Printed Log-Periodic Monopole Array Antenna With a Simple Feeding Structure

A novel printed log-periodic monopole array (PLPMA) antenna is proposed and investigated. The antenna has advantages of easy design, wide bandwidth, and high gain. Compared with conventional printed log-periodic dipole array antennas, the antenna has a simpler feeding structure, and its monopole elements have smaller size and can be printed on a single side of the substrate. A PLPMA with 12 printed monopole elements is designed. A prototype of the antenna is fabricated using the standard printed circuit board process, and measured results are consistent with theoretical and simulated results. Measured results show that the design has a broad operation band from 8.4 to 14.6 GHz, in which the voltage standing-wave ratio is lower than 2.0 and the gain is high and stable with a variation from 6.5 to 9.5 dBi.