Experimental validation of removal of sharp ends in sinuous antenna arms

The effect of the removing the sharp ends of the sinuous antenna arms are experimentally validated. The method of removing the sharp ends of the sinuous antenna arms is presented. The gains of the two antennas are measured in an anechoic chamber. The calibration procedure for the feeding network is presented and its validity is proved through comparison with simulation results. The measured results of the original and the modified antennas show that the gains are relatively flat above 1 GHz. The original antenna shows a dip in the gain at approximately 2.1 GHz, which is not observed with the modified antenna. Thus, the removal of the sharp ends is found to improve the gain flatness.