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Proceedings Paper

Microwave Active Array Elements
Author(s): Kai Chang; Kenneth A. Hummer; James L. Klein
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Paper Abstract

Two types of active antenna elements have been investigated. One type uses a microstrip antenna with an active device mounted directly on the antenna. The other uses an active device coupled to a microstrip patch antenna through an aperture. Microstrip active antenna elements and two-element arrays have been demonstrated for both types of circuits. Injection locking of the antenna elements has been achieved through space and mutual coupling. The circuit Q-factor was calculated based on the locking gain and locking bandwidth. The power outputs from two elements have been successfully combined in free space with a combining efficiency of over 90 percent. An analytical method based upon the aperture coupling theory and the derivation of S-parameter matrix has been developed for modeling a microstrip line coupled to a microstrip patch antenna using a circular coupling aperture. The results should have many applications in low cost active arrays, active transmitters, and spatial power combiners.

Paper Details

Date Published: 8 September 1988
PDF: 8 pages
Proc. SPIE 0947, Interconnection of High Speed and High Frequency Devices and Systems, (8 September 1988); doi: 10.1117/12.947446
Show Author Affiliations
Kai Chang, Texas A&M University (United States)
Kenneth A. Hummer, Texas A&M University (United States)
James L. Klein, Texas A&M University (United States)


Published in SPIE Proceedings Vol. 0947:
Interconnection of High Speed and High Frequency Devices and Systems
Alfred P. DeFonzo, Editor(s)

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