Duplexer and communication device
By setting functional units, such as interdigitated capacitor structures or impedance element filters with shared busbars, in the blank areas of the CRF structure, and adjusting the electrode finger arrangement and phase difference, the problems of out-of-band suppression and isolation degradation caused by the side-by-side arrangement of CRF and IEF structures are solved, thus achieving high performance and miniaturization of the duplexer.
CN121887150APending Publication Date: 2026-04-17MAXSCEND MICROELECTRONICS CO LTD
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Patent Information
- Application Number
- CN202512058856.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-04-17
AI Technical Summary
Technical Problem
In duplexers, the side-by-side arrangement of CRF and IEF structures leads to problems with near-band out-of-band suppression and isolation degradation.
Method used
Functional units, such as interdigitated capacitor structures or impedance element filters with shared busbars, can be placed in the blank areas of the CRF structure. By adjusting the arrangement direction and phase difference of the electrode fingers, the coupling effect of acoustic wave energy can be reduced.
Benefits of technology
It improves near-band out-of-band suppression and isolation, maintains duplexer performance, and makes full use of the layout area to avoid performance degradation caused by mutual coupling of acoustic wave energy.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention relates to the technical field of filters, and discloses a duplexer and a communication device.The duplexer comprises a sending filter and a receiving filter, and at least one of the sending filter and the receiving filter comprises a coupling resonant filter, at least one first impedance element filter and a functional unit, the coupling resonant filter comprises a plurality of first resonators arranged along a first direction; the at least one first impedance element filter is arranged on at least one side of the coupled resonant filter in the second direction, and a blank area exists on at least one side of the coupled resonant filter in the first direction; the functional unit is located in the blank area, and the functional unit is electrically connected with at least one of the coupling resonance filter and the first impedance element filter. According to the invention, by arranging the function unit, the available area on the layout can be fully utilized, the influence caused by mutual coupling of sound wave energy between the coupling resonant filter and the function unit which are arranged side by side can be avoided, and the out-of-band rejection and the isolation degree can be improved.
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