A Novel Procedure To Hybridize The Folded Transmitarray and Fabry Perot Cavity With Low Antenna Profile and Flexible Design Frequency

The previously reported procedure to hybridize the high-band folded-transmitarray (FTA) and the low-band Fabry- Perot-cavity-antenna (FPCA) adopts the λ_low/2 FPCA as the basic antenna, the FTA is then integrated with the FPCA. The aperture size and profile of the implemented antenna are highly correlated to the λ_low which restricts further profile shrunk and designable λ_low under a given aperture size. A novel procedure tackling these issues is proposed. A double-folded FTA (DFFTA) whose profile is 1/4 of the focal length is first adopted as the basic antenna under a given aperture size. Then, an FPCA with an Artificial-Magnetic- Conductor (AMC) loaded ground is integrated with the DFFTA. The aperture size and the profile of the implemented antenna are completely determined by the DFFTA which has no correlations of the λ_low. An aperture-shared dual-band antenna with a lower profile at both operating bands can be designed by this procedure. Further, the λ_low can be freely chosen under a given aperture size and profile. An aperture-shared surface offering partial-reflection at 3.5 GHz and phase-correction at 28 GHz, and an aperture- shared multi-functional ground offering polarization conversion at 28 GHz and phase compensation at 3.5 GHz are proposed to execute the proposed procedure.