In this paper, theoretical analysis of microstrip line fed rectangular patch antenna loaded with parasitic element and split-ring resonator is presented. The proposed antenna shows that the dualband operation depends on gap between parasitic element, split-ring resonator, length and width of microstrip line. It is found that antenna resonates at two distinct resonating modes i.e., 0.9 GHz and 1.8 GHz for lower and upper resonance frequencies respectively. The antenna shows dual frequency nature with frequency ratio 2.0. The characteristics of microstrip line fed rectangular patch antenna loaded with parasitic element and split-ring resonator antenna is compared with other prototype microstrip line fed antennas. Further, the theoretical results are compared with simulated and reported experimental results, they are in close agreement.

In this paper, a compact 2×4 microstrip antenna (MSA) array is presented and the effect of inserting shorting wall is optimized with the help of artificial neural network (ANN). An ANN model has been developed for predicting the resonant frequencies with the variation of the height of substrate and shorting wall position. For validation of ANN output, a prototype of 2×4 MSA array is physically fabricated and tested. This validation verifies the proposed antenna for which simulated and ANN results are approximately similar.

The manuscript presents the design and investigation of a dual-port 4 × 4 plasmonic MIMO antenna using aluminium and copper on a silicon dioxide substrate for nanophotonic applications. Initially, the plasmonic properties of the materials, such as permittivity and refractive index, are studied using Drude and Lorentz equations. It is observed that the designed hexagonal-shaped plasmonic MIMO antenna radiates at multiple frequencies. The single-port aluminium and copper MIMO antennas are radiating at 86 and 4 THz with a minimum reflection level of -32.13 dB and − 43.39 dB, respectively. Furthermore, these antennas show a gain value of 5.625 dBi and 7.10 dBi, respectively, at the resonance. Additionally, the dual-port aluminium and copper antennas exhibit gains of 18.9 dBi and 9.9 dBi at 36 and 35 THz, respectively. The MIMO performance metrics, such as ECC, DG, MEG, CCL and TARC of both single and dual-port antennas, are within the desirable limit required for the nanophotonic communication. Further, the designed nanophotonic circuit of the hexagonal MIMO antenna is compared with the finite integration technique.