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Abstract
The input (VSWR) and the radiation (pattern and gain) characteristics of two classes of bent wire antennas e.g. the sinusoidal and the meander were measured experimentally as a function of their shortening ratios (SR's). The design variables for these configurations were defined and then correlated with the antenna characteristics. The results of the input characteristics show that for both types of antennas the bandwidth becomes narrower as the shortening ratio increases. For a shortening ratio larger than 30%, VSWR 2.0. However, it was found that for the same shortening ratio the sinusoidal antenna has better VSWR frequency characteristics than the meander. Measured radiation patterns (both H-plane and E-plane) of both classes of antennas show that these are similar to the pattern of a straight quarter-wave monopole. The half-power beam width's (HPBW's) of these bent antennas are somewhat wider (42° -44° ) than that of a straight quarter-wave monopole (39°). The gain of the bent antenna was found to be decreasing with the increase in SR (4.96-3.84 dBi for a sinusoidal when the SR increases from 18% to 38.82% ). The gain of a bent antenna was found to be smaller than a straight quarter-wave monopole (5.1 dBi).