The rounded shape spiral transmission line phase shifter for miniaturized SAW W-CDMA antenna duplexers

Osamu Hikino, Masashi Ohki, Seima Kondo, Junichi Hamasaki, Tomohiro Endo, Takashi Shiba, Yuji Fujita, Satoru Murakami

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

2 Citations (Scopus)


The unique structure for phase shifter to duplex Rx and Tx SAWs has introduced. The phase shifter has the rounded shape spiral structure without any crossover. The phase shifter has been implemented in LTCC packages of 3.0×2.5×0.4mm (typical). The phase shifter has very low transmission loss and very low coupling since the phase shifter is almost completely shielded with the ground plate. The simulation result shows that the above mentioned phase shifter has superior insertion loss characteristics than conventional transmission line with meander structure. Using the above explained phase shifter we have fabricated SAW W-CDMA (Wideband Code Division Multiple Access) antenna duplexers for band 2 and band 5. The measurement results of the above duplexers are shown.

Original languageEnglish
Title of host publication2005 IEEE Ultrasonics Symposium
Number of pages4
Publication statusPublished - 2005 Dec 1
Externally publishedYes
Event2005 IEEE Ultrasonics Symposium - Rotterdam, Netherlands
Duration: 2005 Sep 182005 Sep 21

Publication series

NameProceedings - IEEE Ultrasonics Symposium
ISSN (Print)1051-0117


Other2005 IEEE Ultrasonics Symposium


  • Duplexer
  • LTCC
  • Phase shifter
  • SAW
  • W-CDMA

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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