High-power Electronic Tuning

Award Information
Agency: Department of Defense
Branch: Army
Contract: N/A
Agency Tracking Number: 36823
Amount: $99,037.00
Phase: Phase I
Program: SBIR
Awards Year: 1997
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Green Mountain Radio Research
50 Vermont Ave Fort Ethan, Allen, Colchester, VT, 05446
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dr. Frederick H. Raab
 (802) 655-9670
Business Contact
Phone: () -
Research Institution
N/A
Abstract
Tunable HF/VHF filters capable of operating at high power levels are needed for preventing a jammer from interfering with nearby friendly communications, high-speed antenna tuners, and output filters for high-efficiency power amplifiers (PAS). Filter systems presently employ either relays or pin-diode switches to select one filter from a bank of filters that spans the operating frequency range. Tuning systems similarly select combinations of inductors or capacitors. The problems with the present approach include: slow switching, especially if relays are used; size and weight; imperfect match (SWR) in band; use of inefficient class-B PAs that require no, tuning; and use of low-efficiency resistively loaded antennas. High-power electronic tuning can therefore benefit a variety of military and civilian applications. The proposed program will investigate the feasibility of high-power electronically tuned filters. The investigation includes: filter topology, semiconductors that exhibit voltage-variable capacitance, variable ceramic-chip capacitors, and variable toroidal inductors. The proposed program brings together experts on both RF-power circuits (Dr. Frederick H. Raab) and semiconductors (Dr. Krishna Shenal). Use of fewer filters makes possible reductions in size, weight, and cost. Precise tuning boosts the efficiency of RF-power amplifiers in general and makes high-efficiency (class-D, -E) amplifiers readily useable. Electronic tuning simplifies antenna tuners and makes possible the use of antennas with better gain.

* information listed above is at the time of submission.

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