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Feedback optimization of grid oscillators

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2 Author(s)
Shiroma, W.A. ; Dept. of Electr. Eng., Hawaii Univ., Honolulu, HI, USA ; Popovic, Z.B.

We present a method for optimizing the feedback level in a transistor-grid oscillator. Based on the approximate large-signal S-parameters of the transistor, an equivalent circuit model for the grid is synthesized for maximum oscillator power. The resulting circuit serves as a convenient benchmark for determining the level of feedback for a given grid. Experimental results demonstrate how the substrate thickness and metallization pattern affect power performance. A grid with an asymmetric unit cell is shown to deliver almost 60% more effective radiated power than a grid with a symmetric unit cell.

Published in:

Microwave Symposium Digest, 1997., IEEE MTT-S International  (Volume:2 )

Date of Conference:

8-13 June 1997