Miniaturized Flexible Antenna Performance Analysis using Substrate Integrated Waveguide (SIW)

The proposed compact Rectangular Microstrip Antenna (RMSA) design embedded with a Substrate Integrated Waveguide (SIW) is presented. In order to achieve significant miniaturisation without sacrificing performance, the antenna was designed using a flexible textile substrate (εr = 2.75, thickness = 1.5 mm). The implications of adding SIW structure to flexible microstrip antennas were thoroughly examined in this paper. SIW's impact on patch antennas depends on a variety of variables, including the number, diameter, position, and spacing. An investigation was conducted to investigate the effect of altering the diameter, quantity, and placement of vias utilised for SIW. The findings show that SIW integrated into an antenna can drastically reduce its size without sacrificing performance. Additionally, the results demonstrate that multifrequency functioning, better impedance matching, and less cross-polarization may all be achieved by optimising SIW setups. The suggested design is straightforward, small (λ/7), and appropriate for on-body usage in a range of situations.