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High-efficiency circular dense dielectric patch antenna with frequency selectivity

High-efficiency circular dense dielectric patch antenna with frequency selectivity

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A circular dense dielectric (DD) patch antenna realised by stacking an upper DD patch on the lower DD patch is proposed to achieve high efficiency and frequency selectivity. The high efficiency is attributed to the non-metallic radiators and the radiations of both lower and upper DD patches operating at TM11 mode. To achieve higher frequency selectivity than that of the reported DD patch antennas, the opposite E-field distribution inside the upper DD patch and the quarter-wavelength open-circuit stub produce two radiation nulls near the lower band-edge, while the opposite E-field distribution inside the lower DD patch and the opposite E-field distribution at the edges of the two DD patches produce two radiation nulls near the upper band-edge. For demonstration, a prototype covering the fifth generation (5G) band (3.4–3.6 GHz) achieves the simulated radiation efficiency of 96%, the measured peak gain of 9.2 dBi, 10 dB impedance bandwidth of 12.3%, four radiation nulls, and the cross-polarisation rejection larger than 22 dB within the 3-dB beam range at the centre frequency. The results show the features of high efficiency, multiple radiation nulls, wide bandwidth and high gain simultaneously while the reported DD patch antennas just have part of the features.

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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2018.1302
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