A stable high gain cylindrical dielectric resonator antenna (CDRA) based on high-order mode HEM 11δ+2 is proposed. This design simplifies the complexity of the structure, combined with wideband feeding method, and exhibits a significant high gain performance over the operating band at the center frequency of 8 GHz. First, the high-order mode of CDRA is successfully excited through a wideband technique, achieving a 11.6% impedance bandwidth and a flat high gain of around 12.4 dBi. Then, a DRA array consisting of four elements is designed, with an impedance bandwidth of 13.7% and a stable realized gain as high as 17.8 dBi that is much higher than the gain of traditional DRA arrays
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Wu et al. (2024) studied this question.
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