Dual frequency planar microstrip antenna

In this paper a simple technique to develop a two layer dual frequency antenna with identical polarization at two far apart frequencies has been presented. Dual rectangular resonator proximity coupled planar microstrip antennas has been designed, fabricated and tested. The design optimisation was carried out using commercial MoM based simulation software. The patch width, intermediate spacing between the coplanar patches are optimized by successive simulations using the commercial software. Measured gain at both the frequencies is over 6 dBi. Measured results are also presented.