JPH0335841B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a waveguide type linear polarization switcher used for polarization switching in a transmission system for both horizontal and vertical linearly polarized waves in the microwave band. It is something.

[Prior Art] As shown in FIG. 3, a conventional waveguide-type linear polarization switching device is equipped with a circular main waveguide 1, and an end plate 2 of the main waveguide 1 has a tube axis of the main waveguide 1. A hole 3 is provided at a position corresponding to , and a switching shaft 4 made of a dielectric material is rotatably inserted into the hole 3 from outside the end plate 2 in a direction perpendicular to the end plate 2 . An L-shaped linearly polarized wave transmitting/receiving antenna 5 is supported on the switching shaft 4 and is rotatably protruded into the main wave tube 1 . The antenna 5 is provided in a direction perpendicular to the tube axis through a straight portion 5A passing through the center of the hole 3 and parallel to the tube axis of the main waveguide 1, and a bent portion 5B at the tip of the straight portion 5A. The base of the linear portion 5A is coaxially supported by the switching shaft 4, and the tip side of the linear portion 5A and a bent portion 5B are connected to the tip side of the linear portion 5A. A mechanically continuous horizontal and vertical polarization switching transmitting/receiving section 5C is protruded into the main wave tube 1 through the main waveguide 1. A coaxial converter 6 is attached outside the end plate 2 of the main waveguide 1 in a direction perpendicular to the tube axis of the main waveguide 1 . The coaxial converter 6 has a rectangular connecting waveguide 7 installed outside the end plate 2 in a direction perpendicular to the tube axis of the main waveguide 1. The switching shaft 4 is passed through and led out to the outside on the opposite side. A rectangular conversion waveguide 8 is connected to the connection waveguide 7.
is connected to the conversion waveguide 8, and a coaxial connector 9 is connected to the conversion waveguide 8.
is installed. The coaxial connector 9 has a connector outer conductor 9A attached to the conversion waveguide 8 in correspondence with the hole 10 of the conversion waveguide 8, and a connector center conductor 9B protruding into the conversion waveguide 8.

[Problems to be Solved by the Invention] Such a waveguide-type linear polarization switcher is capable of . Furthermore, such a structure has the problem that the coaxial converter becomes large in size.

An object of the present invention is to provide a waveguide type linear polarization switching device that can reduce the number of locations where matching problems occur to one location, and that can easily downsize the coaxial converter section. It's about doing.

[Means for solving the problems] The means of the present invention for achieving the above object are as follows:
Referring to FIGS. 1 and 2, which correspond to embodiments, the present invention will be described in detail. The outer conductor casing 11 is attached in a direction perpendicular to the tube axis of the tube 1, and the switching shaft 4 of the linearly polarized wave transmitting/receiving antenna 5 in the main wave tube 1 is rotatable. Casing 11
A linear portion 5A of the antenna 5 within the switching shaft 4 is provided coaxially with the outer periphery of the switching shaft 4 within the switching shaft 4.
and the coaxial conversion ring 13 that constitutes the coaxial line.
and a connecting center conductor 17 connected to the coaxial conversion ring 13 within the outer conductor casing 11.
It is characterized by having a structure having the following.

[Function] In such a waveguide linear polarization switching device, the signal received by the linear polarization transmitting/receiving antenna 5 is transferred between the linear portion 5A of the antenna 5 in the coaxial converter 6 and the coaxial conversion ring 13. Coaxial conversion is made with
It is taken out via the connecting center conductor 17.

[Example] This example will be described below with reference to FIGS. 1 and 2. Note that parts corresponding to those in FIG. 3 described above are given the same reference numerals. In this embodiment, the coaxial converter 6 has an outer conductor casing 11 mounted outside the end plate 2 in a direction perpendicular to the pipe axis of the circular main waveguide 1, and the switching shaft 4 is connected to the outer conductor casing 11. It crosses the casing 11 and is led out to the outside. The linear portion 5A of the linearly polarized wave transmitting/receiving antenna 5 is
It is inserted into the switching shaft 4 over a predetermined length. That is, the position of the open end 5D of the linear portion 5A of the antenna 5 is determined so as to create an electrical short circuit on the inner surface 12 of the outer conductor casing 11. A coaxial conversion ring 13 is coaxially provided on the outer periphery of the switching shaft 4 in the outer conductor casing 11 so that the switching shaft 4 can rotate freely, and the end plate 2
is supported by This coaxial switching ring 13 is
It constitutes a coaxial line with a linear portion 5A that is a part of the antenna 5. A coaxial connector 14 is attached to the outer surface of the outer conductor casing 11. This coaxial connector 14 has an outer conductor casing 11
It consists of a connector outer conductor 14A attached to the outer conductor casing 11 corresponding to the hole 15, and a connector center conductor 14B coaxially provided at the center thereof and insulated and supported in the hole 15 by an insulator 16. There is. Inside the outer conductor casing 11, the connector center conductor 14B and the coaxial conversion ring 13 are connected to each other by a connection center conductor 17. The shape, length, and inner and outer diameter dimensions of the coaxial conversion ring 13 are determined so as to achieve good impedance matching. Furthermore, the shape and coaxial inner diameter of the outer conductor casing 11 surrounding the coaxial conversion ring 13 are determined so that microwave energy is efficiently propagated from the straight portion 5A to the connection center conductor 17. The wall thickness of the outer conductor casing 11 through which the switching shaft 4 passes is determined to a size that does not interfere with the electrical performance of the open end 5D of the linear portion 5A. Connect the coaxial connector 14 to the outer conductor casing 1
1 may be located at any rotational angle with respect to the linear portion 5A.

In such a linear polarization switcher, the main waveguide 1
Of the vertical and horizontal dual linearly polarized waves incident from the input end (not shown), the linearly polarized wave 18 whose main electric field is orthogonal to the horizontal and vertical polarization switching transmitting/receiving section 5C of the linearly polarized transmitting/receiving antenna 5 is as follows: It is not received by the horizontal/vertical polarization switching transmitter/receiver 5C and is reflected by the end plate 2 toward the power source side. On the other hand, the linearly polarized wave 19 whose main electric field is parallel to the horizontal/vertical polarization switching transmitting/receiving section 5C of the antenna 5 is received by the horizontal/vertical polarization switching transmitting/receiving section 5C. Next, when receiving the linearly polarized wave 18, the horizontal/vertical polarization switching transceiver section 5C of the antenna 5 is rotated 90 degrees clockwise or counterclockwise via the switching shaft 4. In this way, the linearly polarized wave 18 and the horizontal/vertical polarization switching transmission/reception signal 5C of the antenna 5 are parallel, and the linearly polarized wave 18 is received.

The received linearly polarized waves 18 and 19 are converted into coaxial mode signals by the linear portion 5A in the coaxial converter 6 and the coaxial ring 13, and then sent to the coaxial connector 14 via the connecting center conductor 17 and the outer conductor casing 11.
output to the outside.

Note that the main wave tube 1 is not limited to a circular shape, but may be rectangular.

Further, the coaxial connector 14 may be omitted and a device such as an amplifier may be directly connected to the connection center conductor 17.

Furthermore, the switching shaft 4 may not be inserted into the hole 3 of the end plate 2, but may be stopped before it, and cantilevered by the outer conductor casing 11.

Furthermore, the connecting center conductor 17 can also be formed into a stripline.

[Effects of the Invention] As explained above, the waveguide type linear polarization switching device according to the present invention performs coaxial conversion of a signal received by a linear polarization transmitting/receiving antenna with a part of the antenna in a coaxial converter. Coaxial conversion is performed between the coaxial conversion ring and the resulting coaxial mode signal is extracted through the connection center conductor connected to the coaxial conversion ring and the outer conductor casing surrounding it, resulting in low impedance and waveguide of the coaxial system. The problem of matching with the high impedance of the pipe system is reduced to one location, and matching can be facilitated. Further, according to the present invention, it is possible to downsize the coaxial converter portion.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a waveguide type linear polarization switching device according to the present invention, and FIG.
- An X-ray cross-sectional view, and FIG. 3 is a vertical cross-sectional view of a conventional switching device of this type. 1... Main waveguide, 2... End plate, 3... Hole, 4...
...Switching axis, 5...Linearly polarized wave transmitting and receiving antenna, 5
A...Straight portion, 5B...Bending portion, 5C...Horizontal and vertical polarization switching transceiver section, 6...Coaxial converter, 11...Outer conductor casing, 13...Coaxial conversion ring, 14... Coaxial connector, 14B...
Connector center conductor, 17... Connection center conductor.

Claims (1)

[Claims] 1. A hole is drilled in the end plate of the main waveguide, and a switching shaft made of a dielectric material is rotatably disposed outside the end plate in a direction orthogonal to the end plate, corresponding to the hole,
A linear portion of a linearly polarized wave transmitting/receiving antenna that is rotated by the switching shaft is supported on the switching shaft, and a horizontal/vertical polarization switching transmitting/receiving section mechanically continuous with the linear portion is connected to the main wave. A coaxial transducer is rotatably protruded into the pipe, and a coaxial transducer is attached to the outside of the end plate in a direction perpendicular to the pipe axis of the main waveguide, and the switching shaft is guided to the outside across the coaxial transducer. In the waveguide type linear polarization switching device, the coaxial converter includes an outer conductor casing installed outside the end plate in a direction perpendicular to the tube axis of the main waveguide, and the switching axis. a coaxial conversion ring which is rotatably provided coaxially on the outer periphery of the switching shaft within the external conductor casing and forms a coaxial line with the linear portion of the antenna within the switching shaft; , and a connection center conductor connected to the coaxial conversion ring within the outer conductor casing.