Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1982-10-22
1985-08-20
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333202, 333116, 333246, H01P 1203, H01P 708, H01P 308, H01P 518
Patent
active
045367256
ABSTRACT:
A stripline filter having at least two tuned striplines and a directional stripline coupler wherein the coupling path of the directional stripline coupler is located in the signal path between the input and output terminals of the filter. The stripline filter comprises an insulating substrate having a ground conductor affixed thereto and at least two tuned stripline resonators secured to the substrate, the resonators being electrically connected to the ground conductor. The tuned striplines resonate at one-quarter of the wavelength corresponding to the operating frequency of the filter. The directional stripline coupler consists of a pair of spaced conductors, at least one of which forms a part of one of the tuned striplines. The electrical length of the directional stripline coupler is substantially less than the total length of a tuned stripline conductor.
REFERENCES:
patent: 3451015 (1969-01-01), Heath
patent: 3659205 (1972-04-01), Cooke et al.
patent: 4158184 (1979-06-01), Kenyon
patent: 4494086 (1985-01-01), Dydyk
Wenzel-"Exact Design of TEM Microwave Networks using Quarter Wave Lines", IEEE Trans. on Microwave Theory and Techniques, Jan. 1964; pp. 94-111.
IEEE "1980 IEEE MTT-S International Microwave Symposium Digiest," pp. 477-479, 1980 The Institute of Electrical & Electronics Engineers.
Fechner, "Microstrip Elliptic Function Bandpass Filters," pp. 79-80, vol. 34 (1980) No. 3, Cauerparameter-Bandpasse in Mikrostreifenleiter-Technik.
Rehnmark, "Meander-Folded Coupled Lines," pp. 225-231, Apr. 4th, 1978, IEEE Transactions on Microwave Theory and Techniques, vol. MTT-26, No. 4.
Rizzoli, "Analyais and Design of Microstrip DC Blocks," pp. 109-110, vol. 20, No. 6, Jun. 1977 Microwave Journal.
LICENTIA Patent-Verwaltungs-G.m.b.H.
Nussbaum Marvin L.
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