A VERY BROAD BAND LOW SILHOUETTE ANTENNA
ARMY ELECTRONICS COMMAND FORT MONMOUTHNJ
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The report describes the development of a very broad-band, lightweight, linearly polarized, low silhouette antenna which operates over a bandwidth in excess of 121. The antenna consists of a very short section of a double-ridged waveguide, with a coaxial input, which is used to launch a wave on logarithmically curved extensions of the ridges. Radiation pattern, gain and VSWR data for an experimental model, which operates over the 1 - 12 GHz frequency range, are presented. A technique for reducing back and side radiation, as well as improving the VSWR performance at the lower end of the frequency range, is discussed and experimental results are included. These data show that a backward travelling wave, reflected from the tips of the radiators, leads to high back and side lobes and introduces violent oscillatory excursions into the VSWR curve at the lower end of the frequency range.
- Electrical and Electronic Equipment