JP2008199113A - Microstrip antenna and microstrip antenna assembly - Google Patents

Abstract

A microstrip antenna assembly that can function as a broadband antenna even with a single microstrip antenna, and that has a plurality of these microstrip antennas arranged side by side to improve performance and practicality. To get.
A microstrip antenna (10) is provided with a box-shaped conductor plate (11) formed in a bottomed cylindrical shape and a substantially spaced distance (d) from the bottom surface (11a) of the box-shaped conductor plate (11) so as to be substantially parallel to the bottom surface (11a). The radiation conductor plate 13, a pair of power supply conductor plates 14a that are conductively connected to two opposite sides of the radiation conductor plate 13 and extend toward the bottom surface 11a of the box-shaped conductor plate 11, and the pair And a power feed pin 15 that is electrically connected to the power feed conductor plate 14a and can feed power having a phase difference of 180 °.
[Selection] Figure 1

Description

  The present invention relates to a microstrip antenna and a microstrip antenna assembly having a wide band characteristic used as an element antenna constituting an array antenna.

  Conventionally, this type of microstrip antenna has been used as an array antenna, and due to the characteristics of its configuration, it was only compatible with narrowband antennas. Yes.

  For example, when this type of conventional microstrip antenna is fed from a feeding point to a radiating conductor plate and resonates in the TM110 mode, which is a fundamental mode for excitation, as shown in FIG. In some cases, a radiation field is obtained. (See Patent Document 1).

  FIG. 9 is a perspective view showing an outline of a conventional microstrip antenna (Patent Document 1).

  The conventional microstrip antenna 1 is fed to the radiating conductor plate 4 from an inner conductor 3 of a coaxial cable (not shown), which is a feeding point provided on the conductor plate 2 side. When the microstrip antenna 1 resonates in the TM110 mode, the wall surface 2a rising from both sides of the conductor plate 2 is provided, and the microstrip antenna 1 penetrates the conductor plate 2 from the lower side of the conductor plate 2 so as to penetrate the inner conductor 3 of the coaxial cable. Is configured to connect.

And, for example, as indicated by the dotted line b in FIG. 5, when the return axis is 0 to −20 (dB) and the horizontal axis is 2.0 to 5.0 (GHz), the frequency is around 4 GHz. Only a narrow band can be obtained with good characteristics. Further, there is (Non-patent document 1) as a patch antenna element having a broadband characteristic. According to this non-patent document 1, a range of angle-30 to +30 is partially shown as a dotted line a in FIG. Is good, but because the beam width is narrow, the angular response is not good.
JP-A-3-157005 Naftali Herscovici, “A Wide-Band Single-Layer Patch Antenna” IEEE, TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL.46, NO.4, APRIL 1998

  According to the conventional microstrip antenna 1, although it has been possible to use in a wide band to some extent, further improvement in performance and practicality has been demanded.

  The present invention has been made in view of the above circumstances, and a single microstrip antenna can function as a wideband antenna, and a plurality of these microstrip antennas are arranged side by side for more performance and practicality. It is an object of the present invention to obtain a microstrip antenna assembly with improved performance.

  In order to achieve the above object, according to the present invention, a box-shaped conductor plate formed in a bottomed cylindrical shape and a predetermined interval from the bottom surface of the box-shaped conductor plate are provided substantially parallel to the bottom surface. Provided is a microstrip antenna comprising a radiating conductor plate and a feeding pin electrically connected to the radiating conductor plate and capable of feeding power having a phase difference of 180 °.

  In order to achieve the above object, according to the present invention, a box-shaped conductor plate formed in a bottomed cylindrical shape and a predetermined interval from the bottom surface of the box-shaped conductor plate are provided substantially parallel to the bottom surface. A radiating conductor plate, a pair of feeding conductor plates electrically connected to two opposite sides of the radiating conductor plate, and extending toward the bottom surface of the radiating conductor plate; and the pair of feeding conductor plates Provided is a microstrip antenna characterized in that it includes power supply pins that are electrically conductively connected and can supply power with different phases of 180 °.

  To achieve the above object, according to the present invention, a plurality of microstrip antennas and a microstrip antenna support substrate that supports the plurality of microstrip antennas arranged in a grid pattern are provided, and the plurality of microstrip antennas are provided. The strip antenna includes a plane portion, a conductor plate having a wall surface provided to rise substantially perpendicularly from the plane portion, and a radiating conductor plate provided substantially parallel to the bottom surface at a predetermined interval from the bottom surface of the conductor plate. A pair of feeding conductor plates that are conductively connected to two opposite sides of the radiation conductor plate and extend toward the bottom surface of the box-shaped conductor plate; and conductively connected to the pair of feeding conductor plates And a pair of feed pins that can feed power having different phases by 180 °, and the microstrip antenna support substrate has the plurality of micros A microstrip antenna assembly characterized in that, when the lip antennas are arranged in a grid pattern, a part of the wall surface of each microstrip antenna can be shared with the wall surface of another microstrip antenna. I will provide a.

  ADVANTAGE OF THE INVENTION According to this invention, the microstrip antenna which can exhibit a function as a broadband antenna even with a microstrip antenna single-piece | unit can be provided.

  In addition, a plurality of microstrip antennas can be used in combination, and if one or more of them breaks down or breaks, there is no practical problem, and a microstrip antenna assembly with good manufacturability can be provided.

[First Embodiment]
An embodiment of a microstrip antenna according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing an outline of an embodiment of a microstrip antenna of the present invention. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG.

  A microstrip antenna 10 shown in FIG. 1 has a box-shaped conductor plate 11 formed in a bottomed cylindrical shape and a required distance d from the bottom surface 11a of the box-shaped conductor plate 11, and is parallel to the bottom surface 11a by a support rod 12. And a pair of feed conductor plates 14a that are conductively connected to two opposite sides of the radiation conductor plate 13 and extend toward the bottom surface 11a of the box-shaped conductor plate 11. And a feed pin 15 that is conductively connected to the pair of feed conductor plates 14a and can feed power having a phase difference of 180 °.

  The box-shaped conductor plate 11 has a square shape and rises substantially perpendicularly from the four-side peripheral portion of the bottom surface 11a to provide wall surfaces 11b1 to 11b4. The wall surfaces 11b1 to 11b4 may be joined with a frame of another piece on the bottom surface 11a, or the bottom surface 11a may be bent. Further, the corners of the wall surfaces 11b1 to 11b4 may be cut off.

  The support bar 12 mechanically supports the central portion of the radiating conductor plate 13 and may be insulative bar-shaped or plate-shaped.

  The radiating conductor plate 13 is a rectangular shape formed of, for example, a metal foil, and is provided with an interval of a desired dimension c as shown in FIG. 2 between the opposing wall surfaces 11b1 to 11b4. It is done. This desired dimension c is appropriately set according to the antenna characteristics in order to obtain a predetermined opening electric field emitted from the radiation conductor plate 13 side.

  The pair of power supply conductor plates 14 a are conductor plates that supply current to the radiation conductor plate 13, and are provided to be inclined obliquely downward toward the bottom surface 11 a of the box-shaped conductor plate 11. The pair of feed pins 15 are introduced from the bottom surface 11a side of the box-shaped conductor plate 11, and the central conductor line 15a is conductively connected to the pair of feed conductor plates 14a.

  The power supply pin 15 is used to supply power to the radiating conductor plate 13, but it is not always necessary to pass through the radiating conductor plate 13 and may be directly conducted. Further, a cable or a lead wire instead of the power supply pin 15 may be used for connection.

  Next, the operation of the microstrip antenna 10 will be described.

  When power is supplied from the central conductor line 15 a to the pair of power supply conductor plates 14 a, a predetermined opening electric field is emitted from the radiation conductor plate 13 side toward the bottom surface 11 a of the box-type conductor plate 11. Since the opening electric field to be emitted can select a spatial distance of a desired dimension c between the wall surfaces 11b1 to 11b4, a required strong electric field can be obtained.

  Therefore, for example, as shown by the solid line e in FIG. 4, Angle [deg] can be transmitted and received with high gain in the range of −45 to +45. For example, as shown by a solid line f in FIG. 5, Frequency [GHz] is obtained in the range of 2.5 to 5.0 without a low litter loss characteristic.

  Furthermore, the microstrip antenna 10A can be shaped as shown in FIG. This microstrip antenna 10A can also be provided with another pair of feeding conductor plates 14b in different directions.

When the microstrip antenna having such a configuration is employed, the case where the polarization plane of the radio wave transmitted and received by the microstrip antenna 10A is different, for example, even when the plane of polarization of the radio wave is orthogonal can be dealt with.

  It should be noted that the joint dimensions of the wall surfaces 11b1 to 11b4 of the box-shaped conductor plate 11 can be removed or made unnecessary, thereby facilitating installation size accuracy management of this portion. That is, the entire dimensional accuracy can be easily obtained as compared with the case where the entire wall surfaces 11b1 to 11b4 are integrally joined.

[Second Embodiment]
Next, a microstrip antenna assembly 20 using a plurality of microstrip antennas 10B as a second embodiment will be described with reference to FIGS. 7 and 8 in which the same reference numerals are attached to the same parts as FIGS. .

  FIG. 7 is a perspective view showing an outline of an embodiment of the microstrip antenna assembly 20 of the present invention. 8 is a cross-sectional view taken along the line CC of FIG.

  The microstrip antenna assembly 20 shown in FIGS. 7 and 8 includes a plurality of microstrip antennas 10B on a substrate surface 21a of a support substrate 21 made of a rectangular dielectric, for example, in a grid pattern in four rows and four rows. It is a side-by-side configuration.

  In the microstrip antenna assembly 20, for example, frame bodies 22 are provided around four sides outside the substrate surface 21a of a rectangular support substrate 21. A total of 16 microstrip antennas 10B are supported in a grid pattern inside the frame 22 on the upper surface 21a of the support substrate 21. In the plurality of microstrip antennas 10B, two adjacent wall surfaces 11b2 and 11b3 which are raised substantially at right angles are provided on the bottom surface 11a of each box-shaped conductor plate 11. These wall surfaces 11b2 and 11b3 are arranged so that their directions are aligned in the same direction as shown in FIG. 7, for example, as viewed from above.

  When the plurality of microstrip antennas 10B are supported on the microstrip antenna support plate in a plane in the vertical and horizontal directions, the wall surfaces 11b2 and 11b3 of the respective microstrip antennas are the wall surfaces of the other microstrip antennas 10B. It can be shared as other wall surfaces.

  The microstrip antenna assembly 20 adopting such a configuration can be used even if one or more of the 16 microstrip antennas 10B malfunction or are damaged due to their use. The microstrip antenna 10B operates normally.

  Thus, according to the microstrip antenna assembly 20, the plurality of microstrip antennas 10B are arranged in a grid pattern, so that the microstrip antenna assembly 20 can be used in a severe environment in terms of performance improvement and usage conditions. It is possible and extremely useful.

The perspective view which shows the outline | summary of the microstrip antenna which is the 1st Embodiment of this invention. Sectional drawing in alignment with the AA of FIG. Sectional drawing which follows the BB line of FIG. The graph which shows the azimuth angle characteristic of the microstrip antenna of this invention compared with the characteristic of the conventional antenna. The graph which shows the frequency characteristic of the microstrip antenna of this invention compared with the characteristic of the conventional antenna. The perspective view which shows the Example which provided the other pair of feed conductor board in a different direction with respect to a pair of feed conductor board of the microstrip antenna of this invention. The perspective view which shows the outline | summary of the microstrip antenna assembly which is the 2nd Embodiment of this invention. Sectional drawing which follows the CC line | wire of FIG. The perspective view which shows the outline | summary of the conventional microstrip antenna.

Explanation of symbols

10, 10A, 10B Microstrip antenna 11 Box-shaped conductor plate 11a Bottom surface 11b1 to 11b4 Wall surface 12 Support rod 13 Radiation conductor plates 14a and 14b Feed conductor plate 15 Feed pin 15a Center conductor wire 20 Microstrip antenna assembly 21 Support substrate 21a Substrate Surface 22 frame

Claims (6)

A box-shaped conductor plate formed in a bottomed cylindrical shape;
A required distance from the bottom surface of the box-shaped conductor plate, and a radiation conductor plate provided substantially parallel to the bottom surface,
A microstrip antenna comprising a feed pin electrically connected to the radiating conductor plate and capable of feeding power having a phase difference of 180 °. A box-shaped conductor plate formed in a bottomed cylindrical shape;
A required distance from the bottom surface of the box-shaped conductor plate, and a radiation conductor plate provided substantially parallel to the bottom surface,
A pair of feeding conductor plates that are conductively connected to two opposite sides of the radiation conductor plate and are provided to extend toward the bottom surface of the radiation conductor plate;
A microstrip antenna comprising a power feed pin that is conductively connected to the pair of power feed conductor plates and capable of feeding power having a phase difference of 180 °. 3. The radiation conductor plate is provided with a pair of feed conductor plates on two opposite sides in addition to a pair of feed conductor plates provided on two opposite sides. Microstrip antenna. 3. The microstrip antenna according to claim 2, wherein the box-shaped conductor plate formed in the bottomed cylindrical shape has a polygonal shape, and corners thereof are cut off. A plurality of microstrip antennas, and a microstrip antenna support substrate that supports the plurality of microstrip antennas arranged in a grid pattern;
The plurality of microstrip antennas include a plane part and a conductor plate having a wall surface provided to rise substantially perpendicularly from the plane part,
A radiating conductor plate provided substantially parallel to the bottom surface with a required interval from the bottom surface of the conductor plate;
A pair of feeding conductor plates that are conductively connected to two opposite sides of the radiation conductor plate and are provided to extend toward the bottom surface of the box-type conductor plate;
A pair of power supply pins electrically connected to the pair of power supply conductor plates and capable of supplying power with different phases of 180 °;
When the plurality of microstrip antennas are arranged in a grid pattern on the microstrip antenna support substrate, a part of the wall surface of each microstrip antenna is arranged so that it can be shared with the wall surfaces of other microstrip antennas. A microstrip antenna assembly characterized by the above. 6. The microstrip antenna assembly according to claim 5, wherein the microstrip antenna support substrate has a rectangular shape, and a plurality of microstrip antennas are arranged in a grid pattern.

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