High Frequency Aircraft Wire Antenna.
DEPARTMENT OF THE ARMY WASHINGTON DC
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What is disclosed is an antenna system for aircraft and one having particular utilization on a helicopter where there is a need, among other things, to eliminate insofar as possible rotor blade modulation of the signal radiated from on-board air-to-ground communication system in the 2 to 30 MHz band. The antenna comprises a current fed ground loop-antenna having an electrical length which is relatively short with respect to the operating wavelength. The antenna conductor is mounted by means of insulators on the outside of the aircraft body, having one end connected to the transmitter while the other end is series connected to a lumped electrical inductance element whose opposite end is terminated in the metallic skin of the aircraft. The electrical inductance, moreover, is variable so as to resonate the antenna to the driving impedance of the transmitter. Author
- Electrical and Electronic Equipment