Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1997-11-28
1999-03-09
Wong, Don
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333219, H01P 1203, H01P 708
Patent
active
058806563
ABSTRACT:
A strip-line filter is provided with upper- and lower-stage resonators having the same electromagnetic characteristics. Each of the resonators has a one-wavelength square-shaped strip line and four open-end transmission lines connected to four coupling points A,C,B and D (or E,G,F and H) of each resonator which are spaced 90 degrees in electric length in that order. The square-shaped strip lines have a pair of parallel coupling lines closely placed in parallel to each other to electromagnetically couple the resonators. Therefore, the filter can be manufactured in a small size. A first microwave resonated in each resonator is electromagnetically influenced by two open-end transmission lines connected to two coupling points A and B (or E and F), and a second microwave resonated in each resonator is electromagnetically influenced by two open-end transmission lines connected to two coupling points C and D (or G and H). Therefore, resonance wavelengths of the microwaves can be longer than a line length of each square-shaped strip line. Also, the resonance wavelengths can be adjusted by trimming the transmission lines. Also, because all constitutional elements are made of strip lines, the filter can be made plane.
REFERENCES:
patent: 5017897 (1991-05-01), Ooi et al.
Makimoto Mitsuo
Matsuo Michiaki
Sagawa Morikazu
Yabuki Hiroyuki
Matsushita Electric Industrial Co.,Ltd.
Vu David H.
Wong Don
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