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The integration of sub-6 conformal patch antennas with an mm-wave reflector is proposed in this communication as a compact multiband antenna solution. Using the concept of shared-aperture antenna, patch antennas are placed on the surface of a reflector to obtain a dual-frequency band antenna without increasing the total volume of the system. The key aspect of the design is the use of a substrate thickness for the patches that is an integer multiple of0.5λ ₀at the reflector operating frequency, to obtain in-phase reflections and minimize disturbance to reflector operation. As a proof of concept, a 28-GHz off-axis reflector antenna with a sub-6 dual-band U-shaped conformal patch antenna has been designed, simulated, manufactured, and measured.
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Poyanco et al. (2024) studied this question.
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