Title: Design, development and analysis of CPW fed circular patch MIMO antenna with miniaturised ground plane for n78 band applications

Authors: D.S. Bhargava; G. Seetharaman

Addresses: Department of Electronics and Communication Engineering, Indian Institute of Information Technology Tiruchirappalli, Tiruchirappalli, 620012, Tamil Nadu, India ' Department of Electronics and Communication Engineering, Indian Institute of Information Technology Tiruchirappalli, Tiruchirappalli, 620012, Tamil Nadu, India

Abstract: This research paper, presents a coplanar waveguide (CPW) feed Circular Slotted Microstrip Patch Antenna (CS-MPA) with miniaturised ground structure, which operates at the n78 band (3.2-3.8 GHz) and resonates at LTE-42 Band (3.55 GHz) is presented. The antenna structure (single-element) designed is of 55 × 30 × 1.6 mm³ on FR-4 substrate material with 1.6 mm thickness, dielectric constant (epsilon value) of substrate is 4.6 and the loss tangent value is of 0.001. The antenna offers reflection coefficient value of less than -10 dB over the entire n78 band of interest and VSWR value lies between 1 and 2. The Gain and directivity of the designed antenna is 3.154 dBi and 5.266 dBi at 3.55 GHz respectively. The overall efficiency of the antenna is 61.485% at 3.55 GHz frequency. The orthogonally placed 4 element MIMO antennas with the overall dimensions of 100 × 100 × 1.6 mm³ exhibits better isolation between the adjacent antenna elements.

Keywords: microstrip patch antenna; CPW; coplanar waveguide; n78 band; optimised ground structure; 5G communication; WiMAX services.

DOI: 10.1504/IJAACS.2026.152276

International Journal of Autonomous and Adaptive Communications Systems, 2026 Vol.19 No.1, pp.29 - 57

Received: 10 Apr 2025
Accepted: 05 Aug 2025
Published online: 13 Mar 2026 *

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