A Phase Canceling Technique to Improve SAW Duplexer Isolation

Tao, Jianbin; Tang, Zhengjie; Zou, Yali; Wang, Bin; Li, Jiawei; Liu, Yuhao; Wu, Tao

doi:10.3390/mi14020239

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A Phase Canceling Technique to Improve SAW Duplexer Isolation

by

Jianbin Tao

¹,

Zhengjie Tang

²,

Yali Zou

^1,2,

Bin Wang

²,

Jiawei Li

³,

Yuhao Liu

¹ and

Tao Wu

^3,*

¹

School of Microelectronics, Shanghai University, Shanghai 200444, China

²

Changzhou Bowo Microelectronics Co., Ltd., Changzhou 213000, China

³

School of Information Science and Technology, ShanghaiTech University, Shanghai 201210, China

^*

Author to whom correspondence should be addressed.

Micromachines 2023, 14(2), 239; https://doi.org/10.3390/mi14020239

Submission received: 29 November 2022 / Revised: 13 January 2023 / Accepted: 13 January 2023 / Published: 17 January 2023

(This article belongs to the Special Issue Design, Fabrication, Testing of MEMS/NEMS)

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Abstract

Spectrum resources are becoming increasingly crowded, and the isolation interval between different systems is getting smaller and smaller. This puts forward higher requirements for the duplexer. The duplexer is an important part of the radio frequency front end, and the isolation requirement is becoming higher. This paper presents a phase canceling circuit to improve the performance of the duplexer to meet the requirement of the communication system for isolation. A phase canceling circuit is an effective method to enhance the isolation through use of a surface acoustic wave (SAW) on-chip circuit. It contains a duplexer and a branch. The branch is designed for diminishing the leakage signal of the duplexer. Compared with the leakage signal, the branch consists of two attenuators and a phase shifter to generate a signal which has equal extent and reverse phase. As a result, this method is capable of increasing the isolation of band 5 by 12 dB in the downlink frequency. Meanwhile, it neither affects other factors, such as insertion loss or return loss, nor increases the size of the chip. The phase canceling circuit is expected to promote the quality of duplexer to satisfy the strict requirements in 4G and 5G systems.

Keywords: surface acoustic wave; duplexer; isolation

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MDPI and ACS Style

Tao, J.; Tang, Z.; Zou, Y.; Wang, B.; Li, J.; Liu, Y.; Wu, T. A Phase Canceling Technique to Improve SAW Duplexer Isolation. Micromachines 2023, 14, 239. https://doi.org/10.3390/mi14020239

AMA Style

Tao J, Tang Z, Zou Y, Wang B, Li J, Liu Y, Wu T. A Phase Canceling Technique to Improve SAW Duplexer Isolation. Micromachines. 2023; 14(2):239. https://doi.org/10.3390/mi14020239

Chicago/Turabian Style

Tao, Jianbin, Zhengjie Tang, Yali Zou, Bin Wang, Jiawei Li, Yuhao Liu, and Tao Wu. 2023. "A Phase Canceling Technique to Improve SAW Duplexer Isolation" Micromachines 14, no. 2: 239. https://doi.org/10.3390/mi14020239

APA Style

Tao, J., Tang, Z., Zou, Y., Wang, B., Li, J., Liu, Y., & Wu, T. (2023). A Phase Canceling Technique to Improve SAW Duplexer Isolation. Micromachines, 14(2), 239. https://doi.org/10.3390/mi14020239

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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A Phase Canceling Technique to Improve SAW Duplexer Isolation

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