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A 10 GHz Quasi-Optical Grid Amplifier Using Integrated HBT Differential Pairs

Kim, Moonil and Sovero, E. A. and Ho, W. J. and Hacker, J. B. and Rutledge, David B. and Rosenberg, James J. and Smith, R. Peter (1992) A 10 GHz Quasi-Optical Grid Amplifier Using Integrated HBT Differential Pairs. In: 50th annual Device Research Conference, Digest. IEEE , Piscataway, NJ, pp. 136-137. ISBN 81254021

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We report the fabrication and testing of a 10 GHz grid amplifier utilizing sixteen GaAs chips each containing an HBT differential pair plus integral bias/feedback resistors. The overall amplifier consists of a 4x4 array of unit cells on an RT Duroid™ board having a relative permittivity of 2.2. Each unit cell consists of an emitter-coupled differential pair at the center, an input antenna which extends horizontally in both directions from the two base leads, an output antenna which extends vertically in both directions from the two collector leads, and high inductance bias lines. In operation, the active grid array is placed between a pair of crossed polarizers. The horizontally polarized input wave passes through the input polarizer and couples to the input leads. An amplified current then flows on the vertical leads, which radiate a vertically polarized amplified signal through the output polarizer. The polarizers serve dual functions, providing both input-output isolation as well as independent impedance matching for the input and output ports. The grid thus functions essentially as a free-space beam amplifier. Calculations indicate that output powers of several watts per square centimeter of grid area should be attainable with optimized structures.

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Additional Information:© 1992 IEEE. Date of Current Version: 06 August 2002.
Record Number:CaltechAUTHORS:20120315-145041263
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Official Citation:Moonil Kim; Sovero, E.A.; Ho, W.J.; Hacker, J.B.; Rutledge, D.B.; Rosenberg, J.J.; Smith, R.P.; , "A 10 GHz Quasi-Optical Grid Amplifier Using Integrated HBT Differential Pairs," Device Research Conference, 1992. Digest. 50th Annual , vol., no., pp.0_136-0_137, 22-24 Jun 1992 doi: 10.1109/DRC.1992.671900 URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29735
Deposited By: Tony Diaz
Deposited On:20 Mar 2012 21:53
Last Modified:26 Dec 2012 14:57

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