Duplexer

A duplexer and resonator technology, which is applied in the field of semiconductors and micro-electromechanical systems, can solve the problems that the performance of resonators is difficult to guarantee, difficult to adjust, and limit the overall performance of filters, etc., and achieve the effect of wide adjustment range

Active Publication Date: 2019-05-24
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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Examples

Experimental program
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Effect test

Embodiment 1

[0057] figure 1 A block diagram of the duplexer of the first embodiment of the present application is shown. like figure 1 As shown, a duplexer includes:

[0058] a transmit filter 101 connected between the transmit end 105 and the antenna end 107 and comprising series resonators and parallel resonators connected in a ladder form; and

[0059] A receiving filter 102, the receiving filter 102 is connected between the receiving end 106 and the antenna end 107,

[0060] Wherein, the transmitting end 105 and the receiving end 106 respectively lead out a branch to the grounding end, and the LWR resonator 104 and the passive device 103 are connected in series in the branch.

[0061] Wherein, each passive device 103 may be a capacitor, an inductor or a resonator. The structure of the passive device 103 can be T-type, pi-type and L-type structures.

[0062] The above-mentioned duplexer adds an LWR resonator channel between the transmitting end 105 and the receiving end 106, where...

Embodiment 2

[0091] Figure 7 A block diagram of the duplexer of the second embodiment of the present application is shown. like Figure 7 As shown, a duplexer includes:

[0092] a transmit filter 101 connected between the transmit end 105 and the antenna end 107 and comprising series resonators and parallel resonators connected in a ladder form; and

[0093] A receiving filter 102, the receiving filter 102 is connected between the receiving end 106 and the antenna end 107,

[0094] Wherein, the transmitting terminal 105 leads out a branch to the ground terminal, and the LWR resonator 104 and the passive device 103 are connected in series in the branch.

[0095] Wherein, each passive device 103 may be a capacitor, an inductor or a resonator. The structure of the passive device 103 can be T-type, pi-type and L-type structures.

[0096] Figure 8 A circuit structure diagram of the duplexer according to the second embodiment of the present application is shown. like Figure 8 As shown...

Embodiment 3

[0105] Figure 11 A block diagram of the duplexer of the third embodiment of the present application is shown. like Figure 11 As shown, a duplexer includes:

[0106] a transmit filter 101 connected between the transmit end 105 and the antenna end 107 and comprising series resonators and parallel resonators connected in a ladder form; and

[0107] A receiving filter 102, the receiving filter 102 is connected between the receiving end 106 and the antenna end 107,

[0108] The receiving end 106 leads out a branch to the ground end, and the LWR resonator 104 and the passive device 103 are connected in series in the branch.

[0109] Wherein, each passive device 103 may be a capacitor, an inductor or a resonator. The structure of the passive device 103 can be T-type, pi-type and L-type structures.

[0110] Figure 12 A circuit structure diagram of a duplexer according to the third embodiment of the present application is shown. like Figure 12 As shown, a duplexer includes:...

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Abstract

The present invention provides a duplexer comprising: a transmit filter connected between a transmit terminal and an antenna terminal and comprising a series resonator and a parallel resonator connected in a trapezoidal manner; The receiving filter is connected between the receiving end and the antenna end, the transmitting end, the receiving end and the antenna end or the transmitting end and thereceiving end respectively lead out a branch to the grounding end, and the LWR resonator and the passive device are connected in the branch in series; According to the invention, the LWR resonator isintroduced into the structural design of the filter and the duplexer and is applied to the piezoelectric filter; The structure of the diplexer is used for improving the performance of a piezoelectricfilter and the performance of the diplexer, and required impedance conversion is realized at a specific frequency point by utilizing the impedance characteristic of an LWR resonant frequency point, the characteristic of flexible frequency and the characteristic of piezoelectric coupling coefficient adjustment and adopting the combination of different frequencies and piezoelectric coupling coefficients.

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 Applications(China)
IPC IPC(8): H03H7/46H04B1/04
Inventor 庞慰蔡华林
Owner TIANJIN UNIV
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