Microwave filter having means for capacitive interstage coupling between transmission lines
First Claim
1. A microwave filter having a conductive casing with top and bottom walls and opposed pairs of side and end walls, comprising within said casing:
- a dielectric member extending parallel with said side walls;
a plurality of conductive regions arranged on said dielectric member so that each conductive region is capacitively coupled with an adjacent conductive region;
a plurality of parallel transmission lines successively arranged between said end walls and spaced from said top and bottom walls, each being electrically connected at one end to one of said walls and supported at the other end by said dielectric member in electrical contact with a respective one of said conductive regions;
means for injecting microwave energy through one of said end walls and withdrawing microwave energy through the other end wall; and
a plurality of shielding members each being disposed between adjacent ones of said transmission lines to prevent microwave energy propagating along each of said transmission lines from coupling with an adjacent transmission line.
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Accused Products
Abstract
A microwave filter comprising within a conductive casing, a plurality of resonant transmission lines arranged parallel between opposed end walls of the casing, a plurality of shielding members each located between adjacent transmission lines, and a capacitive interstage coupling member disposed transverse to the transmission line. The interstage coupling member comprises a dielectric member and a plurality of conductive regions arranged successively thereon so as to establish capacitive coupling between adjacent conductive regions. Each transmission line is connected at one end to a side wall of the casing and supported at the other end by the dielectric member in electrical contact with a respective one of the conductive regions, whereby the interstage coupling between the transmission lines is provided by the capacitively coupled conductive regions.
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Citations
17 Claims
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1. A microwave filter having a conductive casing with top and bottom walls and opposed pairs of side and end walls, comprising within said casing:
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a dielectric member extending parallel with said side walls; a plurality of conductive regions arranged on said dielectric member so that each conductive region is capacitively coupled with an adjacent conductive region; a plurality of parallel transmission lines successively arranged between said end walls and spaced from said top and bottom walls, each being electrically connected at one end to one of said walls and supported at the other end by said dielectric member in electrical contact with a respective one of said conductive regions; means for injecting microwave energy through one of said end walls and withdrawing microwave energy through the other end wall; and a plurality of shielding members each being disposed between adjacent ones of said transmission lines to prevent microwave energy propagating along each of said transmission lines from coupling with an adjacent transmission line. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A microwave bandpass filter having a conductive casing with top and bottom walls and opposed pairs of side and end walls, comprising within said casing:
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a dielectric member extending parallel with said side wals; a plurality of successively arranged, capacitively coupled conductive regions on said dielectric member; a plurality of parallel transmission lines successively arranged between said end walls and spaced from said top and bottom walls, each being electrically connected at one end to one of said side walls and supported at the other end by said dielectric member in electrical contact with a respective one of said conductive regions; means for injecting microwave energy through one of said end walls and withdrawing microwave energy through the other end wall; and a plurality of shielding members each being disposed between adjacent ones of said transmission lines to prevent microwave energy propagating along each of said transmission lines from coupling with an adjacent transmission line. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A microwave notch filter having a conductive casing with top and bottom walls and opposed pairs of side and end walls, comprising within said casing:
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a dielectric member extending parallel with said side walls; a plurality of capacitive elements successively arranged on said dielectric member; a plurality of parallel transmission lines successively arranged between said end walls and spaced from said top and bottom walls, each being electrically connected at one end to one of said side walls and supported at the other end by said dielectric member in electrical contact with a respective one of said capacitive element; a plurality of quarter-wavelength lines each connected between adjacent ones of said capacitive elements; an input terminal mounted on one of said end walls in electrical contact with the one of said capacitive elements which is adjacent to said one end wall for receiving microwave energy; an output terminal mounted on the other end wall in electrical contact with the one of said capacitive elements which is adjacent to said other end wall; and a plurality of shielding members each being disposed between adjacent ones of said transmission lines to prevent microwave energy propagating along each of said transmission lines from coupling with an adjacent transmission line. - View Dependent Claims (16, 17)
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Specification