Project Title:

RF Components for Satellite Communications Systems--Active Phased Arrays

92-1-14.05-9611                                                   NAS03-26409
RF Components for Satellite Communications
     Systems--Active Phased Arrays
Epsilon Lambda Electronics Corporation
427 Stevens Street
Geneva, IL  60134
Robert M. Knox                                       (708-232-9611)

Abstract:

     This project addresses phased-array antenna configurations
for producing multiple beams, scanned beams, and for transmitting
(TX) and receiving (RX) by incorporating new emerging monolithic,
multifunction chip technology into the array. When phase-shifter
and TX and RX functions are incorporated directly into the array
(active array), several problems arise which are exacerbated at
millimeter wavelengths (30-100 GHz). First, the TX and RX
functions must be isolated from each other and the radiator. Next,
physical space must be found for all required component functions.
Other problems include undesired radiation form-feed lines, blind
beam directions caused by surface wave modes in the array
substrate, heat dissipation, and the system's high cost and
complexity. The firm will develop an aperture couple array (ACA)
concept which will address and improve the array design in all of
these problem areas. An improvement on an already published and
validated ACA concept results from incorporating the now-mature
fiber millimetric technology into the TX and  RX and phase-shifter
functions. The Phase II demonstration will provide a basis for
Phase III incorporation of emerging monolithic TX and RX and phase
shifter devices. A program plan for the Phase II demonstration of
an active sub-array based on the validated concept will be
prepared during Phase I.

Potential Commercial Application:

Potential Commercial Applications:  This large active array has
potential use in various types of government communication
satellites of various types which will operate in millimeter
wavelengths. It is also potentially useful in commercial
communication satellites for fixed and mobile services at
different altitudes.

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