Frequency down converter having matching circuit including trimming mechanism coupled to mixed coupler

Abstract

The invention provides a frequency demultiplier which is coupled with a mixing coupler, and has a matching circuit with fine adjustment mechanism, which comprises two low-noise amplifiers, a ninety-degree mixing coupler, two first matching circuits and a frequency reduction circuit, wherein the two low-noise amplifiers respectively amplify a first wireless signal and a second wireless signal to generate a first amplifying signal and a second amplifying signal. The ninety-degree mixing coupler comprises two input ports and two output ports, and can transform the first amplifying signal and thesecond amplifying signal into a first coupler output signal and a second coupler output signal. The two first matching circuits are respectively coupled with the two input ports or the two output ports of the ninety-degree mixing coupler, and respectively have a fine adjustment mechanism arranged on one side of the first matching circuits without contacting. The frequency reduction circuit is used to reduce frequency for the first coupler output signal and the second coupler output signal.

Description

technical field [0001] The present invention relates to a wireless communication receiving device, in particular to a frequency reducer (such as satellite downconverter). Background technique [0002] Due to the characteristics of broadband, broadcasting, and borderless satellite communication services, the demand for satellite receiving systems has increased year by year in recent years. However, satellite bandwidth resources are limited. In order to make full use of satellite bandwidth, linear polarization and circular polarization have been developed. Polarization and other transmission methods. Linear polarization, including vertical linear polarization (VLP) and horizontal linear polarization (horizontal linear polarization, HLP), the magnitude of the electric field changes with time, but the direction remains in the same direction, while circular polarization Including right-hand circular polarization (RHCP) and left-hand circular polarization (left-hand circular pol...

AI Technical Summary

Problems solved by technology

In addition, the degree of matching of the components located at the rear end of the ninety degree hybrid coupler 100 will also affect the cross polarization isolation

[0004] The traditional 90-degree hybrid coupler 100 has the advantages of easy design and simple manufacture, so it is widely used in satellite down-converters. Inconsistencies in accuracy may cause poor balance and matching of the polarization paths, thus affecting the overall cross-polarization isolation of the satellite down-converter, and even causing problems in the production pass rate

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