Title :
A very small dielectric planar filter for portable telephones
Author :
Ishizaki, T. ; Fujita, M. ; Kagata, H. ; Uwano, T. ; Miyake, H.
Author_Institution :
Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
Abstract :
A high-performance dielectric filter 4.5 mm*3.2 mm*2.0 mm in size has been developed. It has two planar resonators and is made of high-permittivity multilayer ceramic in the Bi-Ca-Nb-O system. The transmission characteristic of the planar filter is found to have a distinctive attenuation pole feature. The behavior of the attenuation pole is explained by the relation between even-odd mode impedances and an equivalent expression with lumped elements.<>
Keywords :
active filters; bismuth compounds; calcium compounds; ceramics; dielectric resonators; mobile radio systems; radio equipment; radiofrequency filters; radiotelephony; BiCaNbO; attenuation pole feature; dielectric planar filter; even-odd mode impedances; high-permittivity multilayer ceramic; lumped elements; portable telephones; transmission characteristic; Attenuation; Capacitors; Coupling circuits; Dielectrics; Electromagnetic coupling; Impedance; Nonhomogeneous media; Resonator filters; Strips; Telephony;
Conference_Titel :
Microwave Symposium Digest, 1993., IEEE MTT-S International
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
0-7803-1209-0
DOI :
10.1109/MWSYM.1993.276916
