Microwave filter with U-type resonator

Details Microwave filter with U-type resonator Microwave filter with U-type resonator

1998-08-21

2000-04-25

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333222, H01P 1205, H01P 704

Patent

active

060549092

ABSTRACT:
The present invention relates to a microwave filter, having U-type resonators, which passes a desired frequency signal and removes an undesired frequency signal when used in a high frequency antenna circuit for wireless communication systems. In accordance with the trend of reducing communication system terminals, it is required to reduce a high frequency filter. The high frequency filter is required to attenuate signals very sharply at the stop band especially near to a passband transmitting and receiving frequency, so as to improve the efficiency of the frequency. The filter may be reduced in weight by forming U-type resonators instead of straight-type resonators. Excellent attenuation characteristics may be achieved at the stop band lower than the passband, using the difference of the characteristic impedance between the open end portion and the shorted portion of the resonator by forming the coupling control grooves at the outer walls of the dielectric block.

REFERENCES:
patent: 4431977 (1984-02-01), Sokola et al.
patent: 4733208 (1988-03-01), Ishikawa et al.
patent: 5208565 (1993-05-01), Sogo et al.
patent: 5602518 (1997-02-01), Clifford, Jr. et al.
Miniaturized Antenna Duplexers for Portable Radio Telephone Terminals; Morikazu Sagawa, Mitsuo Makimoto, Kazuhiro Eguchi and Fumio Fukushima; 1990; pp. 417-420.
A Stepped Impedance Comb-Line Filter Fabricated By Using Ceramic Lamination Technique; Toshio Ishizaki and Tomoki Uwano; 1994; pp. 617-620.
A Miniaturized Dielectric Monoblockband-Pass Filter For 800MHz Band Cordless Telephone System; Haruo Matsumoto, Hiromi Ogura and Toshio Nishikawa; 1994; pp. 249-252.

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