JP2018011256A - Dielectric waveguide type resonant component and its characteristic adjusting method - Google Patents

Abstract

In a dielectric waveguide type resonant component, even if a slight dimensional deviation occurs in components such as a dielectric block, a conductor film, and a conductive plate in the manufacturing process, the resonant frequency can be finely adjusted. Improve product yield.
A first surface and a second surface positioned on opposite sides of each other, and a plurality of side wall surfaces positioned between an outer peripheral edge of the first surface and an outer peripheral edge of the second surface A dielectric block having a concave portion provided on the first surface, a conductor film formed on an outer surface of the dielectric block excluding the concave portion, and at least an opening surface of the concave portion and an edge thereof. And a conductive plate electrically connected to the conductive film, and a characteristic adjusting screw that penetrates the conductive plate and has a tip inserted while maintaining a gap in the concave portion.
[Selection] Figure 3

Description

  The present invention relates to a dielectric waveguide type resonant component, and more particularly to a dielectric waveguide type resonant component suitable for use in a microwave band or a millimeter wave band.

  As a dielectric resonant component used in a mobile communication device such as a cellular phone, a dielectric resonant component in a TEM mode using a dielectric block as shown in FIG. 1 and having an outer conductor on the outside and an inner conductor on the inside is used. Often used.

In FIG. 1, a substantially hexahedron-shaped dielectric block 901 having a length L, a width W, and a height H includes a first surface 903 and a second surface 905 facing each other, and each direction connected to these two surfaces. And four side wall surfaces 907. The dielectric block 901 is formed with a through hole 907 that penetrates the inside from the first surface 903 to the second surface 905. An inner conductor is attached to the inner wall surface 909 of the through hole 907, and outer conductors are attached to the outer surface (five surfaces in total) of the dielectric block 901 excluding the first surface 903. Thus, a 1/4 wavelength type resonance component 900 is formed corresponding to the through hole 907. A frequency adjustment electrode 911 connected to the inner conductor is formed on the first surface 903. Such a dielectric resonant component has an L dimension corresponding to a quarter wavelength in the relative permittivity ε _r of the block, and can set the resonant frequency relatively easily. Further, the resonant frequency can be obtained by scraping the frequency adjusting electrode 911. Can be finely adjusted. However, in the dielectric resonant component having such a structure, in order to obtain a high unloaded Q value, it is necessary to increase the open end cross-sectional area (WxH), but the L dimension is the relative dielectric constant ε _{r of the} dielectric material. Therefore, when the resonance frequency is high, the L dimension is shortened and the shape is unbalanced. Further, since the resonance frequency of the higher-order resonance mode is close to the resonance frequency of the TEM mode to be used, there is a limit to improving the no-load Q value.

On the other hand, a waveguide-type dielectric resonant component is known in which an outer conductor is formed on the outer surface of a dielectric block. FIG. 2 is a schematic perspective view of a TE101 mode dielectric waveguide type resonant component 920. The direction of the electric field in the dielectric block (WxHxL) is indicated by an arrow, the electric field direction is parallel to the L direction, and the electric field strength is maximum at the center of WxH. The wavelength λ _g inside the resonance component 920 is λ _g = 2WH / √ (W ² + H ² ), and the resonance frequency is determined by the dimensions of W and H. Such a dielectric waveguide type resonant component 920 is larger in size than a TEM mode dielectric resonant component having the same resonance frequency when a material having the same relative dielectric constant is used, and obtains a high unloaded Q. Can do. However, since the resonance frequency is determined only by the dimensions of W and H, the processing dimensions of the dielectric block must be strictly controlled. In addition, there is a problem in cost because it is necessary to prepare a mold for each frequency. Further, since there is no frequency adjustment electrode unlike the TEM mode dielectric resonance component 900, there is a problem that the resonance frequency cannot be finely adjusted and the yield is lowered.

  In order to solve such a problem, Patent Document 1 discloses a method in which a recess without an electrode is provided on the WxH plane so that various frequencies can be set even with the same dielectric block size. As shown in FIG. 3 and FIG. 5 of this document, Patent Document 1 provides a resonant frequency by providing a through hole or a depression without a conductor film in a dielectric block and setting its shape and depth. Even if the outer shape of the dielectric block is the same, a desired resonance frequency is obtained. However, in Patent Document 1, the hole diameter and the shape of the dent are determined by a mold or the like, and if a slight dimensional deviation occurs in the manufacturing process, fine adjustment cannot be performed later. Therefore, there is a problem of deteriorating product yield.

JP-A-10-93311

  An object of the present invention is to finely adjust a resonance frequency in a dielectric waveguide type resonance component even if a slight dimensional deviation occurs in components such as a dielectric block, a conductor film, and a conductive plate in the manufacturing process. This is to improve the product yield.

According to the present invention, the object as described above is achieved.
A first surface and a second surface located on opposite sides of each other; a plurality of side wall surfaces located between an outer peripheral edge of the first surface and an outer peripheral edge of the second surface; A dielectric block having a recess provided on the surface of
A conductor film formed on the outer surface excluding the concave portion of the dielectric block;
A conductive plate that covers at least the opening surface of the recess and its edge, and is electrically joined to the conductor film;
A characteristic adjusting screw that penetrates the conductive plate and is inserted while maintaining a gap in the recess at the tip;
A dielectric waveguide type resonant component is provided.
Moreover, according to the present invention,
A dielectric waveguide type resonant component comprising a plurality of dielectric waveguide type resonators coupled to each other,
Each dielectric waveguide resonator includes a first surface and a second surface located on opposite sides of each other, and an outer peripheral edge of the first surface and an outer peripheral edge of the second surface. A dielectric block having a plurality of side wall surfaces positioned and a recess provided in the first surface;
An additional recess provided at a boundary between adjacent dielectric waveguide resonators on the first surface;
A depression provided on a side wall surface at a boundary between dielectric waveguide resonators adjacent to each other;
A conductor film formed on the outer surface excluding the recess and the additional recess;
Covering at least the opening surface of the concave portion and its peripheral portion and the opening surface of the additional concave portion and its peripheral portion, straddling a plurality of dielectric waveguide resonators, and being electrically connected to the conductor film A conductive plate;
A characteristic adjusting screw that penetrates the conductive plate so that the tip is inserted in the recess while maintaining a gap;
An additional characteristic adjusting screw that penetrates the conductive plate so that the tip is inserted into the additional recess while maintaining a gap;
A pair of input / output electrodes respectively provided in the dielectric waveguide resonators at both ends;
A dielectric waveguide type resonance component is provided.

  According to the present invention, even if a slight dimensional deviation occurs in components such as a dielectric block, a conductor film, and a conductive plate during the manufacturing process, the resonance frequency is finely adjusted by adjusting the insertion amount of the characteristic adjusting screw. Thus improving product yield.

It is a typical perspective view which shows the dielectric resonance component of the TEM mode by a prior art example. It is a typical perspective view of the dielectric waveguide type resonance component of TE101 mode by a prior art example. 1 is a schematic perspective view showing a dielectric waveguide resonator according to a first embodiment of the present invention. 1 is a schematic exploded perspective view showing a dielectric waveguide resonator according to a first embodiment of the present invention. VV ′ of FIG. 3 in the dielectric waveguide resonator according to the first embodiment of the present embodiment and V of FIG. 6 in the dielectric waveguide resonator according to the second embodiment of the present embodiment. FIG. It is a typical perspective view of the upper surface side which shows the dielectric waveguide filter which is a dielectric waveguide type resonance component by the 2nd Embodiment of this invention. It is a typical perspective view by the side of the bottom which shows the dielectric waveguide filter which is a dielectric waveguide type resonance component by the 2nd Embodiment of this invention. It is a typical exploded perspective view showing a dielectric waveguide filter which is a dielectric waveguide type resonance component according to a second embodiment of the present invention. FIG. 7 is a partial sectional view taken along line IX-IX ′ of FIG. 6 in a dielectric waveguide resonator according to a second embodiment of the present embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 3 is a schematic perspective view showing a dielectric waveguide resonator according to the first embodiment of the present invention. FIG. 4 is a schematic exploded perspective view showing the dielectric waveguide resonator according to the first embodiment of the present invention.
The dielectric waveguide type resonance component 101 includes a dielectric block 103, a conductive plate 105, and a characteristic adjusting screw 107. As a material of the dielectric block 103, for example, a forsterite ceramic mainly composed of Mg ₂ SiO ₄ and a dielectric ceramic having a relative dielectric constant ε _r of about 10 can be used.

  The dielectric block 103 has a substantially rectangular parallelepiped basic shape having a length L, a width W, and a height H. The length L is, for example, about 10 mm, the width W is, for example, about 18 mm, and the height H is, for example, about 19.5 mm. The dielectric block 103 includes a first surface 109 and a second surface 111 that are opposite to each other with a length L, an outer periphery of the first surface 109, and an outer periphery of the second surface 111. And a plurality of side wall surfaces 113 located between them.

  As shown in FIGS. 4 and 5, the dielectric block 103 has a concave portion 115 formed at substantially the center of the first surface 109. The shape of the recess 115 is, for example, a cylindrical shape having a diameter of about 4 mm and a depth of about 3.5 mm. The outer surface of the dielectric block 103, that is, the first surface 109, the second surface 111, and the side wall surface 113 is provided with a conductor film 117 except for the recess 115. As a material of the conductor film 117, for example, silver is used.

  The conductive plate 105 is electrically bonded to the first surface 109 of the dielectric block 103 by a bonding member such as solder. The material of the conductive plate 105 is preferably a material having a thermal expansion coefficient close to that of the dielectric block 103. For example, iron-based metal, particularly iron whose surface is tin-plated can be used. The conductive plate 105 is provided with a screw hole 119 corresponding to the concave portion 115 of the dielectric block 103, and a characteristic adjusting screw 107, which is a male screw, is screwed into the conductive plate 105. The joining member of the conductive plate 105 is not limited to solder, and may be a conductive adhesive or solder.

  As the characteristic adjusting screw 107, for example, a screw having a diameter of 3 mm is used, and the material is, for example, an iron-based material having conductivity. In particular, the surface is chromated or silver plated.

  FIG. 5 is a partial cross-sectional view taken along the line V-V ′ of FIG. 3 in the present embodiment. The characteristic adjusting screw 107 is made of metal having conductivity, and protrudes and is screwed to the back side of the conductive plate 105, that is, the first surface 109 side of the dielectric block 103, and a predetermined gap 121 is formed in the recess 115. It is inserted apart.

Thus, in the present embodiment, a TE101 mode dielectric waveguide type resonant component is configured.
In the present embodiment, when the conductive characteristic adjusting screw 107 is inserted into the recess 115 of the dielectric waveguide type resonance component 101, the insertion portion acts as a perturbation on the electric field, and the resonance frequency is lowered. Further, since the amount of perturbation changes depending on the insertion depth of the characteristic adjusting screw 107, the resonance frequency can be finely adjusted with respect to the insertion depth.

  In the case of the TE101 mode waveguide type resonance component 101, the position where the electric field is strongest is the central portion of the first surface 109, and the resonance frequency can be adjusted in a wider range by setting the characteristic adjusting screw 107 at this position. be able to.

  Table 1 shows the relationship between the insertion depth of the characteristic adjusting screw 107 and the resonance frequency of the dielectric waveguide type resonance component in the present embodiment. Here, the screw insertion amount means a portion protruding from the conductive plate to the back surface. From Table 1, the resonance frequency can be lowered by increasing the insertion amount, and the 43 MHz resonance frequency can be reduced by changing the insertion amount from 1 mm to 3 mm. Therefore, it is possible to provide a low-frequency resonant component without increasing the size.

  The characteristic adjusting screw can be fixed to the conductive plate by using a fixing nut (not shown). The fixing nut is screwed into the characteristic adjusting screw in advance, and is tightened so as to fix the characteristic adjusting screw to the conductive plate after the characteristic adjustment. Moreover, the characteristic adjustment screw 107 can fix the screw part with a joining member. Examples of the joining member include solder, epoxy adhesive, silicone adhesive, anaerobic adhesive, and thermosetting resin. By using the bonding agent, the bonding between the tapping screw and the conductive plate 105 becomes stronger and the screw is less likely to loosen. Furthermore, a fixing nut and a joining member can be used in combination.

  Further, as the characteristic adjusting screw 107, a tapping screw can be used. In this case, a pilot hole suitable for inserting a tapping screw is formed in the conductive plate 105 in advance. Since the tapping screw is screwed in while forming the female screw itself, it is not necessary to form the female screw in advance in the conductive plate 105. Further, since the female screw is formed by being gradually expanded, it has a minimum size, and there is almost no play between the male screw and the female screw, and the female screw can be fixed at a predetermined screwing position. Therefore, since it is not necessary to provide a fixing nut, the number of members can be reduced, and the number of steps for fixing the screw can be reduced.

  6 and 7 are schematic perspective views showing a dielectric waveguide resonator according to the second embodiment of the present invention. FIG. 8 is a schematic exploded perspective view showing a dielectric waveguide resonator according to the second embodiment of the present invention. The dielectric waveguide type resonant component 201 according to the second embodiment of the present invention is roughly a dielectric waveguide used in the dielectric waveguide type resonant component 101 according to the first embodiment. This is a combination of three dielectric waveguide resonators 201-1, 201-2, 201-3 similar to a tube resonator, and is used as a dielectric waveguide filter.

  As in the first embodiment, the dielectric block 203 includes a first surface 209 and a second surface 211 that are opposite to each other across the length L, the outer peripheral edge of the first surface 209, and the first surface. And a plurality of side wall surfaces 213 located between the outer peripheral edges of the two surfaces 211. The dielectric block 203 has a substantially rectangular parallelepiped basic shape having a length L, a width W, and a height H. The length L is, for example, about 10 mm, the width W is, for example, about 59 mm, and the height H is, for example, about 19.5 mm.

As a material of the dielectric block 203, for example, a forsterite ceramic mainly composed of Mg ₂ SiO ₄ and a dielectric ceramic having a relative dielectric constant ε _r of about 10 can be used.

  The dielectric block 203 has a recess 231 formed on the side wall surface 213 from the first surface 209 to the second surface 211 so as to constitute three resonators 201-1, 201-2, 201-3 therein. The coupling between the resonators can be adjusted by the size of the recess 231. The size of the recess 231 is, for example, a width of 3 mm, a depth of 6.5 mm, and a length of 10 mm.

  The first surface 209 of the dielectric block 203 is a partition in which a recess 215 forms a recess 231 at the center of each of the resonators 201-1, 201-2, 201-3 when viewed in the longitudinal direction. Additional recesses 233 (5 recesses in total) are formed in each of the parts. A conductor film 217 is formed on the outer surface of the dielectric block 203 other than the recess 215 and the additional recess 233. A section V-V ′ passing through the recess 215 is shown in FIG. 5. A section IV-IV 'passing through the additional recess 233 is shown in FIG. A pair of tongue-shaped input / output electrodes 230 are formed on the second surface 211, and these input / output electrodes 230 are coupled to the resonators 201-1 and 201-3 at both ends. These input / output electrodes 230 are connected to an external circuit (not shown), and exchange signals with the external circuit.

  The conductive plate 205 is electrically bonded to the upper surface of the first surface 209 of the dielectric block 203. For example, the conductive plate 205 is bonded to the upper surface of the first surface 209 with solder. The conductive plate 205 is provided with three screw holes 219 and two screw holes 235 (five screw holes in total) corresponding to the three recesses 215 and the two additional recesses 233 of the dielectric block 203, respectively. Each of the screw holes 219 is screwed with a characteristic adjusting screw 207, and each of the screw holes 235 is screwed with an additional characteristic adjusting screw 237 (a total of five characteristic adjusting screws). Thus, in this embodiment, a TE101 mode three-stage dielectric waveguide bandpass filter is configured.

  The characteristic adjusting screw 207 is made of metal having conductivity, and protrudes and is screwed to the back side of the conductive plate 205, that is, the first surface 209 side of the dielectric block 203, and a predetermined gap 221 is formed in the recess 215. It is inserted apart.

  Similarly, the additional characteristic adjusting screw 237 is made of a metal having conductivity, and protrudes and is screwed to the back side of the conductive plate 205, that is, the first surface 209 side of the dielectric block 203. A predetermined gap 221 is inserted into 233.

  The resonance frequency can be adjusted by adjusting the insertion depth of the three characteristic adjustment screws 207 located at the center of the resonators 201-1, 201-2, and 201-3 when viewed in the longitudinal direction. The coupling between the resonators 201-1, 201-2, and 201-3 can be adjusted by adjusting the insertion depth of the two additional characteristic adjusting screws 237 located in the portion 231.

  According to the present embodiment, the resonance frequency can be adjusted with the characteristic adjusting screw 207 even if there is some dimensional variation in manufacturing, and the coupling between resonators can be adjusted with the additional characteristic adjusting screw 237. A dielectric waveguide filter having a high yield can be provided.

  In Patent Document 1, it is not considered at all to adjust a frequency or a coupling amount by inserting a conductor into a hole, and such a structure is not suggested. The resonance frequency is only set according to the size and position of the recess. In Patent Document 1, the resonance frequency increases by making a hole. Therefore, in order to obtain the target frequency, the size must be increased. I must. On the other hand, according to the present embodiment, the frequency can be lowered by inserting the characteristic adjusting screw, and a predetermined frequency can be obtained even if the resonant component size is small. In addition, because of the screw structure, the characteristics can be finely adjusted.

  Note that the number of resonators is not limited to three. The shape of the recess is not limited to a cylindrical shape as long as the screw can be inserted.

  INDUSTRIAL APPLICABILITY The present invention can be suitably applied as a resonant component to mobile communication devices such as base station applications that require high performance.

DESCRIPTION OF SYMBOLS 101 Dielectric waveguide type resonance component 103 Dielectric block 105 Conductive plate 107 Characteristic adjustment screw 109 1st surface 111 2nd surface 113 Side wall surface 115 Recessed part 117 Conductive film 119 Screw hole 121 Air gap 201 Dielectric waveguide type Resonant component (dielectric waveguide filter)
201-1, 201-2, 201-3 Dielectric waveguide resonator 203 Dielectric block 205 Conductive plate 207 Characteristic adjusting screw 209 First surface 211 Second surface 213 Side wall surface 215 Recessed portion 217 Conductive film 219, 235 Screw hole 221 Air gap 230 Input / output electrode 231 Recess 233 Additional recess 237 Additional characteristic adjustment screw

Claims (10)

A first surface and a second surface located on opposite sides of each other; a plurality of side wall surfaces located between an outer peripheral edge of the first surface and an outer peripheral edge of the second surface; A dielectric block having a recess provided on the surface of
A conductor film formed on the outer surface excluding the concave portion of the dielectric block;
A conductive plate that covers at least the opening surface of the recess and its edge, and is electrically joined to the conductor film;
A characteristic adjusting screw that penetrates the conductive plate and is inserted while maintaining a gap in the recess at the tip;
A dielectric waveguide type resonance component comprising:   2. The dielectric waveguide resonator according to claim 1, wherein an insertion amount of at least one of the characteristic adjusting screws is adjustable.   3. The dielectric waveguide resonator component according to claim 1, wherein at least one of the characteristic adjusting screws is a male screw that is screwed into a screw hole formed in the conductive plate.   The at least one of the characteristic adjusting screws is a tapping screw that is screwed into the conductive plate when fitted to a pilot hole formed in the conductive plate. The dielectric waveguide type resonant component described. A dielectric waveguide type resonant component comprising a plurality of dielectric waveguide type resonators coupled to each other,
Each dielectric waveguide resonator includes a first surface and a second surface located on opposite sides of each other, and an outer peripheral edge of the first surface and an outer peripheral edge of the second surface. A dielectric block having a plurality of side wall surfaces positioned and a recess provided in the first surface;
An additional recess provided at a boundary between adjacent dielectric waveguide resonators on the first surface;
A depression provided on a side wall surface at a boundary between dielectric waveguide resonators adjacent to each other;
A conductor film formed on the outer surface excluding the recess and the additional recess;
Covering at least the opening surface of the concave portion and its peripheral portion and the opening surface of the additional concave portion and its peripheral portion, straddling a plurality of dielectric waveguide resonators, and being electrically connected to the conductor film A conductive plate;
A characteristic adjusting screw that penetrates the conductive plate so that the tip is inserted in the recess while maintaining a gap;
An additional characteristic adjusting screw that penetrates the conductive plate so that the tip is inserted into the additional recess while maintaining a gap;
A pair of input / output electrodes respectively provided in the dielectric waveguide resonators at both ends;
The dielectric waveguide type resonance component further comprising:   6. The dielectric waveguide resonator according to claim 5, wherein an insertion amount of at least one of the characteristic adjusting screw and the additional characteristic adjusting screw is adjustable.   7. The dielectric waveguide according to claim 5, wherein at least one of the characteristic adjusting screw and the additional characteristic adjusting screw is a male screw that is screwed into a screw hole formed in the conductive plate. Tube-type resonant component.   At least one of the characteristic adjustment screw and the additional characteristic adjustment screw is a tapping screw that is screwed into the conductive plate when fitted to a pilot hole formed in the conductive plate. The dielectric waveguide resonator component according to claim 5 or 6.   5. A characteristic adjusting method, wherein the characteristic of the dielectric waveguide type resonance component according to claim 1 is adjusted by at least one of insertion amounts of the characteristic adjusting screw.   The characteristic of the dielectric waveguide resonator according to any one of claims 5 to 8, wherein the characteristic is adjusted by at least one of an insertion amount of the characteristic adjusting screw and the additional characteristic adjusting screw. Characteristic characteristic adjustment method.

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