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Analysis and 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.

A method for assessing and optimizing the feed-back level in a transistor-grid oscillator is presented. 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 are presented for five different grid oscillators covering S through Ka bands. By varying the substrate thickness and metallization pattern of the grid, the feedback can be optimized in accordance with the theory. A grid with an asymmetric unit cell is shown to deliver almost 60% more effective radiated power (ERP) than a grid with a symmetric unit cell

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:45 ,  Issue: 12 )

Date of Publication:

Dec 1997

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