JPH02171001A - Strip line-waveguide converter - Google Patents

Abstract

PURPOSE:To attain the transmission of two polarized waves in a waveguide by arranging a short-circuit plate to a strip line closer to an end of the waveguide and a metallic plate with plural slits formed thereto to the other strip line in a prescribed position respectively. CONSTITUTION:Strip lines 21, 23 formed to the end of circuit boards 22, 24 are inserted to a square waveguide 25 respectively in two different positions with respect to the axial direction of the waveguide 25 in orthogonal directions. The end of the waveguide 25 apart from the strip line 21 for one polarized wave by nearly lambdag/4 is short-circuited by a short-circuit plate 26. Moreover, a metallic plate 28 having lots of slits 27 is arranged to a position apart from the strip line 23 for the other polarized, wave by nearly lambdag/4. Thus, the strip line-waveguide conversion to two polarized waves orthogonal to each other in the square waveguide 25 is formed.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to a stripline-waveguide converter that converts between a circular or rectangular waveguide and a stripline in the microwave band. .

[Prior Art 1] Conventionally, waveguides are often used as low-loss transmission circuits in the microwave band. On the other hand, the signal processing circuit or other circuits are formed on the +77 spline.

Conversion between the two is often via a coaxial line system.

By the way, a planar antenna for two polarized waves (horizontal and vertical polarized waves) has a structure in which seven ray antennas of two polarized waves are stacked. FIG. 10 shows a horizontally polarized wave array 7 antenna 1, which is composed of a horizontally polarized wave radiation circuit board 2 and a horizontally polarized wave feed circuit board 3. The horizontally polarized wave radiation circuit board 2 has a large number of horizontally polarized wave radiation elements 5 formed by annular slots 4 arranged in a row. A horizontal polarization feed circuit 6 is patterned on a horizontal polarization feed circuit board 3 disposed below the horizontal polarization radiation circuit board 2, with a feed point 7 at the center. FIG. 11 shows a vertically polarized array antenna 8, which is composed of a vertically polarized radiation circuit board 9 and a vertically polarized feeder circuit board 10.The vertically polarized radiation circuit board 9 has a vertically polarized radiation element. A vertically polarized power supply circuit board 10 is formed by arranging a large number of vertically polarized waves 11 and is arranged below the vertically polarized wave radiation circuit board 9.
A vertically polarized feeder circuit 12 is patterned on the
A feeding point 13 is located at the center. FIG. 12 shows a stacked state, in which the above-mentioned circuit boards 2, 3,
9.10 is the arrangement.

[The problem that the invention tries to solve! 1!1 When the conversion between the above-mentioned waveguide and the signal processing circuit formed on the strip line is performed via a coaxial line system, the following problems occur.

That is, when a coaxial line system is used for conversion between the two, there are problems in that the number of component parts increases, manufacturing cost increases, and performance variation increases. In particular, in the case of a system that uses a circular or rectangular waveguide and utilizes vertical and horizontal polarization, the above problem becomes particularly noticeable. In addition, dual polarization converters using a single waveguide window are conventionally known, but they have problems such as poor differential polarization characteristics and a narrow band.

Furthermore, the conventional example using two 7-ray antennas 1 and 8 has the following problems. If the feed points 7α7, 13 are placed at the center of both array antennas 1, 8, the feed points 7, 13 will become claws as shown in FIG. Therefore, for example, if you take out the coaxial feed terminal from the feed point 7.13 in the direction perpendicular to the antenna circuit, you will not be able to feed power to the two 7-ray antennas 1 and 8 at the same time; For power supply, it was necessary to add a power supply line and supply power at another location. Furthermore, for example, if power is supplied from two locations using the power supply terminals of a coaxial system, it is only necessary to receive one of the two polarized waves (so-called switcher pull). Introducing a receiver circuit or two receiver circuits? It was necessary to prepare and switch after down-converting.

The present invention has been provided in view of the above-mentioned points, and the conversion part between the strip line and the waveguide can be constructed easily and at low manufacturing cost, and moreover, it is possible to transmit two polarized waves at one location. Its purpose is to provide an IJ tube-waveguide converter.

1 Means for Solving the Problem 1 The present invention is directed to a strip line formed on two printed circuit boards in a direction orthogonal to a circular or rectangular waveguide from the two points of the waveguide. They are inserted at different positions in the axial direction, and short circuit plates are installed at approximately 174 wavelengths with respect to the stripline near the end of the waveguide.
A metal plate with a plurality of slits formed in the same direction as the strip line is placed in a box with approximately 1/4 wave length relative to the +7 strip line.

1 Effect] Therefore, the present invention provides a short circuit plate on the rusted surface of about 1/4 wavelength for the strip line near the end of the waveguide,
For one stripline corresponding to one polarization,
A stripline-waveguide conversion is realized, and a metal plate with a plurality of slits formed in the same direction as the stripline is placed at a location approximately 174 waves away from the other stripline, and the other stripline is converted into a waveguide. Stripline-waveguide Iff conversion is realized for the other stripline corresponding to the wave.

[Embodiment J] Hereinafter, embodiments of the present invention will be described with reference to the drawings. fI
As shown in Figure S1, strip lines 21.23 corresponding to horizontal and vertical polarized waves are formed on a circuit board 22.24 made of a printed circuit board. This circuit board 22,
Strip lines 21 and 23 formed at the ends of the waveguide W24 are inserted into the rectangular waveguide 25 in two orthogonal directions and at different positions with respect to the axial direction of the waveguide W25.

Here, as shown in FIG. 1 (1)), approximately λg/4 (λB is the waveguide 1 wave in ff25) is short-circuited by a short-circuit plate 26. Also, a metal plate 2 is provided with a large number of slits 27 as shown in FIG. 2 from the strip line 23 corresponding to the other polarized wave.
8 is placed at approximately λg/4. This configuration realizes stripline-waveguide conversion for two orthogonal polarized waves in the rectangular waveguide 25. Incidentally, a ground plane 24a is formed on the lower surface of the circuit board 4.

A large number of slits 27 are perforated in the -f metal plate 28, and the direction of the slits 27 is determined by the strip line 23.
The metal plate 28 is arranged in the waveguide 25 so as to be in the same direction as the waveguide 25. It passes through the polarized waves in the direction perpendicular to the slit 27 of the metal Ii 28, but acts as a short circuit plate for the polarized waves in the parallel direction. Therefore, it serves as a through plate for the polarized wave corresponding to the strip line 21, and serves as a short circuit plate for the strip 2-in 23, thereby realizing strip line-waveguide conversion.

Furthermore, as shown in FIG. 3, even with a circular waveguide 25, stripline-to-waveguide conversion of two polarized waves can be realized in exactly the same way.

Further, in the above embodiment, the microstrip lines were formed on the circuit board, but as shown in FIG. 4, both sides of the strip lines 21, 23 are connected to the ground 29.
It is also possible to use a so-called triplate strip line sandwiched by 30. Further, as shown in FIG. 5, since the thickness of the tri-plate is 1, it is possible to use one of the ground plates 29 as the metal plate 28 of the strip line 23. Moreover, the plurality of slits 27 of the metal plate 28 are
Compared to conventionally known waveguide windows, the r;l difference polarization characteristics are improved.

With this configuration, the stripline-waveguide converter can be constructed easily at low manufacturing cost, and furthermore,
It is possible to realize a conversion unit that enables transmission of two polarized waves.

6 to 8 show other embodiments, in which the horizontally polarized radiation circuit board 2, the horizontally polarized power supply circuit board 3, the vertically polarized radiation circuit board 9, and the vertically polarized radiation circuit board 2 used in the conventional example are shown. Power supply circuit board 1
0 are laminated, and a strip line 2 similar to the previous embodiment is placed on the horizontally polarized power supply circuit board 3 and the vertically polarized power supply circuit board 10.
1.23 is formed. Then, as in the previous embodiment, the strip lines 21 and 23 are guided as Ir! 25, and are inserted and arranged at different positions jH with respect to the axial direction of the waveguide 25, and from the strip line 21 to λ
A shorting plate 26 is placed at a distance of 8/4B, and a metal plate 28 having a plurality of slits 27 is placed at a distance of λg/4 from the other stripline 23. still,
In this case, as shown in FIG. 7, the direction of the slit 27 in the metal plate 28 is the vertical direction in the figure, matching the direction of the strip line 23. It goes without saying that this embodiment can also be applied not only to the rectangular waveguide W25 but also to a circular waveguide 25 as shown in FIG. With this configuration, as shown in FIG. 9, it is possible to transmit two modes of polarization, horizontal and vertical, with one waveguide 25. power can be supplied from one place. In addition, the waveguide 25 allows switching with low loss, making it easy to perform switchable reception, which was a disadvantage of the conventional method.

(Effects of the Invention j As described above, the present invention provides strip lines formed on two printed circuit boards in two locations perpendicular to a circular or rectangular waveguide, and in the axial direction of the waveguide. A shorting plate is inserted at a different position for the stripline near the end of the waveguide, and a shorting plate is provided at a place where the waveguide is about 1/4 wave for the stripline near the end of the waveguide. Since a metal plate with multiple slits formed in the same direction as the strip line is placed at a location, a short circuit occurs at a location approximately 1/4 wave from the strip line near the end of the waveguide. A plate is provided to achieve strifline-to-waveguide conversion for one stripline corresponding to one polarization, and the strip is placed at a location approximately 1/4 wavelength from the other stripline. By arranging a metal plate with multiple slits formed in the same direction as the line, it is possible to realize stripline-waveguide conversion for the other stripline that corresponds to the other polarization. - The converting section of the waveguide can be constructed easily at low manufacturing cost, and has the effect of realizing a converting section that enables transmission of two polarized waves.

Further, in claim 2, the horizontal polarization radiation circuit board, the horizontal polarization feeding circuit board, the vertical polarization radiation circuit board, and the vertical polarization feeding circuit board are arranged in M layers, and the horizontal polarization By forming the vertical polarization circuit board with a stripline, the stripline-waveguide conversion section can be made with one waveguide in the same way as above, and the conversion enables transmission of two polarized waves. Therefore, it is possible to feed a dual-polarized planar antenna from a distance of 1 m, and low-loss switching is possible in a waveguide, making switchable reception, which was a disadvantage of the conventional method, possible. It is effective.

[Brief explanation of the drawing]

FIG. 1(a)(1)) is a plan view and a cross-sectional view of an embodiment of the present invention, FIG. 2 is a plan view of the same metal plate, and FIG. 3 is a plan view of the same waveguide when it is circular. Flat m diagram, Fig. 4 (u) (+3
) is a plan view and a sectional view of another embodiment same as above, FIG. 5 is a sectional view of still another embodiment same as above, and FIGS. 6(a) and (b) are a plan view and sectional view of another embodiment. , Fig. 7 is a plan view of the same metal plate as above, Fig. 8 is a plan view when the above waveguide is circular, Fig. 9 is a plan view of the same as above, and Fig. 10 is a horizontally polarized wave of the conventional example. FIG. 11 is a plan view of the vertically polarized array antenna, FIG. 12 is a cross-sectional view of the same, and FIG. 13 is a plan view of two 7-ray antennas stacked together. . 2 is a horizontal polarization radiation circuit board, 3 is a horizontal polarization feeding circuit board, 9 is a vertical polarization radiation circuit board, 1a) is a vertical polarization feeding circuit board, 21.23 is a strip line, and 25 is a waveguide. , 26 is a short circuit plate, 27 is a slit, and 28 is a metal plate. Agent Patent Attorney Ishi 1) Ai 7 Figure 3 (b) Figure 4 (b) Figure 2 Figure 5 Figure 8 Figure 9 Figure 6 (G) (b) Figure 7 Figure 10 Figure 11 Figure 13 Figure 12 Procedures - 7 flj Self-published by BE) June 10, 1999 To the Commissioner of the Japan Patent Office Tsutomu Hama 1 Indication of the case 1986 Patent Application No. 326949 2 Name of the invention ↓ Lip line - Relationship with the waveguide converter correction case Patent applicant address Address 1048 Kadoma, Kadoma City, Daihanfu
3) Matsushita Electric Works Co., Ltd. Representative Akio Miyoshi

Claims (2)

[Claims] (1) Strip lines formed on two printed circuit boards are inserted into a circular or rectangular waveguide at two locations perpendicular to each other and at different positions with respect to the axial direction of the waveguide. A shorting plate is provided at a location approximately 1/4 wavelength from the stripline on the side closer to the end of the wave tube, and a plurality of short circuit plates are provided at a location approximately 1/4 wavelength from the other stripline in the same direction as the stripline. A stripline-waveguide converter characterized in that a metal plate with slits is arranged. (2) A radiation circuit board for horizontal polarization, a feeding circuit board for horizontal polarization, a radiation circuit board for vertical polarization, and a feeding circuit board for vertical polarization are stacked, and the horizontal and vertical polarization circuits described above are stacked. 2. The stripline-to-waveguide converter according to claim 1, wherein the substrate is formed of a stripline.