Abstract
In this study, a compact 2 × 2 circularly polarized (CP) sequentially rotated (SR) dielectric resonator antenna (DRA) array operating in the IEEE 802.11a band is presented. To acquire the CP radiation, an elliptical slot (ES) was introduced to couple a rectangular dielectric resonator (RDR). The ES generates two resonant frequencies corresponding to the dominant even and odd modes. The SR feeder is made of four quarter-wavelength microstrip transformers to reduce the input impedance of the elements and, consequently, maximize the power transferred to each element. Experimental and simulation verifications were conducted on a 54 × 50 × 0.813 mm3 prototype to evaluate the performance of the proposed antenna array, which achieved a VSWR < −10 dB bandwidth of 1 GHz (5.1–6.05 GHz) and axial ratio (AR) < 3 dB of 0.95 GHz (5.1–5.85 GHz). The agreement between the simulated and measured results confirmed the validity of the proposed design.
Highlights
Since the dielectric resonator antenna (DRA) was first introduced by Long et al [1] in 1983, it has attracted increasing attention due to features such as low cost, minimal loss, compact size, light weight, and ease of excitation
One important characteristic is that DRAs can be coupled by several excitation topologies, such as feeds of the microstrip, aperture coupling, coplanar waveguides, and coaxial probes [2]
A 2 × 2 cross-shaped dielectric array was excited by microstrip-fed slot apertures to improve the polarization bandwidth by up to 16%, while an impedance bandwidth of 25% was obtained for the X-band
Summary
Since the DRA was first introduced by Long et al [1] in 1983, it has attracted increasing attention due to features such as low cost, minimal loss, compact size, light weight, and ease of excitation. One important characteristic is that DRAs can be coupled by several excitation topologies, such as feeds of the microstrip, aperture coupling, coplanar waveguides, and coaxial probes [2]. A 2 × 2 cross-shaped dielectric array was excited by microstrip-fed slot apertures to improve the polarization bandwidth by up to 16%, while an impedance bandwidth of 25% was obtained for the X-band. Pang et al (2000) [8] constructed a 2 × 2 array, employing a cross-shaped slot to excite the DRs. The array achieved a 16% 3 dB AR as well as 14% impedance bandwidth in the C-band. Employed a fractal cross-slot to excite four DRs and achieved an axial bandwidth ratio of 18%. A novel approach is proposed to design an SR CP DRA array for the IEEE 802.11a band.
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