A q-band diaphragm type orthogonal mode coupler

Abstract

The invention relates to a Q-band partition board type orthogonal-mode coupler, which is of a broadband partition board and branch combined type, has center frequency of 40 GHz and relative bandwidth of 50%, and is applied to a radio telescope Q-band receiver system. The orthogonal-mode coupler is composed of a partition board-branch connector, a Y-shaped connector, a first n-shaped elbow, a second n-shaped elbow, a first side wall branch port, a second side wall branch port, a partition board, metal pins, matching nails, a square matrix transition piece, a first 90-degree elbow, a second 90-degree elbow, an impedance transformation section and an H-plane elbow, wherein the partition board-branch connector is used for separating two orthogonal polarization signals, the Y-shaped connector is used for synthesizing two paths of horizontal polarization signals output by the partition board-branch connector into one path of signal, and the n-shaped elbows are used for connecting the partition board-branch connector and the Y-shaped connector. The actual measurement results of reflection loss and isolation degree of the Q-band partition board type orthogonal-mode coupler approximately agree with the simulation results, thereby being capable of satisfying the needs of radio astronomical observation.

Description

technical field [0001] The invention relates to a Q-band diaphragm type 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 higher...

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 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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