Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1993-04-08
1994-09-20
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333209, 333212, 333135, H01P 1208
Patent
active
053493168
ABSTRACT:
A two port dual bandpass microwave filter consisting of "n" resonant cavities. Each cavity resonates in two independent modes at displaced frequencies so that the filter has two passbands in a desired frequency band. By orienting an incoming waveguide at an angle with respect to the filter, both TE and TM modes can be excited to produce two separate passbands. The passbands may have either equal or unequal characteristics. Fine tuning of the TE and TM modes is accomplished using tuning plungers or tuning screws. The dual bandpass response of the new filter is achieved by utilizing the TE.sub.1,1,1 and TM.sub.0,1,0 modes in right circular cylindrical cavities, or equivalent modes in rectangular, or other cavities. These modes are orthogonal so they do not couple to each other. The cavity loaded Qs are independently adjustable, so the two passbands can have the same or different bandwidths, the same or different amplitude ripples and the same or different phase responses. The dual bandpass microwave filter provides filtering with but one set of cavity resonators rather than two. It does not require three port microwave junctions with critical path lengths. The filter is well-suited to filter the output of a single transmitter capable of operation at two differential frequencies.
REFERENCES:
patent: 2890421 (1959-06-01), Currie
patent: 3697898 (1972-10-01), Blachier et al.
patent: 5012211 (1991-04-01), Young et al.
By: A. E. Atia and A. E. Williams; "Nonminimum-Phase Optimum-Amplitude Bandpass Waveguide Filers", Apr. 4, 1974, pp. 425-431.
By: D. A. Taggart and R. D. Wanselow; "Mixed Mode Filters", Oct. 10, 1974, pp. 898-902.
By: A. E. Williams and A. E. Atia; "Dual Mode Canonical Waveguide Filters", Dec. 12, 1977, pp. 1021-1026.
By: U. Rosenberg and D. Wolk; "Filter Design Using In-Line Triple-Mode Cavities and Novel Iris Couplings", Dec. 12, 1989, pp. 2011-2019.
Ham Seungsook
ITT Corporation
Peterson Thomas L.
Plevy Arthur L.
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