In this paper, a dual-port dual-frequency dual-mode antenna is proposed, and the low-frequency antenna is in horizontal polarization omnidirectional mode, operating at 2.38-2.57GHz, mainly by etching four annular slots in the patch and floor to increase the bandwidth and thereby changing the current path to make it a horizontal polarization omnidirectional radiation mode. The high-frequency antenna is a broadside radiation metasurface (MTS) antenna composed of 3 × 3 units. By opening a circular arc slot on the unit, the working frequency band is moved down, and the antenna works at 8.08-8.85 GHz. The overall size of the antenna is 60mm × 60mm × 3mm. The gain of the horizontal polarization omnidirectional antenna is 1.7 - 2.0 dBi in the operating band. The gain of the metasurface antenna is greater than 5 dBi in the operating frequency band.
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Qi et al. (2024) studied this question.
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