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
Award Id:
15860
Agency Tracking Number:
15860
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
50 Vermont Ave - Ft Ethan Alle, N, Colchester, VT, 05446
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Frederick H Raab
Principal Investigator
(802) 655-9670
Business Contact:
() -
Research Institute:
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.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government