Title :
Small-sized 71 MHz GSM-IF filter using SAW resonator on Li2 B4O7 substrate
Author :
Ichikawa, S. ; Ebata, Y. ; Koshino, M. ; Mishima, N.
Author_Institution :
Toshiba Corp., Yokohama, Japan
Abstract :
A small package size and low loss filter for GSM-IF have been developed with SAW resonators on LBO substrate. For realizing low loss of about 43 dB and very steep slope over 50 dB at +/-700 kHz offset from center frequency, the filter is composed of 4-pole resonator filter which consists of two cascaded IDT type DMS resonator filters. Each DMS filter is a longitudinally coupled resonator and uses withdrawn electrode technique of the IDT attached to suppress the spurious response. The filter is mounted in 9.1×48 mm ceramics package even for 71 MHz
Keywords :
VHF filters; cellular radio; interdigital transducers; surface acoustic wave resonator filters; 4.3 dB; 71 MHz; GSM-IF filter; IDT type DMS resonator filters; Li2B4O7; SAW resonator; four-pole resonator filter; longitudinally coupled resonator; loss; package size; spurious response; withdrawn electrode technique; Resonator filters; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.762096
