Abstract
In this paper, the size reduction of a dual-band circularly polarized (CP) Y-shaped dielectric resonator antenna (YDRA) is performed. Unlike the conventional CP DRAs, the circular polarization in the YDRA is achieved by the combination of linearly varying E-fields in the two arms of unequal length. Therefore, a PEC boundary condition based technique is applied to the long arm of the dielectric resonator (DR). As a result, a 33.18% reduction in the size is achieved after the optimization of the DR for the required frequency bands. A sample of the proposed design is fabricated to perform measurements. From the results, the antenna obtains a wide impedance bandwidth for $|S_{11}| \leq -10$ dB of 53.5% (2.3–3.98 GHz), 3 dB axial ratios bandwidths (ARBWs) of 4.08% (2.4–2.50 GHz) and 10.91% (3.38–3.77 GHz) with respective peak gains of 4.83 dBic and 4.81 dBic. The attained 3 dB ARBWs entirely cover the WLAN 2.4 GHz and WiMAX 3.5 GHz frequency bands.
Highlights
I N early 1983, Long et al pioneered the field of ceramic antennas after studying the resonant modes, radiation characteristics and excitation of modes in the cylindrical dielectric resonator (CDR) [1]
One way to design a circularly polarized (CP) dielectric resonator antennas (DRAs) is the selection of an appropriate feeding mechanism (FM)
A sigmoid-shaped dual-band CP DRA is reported with 3 dB axial ratios bandwidths (ARBWs) of 19.98% and 3.07% [19]
Summary
I N early 1983, Long et al pioneered the field of ceramic antennas after studying the resonant modes, radiation characteristics and excitation of modes in the cylindrical dielectric resonator (CDR) [1]. For category (iv), Shahid et al proposed the DRA with AMC to achieve miniaturization with a narrow bandwidth [29] and for (v), a work is reported recently [30]. DRAs that can simultaneously deliver the dual-/wide-band −10 dB IBW, miniaturization, and CP radiation are demanded. In this context, one miniaturized dual-band CP conventional RDR is developed that achieves both characteristics (CP radiation and miniaturization) by the use of smaller metallic patches on all four sidewalls of the DR [31]. By applying the PEC boundary on the longest arm, a size reduction with CP radiation is achieved but the required bands are not entirely covered. The details of antenna design and size-reduction process, parametric study, Eigenmode analysis, and comparison of the simulated and experimental results are detailed
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