A Shared-Aperture Frequency Reconfigurable Multiport Antenna Using Switches

Abstract

Frequency reconfigurable antennas has made a great impact for the increasing demand for higher antenna capabilities since they can operate at tunable narrow frequency bands while rejecting the undesirable signals from other bands. The aim of this project is to study and design frequency reconfigurable antennas for Global Positioning System and satellite applications. In these applications, it is required to have a single antenna that can be adaptively reconfigurable to transmit or receive on multiple frequency bands. The antenna that is chosen in this project is a microstrip antenna. Since microstrip antenna has low gain and directivity, the aim of this project is to improve gain and directivity by making using of a square ring technique. A square ring microstrip patch antenna is designed not only to improve the gain and the directivity but also to reduce the size of the microstrip patch antenna. The square ring antenna is made to operate at L/C-band. Cantilever switches are used in the design to select the frequency. The analysis of reconfigurable antenna using Cantilever switches is done using the simulation performed on Ansys HFSS electromagnetic simulator. The analysis is done in terms of return loss, gain, directivity, VSWR and radiated power. It is observed that this antenna shows frequency reconfigurability at 1.8GHz and 5.4GHz.