Duplexer

A duplexer and resonator technology, applied in the field of semiconductors and micro-electromechanical systems, can solve the problems of difficult to guarantee the performance of the resonator, limit the overall performance of the filter, limited adjustable range, etc. Effects of out-of-band rejection and isolation improvement, improved in-band insertion loss and return performance

Active Publication Date: 2019-07-30
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the frequency of the resonator in the FBAR filter is achieved by adjusting the thickness of the physical layer, the adjustable range is limited, and the performance of the resonator is difficult to guarantee when the adjustment range is too wide
In addition, the piezoelectric coupling coeffi

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0058] figure 1 A circuit structure diagram of the duplexer according to the first embodiment of the present application is shown. Such as figure 1 As shown, a duplexer includes:

[0059] a transmit filter 101 connected between a transmit terminal (TX) and an antenna terminal (ANT) and including series resonators and parallel resonators connected in a trapezoidal form; and

[0060] a receiving filter 102 connected between a receiving terminal (RX) and the antenna terminal (ANT) and comprising series resonators and parallel resonators connected in a trapezoidal form,

[0061] Among them, there are three groups of LWR resonators, one group of LWR resonators 103 and parasitic inductance 104 are connected in series between the transmitting filter 101 and the transmitting end (TX), and one group of LWR resonators 105 and parasitic inductance 106 are connected in series in receiving filter 102 Between the receiving end (RX), a group of LWR resonators 107 and parasitic inductance 108

Embodiment 2

[0079] Figure 5 A circuit structure diagram of a duplexer according to the second embodiment of the present application is shown. Such as Figure 5 As shown, a duplexer includes:

[0080] a transmit filter 101 connected between a transmit terminal (TX) and an antenna terminal (ANT) and including series resonators and parallel resonators connected in a trapezoidal form; and

[0081] a receiving filter 102 connected between a receiving terminal (RX) and the antenna terminal (ANT) and comprising series resonators and parallel resonators connected in a trapezoidal form,

[0082] Wherein, there are two groups of LWR resonators, one group of LWR resonators 109 and parasitic inductance 110 are connected in series between the parallel resonators near the antenna end (ANT) of the transmitting filter 101 and the ground terminal, and the other group of LWR resonators 111 and The parasitic inductance 112 is connected in series between the parallel resonator near the antenna end (ANT) of

Embodiment 3

[0095] Figure 8 A circuit structure diagram of a duplexer according to the third embodiment of the present application is shown. Such as Figure 8 As shown, a duplexer includes:

[0096] a transmit filter 101 connected between a transmit terminal (TX) and an antenna terminal (ANT) and including series resonators and parallel resonators connected in a trapezoidal form; and

[0097] a receiving filter 102 connected between a receiving terminal (RX) and the antenna terminal (ANT) and comprising series resonators and parallel resonators connected in a trapezoidal form,

[0098] Wherein, the LWR resonators are two groups, one group of LWR resonators 113 and the parasitic inductance 114 are connected in series on the parallel road drawn by the parallel resonators near the antenna end (ANT) of the transmitting filter 101, and the other group of LWR resonators 115 and the parasitic inductance The inductance 116 is connected in series on the parallel path drawn from the parallel reson

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PUM

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Abstract

The invention provides a duplexer which is characterized by comprising a transmitting filter which is connected between a transmitting end and an antenna end and comprises a series resonator and a parallel resonator which are connected in a trapezoid form; and a reception filter, wherein the receiving filter is connected between the receiving end and the antenna end and comprises a series resonator and a parallel resonator which are connected in a trapezoid mode, wherein the LWR resonator and the parasitic inductor are connected to a series branch of the transmitting end, the receiving end orthe antenna end in series, and the parasitic inductor is close to one side of the transmitting end, the receiving end or the antenna end. According to the present invention, the LWR Lamb wave resonator is introduced into the design of the filter and the duplexer, so that the parasitic inductance exists on the signal connecting line, the parasitic inductance can be counteracted through the series connection of the LWR, and the matching and the insertion loss are improved.

Description

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Claims

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Application Information

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Owner TIANJIN UNIV
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