###### Abstract  
This work focuses on a compact circularly polarized wideband rectangular dielectric resonator antenna (RDRA) for X-band wireless applications. The wideband response of the RDRA is initially generated by a coaxial probe, a compact RDR, an air gap in the DR and a slot of rectangular shape in the ground. The circular polarization is achieved via incorporation of a unique feeding mechanism. The edge feeding of the RDRA with a coaxial probe generates the orthogonal modes in RDRA that make the design polarized circularly. The axial ratio performance is improved by adding a copper strip on the top of the DR. To validate the simulated results, the prototype design is fabricated and measured results are noted. For \(-\)10 dB reference value, the prototype has 59.74% impedance bandwidth (8.45-14.09 GHz). For 3  
reflectivity, mitigating polarization mismatch, resistance to extreme weather situations, lessening the multipath interference between the signals, high-level absorption rate, insensitivity towards orientation between transmitter and receiver antennas, and high resistance to Faraday rotation effects [1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13] Polarization is the orientation of the electric field in electromagnetic waves (EMW), hence LP antennas always require accurate alignment of the transmitting and receiving antennas for efficient communication [14]. Generating circular polarization involves the excitation of two near-degenerate equal amplitudes and in phase quadrature orthogonal resonant modes [15]. Impedance bandwidth of the antennas depends on the feeding position and techniques. CP antenna performance depends on the overlapping of the operational impedance bandwidth (having return loss less than \(-10\) dB or VSWR (Voltage Standing Wave Ratio) in between 1 and 2) and an Axial Ratio (AR) bandwidth (less than 3 dB) [16]. Considering the unique properties of CP antennas, multiple CP based antenna techniques are extensively practiced in different wireless communication industries like the cellular communication industry, navigation, radar and satellite communication systems. A great deal of academic and industrial research has been carried out to devise novel techniques for circular polarization. As a result, various types of antennas have been proposed in due course of time [17; 18; 19; 20; 21; 22]. An advanced wireless communication industry requires low profile compact wideband characteristic antennas. As a result, academic and professional antenna designers today are exclusively committed to discovering antennas with a low-quality factor (Q factor) and highly efficient radiation [23; 24]. Dielectric Resonator Antennas (DRAs) are the best possible and emerging antenna technology to fulfill these demands. DRAs are inherently free from metallic losses due to the dielectric nature of the radiator, have insignificant surface waves, wide impedance bandwidth characteristics, high radiation efficiency, high gain, simple excitation methods, inexpensive in nature, and have more degree of design freedom in various shapes like rectangular, triangular and cylindrical [25; 26]. Moreover, relative permittivity and three-dimensional physical size of the Dielectric Radiators (DRs) provide different aspect ratios which include length-to-width and depth-to-width ratios of rectangular shape, central radius of hemispherical shape and height to radius of cylindrical shape are used to easily adjust the resonant frequency of the DRAs [27]. Consequently, DRAs have emerged as an alternative to the low-gain conventional antennas like monopoles, dipoles and Microstrip Patch Antennas (MPAs), especially in the upper microwave and lower millimeter wave frequency bands [28]. The circularly Polarized Dielectric Resonator Antenna (CP DRA) has gained much attention from the antenna designers due to the combined features of both circular polarization and DRs (low cost, low loss, extra design flexibility). There are two different approaches for the circular polarization in DRAs: single feed approach and dual/complex feed approach.