SPUDT/in-line coupled resonator filters

Author

Almar, R. ; Horine, Bryce ; Hoffman, Ryan

Author_Institution

Sawtek Inc., Orlando, FL

fYear

1993

fDate

31 Oct-3 Nov 1993

Firstpage

25

Abstract

This paper presents results obtained for 71 MHz filters designed and implemented using a combination of single phase unidirectional transducers (SPUDT) and in-line coupled resonators (RFI). For simplicity the device will be referred to as a SPUDT-RFI. This approach is ideally suited for cases in which low price and small size are important considerations. A typical example is the application of these filters in GSM cellular telephones. The design and implementation of these filters is very challenging, since they require very thick layers of aluminum to provide the required reflectivity and bandwidth in a small space. A technique that involves the use of multi-level metallization to optimize both the SPUDT and the resonator will also be presented

Keywords

acoustic resonators; cellular radio; piezoelectric transducers; surface acoustic wave filters; ultrasonic transducers; 71 MHz; Al; GSM cellular telephones; SPUDT-RFI; SPUDT/in-line coupled resonator filters; bandwidth; multi-level metallization; reflectivity; single phase unidirectional transducers; Aluminum; Bandwidth; GSM; Narrowband; Predictive models; Reflectivity; Resonator filters; Strips; Telephony; Transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1993. Proceedings., IEEE 1993

Conference_Location

Baltimore, MD

Print_ISBN

0-7803-2012-3

Type

conf

DOI

10.1109/ULTSYM.1993.339708

Filename

339708