This paper presents a novel Fabry-Perot cavity an-tenna (FPCA) with wideband gain enhancement and unidirectional frequency scanning characteristics. Two types of PRS with broadband large reflection magnitude are utilized to realize a wide 3 dB gain bandwidth. Additionally, the proposed antenna also has a unidirectional frequency scanning characteristic due to the phase difference that varies with frequency. The final results show that the FPCA with a simple structure has a 10 dB impe-dance bandwidth of 7.19-25.4 GHz (112%) and a 3 dB gain band-width of 7.39-23.23 GHz (103.37%) with a peak gain of 15.72 dBi at 22.4 GHz. In 7.39-13.9 GHz, it has a frequency scanning angle range of approximately 0-45°.
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Zhu et al. (2024) studied this question.
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