JP2007228036A - Waveguide/microstrip line converter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waveguide/microstrip line converter whereby a distance between a short-circuit face and a dielectric board formed with a probe conductor can be decreased more than that of a conventional waveguide/microstrip line converter and the distance can optionally be set. <P>SOLUTION: The waveguide/microstrip line converter is provided with a waveguide 1 and the dielectric board 2 inserted from a window 3 provided to a side wall of the waveguide 1, the short-circuit face 6 is provided to one side of the waveguide 1 when viewed from the inserted dielectric board 2, and a barrier conductor 8 projected from an inner wall of the waveguide in an inner direction is provided to the other side, and the dielectric board 2 includes a strip conductor 4a formed on one side of the dielectric board 2, the tip open type probe conductor 5 electrically connected to the strip conductor 4a, and a ground conductor 4b formed on the side opposite to the one side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides a waveguide / microstrip line conversion in which the distance between the short-circuit surface and the dielectric substrate on which the probe conductor is formed can be made shorter than the conventional one, and the distance can be set arbitrarily. It is about a vessel.

  In the conventional waveguide / microstrip converter, a dielectric substrate on which an open-ended probe conductor and a microstrip line connected thereto are formed is connected to the waveguide short-circuit surface by about 1 wavelength within the waveguide. / 4, that is, by inserting through the dielectric substrate insertion port provided on the side wall of the waveguide at the position where the magnetic field in the waveguide is maximized, the propagation mode of the waveguide and the propagation of the microstrip line The modes can be well coupled, and the microwave propagating through the waveguide can be propagated to the microstrip line without causing large reflection (see, for example, Patent Documents 1 and 2).

JP-A-6-140816 JP 2003-298322 A

  In the conventional waveguide / microstrip line converter, a space having a distance of about ¼ of the wavelength in the waveguide is necessarily required between the short-circuit surface and the dielectric substrate on which the probe conductor is formed. There is a problem that it is difficult to mount the device on a device that is difficult to secure this space.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to convert the distance between the short-circuit surface and the dielectric substrate on which the probe conductor is formed into a conventional waveguide / microstrip conversion. It is possible to obtain a waveguide / microstrip line converter that can be made shorter than the device and whose distance can be set arbitrarily.

  In addition, it can be installed in devices where it is difficult to secure a space having a distance of about ¼ of the wavelength in the waveguide, and it has the function of distributing the waveguide output in two by combining with a T-branch circuit. A waveguide / microstrip line converter is obtained.

  The waveguide / microstrip line converter according to the present invention includes a waveguide and a dielectric substrate inserted from a window provided on a side wall of the waveguide, and the waveguide is inserted. The dielectric substrate has a short-circuit surface on one side and a partition conductor protruding inward from the inner wall of the waveguide on the other side, and the dielectric substrate is a strip conductor formed on one surface. And an open-ended probe conductor electrically connected to the strip conductor, and a ground conductor formed on the surface opposite to the one surface.

  In the waveguide / microstrip line converter according to the present invention, the distance between the short-circuit surface and the dielectric substrate on which the probe conductor is formed can be shorter than that of the conventional waveguide / microstrip converter, and There is an effect that the distance can be arbitrarily set.

Embodiment 1 FIG.
A waveguide / microstrip line converter according to Embodiment 1 of the present invention will be described with reference to FIG. 1 is a perspective view showing a configuration of a waveguide / microstrip line converter according to Embodiment 1 of the present invention. In the following, in each figure, the same reference numerals indicate the same or corresponding parts.

  In FIG. 1, the waveguide / microstrip line converter according to the first embodiment has a waveguide 1 having a short-circuit surface 6 and an output opening 7, and a portion of the tube wall of the waveguide 1 removed. The dielectric substrate 2 inserted from the window 3, the strip conductor 4a formed on one surface of the dielectric substrate 2, and the surface opposite to the surface on which the strip conductor 4a of the dielectric substrate 2 is formed. The ground conductor 4b, the open-ended probe conductor 5 formed on the same surface as the surface on which the strip conductor 4a of the dielectric substrate 2 is formed, and electrically connected to the strip conductor 4a, and the waveguide 1 A partition wall conductor 8 protruding from the tube wall into the inside of the waveguide 1 is provided.

  The dielectric substrate 2 is inserted into the waveguide 1 from the window 3 such that the probe conductor 5 formed on the dielectric substrate 2 is disposed inside the waveguide 1. The ground conductor 4 b formed on the dielectric substrate 2 is electrically connected to the waveguide 1. The partition wall conductor 8 is disposed on the tube wall of the waveguide 1 facing the dielectric substrate 2 inserted into the waveguide 1 and on the output opening 7 side of the dielectric substrate 2. Further, the microstrip line 4 is constituted by the strip conductor 4a formed on one surface of the dielectric substrate 2 and the ground conductor 4b formed on the surface opposite to the surface on which the strip conductor 4a is formed. . In FIG. 1, the thickness of the waveguide, the supporting member for the dielectric substrate 2 and the like are omitted for convenience of explanation.

  Next, the operation of the waveguide / microstrip line converter according to the first embodiment will be described with reference to the drawings.

  Consider a case where a microwave is input from the microstrip line 4. The microwave input from the microstrip line 4 forms an electric field in the waveguide 1 by the probe conductor 5. The electric field concentrates on the partition conductor 8, and microwaves are radiated into the waveguide 1 using this as a wave source, and the microwave propagates in the waveguide 1.

  By concentrating the electric field formed by the probe conductor 5 on the partition conductor 8, the susceptance component is not significantly changed with respect to the impedance of the connection portion between the probe conductor 5 and the waveguide 1 without greatly changing the conductance component (real part). Since the (imaginary part) can be added, by appropriately selecting the dimensions and positional relationship between the probe conductor 5 and the partition wall conductor 8, the wavelength becomes shorter than about 1/4 of the wavelength in the waveguide as viewed from the probe conductor 5. The reflection from the short-circuit surface 6 provided at the position can be canceled by the susceptance component added to the impedance of the connection portion between the probe conductor 5 and the waveguide 1, and line conversion from the microstrip line 4 to the waveguide 1 can be performed. It becomes possible.

  By adopting the above-described configuration, the distance from the dielectric substrate 2 to the short-circuit surface 6 is shortened to about 1/4 of the wavelength in the waveguide that was conventionally required, and the waveguide / A microstrip line converter can be obtained. It goes without saying that the distance from the dielectric substrate 2 to the short-circuit surface 6 can be set to an arbitrary distance by adjusting the arrangement position and dimensions of the partition conductor 8. For example, the distance between the dielectric substrate 2 and the partition conductor 8 is set to 1/10 or less of the guide wavelength in the waveguide 1, or the distance between the dielectric substrate 2 and the short-circuit surface 6 is set to 1 of the guide wavelength in the waveguide 1. / 8 or less.

Embodiment 2. FIG.
A waveguide / microstrip line converter according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 2 is a perspective view showing a configuration of a waveguide / microstrip line converter according to Embodiment 2 of the present invention.

  In FIG. 2, the waveguide / microstrip line converter according to the second embodiment protrudes from the tube wall of the waveguide 1 facing the partition wall conductor 8 in addition to the configuration of the first embodiment. There is provided a conductor plate 9 and a branching waveguide 10 having output openings 11a and 11b and connected to the waveguide 1 so that the partition wall conductor 8 and the conductor plate 9 are part of the tube wall. Yes. The branch waveguide 10 constitutes a T branch circuit by being connected to the waveguide 1 with the partition wall conductor 8 and the conductor plate 9 as part of the tube wall. The thickness of the waveguide is omitted for convenience of explanation. In addition, the same components as those in the first embodiment are denoted by the same reference numerals.

  With this configuration, the partition wall conductor 8 is used as a member for shortening the distance from the waveguide / microstrip line conversion dielectric substrate to the waveguide short-circuit surface, and in combination with the conductor plate 9. Therefore, a waveguide / microstrip line converter having a small size and a function of distributing the output of the waveguide 1 into two can be obtained.

  It goes without saying that the distance from the dielectric substrate 2 to the short-circuit surface 6 can be set to an arbitrary distance by adjusting the arrangement position and dimensions of the partition conductor 8. It goes without saying that the distribution characteristics of the T-branch circuit can be adjusted by adjusting the dimensions of the conductor plate 9.

Embodiment 3 FIG.
A waveguide / microstrip line converter according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 3 is a perspective view showing a configuration of a waveguide / microstrip line converter according to Embodiment 3 of the present invention.

  3, the waveguide / microstrip line converter according to the third embodiment includes a dielectric substrate 2 having a strip conductor 4a, a ground conductor 4b, and a probe conductor 5, an output opening 7 and a partition conductor 8. A first waveguide 12 having a short-circuit surface 6 and a second waveguide 13 having an opening having the same size as that of the first waveguide 12 are provided.

  On the dielectric substrate 2, a ground conductor 14 formed on the same surface as the microstrip line 4 and a portion corresponding to the thickness of the first waveguide 12 (shaded portion), and a ground conductor 14 And a through hole 15 for electrically connecting the ground conductor 4b. Further, a notch 16 is provided in the first waveguide 12 so as to straddle the strip conductor 4a. When the dielectric substrate 2 is turned upside down, the notch 16 is similarly provided in the second waveguide 13 so as to straddle the strip conductor 4a. In FIG. 3, the thickness of the waveguide is omitted for convenience of explanation. In addition, the same components as those in the first embodiment are denoted by the same reference numerals.

  The ground conductor 4b is formed so as to exclude a portion of the conductor corresponding to the opening shape of the second waveguide 13, and the first waveguide 12 and the first conductor 12b are formed by the ground conductor 14, the through hole 15, and the ground conductor 4b. The waveguide / microstrip line converter is obtained by sandwiching the dielectric substrate 2 between the first waveguide 12 and the second waveguide 13 so that the two waveguides 13 are electrically connected. It is composed.

  By adopting such a configuration, the window 3 provided in the waveguide 1 shown in the first embodiment is reduced, and a high-frequency region in which microfabrication of the dielectric substrate 2 inserted from the window 3 becomes difficult. However, a waveguide / microstrip line converter having the same effect as that of the first embodiment can be easily obtained. It goes without saying that the distance from the dielectric substrate 2 to the short-circuit surface 6 can be set to an arbitrary distance by adjusting the arrangement position and dimensions of the partition conductor 8. For example, the distance between the dielectric substrate 2 and the partition conductor 8 is set to 1/10 or less of the in-tube wavelength in the first waveguide 12, or the distance between the dielectric substrate 2 and the short-circuit surface 6 is set to the first waveguide. 12 may be 1/8 or less of the in-tube wavelength.

Embodiment 4 FIG.
A waveguide / microstrip line converter according to Embodiment 4 of the present invention will be described with reference to FIG. 4 is a perspective view showing a configuration of a waveguide / microstrip line converter according to Embodiment 4 of the present invention.

  4, the waveguide / microstrip line converter according to the fourth embodiment includes a five-dielectric substrate 2 having a strip conductor 4a, a ground conductor 4b, and a probe conductor, an output opening 7 and a partition conductor 8. A first waveguide 12 having a short-circuit surface 6, a second waveguide 13 having an opening having the same size as the first waveguide 12, and a first opposing the partition conductor 8. The conductor plate 9 protruding from the tube wall of the waveguide 12 and the output openings 11a and 11b are connected to the first waveguide 12 and the partition wall conductor 8 and the conductor plate 9 are connected to the tube wall. A part of the branching waveguide 10 is provided. The thickness of the waveguide is omitted for convenience of explanation. Further, the same reference numerals are assigned to the same components as those in the second and third embodiments.

  The branch waveguide 10 is connected to the first waveguide 12 by using the partition conductor 8 and the conductor plate 9 as a part of the tube wall to constitute a T branch circuit.

  With such a configuration, the partition wall conductor 8 is used as a member for shortening the distance from the dielectric substrate 2 of the waveguide / microstrip line conversion to the short-circuit surface 6, and in combination with the conductor plate 9, Since it can be used as a member for adjusting the characteristics of the T-branch circuit, it is possible to obtain a waveguide / microstrip line converter that is small in size and has a function of distributing the output of the first waveguide 12 into two. . It goes without saying that the distance from the dielectric substrate 2 to the short-circuit surface 6 can be set to an arbitrary distance by adjusting the arrangement position and dimensions of the partition conductor 8. Furthermore, it goes without saying that the distribution characteristics of the T-branch circuit can be adjusted by adjusting the dimensions of the conductor plate 9.

Embodiment 5 FIG.
A waveguide / microstrip line converter according to Embodiment 5 of the present invention will be described with reference to FIG. FIG. 5 is a perspective view showing a configuration of a waveguide / microstrip line converter according to Embodiment 5 of the present invention.

  In the first embodiment, conductors having uniform widths are used for the strip conductors 4a formed on the probe conductor 5 and the dielectric substrate 2, respectively. In the fifth embodiment, a plurality of widths are used. By using a conductor, the frequency bandwidth can be adjusted.

  In FIG. 5, the waveguide / microstrip line converter according to the fifth embodiment has a waveguide 1 having a short-circuit surface 6 and an output opening 7, and a part of the tube wall of the waveguide 1 are removed. The dielectric substrate 2 inserted from the window 3, the ground conductor 4b formed on the surface opposite to the surface on which the strip conductor 17 of the dielectric substrate 2 is formed, and the strip conductor 17 of the dielectric substrate 2 are formed. A probe conductor 18 that is formed on the same plane as that of the strip conductor 17 and is electrically connected to the strip conductor 17; and a bulkhead conductor 8 that protrudes from the tube wall of the waveguide 1 to the inside of the waveguide 1. Yes. The thickness of the waveguide is omitted for convenience of explanation. In addition, the same components as those in the first embodiment are denoted by the same reference numerals.

  The strip conductor 17 is constituted by a plurality of conductor widths, and the probe conductor 18 is also constituted by a plurality of conductor widths.

  With such a configuration, the distance from the dielectric substrate 2 of the waveguide / microstrip line conversion to the short-circuit surface 6 is shortened by the partition conductor 8, and the strip conductor 17 and the probe conductor 18 are formed with a plurality of conductor widths. By configuring this, the frequency bandwidth can be adjusted, and a small waveguide / microstrip line converter can be obtained.

  In the waveguide / microstrip line converters of the above-described second to fourth embodiments, the strip conductor 4a and the probe conductor 5 are replaced with the strip conductor 17 and the probe conductor 18 having a plurality of width conductors. Needless to say, similar effects can be obtained. In addition, although the strip conductor 17 and the probe conductor 18 have a plurality of conductor widths, either one may be used. Furthermore, it goes without saying that the distance from the dielectric substrate 2 to the short-circuit surface 6 can be set to an arbitrary distance by adjusting the arrangement position and dimensions of the partition conductor 8.

It is a perspective view which shows the structure of the waveguide / microstrip line | wire converter which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the waveguide / microstrip line converter based on Embodiment 2 of this invention. It is a perspective view which shows the structure of the waveguide / microstrip line converter based on Embodiment 3 of this invention. It is a perspective view which shows the structure of the waveguide / microstrip line converter based on Embodiment 4 of this invention. It is a perspective view which shows the structure of the waveguide / microstrip line converter based on Embodiment 5 of this invention.

Explanation of symbols

  1 waveguide, 2 dielectric substrate, 3 window, 4 microstrip line, 4a strip conductor, 4b ground conductor, 5 probe conductor, 6 short-circuit surface, 7 output opening, 8 bulkhead conductor, 9 conductor plate, 10 branching conductor Wave tube, 11a, 11b Output aperture, 12 First waveguide, 13 Second waveguide, 14 Ground conductor, 15 Through hole, 17 Strip conductor, 18 Probe conductor.

Claims (10)

A waveguide;
A dielectric substrate inserted from a window provided on a side wall of the waveguide,
The waveguide has a short-circuited surface on one side, as viewed from the inserted dielectric substrate, and a partition wall conductor protruding inward from the inner wall of the waveguide on the other side,
The dielectric substrate has a strip conductor formed on one surface and an open-ended probe conductor electrically connected to the strip conductor, and a ground formed on a surface opposite to the one surface. A waveguide / microstrip line converter comprising a conductor. The waveguide / microstrip line converter according to claim 1, wherein a distance between the dielectric substrate and the partition conductor is 1/10 or less of an in-tube wavelength in the waveguide. The waveguide / microstrip line converter according to claim 1 or 2, wherein a distance between the dielectric substrate and the short-circuit plane is 1/8 or less of an in-tube wavelength in the waveguide. A branching waveguide having output openings at both ends;
The waveguide further includes a conductor plate protruding inward from an inner wall of the waveguide facing the partition conductor,
The waveguide and the branch waveguide are connected such that the partition conductor and the conductor plate constitute a part of a tube wall of the branch waveguide. A waveguide / microstrip line converter as described. A first waveguide having a bulkhead conductor projecting inward from the inner wall;
A second waveguide having a short-circuited surface in one opening;
A dielectric substrate sandwiched between the first waveguide and the second waveguide,
The dielectric substrate has a strip conductor formed on one surface, an open-ended probe conductor electrically connected to the strip conductor, and a ground conductor formed so as to surround the probe conductor, A ground conductor formed to remove a part of the conductor on a surface opposite to the one surface, and the ground conductor formed on a surface opposite to the ground conductor formed on the one surface; Further having a through hole for electrically connecting
A notch is provided in the first waveguide or the second waveguide at a position corresponding to a portion where the strip conductor and the probe conductor are connected to each other. Stripline converter. The waveguide / microstrip line converter according to claim 5, wherein a distance between the dielectric substrate and the partition conductor is 1/10 or less of an in-tube wavelength in the first waveguide. The waveguide / microstrip line converter according to claim 5 or 6, wherein a distance between the dielectric substrate and the short-circuit plane is 1/8 or less of an in-tube wavelength in the first waveguide. . A branching waveguide having output openings at both ends;
The first waveguide further includes a conductor plate protruding inward from an inner wall of the waveguide facing the partition conductor,
6. The first waveguide and the branch waveguide are connected so that the partition conductor and the conductor plate constitute a part of a tube wall of the branch waveguide. 8. The waveguide / microstrip line converter according to 6 or 7. The waveguide / microstrip line converter according to any one of claims 1 to 8, wherein the probe conductor formed on the dielectric substrate has a plurality of conductor widths. The waveguide / microstrip line converter according to any one of claims 1 to 9, wherein the strip conductor formed on the dielectric substrate has a plurality of conductor widths.

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