FEASIBILITY STUDY OF HIGH-EFFICIENCY RF-POWER COMBINERS

Award Information
Agency:
Department of Defense
Branch
Army
Amount:
$61,162.00
Award Year:
1991
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Agency Tracking Number:
15860
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Green Mountain Radio Research
50 Vermont Ave - Ft Ethan Alle, N, Colchester, VT, 05446
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Frederick H Raab
Principal Investigator
(802) 655-9670
Business Contact:
() -
Research Institution:
n/a
Abstract
MODERN HF/VHF JAMMERS EMPLOY POWER COMBINERS AND MULTIPLE POWER-AMPLIFIER (PA) MODULES TO ACHIEVE A HIGH POWER OUTPUT, CANCELLATION OF HARMONICS, AND GRADUAL DEGRADATION OF PERFORMANCE DUE TO MODULE FAILURE. POWER COMBINERS CAN BE A SIGNIFICANT SOURCE OF POWER LOSS BECAUSE OF RESISTIVE LOSSES, MISMATCH (AMPLITUDE/ PHASE) OF PA OUTPUTS, AND PA INEFFICIENCY DUE TO NONNOMINAL LOAD. CURRENTAND VOLTAGE-SUMMING COMBINERS HAVE NO INTRINSIC LOSSES, BUT PROVIDE NEITHER ISOLATION NOR CONSTANT IMPEDANCE. HYBRID COMBINERS PROVIDE ISOLATION, BUT ARE INEFFICIENT WHEN THE INPUT SIGNALS DIFFER IN AMPLITUDE AND/OR PHASE. DIRECTIONAL AND QUADRATURE COUPLERS PROVIDE CONSTANT IMPEDANCE, BUT ARE INEFFICIENT FOR MISMATCHED AMPLITUDE, PHASE, OR LOAD IMPEDANCE. A VARIATION ON THE LUMPEDELEMENT WILKINSON COMBINER AND ADAPTIVE INTERCONNECTION APPEARS ATTRACTIVE. HOWEVER, EACH TYPE OF COUPLER HAS ITS OWN CHARACTERISTICS, AND A SINGLE TYPE OF COMBINER MAY NOT BE OPTIMUM FOR ALL APPLICATIONS. THE PROPOSED PROGRAM WILL CONDUCT THE GROUND WORK NECESSARY FOR SYNTHESIS AND IMPLEMENTATION OF HIGH-EFFICIENCY POWER COMBINERS. ITS PRINCIPAL COMPONENTS ARE: ANALYSIS OF DIFFERENT COMBINERS IN A COMMON FRAMEWORK, COMPARISON OF THEIR EFFECTS UPON PAS, DETERMINATION OF TRADE-OFFS BETWEEN COUPLER LOSS AND PA EFFICIENCY, AND IDENTIFICATION OF THE MOST PROMISING APPROACHES FOR DEVELOPMENT.

* information listed above is at the time of submission.

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