and the waveguide and the box-shaped component part in which the partition is formed are divided so that the partition is exposed, By using a conductor at a position corresponding to the input / output opening surface, a substrate having an input / output end with the outside of the filter is prepared separately from each other, and the plurality of components are joined to each other. The component and the substrate were joined so that the bottom surface and the surface of the substrate on which the input / output end was formed faced each other, to form a waveguide filter.

Therefore, in the above-described plurality of parts obtained by dividing the box-shaped component part in which the waveguide and the partition are formed, all the partitions are exposed to the outside, and thus the partitions are provided before the plurality of parts are joined. It becomes very easy to produce the plurality of components. At the same time, since the above-mentioned components are box-shaped, the connection between the components and the substrate is easy, so that the entire waveguide filter is very easy to manufacture, and the substrate has a conductor. Since the input / output terminals are formed by using the conductors, it is very easy to connect to other devices or the like having the input / output terminals using the conductor, for example.

The term "exposed partition" in the present invention means that, for example, when a certain component is viewed from the outside, a partition provided on the component is not hidden by another part of the component. It means that the partition can be seen directly from the outside. A part in which such a partition is exposed can be easily manufactured by, for example, die machining or cutting.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an example of an overview of the waveguide filter of the present embodiment. FIG. 1A is a perspective view when viewed from the front, and FIG. 1B is a view shown in FIG. FIG. 3C is a perspective view when the object shown in FIG. 3B is viewed from the lower side of the figure, and FIG. 2A is an exploded perspective view of the waveguide filter shown in FIG. 1 as seen through, and FIG. 2B is an enlarged view of a portion A shown in FIG. In these figures, a portion seen from the outside is indicated by a solid line, while a portion which is not seen from the outside and is seen through is indicated by a dotted line.

As shown in these figures, the waveguide filter of the present embodiment has a substrate 1 on which an input / output end with the outside of the filter is formed using a conductor, and a conductor 1 on which a plurality of partition plates 3 are formed. The case 2 is prepared as a separate component, and these components are combined and configured.

Here, taking FIG. 1A as an example, the horizontal direction in FIG. 1A corresponds to the traveling direction of the electromagnetic wave transmitted through the waveguide, and a cross section perpendicular to the traveling direction (this example). In this case, the partition plate 3 that narrows the four cross sections in the vertical direction corresponds to a partition that narrows the cross section, and the vertical direction corresponds to the drawing direction of the partition plate 3. Further, the cross-sectional shape of the waveguide constituting the waveguide filter of the present example is rectangular.

The conductor case 2 is made of, for example, a metal or a resin obtained by plating a metal conductor, and except for one side surface of the waveguide filter of this embodiment (the surface corresponding to the substrate 1 in this embodiment). It has a box-shaped structure with an opening. Here, the opening surface of the conductor case 2 is a surface parallel to the traveling direction of the electromagnetic wave transmitted through the waveguide filter.
It corresponds to the H plane.

[0024] (in this example, corresponds to that in the interior of the waveguide) inside the conductor casing 2 plurality of partition plates 3 in the example similar arrangement and the waveguide filter of the conventional TE ₁₀ mode
Is formed, and the interior of the conductor case 2 is hollow except for the partition plate 3.

More specifically, in the present example, the four sections perpendicular to the longitudinal direction of the waveguide have a shape protruding inward from two side surfaces of the waveguide that do not face the substrate 1. Two rectangular partition plates 3 are set up on the inner wall surface of the conductor case 2. In other words, taking FIG. 1A as an example, in each section, a partition plate protruding downward from the upper surface and a partition plate protruding upward from the lower surface shown in FIG. The two partition plates are provided, and the larger the diaphragm in the vertical direction by the partition plate, the smaller the area of the cross section through which the wave can pass. The partition plate 3 of this example
Is parallel to the opening surface of the conductor case 2.

In the waveguide filter of this embodiment, the interior of the waveguide is partitioned by the partition plate 3 as described above, so that a space serving as a resonator is realized between adjacent sections where the partition plate 3 is formed. Resonating the passing wave and opening the window (inductive window) by opening a part of the cross section instead of completely closing the cross section by the partition plate 3, thereby coupling (inducing) each resonator space. Sexual coupling) to realize the function as a filter.

The conductor case 2 of the present embodiment as described above has a structure in which all the partition plates 3 are exposed to the outside (in this embodiment, to the substrate 1 side). Alternatively, it can be easily manufactured by mechanically performing a cutting process of cutting or shaving a rectangular parallelepiped metal or the like.

The substrate 1 is made of, for example, a general resin, Teflon, or ceramic, and is a component that constitutes one side surface of the waveguide filter of the present embodiment. As shown in FIGS. 1A and 1B, the component is longer in the longitudinal direction than the conductor case 2. Further, in this example, the surface of the waveguide formed by the substrate 1 is the H plane as described above, and the inductive window perpendicular to the H plane is provided by the partition plate 3 described above.

As shown in FIGS. 2A and 2B, both ends of the substrate 1 in the longitudinal direction (for example, FIG.
In (a), at the left end and the right end in the figure), an input / output end with the outside of the filter is formed using a conductor on a surface facing the inside of the conductor case 2. Specifically, the input / output end of the present example is located at the center of the both ends inward from the ends (for example, in FIG. 1A, from the left end to the right side, or from the right end to the left side). Input / output pattern 4 formed of a conductor pattern formed (toward), an earth pattern 5 formed of a conductor pattern formed in a loop shape so as to surround the input / output pattern 4, and both ends of the conductor case 2 in the longitudinal direction. And an input / output pin 6 formed of a conductor pin provided at a position P at the tip of the corresponding input / output pattern 4. The input / output pattern 4 inputs and outputs an electromagnetic wave transmitted through the waveguide filter, and the ground pattern 5 is grounded.

The input / output pins 6 are made of, for example, a metal or a resin obtained by plating a metal conductor, and in this example, the pins stand in the direction perpendicular to the drawing direction of the partition plate 3, that is, the drawing It is fixed to a predetermined position P of the input / output pattern 4 by soldering or using a conductive adhesive so that the direction is orthogonal to the axis of the pin.

As described above, the length of the substrate 1 in the longitudinal direction is larger at both ends than the length of the conductor case 2. For example, as shown in FIG. And the conductor case 2 in combination,
Part of the input / output pattern 4 and part of the ground pattern 5 are located outside the filter at both ends of the substrate 1. The covers at both ends in the longitudinal direction of the conductor case 2 are not completely closed, and a gap Q is provided so that the input / output pattern 4 or the ground pattern 5 does not contact the conductor case 2. .

As described above, the waveguide filter of this embodiment is
The substrate 1 on which the input / output pins 6 are connected or the like and the input / output ends with the outside of the waveguide filter are formed, and the conductor case 2 on which the partition plate 3 is formed, for example, soldered or conductive adhesive. It is comprised by joining using. Here, when joining the substrate 1 and the conductor case 2, for example, as shown in FIG.
As shown in (a), the surface on which the input / output end of the substrate 1 is formed and the opening surface of the conductor case 2 are opposed to each other.

In the waveguide filter of this embodiment, for example, when an electric signal is applied to the input / output pattern 4 on one side from outside the filter, the electric signal is applied to the input / output pattern connected to the input / output pattern 4. The electromagnetic wave is output from the pin 6 to the space in the waveguide as an electromagnetic wave, and the electromagnetic wave is excited in the waveguide, and the electromagnetic wave arrives at the opposite input / output pin 6 and is received by the input / output pin 6. Then, the electromagnetic wave travels inside the waveguide such that the electromagnetic wave is output as an electric signal from the input / output pattern 4 (opposite side) connected to the input / output pin 6 to the outside of the filter. At this time, in the waveguide filter of this example, since the partition plate 3 is formed inside the waveguide, filtering according to the arrangement of the partition plate 3 is performed on the electromagnetic waves passing through the inside of the waveguide. You.

[0034] Similar to above in the waveguide filter of this embodiment having the structure, for example, the waveguide filter internal structure have a same structure as the waveguide filter of TE ₁₀ mode waveguide And an input / output end (input / output pattern 4 or ground pattern 5) on the substrate 1 located outside the filter can be directly connected to, for example, a strip line or the like. Therefore, surface mounting can be easily performed without using a converter as shown in the conventional example.

Therefore, in the waveguide filter of the present embodiment, the substrate 1 and the conductor case 2 as described above are separate parts.
Since all the partition plates 3 are exposed to the outside in a state before these components are combined, it is very easy to form the partition plates 3 inside the waveguide as compared with the related art. , Making it very easy,
For example, the number of manufacturing steps and the number of assembling steps can be reduced. At the same time, in the waveguide filter of the present embodiment, one side surface of the waveguide is formed of the substrate 1 and the input / output end with the outside using the conductor is formed on the substrate 1. Connection with other devices having an output terminal becomes very easy.

Specifically, in the waveguide filter of this embodiment,
For example, it is possible to directly connect to a conductor outside the filter without employing the connection configuration using a flange as shown in the above conventional example, so that a waveguide filter with a small connection portion is realized. can do. Further, in the waveguide filter of this example, it is possible to directly use a connection method such as wire bonding used in a circuit handling a microwave band or a millimeter wave band, for example, as shown in the above-described conventional example. Since a simple converter is not required, cost reduction and the like can be realized.

In the present embodiment, as a preferred embodiment, the conductor case 2 is an integral part. However, for example, the conductor case 2 can be configured as a plurality of parts. Further, for example, various shapes may be used as the box-shaped shape of the conductor case 2, the input / output end formed on the substrate 1, the method of joining the substrate 1 to the conductor case 2, and the like.

For example, in the substrate 1 of the present embodiment, the ground pattern 5 is formed in a loop shape so as to surround the input / output pattern 4, but conversely, the input / output pattern is formed in a loop shape so as to surround the ground pattern. By forming them, it is possible to configure the same input / output terminals as in this example. Also,
In this example, the case where the function of the filter is realized by using the partition plate has been described. However, the function of the filter can be realized by using, for example, the pillars shown in FIG.

Next, a second embodiment of the present invention will be described with reference to the drawings. 3A and 3B show an example of an overview of the waveguide filter of the present embodiment. FIG. 3A is a perspective view when viewed from the front, and FIG. 3B is a view shown in FIG. FIG. 3C is a perspective view when the object shown in FIG. 3B is viewed from the lower side of the figure, and FIG. 4A is an exploded perspective view of the waveguide filter shown in FIG. 3 as seen through, and FIG. 4B is an enlarged view of a cross section taken along the line XX shown in FIG. It is. In addition,
In these figures, the portion seen from the outside is shown by a solid line, while the portion that is not seen from the outside and is seen through is shown by a dotted line.

As shown in these figures, the waveguide filter of the present embodiment has a substrate 11 on which input / output terminals with the outside of the filter are formed using conductors and a plurality of partition plates 13 formed. The two conductor cases 12a and 12b are prepared as separate components, respectively, and are configured by combining these three components.

Here, taking FIG. 3A as an example, the left-right direction in FIG. 3A corresponds to the traveling direction of the electromagnetic wave transmitted through the waveguide, and a cross section perpendicular to the traveling direction (this example). In this case, the partition plate 13 that narrows four cross sections in the vertical direction corresponds to a partition that narrows the cross section, and the vertical direction corresponds to the partition plate 13.
In the drawing direction. Further, the cross-sectional shape of the waveguide constituting the waveguide filter of the present example is rectangular.

Further, the two conductor cases 12a, 1
2b have the same structure, that is, the two conductor cases 12a and 12b
a and 2b are combined and the box-shaped component is perpendicular to the bottom surface (for example, the lower surface in FIG. 3B) and the wave traveling direction (for example, FIG. 3B). In FIG. 3B, two parts having a shape bisected so that all partitions 13 are exposed with a plane parallel to the plane (for example, a plane parallel to the plane shown in FIG. 3B). Has become. In FIG. 3, the two conductor cases 12
When a and 12b are collectively shown, they are shown as conductor cases 12.

Each of the conductor cases 12a and 12b is made of, for example, a metal or a resin obtained by plating a metal conductor. A box-shaped component combining the two conductor cases 12a and 12b has a sectional shape. Has a structure in which a rectangular waveguide is formed. In this box-shaped component, the waveguides at both ends in the longitudinal direction of the waveguide (for example, the left end and the right end in FIG. 3A) are obliquely cut, and the bottom surface ( For example, a waveguide port is formed in the lower surface of the drawing in FIG. 3B, and the waveguide is formed between the substrate 11 and the substrate 11 (for example, the lower direction in the drawing of FIG. 3B). It has a structure in which electromagnetic waves are input and output through the mouth.

Further, inside each of the conductor cases 12a and 12b (corresponding to the inside of the waveguide in this example), when the two conductor cases 12a and 12b are joined to face each other, for example, a conventional TE _A plurality of partition plates 13 are formed so as to realize the same arrangement as that of the _10- mode waveguide filter.
The interiors of 2a and 12b are hollow.

More specifically, in this example, two waveguides having a shape protruding inward from two side surfaces of the waveguide parallel to the substrate surface in four cross sections perpendicular to the longitudinal direction of the waveguide. Square partition plate 13 (each conductor case 13a, 13b
In this case, the partition plate 13 is divided into two equal parts), and is set up on the inner wall surfaces of the conductor cases 13a and 13b. That is,
Taking FIG. 3 (b) as an example, in each section, FIG.
There are provided two partition plates, a partition plate protruding downward from the upper surface and a partition plate protruding upward from the lower surface, and the diaphragm in the vertical direction by the partition plate is provided. The larger the area, the smaller the area of the cross section through which the wave can pass.

In the waveguide filter of this embodiment, the interior of the waveguide is partitioned by the partition plate 13 as described above, so that a space serving as a resonator is realized between adjacent sections in which the partition plate 13 is formed. Resonates the passing wave and makes the partition plate 13
By providing a window (inductive window) by opening a part of the cross section instead of completely closing the cross section, the resonator space is coupled (inductive coupling) to realize a function as a filter. ing.

As described above, the conductor cases 2a, 2a, 2
b denotes two input / output opening surfaces of the waveguide (2
(Opening surfaces of two waveguide ports) are formed, and a box-shaped component part in which the waveguide and the partition 13 are formed is divided so that all the partition plates 13 are exposed.
As described above, in each of the conductor cases 12a and 12b of this example, all the partition plates 13 are outside (the conductor cases 12a and 12b of each other).
Since the structure is exposed on the (12b side), it can be easily performed by mechanically performing, for example, a metal mold or the like that is molded into a mold or a cutting process that is performed by cutting or shaving a rectangular parallelepiped metal or the like. It is possible to manufacture.

The substrate 11 is formed of, for example, a multilayer substrate using a dielectric. In this example, the substrate 11 has the same shape as the bottom surface of the box-shaped component formed by combining the two conductor cases 12a and 12b. It is a component having a (rectangular) surface. In this example, the bottom surface of the box-shaped component and the surface of the substrate 11 correspond to the E surface, and a partition plate 13 for narrowing the cross section of the waveguide in a direction perpendicular to the E surface is provided. I have.

As shown in FIG. 3A, FIG. 4A and FIG. 4B, both ends of the substrate 11 in the longitudinal direction (for example, in FIG. Near the right end) and at a position R facing the two input / output opening surfaces of the waveguide (the opening surfaces of the two waveguide openings), a surface R facing the two conductor cases 12a and 12b is provided. An input / output end with the outside of the filter is formed using a conductor.

More specifically, the input / output terminal of this embodiment is connected to the substrate 11
The input / output slot 14 made of a conductor pattern formed at the above-mentioned position R inward from both ends (for example, in FIG. 3A, from the left end to the right or from the right end to the left). And the input / output slot 14
In the lower substrate 11 (layer inside the substrate 11)
From the surface direction to the other H surface direction (for example, FIG.
3A, the conductor pattern 15 is formed from the upper surface to the lower side or from the lower surface to the upper side.

As described above, in the waveguide filter of this embodiment,
The input / output slots 14 are formed by the triplate lines formed in the inner layer of the substrate 11 as shown in FIG.
An electromagnetic wave is input / output to / from the outside of the filter via the filter.
Note that the input / output slot 14 of this example has an elongated rectangular shape, and if the bend of the waveguide is straightened, the diaphragm direction of the partition plate 13 and the longitudinal direction of the rectangle are in the same direction. It is arranged to become.

A through-hole 16 is formed at each input / output end of the substrate 11 at a position in contact with the above-described conductor pattern 15, and the through-hole 16 is used to connect the conductor pattern 15 to another device outside the filter. It has a structure that can be connected to a conductor formed in the same.

As described above, the waveguide filter of this embodiment is
The two conductor cases 12a, 1
2b are faced to each other and joined using, for example, soldering or a conductive adhesive, and a box-shaped component portion formed by joining these two conductor cases 12a and 12b, an input / output slot 14 and the like are provided. It is configured by joining a substrate 11 having an input / output end to the outside of the waveguide filter. Here, the substrate 11 and the conductor case 12
a, 12b, for example, as shown in FIG.
As shown in (2), the surface on which the input / output end of the substrate 11 is formed is opposed to the bottom surface of the box-shaped component.

In the waveguide filter of the present embodiment, for example, when an electric signal is applied from the outside of the filter to the triplate line of one inner layer, the electric signal is electromagnetically connected to the triplate line. From the input / output slot 14 to the space in the waveguide as an electromagnetic wave, the electromagnetic wave is excited into the waveguide, and the electromagnetic wave arrives at the opposite input / output slot 14 and is When the electromagnetic wave is received, the electromagnetic wave is output to the outside of the filter as an electric signal from a triplate line electromagnetically connected (opposite side) to the input / output slot 14 so as to be output to the outside of the filter. Progresses. At this time, in the waveguide filter of this example, since the partition plate 13 is formed inside the waveguide, filtering according to the arrangement of the partition plate 13 is performed on the electromagnetic waves passing through the inside of the waveguide. You.

[0055] The above-described in the waveguide filter of this embodiment having the structure, for example, the internal structure of the waveguide similar to the waveguide filter has the same structure as the waveguide filter of TE ₁₀ mode It can demonstrate the filter function,
The input / output end (triplate line) on the substrate 11 using the input / output slot 14 can be directly connected to, for example, a strip line or the like, so that the converter as shown in the above-described conventional example is not used. In both cases, surface mounting can be easily performed.

Therefore, in the waveguide filter of this embodiment, all the partition plates 13 are exposed to the outside before the combination of the substrate 11 and the two conductor cases 12a and 12b as described above. It is very easy to form the partition plate 13 inside the waveguide as compared with the related art, whereby the manufacture becomes very easy, and for example, the number of manufacturing steps and the number of assembling steps can be reduced. At the same time, in the waveguide filter of the present example, since the component part composed of the two conductor cases 12a and 12b is box-shaped, the connection between the component part and the substrate 11 is easy, and Since the input / output terminals 11 are formed using conductors, the connection with other devices having input / output terminals using conductors, for example, becomes very easy.

Specifically, in the waveguide filter of this embodiment,
For example, it is possible to directly connect to a conductor outside the filter without employing the connection configuration using a flange as shown in the above conventional example, so that a waveguide filter with a small connection portion is realized. can do. Further, in the waveguide filter of this example, it is possible to directly use a connection method such as wire bonding used for a circuit that handles a microwave band or a millimeter wave band, for example, as described in the above-described conventional example. Since a simple converter is not required, cost reduction and the like can be realized.

In this embodiment, as a preferred embodiment, the components other than the substrate 11 (the above-described box-shaped components) are two.
Although the configuration is made up of the two conductor cases 12a and 12b, it is also possible to divide the component into three or more parts whose partitions are exposed. Further, for example, the box-like shape of the above-described components, the shape of the waveguide, the direction of the diaphragm, the input / output end formed on the substrate 11, the substrate 11 and the conductor case 1
Various methods may be used as a method of joining with 2a and 12b.

For example, in this embodiment, a multi-layer board is used as the board 11, and the input / output slot 14 is provided on the surface of the board 11.
Although the case where the input / output terminals are provided by forming the above-mentioned elements and the like has been described, other substrates and other input / output terminals may be used. As an example, it is also possible to configure the substrate from a double-sided substrate and form an input / output end by forming an open stub made of a conductor pattern such as a rectangle on the surface of the substrate. When an electric signal is applied to the open stub, an electromagnetic wave is excited in the waveguide in the metal case.

Further, in this embodiment, the side surface parallel to the E-plane of the waveguide filter is constituted by the substrate 11, but the side surface parallel to the H-plane is constituted by the substrate, and the input / output It is also possible to form edges. Further, in this example, the case where the function of the filter is realized using the partition plate has been described. However, the function of the filter can be realized using, for example, the pillars shown in FIG.

Here, the configuration of the waveguide filter according to the present invention is not necessarily limited to the one described above, and various configurations may be used. As an example,
Although the case where the function of the filter is realized using only one of the partition plate and the column has been described, for example, a configuration in which both the partition plate and the column are formed inside the waveguide may be used, In this case, if the waveguide filter is made up of components that expose all the partition plates and all the columns, the manufacture of each component becomes easy.

The first embodiment shows a case where the input / output pins are arranged in such a manner that the drawing direction of the partition plate and the axial direction of the input / output pins are orthogonal to each other, whereas the second embodiment shows a case where the drawing direction of the partition plate is reduced. Although the case where the input / output slots are arranged in correspondence with the direction and the longitudinal direction of the input / output slots has been described, for example, by changing the arrangement of the input / output pins and the input / output slots, etc. It is also possible to make the input / output characteristics of the electromagnetic wave different from the characteristic window. In addition, the input / output terminals to / from the outside of the filter using the conductor are not necessarily limited to those described above, and input / output terminals having other configurations can be formed.

The waveguide filter according to the present invention is suitable for application to, for example, a wireless communication device handling a microwave band or a millimeter wave band, but the field of application of the present invention is not particularly limited. However, the present invention can be applied to various devices.

[0064]

As described above, according to the waveguide filter of the present invention, a box having a surface parallel to the traveling direction of a wave is opened and a partition in a diaphragm direction parallel to the surface is formed inside. Since the mold part and the substrate on which the input and output ends with the outside of the filter are formed using conductors are joined together, all partitions of the part are exposed to the outside. This is very easy, and since the input / output terminals using conductors are formed on the substrate, it is very easy to connect to other devices or the like having the input / output terminals using conductors, for example.

Further, according to the waveguide filter of the present invention, the input / output opening surface of the waveguide is formed on the bottom surface, and the box-shaped component part in which the waveguide and the partition are formed is partitioned. A plurality of parts having a shape divided so as to be exposed, and a substrate having an input / output end with the outside of the filter formed by using a conductor at a position corresponding to the input / output opening surface, so that the plurality of parts are joined. It is very easy to fabricate a waveguide filter because all the partitions are exposed to the outside of the component, and the above-mentioned components are box-shaped and the components are easily joined to the substrate. At the same time, since input / output terminals using conductors are formed on the substrate, connection to other devices having input / output terminals using conductors, for example, becomes very easy.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a waveguide filter according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a waveguide filter according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating an example of a waveguide filter according to a second embodiment of the present invention.

FIG. 4 is a diagram illustrating an example of a waveguide filter according to a second embodiment of the present invention.

FIG. 5 is a diagram illustrating an example of a waveguide filter according to a conventional example.

FIG. 6 is a diagram illustrating an example of a waveguide filter according to a conventional example.

FIG. 7 is a diagram illustrating an example of a waveguide filter according to a conventional example.

[Explanation of symbols]

1, 11 ... board, 2, 12a, 12b ... conductor case, 3, 13 ... partition plate, 4 ... input / output pattern,
5 ground pattern, 6 input / output pins, P
I / O pin installation position, Q: gap, 14: input / output slot, 15: conductor pattern, 16: through hole,

Claims (2)

[Claims] 1. A waveguide filter in which a partition is formed inside a waveguide for narrowing a cross section perpendicular to the direction of travel of a wave, wherein a surface parallel to the direction of travel of the wave is open and parallel to the surface. A box-shaped component having a partition in the direction of the narrow aperture and a substrate on which input / output terminals to the outside of the filter are formed using conductors are prepared separately, and the opening surface of the component and the input / output end of the substrate are separated. A waveguide filter, wherein the component and the substrate are joined so that the formed surface is opposed to the component. 2. A waveguide filter in which a partition for narrowing a cross section perpendicular to the direction of propagation of a wave is formed inside a waveguide, wherein an input / output opening surface of the waveguide is formed on a bottom surface and the waveguide is formed inside the waveguide. A plurality of parts each having a shape obtained by dividing a box-shaped component part in which a pipe and a partition are formed so that the partition is exposed, and an input / output terminal to / from the outside of the filter using a conductor at a position corresponding to the input / output opening surface Are prepared separately from each other, and the component part is configured such that the bottom surface of the component part configured by joining the plurality of components faces the surface on which the input / output end of the substrate is formed. A waveguide filter, wherein the waveguide filter and the substrate are joined.