Circularly polarized hybrid mode substrate integrated waveguide antenna for two quadrant scanning beamforming applications for 5G

Abstract

Electromagnetic band gap (EBG) based two ports multiple-input and multipleoutput (MIMO) substrate integrated waveguide (SIW) antenna for two quadrant beamforming applications using metasurfaces (MS) is addressed. A novel SIW structure is employed to achieve beamforming. This work comprises two types of vias having different diameters and lengths in order to achieve multibeam in the first and second quadrant with 120 coverage. Two cross slots tilted at AE45 are etched on top of the structure. The width variation of one of the cross slots achieved beam scanning in first quadrant with coverage of 90 . Additionally, four circular slots are etched on the top metallic layer to improve the axial ratio and the gain of the antenna. Apart from that, two diagonally etched slots help to enhance the gain and radiation properties of the antenna. Furthermore, to get the good mutual coupling and isolation between the two ports, EBG unit cells are deployed on the ground. The proposed antenna shows good right hand circularly polarized radiation within the band with the help of MS deployed on an extended part of the substrate. MS also improves the return loss bandwidth. In the end, the diversity properties of the MIMO have been studied as well. The proposed antenna shows good performance in all respects for 5G applications.

Design of a Low Sidelobe Feed Network Based on the Louver-Shaped Defected Ground Structure

“…When the louver-shaped DGS is introduced at point A (above the arm of the power divider), the impedance (Z 2 ′ ) of the circuit where the louver-shaped DGS is located increases, leading to a corresponding increase in phase. Tis results in a decrease in the output power of Port 2, as indicated by equation (7). Simultaneously, the output power of Port 3 increases.…”

“…It can be implemented in various forms, such as air-dielectric striplines, microstrip lines, dielectric striplines, and waveguides. Verma and Raghava [7] propose a dual-port multi-input multi-output (MIMO) substrate integrated waveguide (SIW) antenna based on electromagnetic band gap (EBG) technology. Rao et al [8] introduce a novel MIMO antenna design using the defective ground structure with microstrip line-feeding network as the feeding mechanism.…”

Quad Port Multipolarized Reconfigurable MIMO Antenna for Sub 6 GHz Applications

“…. CP [19][20][21][22][23][24] antennas are highly requisite for a rich multipath environment since it diminishes the multipath interferences and are insensitive to antenna orientation between the transmitter and receiver. To attain these dominant characteristics of CP, a parasitic stub is attached to the ofset-fed ETRP radiator (Antenna 1) with a length of 11.75 mm.…”

Theory and design of quasi‐lumped‐element wideband filtering phase shifters

“…One is to enhance the operating bandwidth, and another is to integrate beamforming function in RF front-end for base station antenna arrays, 1,2 that can split a sector to multiple ones with multiple beams. As the essential element to improve the bandwidth of the beamshaped patterns, wideband phase shifter has made a rapid development, including Schiffman type, 3,4 broadside coupling type, 5,6 stub-loaded type, 7,8 reflection-type, 9 high-/low-pass networks (HPN/LPN), 10 all-pass network (APN), 11 resonators type, 12 and so on.…”