Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1993-12-27
1995-08-15
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333246, H01P 1203
Patent
active
054423309
ABSTRACT:
Microwave parallel coupled line filters with direct taps having improved rejection of undesired signals near the pass-band are disclosed. Improved rejection is achieved by controlling the transmission zeros created by the input and output direct taps. Performance is comparable to parallel coupled line filters having substantially more coupling sections. The method involves shifting the transmission zeros by changing the position of the direct taps along the resonator or changing the impedance of the open-circuited stub associated with each tap. Impedance transformers can be used to match back to the source and load impedances.
REFERENCES:
patent: 3451015 (1969-06-01), Heath
patent: 3745489 (1973-07-01), Cristal et al.
patent: 4851797 (1989-07-01), Nakamura
patent: 5136269 (1992-08-01), Seitzer et al.
patent: 5187459 (1993-02-01), Russell et al.
Cohn, "Parallel-Coupled Transmission-Line-Resonator Filters", IRE Trans. on Microwave Theory & Techniques, 1958, pp. 223-231.
An article entitled "Microstrip Tapped-Line Filter Design", by Joseph S. Wong, Member IEEE from IEEE Transactions on Microwave Theory and Techniques, vol. MTT-27, No. 1, Jan. 1979, pp. 44-50.
Fuller Ronald D.
Malone Hugh R.
Gorrie Gregory J.
Ham Seungsook
Motorola Inc.
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