Title :
A new circuit configuration to obtain large attenuation with a coupled-resonator band elimination filter using laminated LTCC
Author :
Miyake, H. ; Kitazawa, S. ; Ishizaki, T. ; Tsuchiyama, M. ; Ogawa, K. ; Awai, I.
Author_Institution :
Matsushita Nittoh Electr. Co. Ltd., Kyoto, Japan
Abstract :
A new circuit configurations of Band Elimination Filter (BEF) has been invented to recover the attenuation, which was degraded due to the coupling between resonators. The technique of forming an attenuation pole with the laminated planar filter was applied to suppress the influence of coupling. The simulation and the experimental results show that a large attenuation can be obtained by this new configuration. Thus, the very compact BEF´s are realized with laminated Low Temperature Cofired Ceramics (LTCC). They are very suitable for next-generation portable telephones.
Keywords :
UHF filters; band-stop filters; ceramics; laminates; microstrip filters; microstrip resonators; passive filters; poles and zeros; resonator filters; 2 GHz; attenuation pole; circuit configuration; coupled-resonator band elimination filter; laminated LTCC; laminated planar filter; low temperature cofired ceramics; portable telephone application; Attenuation; Band pass filters; Capacitors; Ceramics; Coupling circuits; Degradation; Resonator filters; Strips; Telephony; Temperature;
Conference_Titel :
Microwave Symposium Digest. 2000 IEEE MTT-S International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-5687-X
DOI :
10.1109/MWSYM.2000.860937
