Design And Analysis of Tri-Band Antenna with Folded Strip Resonator and Directional UWB Characteristics for Microwave Imaging, GSM and Military Applications
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Abstract
In this article, a compact design of a circular radiating patch antenna with a folded strip resonator (FSR) is proposed for ultra-wideband (UWB) integrated with GSM & Military applications. The overall dimension of the proposed antenna is 30×30 mm2, which is suitable for portable wireless devices. The proposed antenna consists of a circular radiating patch with a partial ground plane. Further, to enhance the impedance bandwidth of the antenna, defected ground structure (DGS) approach is used and three identical rectangular slots have been inserted in the ground plane just below the stepped quarter wave transformer feed line. To realize lower wireless band applications, a folded strip resonator is integrated with the partial ground plane. The antenna has around 90% (S11<-10dB) fractional bandwidth in the UWB band ranging from 6.8-17.9 GHz and resonates at 7.7/9.75/16.25GHz frequencies along with one more resonant frequency at 4.5GHz(3.6-5.4GHz) with 40% (S11<-10dB) fractional bandwidth for military communication. It provides an additional lower frequency band of 1.9GHz(1.7-2.2GHz) for applications of the GSM 1900 band due to addition of FSR in the ground plane which introduces additional capacitance. Furthermore, the half-power-beam-width (HPBW) is obtained from 40°-20° in UWB band. The simulation of antenna structure has been performed on Computer Simulation Technology (CST) software on an FR-4 substrate having a dielectric constant of 4.3 with a thickness of 1.6mm. Simulated results are validated with measured results and good agreement has been observed. The applications of proposed antenna in 1.9 GHz resonating frequency also includes digital enhanced cordless telecommunications, wireless audio devices, healthcare applications and mobile network operations while 4.5 GHz resonating frequency also includes applications in 5G, radar systems, fixed wireless access and cognitive radio network etc.
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