JPS63146622A - Microwave band transmitter-receiver - Google Patents

Abstract

PURPOSE:To attain small size with simple constitution by connecting an output power amplifier and a reception amplifier directly to a cross polarized wave branching filter and locating a trap conductor rod to a waveguide placed at the input side of the cross polarized wave branching filter or the receiving amplifier. CONSTITUTION:A conductor rod 6 is placed in parallel with the plane E to the waveguide side of a coaxial waveguide converter 5. In placing the conductor rod 6 to the waveguide, series resonance takes place in case of h=lambda/4 (lambda is wavelength). As a result, a trap is formed by placing the conductor rod 6. In selecting an (h) corresponding to a transmission frequency, e.g., 14GHz, the transmission signal of 14GHz is attenuated by nearly 13dB. Through the constitution above, the transmission signal invaded to the reception side via the cross polarized wave branching filter 1 is attenuated remarkably. As a result, the improvement of the performance is realized by installing the conductor rod without introducing a waveguide filter whose characteristic depends on the shape and the size of the device is miniaturized.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a microwave band transmitting/receiving device that makes it possible to effectively improve the separation function between a transmitted signal and a received signal used in microwave communication despite its compact size. It's about machines.

Prior Art A conventional microwave band transmitter/receiver is shown in Fig. 6.
A waveguide filter 4 was present between the output power amplifier 2 and receiving amplifier 3 connected to the cross-polarized wave splitter 1 and the cross-polarized wave splitter l.

Problems to be Solved by the Invention In this way, in the conventional configuration, there is a waveguide filter 4 whose characteristics are achieved depending on its length, as shown in FIG. The shape of the peripheral structure of the polarization splitter 1 has become significantly large, making it difficult to realize a compact microwave band transceiver.

The present invention has been conceived up to this point, and it is an object of the present invention to provide a microwave band transceiver that has a simple configuration and can be realized in a small size.

Means for Solving the Problems In order to solve the above problems, the present invention removes the waveguide filter, connects the output power amplifier and the receiving amplifier directly to the cross-polarized wave splitter, and A trap conductor is installed in a waveguide installed on the input side of a polarization splitter or receiving amplifier.

Effect: With this configuration, the transmitted signal that enters the receiving side via the cross-polarization splitter is attenuated, and a compact microwave band transceiver in which the performance of the receiving amplifier does not deteriorate is realized.

Embodiment FIG. 1 shows an embodiment of the microwave band transmitter/receiver of the present invention. In FIG. In the coaxial/waveguide converter, 6 is a conductor rod.

The waveguide filter 4 installed in the conventional example of FIG. 6 is removed, and the coaxial/waveguide converter 5 in FIG.
A conductor rod 6 is installed parallel to the E plane on the waveguide side.

In the present invention, when the conductor rod 6 is installed in the waveguide shown in FIG. 2, the equivalent circuit in FIG. 2 becomes FIG. 3, and h-λ/
4 (where λ is the wavelength), series resonance occurs. As a result, a trap is formed by installing the conductor rod 6.

For example, if h corresponding to a transmission frequency of 14 GHz is determined, the transmission signal of z is approximately 13 dB as shown in Figure 4.
Attenuated.

With this configuration, the transmitted signal entering the receiving side via the cross-polarization splitter 1 is significantly attenuated as shown in FIG.

As a result, the performance can be improved as described above by installing the conductor rod 6 without introducing the waveguide filter 4 whose characteristics are determined by the shape, and the shape of the device can be made smaller.

Effects of the Invention As described above, according to the present invention, performance can be improved with an extremely simple structure, and a microwave band transceiver can be miniaturized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a microwave band transceiver according to an embodiment of the present invention, FIG. 2 is a structural diagram of main parts for explaining the present invention, and FIG. 3 is an equivalent circuit diagram of FIG. Figure 4 is the second
5 is a characteristic diagram of attenuation on the receiving side of a transmitted signal, and FIG. 6 is a block diagram of a conventional microwave band transceiver. ■...Cross polarization splitter, 2...Output power amplifier, 3...Receiving amplifier, 5...
・Coaxial/waveguide converter, 6... conductor rod.

Claims (1)

[Claims] A receiving amplifier is directly connected to a cross-polarized splitter that separates transmitted and received signals via a coaxial/waveguide converter that has a conductor bar installed parallel to the E plane on the waveguide side. A microwave band transceiver featuring: