SBIR-STTR Award

This proposal presents a novel method for implementing a bank of notch filters at the output of a wideband high power amplifier that are each independently agilely adjustable in bandwidth and center frequency from VHF to L band. The technique offers the capability of achieving notch bandwidths as narrow as a single legacy communications channel with extremely low RF passband insertion loss and very low reflection in both the passband and the stopband.

Benefit:
The development of the proposed notch filter technique will allow blue force radio receivers to maintain reception range in the presence of interference from nearby high power radio transmitters such as jammers or cosite communications equipment.

Keywords:
RFI, RFI, high power, Frequency Agile, Notch Filter, Interference Reduction, EA-6B

This proposal describes the approach that Zeger-Abrams Inc. (ZA) plans to use to implement prototype models (one each) of a Low-Band (designated as 30-600 MHz) and Mid-Band (designated as 400-4,000 MHz) Cosite Notch Filter (CNF). Each CNF will filter out selected narrow spectral portions from the output of a jammer power amplifier while allowing it to pass the rest of its designated frequency range with very low loss. Each CNF will produce four such notches that are independently tunable with center frequency accurately located at the frequencies of friendly force receivers and with accurately selectable notch widths. The Low-Band notch width will be selectable from 45 kHz to 8 MHz. The Mid-Band notch width will be selectable from 1 MHz to 8 MHz.

Keywords:
Rfi Suppression, Dynamic Tunablity, Notch Filter, Cosite, Jammer Interoperability,