A five-port passive mixer

Abstract

The invention discloses a five-port passive mixer. The five-port passive mixer includes a dielectric board, a frequency mixing element and a low-pass filter, and also includes: a five-port unit, which leads five ports, wherein the first port is used as a radio frequency input port, the second port is used as a local oscillator signal input port, the third port is connected to a low-pass filter as a mixing signal output port, and the fourth port and the fifth port are used as a mixing frequency Component access port. The five-port passive mixer of the present invention cancels the independent matching unit in the ordinary mixer and directly matches the components, deletes the matching unit, and makes the circuit structure compact; due to the flexibility of the five-port unit itself, it reduces Due to the restrictions on the placement of frequency mixing components, the layout arrangement is more flexible and simple, easy to place and easy to implement; the device has good linearity; it adopts a planar microstrip structure, which is easy to integrate and low in cost.

Description

technical field [0001] The invention belongs to the field of microwave technology, and relates to a passive mixer, in particular to a five-port passive mixer. Background technique [0002] Mixer is a common microwave device that uses nonlinear devices to shift spectrum. It is widely used in microwave communication, radar, remote control, reconnaissance, electronic countermeasures and other fields. In a general communication system, when transmitting a signal, the signal to be transmitted is first subjected to signal processing such as modulation and spread spectrum in the low frequency band, and then needs to be converted to a high frequency band by a mixer, and finally can be transmitted through the antenna. Similarly, when receiving a signal, the received high-frequency signal needs to be converted to a low-frequency band by a mixer, and then undergo various processing on it to finally obtain the desired signal. It can be seen that the mixer plays an extremely important r...

AI Technical Summary

Problems solved by technology

In order to achieve the lowest conversion loss in the existing mixer, an additional matching unit is usually required, but the matching unit increases the difficulty of miniaturization of the mixer

In addition, in the existing mixer, the welding position of the mixing components is relatively fixed, and the component layout cannot be flexibly arranged according to the design of the mixer

For example, in a single-balanced diode mixer, two diodes need to be soldered to the same connection point at the same time, so the distribution of the two diodes is relatively fixed, which undoubtedly increases the difficulty of the mixer structure layout

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