Modified ladder-type 2.4GHz SAW filter with transmission zero

Author

Novgorodov, V. ; Freisleben, S. ; Heide, P. ; Vossiek, M.

fYear

2010

fDate

11-14 Oct. 2010

Firstpage

2083

Lastpage

2086

Abstract

This paper describes the design of 2.4-2.5GHz bandpass ladder-type SAW filter and methods to improve its characteristics. The structure of the filter is based on modified π-type topology with external matching inductors. The piezoelectric crystal (LiTaO₃) is placed on the low temperature co-fired ceramic (LTCC) substrate while all external elements are completely integrated into LTCC. Input sections of the filter with their characteristics were considered in detail what allowed to reduce the degradation of the filter characteristics due to increasing of its bandwidth. An effective way to create a transmission zero by introduction of magnetic coupling between input and output matching coils is presented in the paper.

Keywords

UHF filters; band-pass filters; ceramics; ladder filters; lithium compounds; network topology; piezoelectric materials; surface acoustic wave filters; LiTaO₃; bandpass ladder-type SAW filter; filter characteristics; frequency 2.4 GHz to 2.5 GHz; low temperature cofired ceramic substrate; magnetic coupling; matching coil; matching inductor; modified π-type topology; piezoelectric crystal; transmission zero; Band pass filters; Bandwidth; Capacitance; Coils; Inductance; Resonant frequency; Resonator filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium (IUS), 2010 IEEE

Conference_Location

San Diego, CA

ISSN

1948-5719

Print_ISBN

978-1-4577-0382-9

Type

conf

DOI

10.1109/ULTSYM.2010.5935844

Filename

5935844