A design technique to enhance isolation of duplexer in single-ended and differential modes

J. Tsutsumi, S. Inoue, M. Iwaki, Motoaki Hara, H. Nakamura, K. Matsumoto, M. Ueda, Y. Satoh

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    11 Citations (Scopus)

    Abstract

    This paper describes a design technique to enhance isolation of acoustic duplexers in the single-ended and the differential modes for a so-called "inter-stage SAW-less" radio frequency (RF) front-end of cellular phones. The leakage signal from the Tx to the Rx ports existing inside the duplexer, which degrades the isolation characteristics, is cancelled out by utilizing a proposed circuit topology and by performing careful design of the whole duplexer structure. The principle directly enhances the single-ended isolation, but it also contributes to improve the differential mode isolation. The prototypes for the single-ended and differential duplexers exhibit isolation higher than 70 dB and 65 dB, respectively, in the Tx band for UMTS Band 1 application.

    Original languageEnglish
    Title of host publication2011 IEEE International Ultrasonics Symposium, IUS 2011
    Pages1833-1836
    Number of pages4
    DOIs
    Publication statusPublished - 2011 Dec 1
    Event2011 IEEE International Ultrasonics Symposium, IUS 2011 - Orlando, FL, United States
    Duration: 2011 Oct 182011 Oct 21

    Publication series

    NameIEEE International Ultrasonics Symposium, IUS
    ISSN (Print)1948-5719
    ISSN (Electronic)1948-5727

    Other

    Other2011 IEEE International Ultrasonics Symposium, IUS 2011
    CountryUnited States
    CityOrlando, FL
    Period11/10/1811/10/21

    Keywords

    • Duplexer
    • FBAR
    • SAW

    ASJC Scopus subject areas

    • Acoustics and Ultrasonics

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