Title :
Extremely low-loss SAW filter and its application to antenna duplexer for the 1.9 GHz PCS full-band
Author :
Tsutsumi, Jun ; Inoue, Shogo ; Iwamoto, Yasuhide ; Matsuda, Takashi ; Miura, Michio ; Satoh, Yoshio ; Ueda, Masanori ; Ikata, Osamu
Author_Institution :
Fujitsu Labs. Ltd., Akashi, Japan
Abstract :
An antenna duplexer for the 1.9 GHz PCS-band handsets is realized by developing extremely low-loss and ultra-steep cut-off SAW filters. In this paper, design techniques to achieve the characteristics that satisfy all severe specifications required for the PCS-band duplexer is presented. Developed SAW duplexers have the insertion loss of -2.0 dB and -3.2 dB in the Tx and Rx band, respectively. Also, the attenuation levels are -53 dB and -45 dB. The device size is as small as 5×5×1.5 mm3. These performances are sufficient for the PCS duplexer to be practical.
Keywords :
antenna accessories; mobile handsets; personal communication networks; surface acoustic wave resonator filters; -2 dB; -3.2 dB; 1.9 GHz; PCS band duplexer; PCS band handset; SAW duplexer; SAW filter; antenna duplexer; insertion loss; personal communication system; Energy loss; Film bulk acoustic resonators; Frequency; Insertion loss; Metallization; Personal communication networks; Resonance; SAW filters; Surface acoustic waves; Tellurium;
Conference_Titel :
Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 2003. Proceedings of the 2003 IEEE International
Print_ISBN :
0-7803-7688-9
DOI :
10.1109/FREQ.2003.1275203
