Accession Number : ADA294256

Title :   Monolithic Diode Arrays for Quasioptical Millimeter Wave Beam Steering.

Descriptive Note : Final rept. 22 Sep 94-31 Mar 95,

Corporate Author : MILLITECH CORP SOUTH DEERFIELD MA

Personal Author(s) : Moore, Ellen L. ; Choudhury, Debabani

PDF Url : ADA294256

Report Date : 28 APR 1995

Pagination or Media Count : 34

Abstract : This final report presents the details of the research and design effort for the first phase of a program to produce a monolithic diode array for quasioptical beam steering at millimeter wavelengths. Beam steering is accomplished by adding a linear phase shift across the aperture of an antenna. The quasioptical circuit performing this task comprises a 2-dimensional square metallic mesh on gallium arsenide loaded with Schottky varactor diodes. The mesh is an inductive element and the diodes have a variable capacitance which is controlled by the bias voltage. The phase of a wave transmitted through the monolithic array is changed by an amount determined by the diode capacitance. In this design the beam steering array is a 115 mm diameter mosaic of 12.7 mm x 12.7 mm dies. The array is controlled by a 6 layer drive circuit, which can arbitrarily bias each individual die. The circuit is computer controlled to step the beam in a 4 x 4 point raster pattern. After Phase 2 is completed the beam steering array will be incorporated into existing imaging systems to achieve super-resolution. During Phase 1 we designed the Schottky varactor diodes, mesh circuit, 115 mm beam steering array, and the drive circuit to bias the array. In the final report we show the design of these devices and the DC test results on the diodes.

Descriptors :   *MILLIMETER WAVES, *MONOLITHIC STRUCTURES(ELECTRONICS), *BEAM STEERING, *VARACTOR DIODES, TEST AND EVALUATION, DIODES, LINEAR SYSTEMS, GALLIUM ARSENIDES, ARRAYS, VOLTAGE, MESH, VARIABLES, IMAGES, CIRCUITS, SCHOTTKY BARRIER DEVICES, BIAS, DIRECT CURRENT, DRIVES(ELECTRONICS), CAPACITANCE, PHASE SHIFT, PHASE(ELECTRONICS).

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE