@article{abdelgwad_2026,  title={Frequency-Tunable Antenna Using IFA-to-Loop Mode Switching for Compact Wireless Devices},  volume={25},  ISSN={2179-1074},  url={https://doi.org/10.1590/2179-10742026v25i2302643},  DOI={10.1590/2179-10742026v25i2302643},  number={2},  journal={Journal of Microwaves, Optoelectronics and Electromagnetic Applications},  publisher={Sociedade Brasileira de Microondas e Optoeletrônica e Sociedade Brasileira de Eletromagnetismo},  author={Abdelgwad, Ahmad H.},  year={2026},  pages={e2026302643} }