Improvement in Depth–of–Return-Loss and Augmentation of Gain-bandwidth with Defected Ground Structure For Low Cost Single Element mm–Wave Antenna

The present research involves the design, fabrication & testing of a low-cost wide-band mm-Wave prototype antenna.The FR4 structure was composed of a Defective Ground Structure (DGS), a Concentric Circle at the bottom edges, and a Rectangular Radiating Patch (RRP) etched with a circle.To improve gain for a wider spectrum, the DGS is created by etching a dumbbell in the center and two semi-elliptical slots at the upper edges.3.89 GHz) is found to have a bandwidth of -10 dB, and 99% power is obtained with a mismatch loss of less than 0.044 dB for the 30-31.59GHz band.Additionally, it has a 5-dBi enormous gain-bandwidth of 2.50 GHz (30.47-32.97GHz)& a 3-dBi gain-bandwidth of 3.89 ).Furthermore, four gain peaks are attained: 9.83 dBi at 31.3 GHz, 8.15 dBi at 32.64 GHz, 6.16 dBi at 33.47 GHz, and 6.05 at 33.74 GHz.Axial ratio, group delay, and directivity are a few more quality metrics that are examined.Anechoic chamber and Rohde & Schwarz ZNB 40 Vector Network Analyzer (VNA) Bench are used to measure antenna parameters.The constructed framework is appropriate for 5G and beyond intelligent network based next-generation (5G) communications, as well as 5G Local Multipoint Distribution Services (LMDS) applications in the mm-Wave range and futuristic robotic control devices.Lastly, an equivalent circuit for the suggested structure is created and examined.