JPS6146627A - Circularly polarized wave receiver - Google Patents

Abstract

PURPOSE:To obtain an excellent cross polarized wave characteristic by cancelling the other unnecessary cross circularly polarized wave in terms of vector. CONSTITUTION:A received circularly polarized reception signal is branched by a branching device 1 into a right-handed rotatory circularly polarized wave component and a left-handed rotatory circularly polarized wave component. The right-handed rotatary circularly polarized wave component is converted into a linearly polarized wave by a right-handed rotatary-linear converter 2. On the other hand, the left-handed rotatory component is converted into a linearly po larized wave by a left-handed rotatory - linear converter 3. The said converting signal is shifted by a phase of 180 deg. by a phase shifter 4, after the level is adjusted by an attenuator 5, the result is fed to a synthesizer 6. The synthesizer 6 synthesizes an output signal of the converter 2 and a signal from the attenuator 5 in terms of vector to cancel the unnecessary left-handed rotatory polarized wave component included in the output signal of the converter 2 and eliminate it.

Description

[Detailed Description of the Invention] [Technical Field 1] The present invention relates to a circularly polarized wave that performs circularly polarized wave-linearly polarized wave conversion in a high frequency communication device such as a microwave that uses circularly polarized wave as a radio wave polarization method. The present invention relates to a receiving device.

[Background Art 1 In high-frequency radio wave propagation, circularly polarized waves are sometimes used for reasons such as reducing interference between systems and eliminating the influence of polarization shift due to transmitting and receiving locations. At this time, when using a circularly polarized wave receiving device with poor cross polarization characteristics, such as when opposite circularly polarized waves are used at adjacent frequencies, or when opposite circularly polarized wave components are generated due to reflection, etc. There was a problem that using this method caused interference.

[Objective of the Invention 1] The present invention has been provided in view of the above-mentioned points, and is a circularly polarized wave reception aimed at reducing unnecessary circularly polarized wave components and obtaining good cross-polarized wave characteristics. It provides equipment.

[Disclosure of the invention 1 Embodiments of the present invention will be described below with reference to the drawings.

The present invention aims to reduce the left-handed circularly polarized component of the crossed circularly polarized component and receive only the right-handed circularly polarized component, and a block diagram thereof is shown in diagram vJ1. The waveforms in FIGS. 2(a) to 2(f) show the waveforms at points a-f in FIG. 1. High-frequency signals such as microwaves using circularly polarized waves are shown in Figure 2 (,
) is received as a circularly polarized reception signal. Here, the solid line in the figure is the right-handed circularly polarized component of the crossed circularly polarized component,
The dashed line indicates the left-handed circularly polarized component. The received circularly polarized reception signal is input to a splitter 1, where it is divided into a right-handed circularly polarized component and a left-handed circularly polarized component. Then, the right-handed circularly polarized wave component is input to the right-handed circularly polarized wave component 2, and this right-handed circularly polarized wave component 2 converts the right-handed circularly polarized wave component into the right-handed circularly polarized wave component J shown in FIG. Convert to linear polarization.

Further, the left-handed circularly polarized wave component which is the other component from the splitter 1 is inputted to the left-handed circularly polarized wave component 3, and this left-handed circularly polarized wave component is converted into a left-handed circularly polarized wave by the left-handed circularly polarized wave converter 3 as shown in FIG. 2(c). It is converted to linear polarization as shown in . Next, the unnecessary components of the output converted to linearly polarized waves, in this case the converted signals of left-handed circularly polarized components, are shifted to a 180° phase by a phase shifter 4 as shown in FIG. 2(d). shift. Then, the signal from the phase shifter 4 is attenuated by an attenuator 5 for level adjustment as shown in FIG. 2(e). The signal from the attenuator 5 and the linearly polarized right-handed circularly polarized wave component (main polarized wave component) from the right-handed to linearly polarized wave converter 2 are combined by the combiner 6 to generate a vector signal. Figure 2 (f) after canceling the left-handed circularly polarized component.
Good linear polarization output was obtained as shown in the figure. In the embodiment, the left-handed circularly polarized wave component is treated as an unnecessary component and canceled out vectorwise, but the right-handed circularly polarized wave component may be canceled out instead.

[Effect of the invention 1 As described above, the present invention includes a splitter that distributes a high frequency wave using circularly polarized waves into crossed circularly polarized components, and a splitter that converts one of the crossed circularly polarized components from the splitter into linearly polarized waves. a first polarization converter,
a second converter that converts the other cross-circularly polarized wave component of the splitter into a linearly polarized wave; a phase shifter that shifts the output of the second converter by 180 degrees; Since it is equipped with a synthesizer that combines the output of the converter with the output of the converter and outputs a linearly polarized wave output, the other crossed circularly polarized wave component from the divider is converted into a linearly polarized wave component. By shifting the output of the second polarization converter by 180° using a phase shifter and combining the output of this phase shifter with the output from the first polarization converter using a synthesizer, this becomes unnecessary. The other cross-circularly polarized wave component is vectorially canceled to produce a linearly polarized wave output, which has the effect of obtaining good cross-polarized wave characteristics.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an operational waveform diagram of the same. 1 is a splitter, 2 is a right-handed to linear polarization converter, 3 is a left-handed to linear polarization converter, 4 is a phase shifter, and 6 is a combiner.

Claims (1)

[Claims] (1) a splitter that divides high frequency waves using circularly polarized waves into crossed circularly polarized components; a first polarization converter that converts one of the crossed circularly polarized components from the splitter into linearly polarized waves; a second converter that converts the other crossed circularly polarized wave component from the splitter into linearly polarized wave; a phase shifter that shifts the output of the second converter by 180°;
A circularly polarized wave receiver comprising a combiner that combines the output of the phase shifter and the output of the first converter to produce a linearly polarized wave output.