Title :
Low-loss SAW IF filters with new unidirectional IDTs used in digital mobile radios
Author :
Hikita, Masayuki ; Okazaki, Kenjiro
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
Abstract :
A new type of unidirectional IDT having both excitation and reflection electrodes within each section of one wavelength ( lambda 0) was developed. High-performance SAW IF filters used in digital mobile radios with low insertion losses of 3-6 dB at 70 MHz and 3.8 dB at 250 MHz centre frequencies were realised using ST-cut quartz substrates.
Keywords :
digital radio systems; mobile radio systems; surface acoustic wave filters; ultrasonic transducers; 250 MHz; 3.6 dB; 3.8 dB; 70 MHz; SAW IF filters; ST-cut quartz substrates; centre frequencies; digital mobile radios; excitation electrodes; insertion losses; reflection electrodes; unidirectional IDT;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19930991
