TY - GEN
T1 - A design technique to enhance isolation of duplexer in single-ended and differential modes
AU - Tsutsumi, J.
AU - Inoue, S.
AU - Iwaki, M.
AU - Hara, Motoaki
AU - Nakamura, H.
AU - Matsumoto, K.
AU - Ueda, M.
AU - Satoh, Y.
PY - 2011/12/1
Y1 - 2011/12/1
N2 - 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.
AB - 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.
KW - Duplexer
KW - FBAR
KW - SAW
UR - http://www.scopus.com/inward/record.url?scp=84869059025&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84869059025&partnerID=8YFLogxK
U2 - 10.1109/ULTSYM.2011.0458
DO - 10.1109/ULTSYM.2011.0458
M3 - Conference contribution
AN - SCOPUS:84869059025
SN - 9781457712531
T3 - IEEE International Ultrasonics Symposium, IUS
SP - 1833
EP - 1836
BT - 2011 IEEE International Ultrasonics Symposium, IUS 2011
T2 - 2011 IEEE International Ultrasonics Symposium, IUS 2011
Y2 - 18 October 2011 through 21 October 2011
ER -