Abstract
The paper presents a triband circular polarized rectangular dielectric resonator antenna. A single coaxial cable feeds the DRA to a double stub strip on the DRA side. A patch strip coupled to the feed assists in widening the bandwidth of the proposed DRA. The degenerate mode pair TE∂11x and higher-TE∂23x has been excited to achieve CP and enhance the antenna gain. The higher-order mode has been excited using a low-cost simple excitation mechanism without compromising on the size and shape of the DRA. An impedance bandwidth of 48% with a gain ~6–9 dBic was achieved in all resonance frequencies. Additionally, the AR bandwidth of 5.5%, 4.2%, and 2.76% was obtained at three different frequencies. Note that the proposed DRA exhibits a wide beamwidth of 112o, which is good for better signal reception. A comparison between the measured with simulated results shows that the measured results are matched by the simulated result trends.
Highlights
Over the past few decades, the dielectric resonator antenna (DRA) has been the center of attention among antenna researchers
Considerable attention had focused on the DRAs with circular polarization (CP) as they offered a better quality of signals, alleviate fading and multipath, insensitive to polarization mismatch, which makes them more suitable for wireless communication systems than the linearly polarized (LP) antenna [3,6,7,8,9,10]
The feed connected to the exciting port is optimized with the double stub, while a parasitic patch is deployed at an optimized distance from the dual stub feed on the DRA surface
Summary
Over the past few decades, the dielectric resonator antenna (DRA) has been the center of attention among antenna researchers. This is due to the prominent features of DRA over the microstrip patch such as high radiation efficiency, high gain, less metallic loss, wide bandwidth, lightweight, and tunable far-field pattern due to several modes in DRA [1,2,3]. Many approaches to achieving CP in DRA have been explored previously, such as the dual and single excitation techniques, but end up with a complex feeding network and larger antenna size [11,12,13]. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
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