A Compact Share-Aperture Antenna With Pattern/Polarization Diversity for 5G Sub-6G Applications

Abstract

A compact share-aperture antenna with pattern/polarization diversity is presented for fifth-generation (5G) Sub-6G applications in this brief. The even and odd modes of the coplanar waveguide (CPW) constructions, respectively, activate the monopole and Vivaldi antennas, which make up the suggested antenna. Additionally, gain is increased while back radiation and edge effects are reduced by using the defected ground structure (DGS). By varying the excitation amplitude and phase of the two ports, the proposed antenna can operate in four different modes: mode 1 (omnidirectional), mode 2 (broadside), mode 3 (left titled) and mode 4 (right titled). The entire dimension is <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.667\mathbf {\mathrm {\lambda }} _{0} \mathbf {\times } 0.500\mathbf {\mathrm {\lambda }} _{0} \mathbf {\times } 0.007\mathbf {\mathrm {\lambda }} _{0}$ </tex-math></inline-formula> (where <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mathbf {\mathrm {\lambda }} _{0}$ </tex-math></inline-formula> is the free space wavelength at 2 GHz). The four modes collectively span a 100% −10 dB impedance bandwidth (2-6 GHz). In the common bandwidth (2-6 GHz, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\unicode{0x007C}\text{S}_{11}\,\,\unicode{0x007C}\mathbf { &lt; }-$ </tex-math></inline-formula> 10 dB), the isolation between the two ports is more than 25 dB. The suggested design has been produced and tested, and the measured results match the simulations well.