Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1978-08-31
1981-05-05
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333203, 333246, H01P 1203, H01P 1205, H01P 1100
Patent
active
042662060
ABSTRACT:
Stripline filters and the like have one or more elongated resonator conductors positioned on a dielectric substrate which is backed by a ground plane conductor, with the response frequency being dependent primarily on the length of the resonator. A wide apron conductor is connected to the grounded end of the resonator and to the ground planes. The resonator and apron can be formed by use of a mask such that errors in alignment of the mask do not change the length of the resonator or the point of connection to the grounding apron. The apron, because of its width, has low transmission line impedance to the ground plane which is not changed by changes in configuration or position of the mask, so that it effectively grounds the resonator at the end thereof connected to the apron. A second dielectric substrate backed by a ground plane conductor may be placed on the resonator conductor. The filter may have a plurality of resonators connected to grounding aprons, and a plurality of resonators can be connected to the same apron. In this case it may be desired to place a notch or cut-out in the apron between the connection of the resonators thereto, to interrupt spurious couplings between such resonators through the apron.
REFERENCES:
patent: 3327255 (1967-06-01), Bolljahn et al.
patent: 3451015 (1969-06-01), Heath
patent: 3534301 (1970-10-01), Golembeski
patent: 3805198 (1974-04-01), Gewartowski et al.
patent: 4129842 (1978-12-01), Torii et al.
Milligan, "Dimensions of Microstrip Coupled Lines & Interdigital Structures", IEEE Trans MTT, May 1977, pp. 405-410.
Fjerstad, "Synchronously Tunable Multisection, Narrowband Rejection Filters", The Microwave Journal, Oct. 1965, pp. 36-40.
Cristal, "Tapped-Line Coupled Transmission Lines with Appl. to Interdigital & Combline Filters", IEEE Trans MTT, Dec. 1975, pp. 1007-1012.
Bedard Brian E.
Boman Bertho K.
Gillman James W.
Motorola Inc.
Nussbaum Marvin L.
Southard Donald B.
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