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a duplexer

A duplexer and resonator technology, which is applied in the field of semiconductors and micro-electromechanical systems, can solve the problems of limiting the overall performance of the filter, difficult to guarantee the performance of the resonator, and limited adjustable range, etc., to achieve out-of-band suppression and isolation improvement , wide adjustment range, improve the effect of in-band insertion loss

Active Publication Date: 2022-07-12
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 coefficient of the resonator basically depends on the thickness and material parameters of the piezoelectric dielectric layer, which is difficult to adjust on the same filter
The limited range of frequency and piezoelectric coupling coefficient limits the improvement of the overall performance of the filter

Method used

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Embodiment 1

[0049] figure 1 A circuit structure diagram of the duplexer according to the first embodiment of the present application is shown. like figure 1 As shown, a duplexer includes:

[0050] a transmit filter 101, which is connected between the transmit end (TX) and the antenna end (ANT) and includes series resonators and parallel resonators connected in a ladder form; and

[0051] a receive filter 102, which is connected between the receive end (RX) and the antenna end (ANT) and includes series resonators and parallel resonators connected in a trapezoidal form,

[0052] Among them, there are two groups of LWR resonators, one group of transmitting end series LWR resonators 103 are connected in series between the transmitting filter 101 and the antenna end (ANT), the other group receiving end series LWR resonators 104 are connected in series between the receiving filter 102 and the antenna end (ANT) between the antenna terminals (ANT).

[0053]Specifically, the transmitting filte...

Embodiment 2

[0065] Figure 4 A circuit structure diagram of the duplexer according to the second embodiment of the present application is shown. like Figure 4 As shown, a duplexer includes:

[0066] a transmit filter 101, which is connected between the transmit end (TX) and the antenna end (ANT) and includes series resonators and parallel resonators connected in a ladder form; and

[0067] a receive filter 102, which is connected between the receive end (RX) and the antenna end (ANT) and includes series resonators and parallel resonators connected in a trapezoidal form,

[0068] Among them, there are two groups of LWR resonators, and the two groups of LWR resonators 105 and 106 are respectively connected to the parallel branch of any node in the transmitting filter 101 and the receiving filter 102 and are connected to the ground terminal.

[0069] Specifically, the transmitting filter 101 and the receiving filter 102 are both composed of four-stage series resonators and two-stage para...

Embodiment 3

[0081] Figure 7 A circuit structure diagram of the duplexer according to the third embodiment of the present application is shown. like Figure 7 As shown, a duplexer includes:

[0082] a transmit filter 101, which is connected between the transmit end (TX) and the antenna end (ANT) and includes series resonators and parallel resonators connected in a ladder form; and

[0083] a receive filter 102, which is connected between the receive end (RX) and the antenna end (ANT) and includes series resonators and parallel resonators connected in a trapezoidal form,

[0084] Among them, there are four LWR resonators, a group of LWR resonators 103 in series at the transmitting end are connected in series between the transmitting filter 101 and the antenna end (ANT), and a group of LWR resonators 104 in series at the receiving end are connected in series between the receiving filter 102 and the antenna Between the terminals (ANT), a group of parallel LWR resonators 105 at the transmi...

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Abstract

The present invention provides a duplexer, comprising: a transmit filter, which is connected between a transmit end and an antenna end and includes a series resonator and a parallel resonator connected in a ladder form; and a receive filter, so The receiving filter is connected between the receiving end and the antenna end and includes a series resonator and a parallel resonator connected in a trapezoidal form, wherein the LWR resonator is connected on the series branch of the TX or RX or the LWR resonator is connected on the The parallel branch of TX or RX is connected to the ground terminal; this application introduces LWR resonators in the structural design of filters and duplexers and applies them to piezoelectric filters and duplexers to improve piezoelectric filters, The performance of the duplexer, by using the impedance characteristics of the LWR resonant frequency point, flexible frequency and the characteristics of piezoelectric coupling coefficient adjustment, use different combinations of frequencies and piezoelectric coupling coefficients to achieve the required impedance transformation at a specific frequency point. .

Description

technical field [0001] The invention relates to the field of semiconductors and micro-electromechanical systems, in particular to a duplexer. Background technique [0002] With the rapid development of wireless communication systems, the performance requirements of the RF front-end are becoming more and more stringent. And the wireless communication system is developing in the direction of multi-function, multi-band and multi-protocol, which poses higher challenges to the radio frequency front-end in wireless communication equipment. As a very important module in the RF front-end, the performance of the filter duplexer plays a decisive role in the performance of the RF front-end. Therefore, there is a very urgent need for continuous improvement of filter duplexer performance. [0003] In the field of radio frequency communication, Film Bulk Acoustic Wave Resonator (FBAR) has attracted more and more attention due to its small size, high roll-off and low insertion loss, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/70H03H9/15H03H9/205H03H9/02
CPCH03H9/02236H03H9/02244H03H9/15H03H9/205H03H9/70H03H2009/155H03H2009/02251
Inventor 庞慰蔡华林
Owner TIANJIN UNIV
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