Title :
Ultra-Steep Cut-Off Double Mode SAW Filter and Its Application to a PCS Duplexer
Author :
Inoue, Shogo ; Tsutsumi, Jun ; Matsuda, Takashi ; Ueda, Masanori ; Ikata, Osamu ; Satoh, Yoshio
Author_Institution :
Fujitsu Labs. Ltd., Akashi
fDate :
9/1/2007 12:00:00 AM
Abstract :
This paper describes the double mode surface acoustic wave (DMS) filter design techniques for achieving the ultra-steep cut-off characteristics and low insertion loss required for the Rx filter in the personal communications services (PCS) duplexer. Simulations demonstrate that the optimal combination of the additional common ground inductance Lg and the coupling capacitance Cc between the input and output terminals of the DMS filters drastically enhances the skirt steepness and attenuation for the lower frequency side of the passband. Based on this result, we propose a novel DMS filter structure that utilizes the parasitic reactance generated in bonding wires and interdigital transducer (IDT) busbars as Lg and Cc, respectively. Because the proposed structure does not need any additional reactance component, the filter size can be small. Moreover, we propose a compact multiple-connection configuration for low insertion loss. Applying these technologies to the Rx filter, we successfully develop a PCS SAW duplexer.
Keywords :
inductance; interdigital transducers; ladder filters; surface acoustic wave filters; DMS filter structure; PCS duplexer; Rx filter; attenuation; bonding wires; compact multiple-connection configuration; coupling capacitance; double mode surface acoustic wave filter design; ground inductance; insertion loss; interdigital transducer busbars; ladder-type surface acoustic wave filters; parasitic reactance; passband frequency; personal communication services; skirt steepness; ultrasteep cut-off double mode SAW filter; Acoustic waves; Attenuation; Frequency; Inductance; Insertion loss; Parasitic capacitance; Passband; Personal communication networks; SAW filters; Surface acoustic waves; Acoustics; Cellular Phone; Computer Simulation; Computer-Aided Design; Equipment Design; Equipment Failure Analysis; Filtration; Models, Theoretical; Transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2007.472