350 rub
Journal Antennas №7 for 2012 г.
Article in number:
Triple-band aircraft antenna for KOSPAS-SARSAT system
Keywords: dipole antennas impedance matching the radiation efficiency lightning protection
Authors:
S.N. Boiko, M.V. Kovaleva, A.S. Petrov
Abstract:
The engineering technique of designing triple-band aircraft transmitter antenna for KOSPAS-SARSAT (KS) system was developed. The electrical scheme with three monopole-type antennas, matched with 50 Ohm feeder by inductive L-sections and band-pass channel filters from lumped-elements combined at an output point, forming triplexer, was proposed. It was established that successive inductor mounted in L-section gives the main part of dissipative losses and thus its value must be minimized. Designed antenna has VSWR<2, maximum gain (1.6, 2.0 и 2.5) dBi and bandwidth (1.8, 3.1 и 18)% at three KS frequencies (121.5, 243 и 406) MHz respectively. Antenna has dimensions (240x190x60) mm, and weighs 0.5 kg. The original and reliable embedded lightning protection system was proposed. Elements dimensions of lightning-conductor topology were established experimentally at the special lightning imitation stand equipment with impulse currents, like in real lightning.
Pages: 34-39
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