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Arinze, Stella N. and Nwajana, Augustine O. ORCID: https://orcid.org/0000-0001-6591-5269 (2026) A comprehensive review of battery‐free energy efficient RF and microwave systems. Journal of Engineering:4227736. pp. 1-36. ISSN 2314-4904 (Print), 2314-4912 (Online) (doi:10.1155/je/4227736)

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Nwajana, Augustine O. ORCID: https://orcid.org/0000-0001-6591-5269, Arinze, Stella N. and Ebenuwa, Solomon H. (2025) Filtering antenna design and implementation techniques: applications, recent developments, challenges, and future opportunities. Journal of Engineering, 2025:8948687. pp. 1-20. ISSN 2314-4904 (Print), 2314-4912 (Online) (doi:10.1155/je/8948687)