Distributed IMPATT structure

Details Distributed IMPATT structure Distributed IMPATT structure

1983-08-31

1985-06-25

Larkins, William D.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333247, 331107R, 330287, 357 51, 357 57, 357 58, 357 68, H01P 115, H01P 308, H01L 2990, H01L 2713

Patent

active

045257329

ABSTRACT:
In a distributed IMPATT structure, power is coupled out through a side contact. That is, in previously proposed distributed IMPATT structures the gain medium (the active region of the IMPATT) operates as a transmission line. The prior art has attempted to couple output power from the gain medium through an end contact, i.e. through a contact which intercepts the primary direction of energy propagation of the active medium. In the present invention, a side contact extends along the whole active region in a direction which is parallel to the principal direction of propagation of the energy in the active medium. Thus, the side contact plus the active region together can be considered as a single transmission line.
The present invention can be configured as an oscillator, amplifier, phase shifter, or attenuator. When configured as an oscillator, multiple short active regions can be sequentially coupled to a single long microstrip, which serves as the side contact for each of the active regions. This very simple power combining scheme provides extremely high power at millimeter wave frequencies.

REFERENCES:
patent: 3346825 (1967-10-01), Scott et al.
Franz et al., I.E.E.E. Transactions on Microwave Theory and Techniques, vol. MTT-26, No. 11, Nov. 1978, pp. 861-865.
Franz et al., I.E.E.E. Transactions on Microwave Theory and Techniques, vol. MTT-28, No. 3, Mar. 1980, pp. 215-218.
Hambleton et al., International Journal of Electronics, vol. 35, No. 2, 1973, pp. 225-244.

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