Wideband Printed Ridge Gap Semi-Log Periodic Structure Antenna for Millimeter Wave Applications

A wideband semi-log periodic antenna design based on the log periodic antenna is presented. The proposed antenna is fed using a printed ridge gap technology which results in improvement of the efficiency. The proposed design has a matching level less than -10 dB with a fractional bandwidth of 49.37% at 36 GHz. The proposed design has an average realized gain of 6.5 dB over the whole band with stable radiation pattern.