Title :
A very small dielectric planar filter for portable telephones
Author :
Ishizaki, Toshio ; Fujita, Mitsuhioro ; Kagata, Hiroshi ; Uwano, Tomoki ; Miyake, Hideyuki
Author_Institution :
Components & Devices Res. Center, Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
fDate :
11/1/1994 12:00:00 AM
Abstract :
A high performance, high-dielectric stripline filter with the size of 4.5 mm×3.2 mm×2.0 mm has been developed. The filter consists of planar resonators and its structure is made of high permittivity multilayer ceramic in the Bi-Ca-Nb-O system. The performance is distinctive with its attenuation pole. An equivalent lumped circuit is derived to explain the behavior of the attenuation pole quantitatively. A precise design procedure is also described
Keywords :
UHF filters; cellular radio; ceramics; cordless telephone systems; equivalent circuits; passive filters; resonator filters; strip line filters; 1.2 GHz; 2 mm; 3.2 mm; 4.5 mm; 800 MHz; 950 MHz; Bi-Ca-Nb-O; MLC type; UHF band; attenuation pole; design procedure; dielectric planar filter; equivalent lumped circuit; high permittivity multilayer ceramic; planar resonators; portable telephones; radiotelephony; stripline filter; Attenuation; Band pass filters; Capacitors; Ceramics; Dielectrics; Nonhomogeneous media; Permittivity; Resonator filters; Stripline; Telephony;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
