Electrical Properties and RF Energy Response of Metal Loop Antennas for Wireless Sensing and Detecting of Conductive and Non Conductive Materials

摘要

A number of loop antennas designed to operate at UHFudISM band 2.4-2.5 GHz have been investigated. Four types of loopudantennas were designed and fabricated including the circularudwire loop, square loop, circular plate loop, and disk loop. Theudcircular plate loop has been incorporated into the RF sensing anduddetection peripheral due to its excellent practical performance. Itudwas examined in various types of wireless environments whereudthe complex object/ material both conductive and non conductiveudexisted. In this paper, each type of antennas was also tested,udnumerically and experimentally, to obtain its individual electricaludproperties such as S11, VSWR, and radiation pattern.