Miniaturized reconfigurable microstrip low-pass filter

Abstract

The invention provides a miniaturized reconfigurable microstrip low-pass filter, which adopts a microstrip structure of a single-layer substrate, two cascaded coupling microstrip lines are arranged on the single-layer substrate, a variable capacitance diode is loaded at the joint of the two coupling microstrip lines, a patch large capacitor is loaded at one end of one coupling line, and the single-layer substrate is also provided with an external bias regulation and control circuit for regulating and controlling the variable capacitance diodes. According to the low-pass filter with the reconfigurable cut-off frequency, the mode that the two cascaded coupling microstrip lines are combined with the loaded variable capacitance diodes and the chip capacitors is adopted, the low-pass filter with the reconfigurable cut-off frequency is achieved, and the low-pass filter has the advantages of being small in size, simple in structure, low in loss, low in number of variable capacitance diodes, capable of regulating and controlling voltage channels and the like.

Description

technical field [0001] The invention belongs to the technical field of microwave communication, and in particular relates to a miniaturized reconfigurable microstrip low-pass filter. Background technique [0002] In recent years, spectrum resources have become increasingly scarce, and wireless communication systems are developing towards miniaturization, high integration, and low loss. The low-pass filter is an important component of the communication system. It is used to filter out the required low-frequency signals while suppressing the high-frequency signals. It is widely used in satellite communications, electronic countermeasures, radar, measurement and other fields. As a kind of low-pass filter, the reconfigurable low-pass filter can effectively use the existing spectrum resources to meet different application requirements, greatly reduce the size of the system and the number of components, and is conducive to the miniaturization and high integration of the system re...

AI Technical Summary

Problems solved by technology

However, the reconfigurable microstrip low-pass filter designed by the above-mentioned traditional method generally has problems such as large circuit size and complex structure, which are mainly due to the large size of the resonator and the loaded branches.

In addition, the above design losses are generally high, and most require multiple varactor diodes and multiple regulation voltage channels

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