Laminated dielectric resonator and dielectric filter

Details Laminated dielectric resonator and dielectric filter Laminated dielectric resonator and dielectric filter

1995-09-22

1997-08-05

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333202, 333219, H01P 120

Patent

active

056546815

ABSTRACT:
In a laminated dielectric resonator, twomo strip line is formed and resonant frequency is lowered. Accordingly, the length of the resonator is reduced, and the length of the strip line becomes shorter than one fourth of the wavelength with the lowered resonant frequency, which leads to further reduction of the length of the resonator. By lowering the resonant frequency, dielectric material with less relative permittivity can be used, with a result of resonator with high unloaded Q and excellent temperature characteristic. Further, at least one coupling electrode is formed as external or internal electrode to compose a capacitor together with a second strip line, and a laminated dielectric resonator is connected to an external circuit via the coupling electrode. A dielectric filter such as band pass filter, band elimination filter is so composed that the dielectric resonators are cascade-connected to one another. In the thus constructed dielectric filter, external coupling capacitors are unnecessary, reducing the number of parts and facilitating the manufacturing process. Thus, a small-sized, low-cost dielectric filter is attained.

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Nishikawa, Toshio, RF Front End Circuit Components Miniaturized Using Dielectric Resonators for Cellular Portable Telephones, vol. E. 74, No. 6, Jun. 1991.
Kagata, Hiroshi et al., Low-Fire Microwave Dielectric Ceramics and Multilayer Devices With Silver Internal Electrode, vol. 32, 1993.

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