Abstract
A new single-fed circularly polarized dielectric resonator antenna (CP-DRA) without beam squint is presented. The DRA comprises an S-shaped dielectric resonator (SDR) with a metalized edge and two rectangular dielectric resonators (RDRs) blocks. Horizontal extension section is applied as an extension of the SDR, and a vertical-section is placed in parallel to the metallic edge. A vertical coaxial probe is used to excite the SDR and the vertical RDR blocks through an S-shaped metal element and a small rectangular metal strip. The two added RDRs that form an L-shaped DR improve the radiation characteristics and compensate for the beam squint errors. A wideband CP performance is achieved due to the excitation of several orthogonal modes such as TE_{delta 11}^x, TE_{1delta 1}^y, TE_{121}^z, TE_{112}^y, TE_{131}^x, and TE_{311}^y. The experimental results demonstrate an impedance bandwidth of approximately 66.8% (3.71–7.45 GHz) and a 3-dB axial-ratio (AR) bandwidth of about 54.8% (3.72–6.53 GHz) with a stable broadside beam achieving a measured peak gain of about 4.64 , {text{dBic}}. Furthermore, a 100% correction in beam squint value from theta = 41^circ to theta = 0^circ with respect to the antenna boresight is achieved.
Highlights
GHz) and a 3-dB axial-ratio (AR) bandwidth of about 54.8% (3.72–6.53 GHz) with a stable broadside beam achieving a measured peak gain of about 4.64 dBic
The 3D structure of Dielectric resonator antennas (DRAs) provides a higher degree of flexibility over microstrip antennas that have been widely used in various s ystems[4,5] but suffer from limited bandwidth and low radiation efficiency caused by the conduction losses[6]
The circularly polarized dielectric resonator antenna (CP-DRA) in19,21,23,27–29 suffered from a large squint angle, which is more than 20◦ due to the excited orthogonal modes’ asymmetry in magnitude and phase between them
Summary
Mohammad Abedian1*, Mohsen Khalily[1], Vikrant Singh[1], Pei Xiao[1], Rahim Tafazolli1 & Ahmed A. The 3D structure of DRAs provides a higher degree of flexibility over microstrip antennas that have been widely used in various s ystems[4,5] but suffer from limited bandwidth and low radiation efficiency caused by the conduction losses[6]. Two orthogonal modes must be excited with a quadratic phase difference to design circularly polarized DRA, which can be realized by single or multiple feed mechanisms. A DRA containing rectangular and two half-split cylindrical DRs excited by a stair-shaped slot has been proposed in24 which offers 41.01% AR bandwidth but low gain. Such squint is undesirable for communication as the co-component’s peak amplitude is not in the broadside direction This behavior introduces frequency selectivity to the wideband signal, resulting in the CP antenna’s poor performance and compromised system efficiency. The design procedure and the measured and simulated results are discussed
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