Abstract:This paper presents a design method for addressing the challenge of accommodating a large number of multi-system carrier antennas by proposing a wideband shared aperture compound antenna based on a printed dipole structure. The shared aperture design incorporates two distinct forms of printed dipoles: a planar printed dipole for achieving a wideband high-gain linear polarization antenna with a wideband directional coupler for sun-difference pattern radiation, and a cross dipole low-gain antenna for circular polarization radiation. These antenna elements are printed on the same microwave dielectric substrate, and the mutual interference between them is mitigated through techniques including antenna unit layout optimization, relative positioning, and the use of isolation rings. The test results show that the VSWR is less than 1.8, the gain is greater than 13.5dBi, the azimuth difference beam zero depth is less than -25dB of the linear polarized antenna in the range of 1.2GHz ~ 1.8GHz; and the VSWR is less than 1.6, the gain is more than 6.5dBi, the axial ratio is less than 2.5dB of the circularly polarized antenna in the range of 1.2GHz ~ 1.8GHz. The proposed design is capable of fulfilling the requirements of various wireless communication systems by reducing the number of antennas, thereby effectively saving space on the carrier platform. The compound antenna holds great potential for diverse applications, thanks to its simple and compact structure, low profile, and ease of engineering implementation.
