This research presents a MIMO antenna design optimizing gain and efficiency in the n78 frequency band, suggesting improved applications in wireless communications.
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.
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Bhargava et al. (2026) studied this question.
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