Travelling-wave microwave device

Details Travelling-wave microwave device Travelling-wave microwave device

1986-07-15

1988-03-22

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including distributed parameter-type coupling

330 54, H03F 360

Patent

active

047331950

ABSTRACT:
A travelling-wave transistor structure (50) with the input and output transmission lines (54,58) terminated with unmatched impedances (70,72,74;80,82,84) to improve high-frequency response by reflection and phase shift to provide constructive interference is disclosed. Preferred embodiments include a .pi.-gate (52,56) MESFET structure travelling-wave transistor with many periodically spaced gate feeding fingers (56) connecting gate (52) to gate transmission line (54) which parallels gate (52). This provides a compact structure and has large advantages at millimeter wave frequencies. Source (60) may be grounded by vias (61) or may pass over gate transmission line (54) by air bridges to a ground on the same surface as the MESFET.

REFERENCES:
patent: 4543535 (1985-09-01), Ayasli

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