WIDEBAND TAPERED MONOPOLE ANTENNA WITH 2 BY 2 RESONANT LOOP ARRAY FOR ELECTROMAGNETIC ENERGY HARVESTING AND MICROWAVE POWER TRANSMISSION

Abstract

This letter presents the development of a hybrid antenna for electromagnetic energy harvesting and microwave power transmission (MPT). The antenna was designed by mounting a 2 x 2 array resonant loop antennas on a wideband tapered monopole antenna with an etched hole and a patch on the other side. The induced loop resonances on the edges of the patch provide improved impedance matching in the harvesting band. In particular, the 2 x 2 array is mounted without increasing the size of harvesting antenna by using the ground space of it. In order to combine the harvesting and MPT antennas without affecting each other, a duplexing network, which consists of a band stop stub and a high pass filter, is employed. The harvesting antenna has wide 6 dB bandwidth of 0.62-1.3 GHz and 1.58-3.62 GHz. The radiation efficiency of 77-99% was measured in the whole harvesting band. In addition, a 2 x 2 array has a peak gain of 10.18 dBi and radiation efficiency of 89% at 5.8 GHz and operates as a MPT receiving antenna. (c) 2017 Wiley Periodicals, Inc.