Temperature compensated time delay element for a differentially

Details Temperature compensated time delay element for a differentially Temperature compensated time delay element for a differentially

1981-01-09

1983-10-11

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

333161, 333246, 329145, H01P 900, H03D 302

Patent

active

044095686

ABSTRACT:
A temperature compensated time delay element employs a non-temperature compensated delay element along a first delayed path, and a second non-temperature compensated delay element along a second "undelayed" path to provide a net time delay equal to the difference between the delays in the delayed and undelayed paths. The substrate materials used in the delay elements in the delayed and undelayed paths, and the time delays of the two paths, are selected such that the variation of net phase shift, or time delay, with temperature is zero. The temperature coefficients of the substrate materials in the delayed and undelayed paths can both be positive, thus allowing the use of common substrate materials. The temperature compensated time delay element finds particular utility in differentially coherent signal detection systems.

REFERENCES:
patent: 2928940 (1960-03-01), Ruthroff
patent: 3936751 (1976-02-01), Holmes et al.
patent: 3965444 (1976-06-01), Willingham et al.
patent: 3983424 (1976-09-01), Parks
patent: 4054841 (1977-10-01), Henaff et al.
patent: 4218664 (1980-08-01), Assal et al.
patent: 4293830 (1981-10-01), Accatino
International Microwave Symposium Digest, "Temperature Compensated BaTi.sub.4 O.sub.9 Microstrip Delay Line", by Lee and Childs, Jun. 1979, pp. 419-421.

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