Airbridge compensated microwave conductors

Details Airbridge compensated microwave conductors Airbridge compensated microwave conductors

1991-11-15

1993-03-16

Gensler, Paul

Wave transmission lines and networks

Coupling networks

With impedance matching

333246, 333247, H01P 508

Patent

active

051948338

ABSTRACT:
The performance of microwave coplanar and other circuit boards is improved by providing local matching elements for adjusting the characteristic impedance of local transmission line segments to better match the input or output impedance of the particular devices to which they couple. This is accomplished by providing a conductive bridge over the active lead of the transmission line, thereby lowering its characteristic impedance. This is very useful for narrow transmission line segments needed to make contact to small active device and/or MMIC's and which otherwise exhibit a substantial impedance mismatch with such small elements.

REFERENCES:
patent: 3995239 (1976-11-01), Head et al.
patent: 4281302 (1981-07-01), Stegens
patent: 4549197 (1985-10-01), Brehm et al.
patent: 4739519 (1988-04-01), Findley
patent: 4853624 (1989-08-01), Rabjohn
patent: 4906953 (1990-03-01), Li et al.
patent: 4959705 (1990-09-01), Lemnios et al.
patent: 5105171 (1992-04-01), Wen et al.
"The Effect of Air Bridge Height on the Propagation Characteristics of Microstrip" by Marc E. Goldfarb and Vijai K. Tripathi, IEEE Microwave and Guided Wave Letters, vol. 1, No. 10, Oct. 1991, pp. 273,274.

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