Wearable Micro Strip Antenna for X – Band Applications
Abstract
Recently wearable antennas are gaining sufficient attention in many fields. The wearable antennas must be light weight and can be easily integrated into the garments. To meet these requirements, conductive textiles and conductive threads can be widely used. Wearable antennas provide the advantage of dielectric substrate flexibility, low design cost and ease of manufacture. A badge shaped microstrip wearable antenna for X-band applications is proposed. The badge shaped microstrip antenna is to be simulated using CST MW STUDIO. Two badge shaped antennas were proposed-one with a 1mm wide rectangular slot and the other without any slots in. The antenna structure consists of a rectangular ground plane and a rectangular dielectric substrate whereas the radiating element is badge shaped. The existing wearable antenna consists of a truncated patch and a circular ring patch antenna with four conductive threads which is used for indoor and outdoor positioning. This antenna was integrated on top of the military beret. The proposed antenna is used for vehicle speed detection. This antenna can be used as an alternative for the radar speed gun which is used to measure the speed of the vehicle. The various antenna parameters like E-field, H-field, S11, frequency and VSWR (voltage standing wave ratio) were analysed using simulation. Vector Network Analyzer (VNA) was used to measure the return loss parameter S11 and VSWR in the fabricated antenna. The working frequency of both the antennas were found to be 10.48 GHz. The simulated results of return loss parameter s11 was found to be -16.72 dB for antenna without slot and -15.96 dB for antenna with slot. The standing wave ratio VSWR was found as 1.341 for antenna without slot and 1.378 for antenna with slot. The measured results of s11 were found to be -19.10 dB for antenna without slot and -12.35 for antenna with slot, whereas the standing wave ratio VSWR were found as 1.25 for antenna without slot and 1.63 for antenna with slot.
