GTMR Bowtie Antennas

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1/4-wave Bowtie Antenna

1/2-wave Bowtie Antenna

Bowtie Antennas

The GTMR bowtie antennas were a Quick Reaction Capability (QRC) design and prototype in response to a client requirement for a proof-of-concept ELINT system that did not require the external modification of the aircraft. The proposed installation required the antennas to "look out" through a cabin window at the largest possible area within that physically restricted field of view and provide the necessary gain at the operating frequency band for any signal on the horizon (180nm) to be 10-12dB above the noise floor at the receiver front end. Elasped time from telephone receipt of the technical requirements to the two units enroute was under 20 hours.

The narrow front-to-back thickness of GTMR bowtie antennas permits them to be placed directly against the aircraft window making the antenna specific beamwidth of ±20 degrees the limiting factor for horizontal FOV, not the lateral dimension of the window itself for antennas which, for size reasons, must be placed farther back in the fuselage. The gain (8-10GHz) for both the 1/2 wavelength and 1/4 wavelength versions is a nominal 11dB, and with a minor modification to the reflector this performance can be improved to 13-14dB.

Subsequent discussions with respect to the client mission has resulted in an architecture that provides automatic bearing-to-target information to cockpit crews using paired, obliquely angled bowties and GTMR analysis software. This architecture allows the use of non-360 field of view detection and identification systems to "course steer" the aircraft onto the target bearing and track to the target when the target is outside the detection and identification field of view.

Purchasing Information

For purchasing information or additional details, please contact GTMR Inc.

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