An Annular Switchable Antenna For WiFi, WiMax, WLAN & UWB Frequency Range Applications

This paper contemplates designing of a compact switchable antenna for ultra-wideband frequency range applications using four annular patches. A total of sixteen test cases were analyzed in this paper by placing and removing annular patches at the upper patch of the antenna. The antenna is made of substrate called FR4 epoxy. The upper patch and ground plane of the antenna are designed using copper material. The antenna dimensions were set to be 34mm×30mm×1.6mm. This paper introduces the concept of partial ground which is very useful in attaining wider −10 dB bandwidth. The proposed antenna attains the −10dB bandwidth ranging from 2 GHz to 12 GHz. The antenna achieves a reflection coefficient of −25.94 dB at the frequency of resonance of 2.9 GHz. This presented antenna can achieve a peak gain of 7.09 dBi at the frequency of 10.6 GHz. The antenna achieves a radiation efficiency of 97.25%. This work points out that when all the annular patches were attached to the antenna the conduction length of the patch increased because of which the antenna can attain a good reflection coefficient even at a lower frequency. This makes the antenna workable for a wide range of frequency bands.