Compact Tri Band Frequency Reconfigurable L-Slot Octagonal Shape Patch Antenna

A frequency reconfigurable octagonal shaped patch antenna is designed and its properties are studied. In this paper, a micro strip patch antenna. In this antenna design patch of the antenna is separated into three parts by cutting the open ended L-slot on the both side of the patch. Here four PIN diodes are used for the operation. When the diode D₁ and D₃ is on than the antenna works on the frequency 4.6688 GHz, 7.8864 GHz and 10.662 GHz while the D₂ and D₄ is on state than this antenna works for the 5.1893 GHz, 8.2492 GHz and 11.467 GHz. This compact size antenna with the dimensions of the 25 × 28 mm² is design on the FR-4 substrate of the thickness h = 0.8 mm and the dielectric constant of this material is 4.4.