• Anjali Sharma

The work presented in this paper incorporates the Defective Ground Structure (DGS) technique with multiple octagonal microstrip patches for high-frequency applications such as 5G and related spectrum bands such X, Ku, K, Ka etc. With dimensions of 28 mm in width, 32 mm in length, and a height of 1.57 mm, the antenna is designed on an RT Duroid 5880 substrate known for its low dielectric constant of 2.2 and minimal loss, ensuring optimal performance at higher frequencies. The DGS method, implemented by introducing specific patterns into the ground plane, significantly enhances the bandwidth and impedance characteristics of the antenna reducing interference between the patches. The unique octagonal patch design helped to enhance the radiation pattern and overall gain terms of return loss and impedance matching. Through parametric analysis, it is observed that at approx 30 GHz, the antenna exhibited a return loss (S11) below -10 dB and an excellent Voltage Standing Wave Ratio (VSWR) of 1.19, indicating good impedance matching. Furthermore, the antenna has peak gain of 23.69 dB, which is favorable for high-frequency communication applications. Thus the optimized structure, combining DGS enhancements with multiple octagonal patches, offers potential for use in 5G and other high frequency wireless applications.

Multiband, microstrip patch, and defective ground structure (DGS).

"Analysis of Octagonal Shaped Multiband Microstrip Antenna with Defective Ground Technique for 5G and IoT Applications", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 1, page no.g867-g876, January-2025, Available :http://www.jetir.org/papers/JETIR2501693.pdf

"Analysis of Octagonal Shaped Multiband Microstrip Antenna with Defective Ground Technique for 5G and IoT Applications", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 1, page no. ppg867-g876, January-2025, Available at : http://www.jetir.org/papers/JETIR2501693.pdf