Millimeter wave broadband single-balance down converter and frequency conversion method

Abstract

The invention discloses a millimeter wave broadband single-balance down converter and a frequency conversion method. An antipodal fin line transition structure comprises two waveguide-microstrip antipodal fin line transitions; the radio frequency local oscillator matching circuit structure comprises two radio frequency local oscillator matching circuits; the reverse T-type diode pair is provided with a b contact, a c contact and an a contact; an input port of the waveguide coupler is connected with a radio frequency signal, and an isolation port is connected with a local oscillator signal; the straight-through port is connected with the b contact after passing through a waveguide-microstrip antipodal fin line transition and a radio frequency local oscillator matching circuit in sequence; the coupling port is connected with the c contact after passing through the other waveguide-microstrip ridge fin line transition and the other radio frequency local oscillator matching circuit in sequence; the a contact is connected with the input end of the low-pass filter through the intermediate-frequency matching circuit, and the intermediate-frequency end of the low-pass filter outputs intermediate-frequency signals. According to the waveguide coupler, the working frequency band width of radio frequency and local oscillator signals is ensured; besides, a radio frequency local oscillator matching circuit and an intermediate frequency matching circuit are arranged to reduce frequency conversion loss and is suitable for a millimeter wave broadband receiver.

Description

technical field [0001] The invention relates to the technical field of broadband single-balanced mixers, in particular to a millimeter-wave broadband single-balanced down-converter and a frequency conversion method. Background technique [0002] The millimeter-wave receiving front-end is widely used in almost all millimeter-wave application systems such as communication and radar. It solves the problem of signal frequency conversion and is the core component of the system. It is mainly composed of key components such as mixers, filters, and amplifiers. Among them, the millimeter-wave mixer is the core device of the receiving front end. Its function is to down-convert the millimeter-wave radio frequency signal to an intermediate frequency signal to realize the downward shift of the spectrum. The quality of its technical indicators greatly affects the performance of the millimeter-wave system. overall performance. Therefore, the development of high-performance millimeter-wave...

AI Technical Summary

Problems solved by technology

For 90° single-balanced mixers, domestic and foreign public reports generally use microstrip line branch line couplers as 90° hybrid networks, but this kind of coupler is difficult to apply to the millimeter wave frequency band, which limits 90° single-balanced mixing device development

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