Title :
A wide-band balanced SAW filter with longitudinal multi-mode resonator
Author :
Koshino, Masayoshi ; Kanasaki, K. ; Akahori, N. ; Kawase, M. ; Chujyo, R. ; Ebata, Y.
Author_Institution :
DDC Co., Toshiba Corp., Yokohama, Japan
Abstract :
This paper describes a new balanced SAW filter with wide fractional bandwidth over 5% in 1.8 GHz range. The developed SAW filter is utilizing 5IDT longitudinally coupled multi-mode resonator structure with inverted output IDTs. In order to obtain wide bandwidth, mode coupling conditions were studied. Fabricated SAW filter has been realized with 100 MHz bandwidth and low insertion loss of 2 dB successfully. The package size of the filter is very small such as 2.5×2.0×1.0 mm3 with flip-chip bonding technology. This SAW filter enables one to eliminate balun coil, which contributes to reduce mobile portable phone size
Keywords :
cellular radio; digital radio; flip-chip devices; integrated circuit packaging; interdigital transducers; surface acoustic wave resonator filters; telephone sets; 1.8 GHz; 100 MHz; 5IDT longitudinally coupled multi-mode resonator structure; flip-chip bonding technology; insertion loss; inverted output IDTs; longitudinal multi-mode resonator; mobile portable phone size; mode coupling conditions; package size; wideband balanced SAW filter; Bandwidth; Circuits; Distributed control; Electrodes; Impedance; Resonance; Resonant frequency; Resonator filters; SAW filters; Wideband;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.922579
