A dual fed and a dual frequency slots-loaded triangular microstrip antenna

As the advances in wireless communication technology are very rapid, there have been vast research in dual fed microstrip antennas in order to isolate the Tx and the Rx signals and for a variable profile dual frequency patch. For example, the study of dual frequency operation has been carried out with the via-hole feed and microstrip line feed. Using a dual resonant microstrip antenna would be better than the broadband microstrip antenna, because it is very difficult that a single layer microstrip antenna has a bandwidth which covers the up- and down-link of the IMT-2000 system. In this article, a dual resonant triangular microstrip antenna with slots-loaded and the characteristics of the isolation between the Tx and the Rx ports using inset microstrip line feed and probe feed methods are proposed and experimentally studied for the case of a thin substrate.