Adjustable duplexer based on folded open-loop resonators

Abstract

The invention discloses an adjustable duplexer based on folded open-loop resonators. The adjustable duplexer comprises an upper microstrip structure layer, a middle dielectric plate layer and a lower grounding metal layer, wherein the upper microstrip structure layer comprises three input/output feeder lines, three blocking capacitors, a pair of first channel adjustable open-loop resonators and a pair of second channel adjustable open-loop resonators. Each adjustable open-loop resonator is composed of a folded microstrip line, a termination varactor diode, a center-loaded capacitor and a resistor, wherein the termination varactor diode is used for adjusting the center frequency of each channel; and the center-loaded capacitor and the resistor are used for restraining the harmonic component of each channel. A first input port and a second output port form a first channel transmission path, the first input port and a third output port form a second channel transmission path, and the two channels are mutually little influenced. The adjustable duplexer has the advantages that the center frequency of each channel is independently adjustable, the isolation degree is high, the structure is simply designed, the electric performance is good, and circuit integration and system packaging can be realized easily.

Description

technical field [0001] The invention relates to a radio frequency adjustable duplexer based on varactor diodes, in particular to a radio frequency adjustable duplexer with independently adjustable channels, high isolation and high harmonic suppression. Background technique [0002] With the rapid development of wireless communication technology, various communication services have emerged in different frequency bands, especially in frequency modulation communication systems such as radar and electronic countermeasures, it is necessary to support multi-band reconfigurable RF front-ends to cover the data of various communication systems transmission. The tunable RF multiplexer is the core key device of the reconfigurable RF front-end, which is responsible for pre-selecting multiple required frequency bands from the crowded spectrum environment. Many scholars have researched and designed duplexers, triplexers, and quadruplexers with different structures, but these devices can ...

AI Technical Summary

Problems solved by technology

However, for an adjustable duplexer, when the channel frequency is adjusted, the input impedance of each channel to the common input port will vary with the frequency, so it is difficult to design such a matching network or common resonator in tuning range such that the common input port matches each channel simultaneously

Therefore, there are few researches and designs on adjustable duplexers at this stage. The disadvantages are: (1) each channel is not absolutely adjustable independently; (2) the isolation is not high during the channel adjustment process; (3) all Many types of DC power supply are required

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