A Q-Band Ridge Transition Orthogonal Mode Coupler

Abstract

The invention relates to a Q-waveband ridge transition ortho-mode transducer. The coupler is of a broadband double-ridge transition-branch synthetic structure, has a center frequency of 40GHz and relative bandwidth of 50% and is used for a radio telescope Q-waveband receiver system. The ortho-mode transducer is composed of a double-ridge transition-branch joint, a Y-shaped joint, a first E-shaped bend, a second E-shaped bend, a first sidewall branch port, a second sidewall branch port, double ridges, a double-ridge transition segment, a coupling screw, an inductive diaphragm, a first 90-degree bend, a second 90-degree bend and an impedance transformation segment, wherein the double-ridge transition-branch joint is mainly used for separating two orthogonally polarized signals, double-ridge transition in a straight channel employs three steps, and a sidewall branch channel introduces the coupling screw and the inductive diaphragm; the Y-shaped joint is used for combining two horizontally polarized signals output by the double-ridge transition-branch joint into one signal; and the E-shaped bends are used for connecting the double-ridge transition-branch joint with the Y-shaped joint. The actual measurement results of reflection loss and isolation of the coupler are basically consistent with simulation results, and thus the radio astronomical observation demand is satisfied.

Description

technical field [0001] The invention relates to a Q-band ridge transition orthogonal mode coupler, which is specially used for wideband microwave receivers in the field of radio astronomy. Background technique [0002] In recent years, with the continuous development of the field of radio astronomy, the demand for the operating bandwidth and operating frequency of the radio telescope receiver system has been increasing. -Mode Transducer) to expand the working bandwidth and optimize the processing and assembly procedures of high-frequency OMT. [0003] In radio astronomy, Q-band receivers can be used for observations such as molecular spectral line surveys and high redshift CO spectral lines. The Xinjiang Astronomical Observatory of the Chinese Academy of Sciences plans to carry out Q-band observations on the Nanshan 25-meter radio telescope, with an observation frequency of 30-50 GHz and a working bandwidth percentage of 50%. Because the Q-band observation frequency is high...

AI Technical Summary

Problems solved by technology

Among them, the fin linear OMT, four-ridge OMT, and double-ridge transition-coaxial output OMT are all coaxial output ports. It is relatively difficult to manufacture, process, assemble and debug in the frequency band above Ka, and it is impossible to achieve mass production.

The structure of the four-arm synthetic OMT is relatively complex, and the insertion loss is relatively large, which is not conducive to reducing the noise temperature of the antenna feeder system

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