Design and Analysis of Circularly Polarized Defected Ground Elliptical Patch Antenna for Long Term Evolution (LTE) and 4G Wireless Applications

In this article the strategy and analysis of a defected ground stacked elliptical patch microstrip antenna (EPMA) is presented for circular polarization (CP). This antenna gives an impedance bandwidth of 44.0% with respect to resonant frequency 1.98GHz, which is eight times greater in comparision to conventional elliptical patch microstrip antenna (EPMA) along with axial ratio bandwidth of 5.5% with reverence to frequency 1.98GHz. The antenna is studied on a Flame Retardant (FR-4) substrate having substrate permittivity 4.4 and thickness 1.59mm. The CP behaviour is observed by truncating the conventional elliptical patch and inserting slots. A square slot is also etched in ground plane at an angle of 45 degrees with respect to horizontal axis. This antenna design having a dimension of ground plane $35.0\times 32.0\ \text{mm}^{2}$ . To achieve the higher impedance bandwidth, the technique of multilayer stacked of patch is used. The over all height of antenna is 9.18mm. This antenna can be used in Long Term Evolution (LTE) and 4G Wireless Applications.