In this paper, a compact multi-split-ring resonator-based antenna is presented for wireless applications. The proposed antenna integrates multiple resonators to achieve multiband operation, where each resonator corresponds to a specific frequency band. A theoretical analysis is conducted to model the equivalent circuit of the proposed antenna, followed by an analytical study to calculate the resonant frequency of each resonator. By integrating these resonators, the proposed antenna achieves a compact size of 23 × 24 × 1.6 mm³ (0.19 × 0.2 × 0.01λ³), resulting in a size reduction of 81.6% compared to a conventional patch antenna, while maintaining gain, improving bandwidth, and providing excellent impedance matching. The proposed antenna covers the 2.4–2.8 GHz (14.55%), 3.25–3.75 GHz (14.28%) and 4.5–7.84 GHz (54.13%) frequency bands, providing acceptable gains of 1.5 dBi, 2 dBi and 3.2 dBi, respectively. The antenna was designed with CST, its performance was verified with HFSS simulations and it was validated with an equivalent circuit in ADS. Finally, the antenna was fabricated to confirm the accuracy and reliability of the simulation results, and it was found that the measurements agreed well with the simulations. This multiband functionality, combined with a compact form factor and simple feed line, makes the antenna cost-effective, easy to manufacture and suitable for various wireless communication applications, including 5G sub-6 GHz mid-band (2.5/3.5/5/5 GHz), RFID (2.45/5.8 GHz), WiMAX (2.4/3.5/5.8 GHz), Wi-Fi 5/6/6E (2.4/5/6 GHz) and WLAN (5.2/5.8 GHz).

In this research work, the design of a dipole antenna based on metamaterials is proposed, which can be used as a high gain multiband communication device for RFID applications. This antenna is printed on two sides of an Arlon substrate, which has an overall electrical dimension of . The metamaterials are used to obtain a multiband antenna, and their integration technique into the antenna results in a high gain compared to a conventional antenna without any magnification or additional layer. The simulated and measured results show that the proposed antenna can operate at 0.88-0.97 GHz, 2.41-2.48 GHz, and 5.77-5.91 GHz with a reflection coefficient of less than −10 dB, which make it well suited for RFID at 860-960 MHz and 2.4 GHz/5.8 GHz. All these resonant frequencies show better impedance matching with high gain. The proposed antenna has the advantages of simple design, low profile, easy feeding, low manufacturing cost, and easy integration into the electronic circuit.

A new design of a periodic Metamaterials on the radiating patch antenna is presented in this paper. This method is used to improve the total radiation efficiency and optimize return loss S11 at resonance frequency of RFID rectangular patch antenna. Based on the simulation results, we found that the proposed metamaterials antenna has a maximum radiation efficiency of 95%, higher gain of 7dB, very narrow bandwidth of 40 MHZ and a better adaptation of -28dB in the operating frequency.

In this paper, a high gain multiband patch antenna is designed and analyzed for use in wireless applications. Coupled sub‐patches are integrated around a central hexagonal patch to extend the operating frequency and improve gain across multiple frequency bands. These sub‐patches modify the current distribution within the antenna and allow the excitation of multiple TM modes at different frequencies. An analytical study is conducted and validated through an equivalent circuit model to accurately determine the resonant frequencies of the proposed antenna. The results indicate that the proposed antenna achieves a gain of 4 dB at 3.6 GHz and a high gain of 9 dB at 5.2, 5.8, and 6.4 GHz, confirming its suitability for multiband applications. It supports multiple resonant modes, including TM₁₁, TM₁₂ and TM₃₁. The maximum gain of the antenna is improved by 3 dB due to the integration of sub‐ surfaces without an additional layer. Efficiency has also improved, from 81% with the conventional design to 95% with the coupled sub‐patches. The antenna exhibits circular polarization across all its resonant frequency bands. The proposed antenna was first designed in CST, then its performance was evaluated with HFSS to verify its design, and the equivalent circuit was validated with ADS. Finally, the antenna was fabricated and measured.