Wideband millimeter-waveband waveguide multiplexer based on waveguide magic T

Abstract

The invention relates to a waveguide multiplexer, and particularly relates to a wideband millimeter-waveband waveguide multiplexer based on a waveguide magic T. The wideband millimeter-waveband waveguide multiplexer comprises an isolator, wherein an input end of the isolator is taken as a signal input end of the waveguide multiplexer; a signal output end of the isolator is connected with a power division network having 2n output ports; a signal output end of the power division network is connected to a waveguide filter and / or a matched load; and the waveguide filter and the matched load are arranged according to an actual demand. The isolator is positioned at a most front end of the whole structure, and is used for obstructing a hazard of an echo signal of each channel to a low noise amplifier at a front end of a power divider; and the waveguide filter at different frequencies has a relatively good echo characteristic at the input and output ends, and relatively high isolation among the output ports, thereby preventing signal crosstalk among the channels. According to the wideband millimeter-waveband waveguide multiplexer, the channels are isolated mutually, are not interfered to each other and can be overlapped between frequency bands; and a transmission path of each channel has a same length, so the insertion loss is small, the amplitude is equal and the phase is the same.

Description

technical field [0001] The invention relates to a waveguide multiplexer, in particular to a broadband millimeter-wave band waveguide multiplexer based on the magic T of the waveguide. Background technique [0002] During meteorological detection, water vapor molecules have a strong absorption band in the 1.35cm-1.6mm band (frequency 22-32GHz belongs to the K-band), and microwave remote sensing inversion is usually used to measure the microwave radiation of the atmosphere in the frequency band of 22GHz-200GHz . The water vapor profile can be obtained by observing information from the intensity and shape of the pressure broadening radiation from the water vapor line. The water vapor line type can be determined only by measuring the data of 5 channels with the least correlation. In order to reduce the noise and prevent external interference during simultaneous observation, a redundant design is required, and the key component is the selection of the waveguide multiplexer. Oxy...

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Problems solved by technology

[0004] There are many kinds of traditional waveguide multiplexers. The common one is to use the waveguide T head plus filter scheme. Whether it is a linear series connection or a star parallel connection scheme, the isolation between channels depends on the waveguide T head and the first membrane of the waveguide filter. The coupling between chips makes it form an equivalent short-circuit surface for other frequencies. Even if other frequencies are cut off, the selection of this size is related to the wavelength of the waveguide and is periodic. When there are more than 3 channels, the isolation between channels is difficult to control. Each channel interferes with each other, and in such a high frequency band, the parameters become sensitive, and machining is difficult to achieve

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