Novel wideband circularly polarized DRA with squint-free radiation characteristics

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 $$TE_{\delta 11}^x$$ T E δ 11 x , $$TE_{1\delta 1}^y$$ T E 1 δ 1 y , $$TE_{121}^z$$ T E 121 z , $$TE_{112}^y$$ T E 112 y , $$TE_{131}^x$$ T E 131 x , and $$TE_{311}^y$$ T E 311 y . The experimental results demonstrate an impedance bandwidth of approximately $$66.8\%$$ 66.8 % (3.71–7.45 GHz) and a 3-dB axial-ratio (AR) bandwidth of about $$54.8\%$$ 54.8 % (3.72–6.53 GHz) with a stable broadside beam achieving a measured peak gain of about $$4.64 \, {\text{dBic}}$$ 4.64 dBic . Furthermore, a 100% correction in beam squint value from $$\theta = 41^\circ$$ θ = 41 ∘ to $$\theta = 0^\circ$$ θ = 0 ∘ with respect to the antenna boresight is achieved.

A Review of Circularly Polarized Dielectric Resonator Antennas: Recent Developments and Applications

“…These difficulties have motivated researchers to construct antennas with additional design enhancement in order to increase the bandwidth and performance, as well as reducing their physical size. Dielectric resonator antennas (DRAs) have recently been used to replace MPAs due to their interesting characteristics such as versatility in shape, compact size, zero metallic losses, ease of excitation, and relatively wide impedance bandwidth [4][5][6][7]. Moreover, DRAs exhibit higher radiation efficiency even at higher frequencies due to the absence of intrinsic conductor loss and surface wave loss [8].…”

A novel ultra wideband circularly polarized stacked cylindrical dielectric resonator antenna with modified ground plane

“…Although there are some CPDRAs were reported with wide IBW and ARBW. [24][25][26] The DR structure reported in Reference [24] is complex and gain reported in References [25,26] is less.…”

“…The proposed antenna configuration is stacked DRAs, even though the proposed antenna size is less comparative to other research articles, 9,11,12,17,20,22–25 it is worth mentioning that there are various methods to reduce the size of antenna 31–35 . The simplest way to design a compact size DR, is to select high dielectric constant material.…”

A Compact Dual polarized Dielectric Resonator Antenna for Wireless Applications

“…They have taken lots of attention due to several advantages: ease of excitation, high radiation efficiency, compact size, versatility in shape, numerous feeding techniques, and low dissipation loss. The lack of conductor loss causes higher efficiency in DR antennas, compared to the conventional metallic antennas [1][2]. Meanwhile, there is high demand for antennas diversity since signal reception can be improved.…”