Small size 2.4 GHz ISM-band LTCC filters with transmission zeros

Author

Gavela, I. ; Falagán, M.A. ; Stadler, M.

Author_Institution

Epcos OHG, Deutschlandsberg, Austria

Volume

1

fYear

2005

fDate

4-6 Oct. 2005

Abstract

In this paper the theory of bandpass filters based on parallel resonators coupled by means of admittance inverters and further enhanced with cascade triplets (CT) is applied to the design of small size filters in LTCC technology. The parasitic coupling between stripline resonators is analyzed in detail and used to introduce transmission zeros in the filter response. Two realizations for the 2.4 GHz ISM-band are presented. Thanks to the introduction of transmission zeros, the filters show good attenuation at the GSM, PCS and WCDMA bands, which enables their use in ISM transceivers integrated in cellular phones.

Keywords

band-pass filters; cellular radio; ceramics; microwave filters; poles and zeros; strip line resonators; transmission lines; 2.4 GHz; GSM; ISM band; LTCC filters; LTCC technology; PCS band; WCDMA bands; admittance inverters; bandpass filters; cellular phones; parallel resonators; parasitic coupling; stripline resonators; transceivers; transmission zeros; Admittance; Attenuation; Band pass filters; Couplings; Filtering theory; GSM; Inverters; Personal communication networks; Resonator filters; Stripline;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2005 European

Print_ISBN

2-9600551-2-8

Type

conf

DOI

10.1109/EUMC.2005.1608948

Filename

1608948