Broadband microwave card attenuator

Details Broadband microwave card attenuator Broadband microwave card attenuator

1976-11-24

1978-08-15

Smith, Alfred E.

Wave transmission lines and networks

Attenuators

333 81R, H01P 122

Patent

active

041076338

ABSTRACT:
The invention relates to a card-type attenuator having a flat insertion loss from DC to 2 GHz or higher. A rectangular card has two ground conductors extending along its longitudinal side edges and an inner conductor extending along a first face of the card midway between said ground conductors. The outer conductor comprises two main parts: First, a metal trough into which the card is placed with the two ground conductors, and secondly, an inverted U-shaped metallic spring which has its free ends pressing against the ground conductors respectively to hold them firmly in the trough. The inner conductor is accurately positioned a distance from the bottom of the trough which is small compared to the distance that the U-shaped spring is above the inner conductor. Hence, most of the electromagnetic field exists between the inner conductor and the bottom of the trough. Accordingly, the exact size and shape of the U-shaped spring is not critical. The card has resistive layers of width many times smaller than the length of the card respectively adjacent the two ends of the card. Each such layer extends from the inner conductor to the ground conductor. A plurality of said card attenuators are used to form a drum attenuator. A special spring contact connects such card to the output switch of the drum attenuator.

REFERENCES:
patent: 3217276 (1965-11-01), Cooper et al.
patent: 3260971 (1966-07-01), Bacher et al.
patent: 3622919 (1971-11-01), Wilhoit
patent: 4001736 (1977-01-01), Malcolm et al.
patent: 4011531 (1977-03-01), Gaudet

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