A broadband bifocal conformal transmitarray antenna with wide scanning angles

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Abstract

Abstract Transmitarray (TA) antenna has great research value based on its unique advantages of low profile, high gain, and flexible performance, especially in the field of spaceborne, airborne, and unmanned aerial vehicles. Unfortunately, traditional TA antennas are usually of flat structures, which lack conformal flexibility and installation simplicity in certain complex application scenarios. In this letter, a broadband bifocal conformal TA antenna is proposed based on a designed concave‐cylindrical‐shaped triple‐layer TA surface with phase modulation capability. The broadband bifocal conformal TA antenna is simulated, fabricated, and measured by assembling the TA surface with a dual‐mode conical horn as a feed antenna. To better demonstrate the beam scanning stability of the bifocal TA antenna, a monofocal TA antenna is designed and simulated as a comparison. Simulation and experimental results confirm that the proposed bifocal conformal TA antenna can achieve a high gain of 24.4 dBi at 30 GHz and a 3‐dB gain bandwidth of 13.3% (27.4–31.3 GHz) under normal incidence. Antenna peak gain fluctuation is less than 1 dB with a maximum beam scanning range of , which is much more stable than that of the monofocal TA antenna (3.6 dB). The proposed design can be a promising candidate in many military and civilian application scenarios.

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