Signal transmission line, duplexer, multiplexer and communication equipment

Abstract

The invention discloses a signal transmission line, a duplexer, a multiplexer and communication equipment. The duplexer comprises an antenna, a transmitting filter, a receiving filter and an impedanceconverter, wherein the transmitting filter and the receiving filter are formed on the basis of acoustic resonators, and the impedance converter is the signal transmission line. The head end of a first metal signal line layer of the signal transmission line is connected with the antenna, and the tail end of the second metal signal line layer of the signal transmission line is connected with the antenna end of the receiving filter or the transmitting filter. According to the technical scheme, the signal transmission line has high characteristic impedance, impedance conversion is achieved in theduplexer design, meanwhile, the electrical length of the needed transmission line is shortened, the space occupied by the transmission line is reduced, and miniaturization design of devices is facilitated. In addition, an electromagnetic coupling path exists between the signal transmission line and a coupling unit in the receiving filter and / or the transmitting filter, and the out-of-band rejection characteristic and the isolation characteristic of the corresponding frequency band can be improved by adjusting the coupling mode and the coupling strength of the electromagnetic coupling path.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a signal transmission line, a duplexer, a multiplexer and communication equipment. Background technique [0002] In recent years, the miniaturization and high-performance trend of communication equipment has accelerated, which poses higher challenges to the RF front-end. In the RF communication front end, on the one hand, miniaturization is achieved by reducing the size of the chip and package substrate, and on the other hand, better performance is achieved by reducing loss sources and better resonator matching design. In the existing filter structure, there are many passive components for matching, and at the same time, it is necessary to introduce more inductance, capacitance, coupling and other structures to improve specific performance such as roll-off insertion loss. [0003] A typical structure of an ordinary filter is as figure 1 as shown, figure 1 is a schematic diagra...

AI Technical Summary

Problems solved by technology

[0007] Although the above method achieves the purpose of improving the out-of-band suppression characteristics and isolation characteristics of the duplexer, the capacitor needs to be implemented by additionally setting interdigitated capacitors on the chip, which will inevitably lead to an increase in the size of the filter circuit, and includes this The problem of increasing the size of the high-frequency module of the filter circuit

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