Title :
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
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;
Conference_Titel :
Microwave Conference, 2005 European
Print_ISBN :
2-9600551-2-8
DOI :
10.1109/EUMC.2005.1608948
