Low noise block downconverter with high isolation

Abstract

A low noise block downconverter with high isolation comprises a body, a circuit board, a waveguide tube and an electricity feeding device, wherein a containing space is formed in the body, the circuit board is arranged in the containing space, the waveguide tube is a tube body extending forwards from the body, and the electricity feeding is formed by concentric rings which are connected in series and are arranged at the front end of the waveguide tube. The body is composed of a front shell body and a back shell body, wherein the side edge, located on a first waveguide cavity chamber of the waveguide tube, of the front shell body is communicated and provided with a third waveguide cavity chamber convexly protruding forwards. The back shell body, opposite to the third waveguide cavity chamber, is provided with a fourth waveguide cavity chamber convexly protruding backwards. The back shell body, opposite to the first waveguide cavity chamber of the waveguide tube, is provided with a second waveguide cavity chamber convexly protruding backwards. The surface of the back side face, corresponding to the second waveguide cavity chamber and the fourth waveguide cavity chamber, of the circuit board is directly provided with a horizontal probe and a vertical probe in a printing mode. The low noise block downconverter with the high isolation has the advantages that the isolation between a horizontal electric wave and a vertical electric wave is improved, the positioning of the probes is accurate, production assembling is easy, and the purpose of combining good isolation and convenient production is achieved.

Description

technical field [0001] The invention relates to a low noise block downconverter (LNB: Low Noise Block downconverter), especially a low noise block downconverter with high isolation that can reduce the mutual interference of horizontal and vertical signals fed into the waveguide. frequency converter (LNB). Background technique [0002] Low Noise Block downconverter (LNB: Low Noise Block downconverter), through feedhorn, waveguide, and probe installed in the waveguide, used to receive satellite dish antenna (dish antenna) picks up the weak high-frequency satellite signal, amplifies it and then down-converts it to an intermediate frequency for the output of the coaxial cable. [0003] Furthermore, most microwave signals transmitted from satellites generally use linearly polarized vertical waves and horizontal waves. Therefore, when the satellite downconverter receives the two kinds of radio waves at the same time, it must isolate the linearly polarized signals to a certain ex...

AI Technical Summary

Problems solved by technology

[0012] The main technical problem to be solved by the present invention is to overcome the disadvantages of poor signal isolation caused by the probe structure in the prior art, and to provide a high-isolation low-noise frequency reducer, which has improved levels of electric waves and The effect of vertical radio wave isolation makes the positioning of the probe accurate, and the production and assembly are easy, so as to achieve the effect of combining good isolation and convenient production.

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