{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,14]],"date-time":"2026-05-14T23:07:05Z","timestamp":1778800025562,"version":"3.51.4"},"reference-count":27,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2023,10,13]],"date-time":"2023-10-13T00:00:00Z","timestamp":1697155200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"King Saud University, Riyadh, Saudi Arabia","award":["RSPD2023R868"],"award-info":[{"award-number":["RSPD2023R868"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A pattern reconfigurable antenna, composed of eight elements, is proposed for energy harvesting applications. Pattern reconfigurable antennas are a promising technique for harvesting from different wireless sources. The radiation pattern of the proposed antenna can be steered electronically using an RF switch matrix, covering an angle range from 0 to 360 degrees with a step size of 45 degrees. The proposed antenna primarily consists of an eight-dipole configuration that shares the same excitation. Each dipole is excited using a balun comprising a quarter-wavelength grounded stub and a quarter-wavelength open-circuit stub. The proposed antenna operates in the frequency range of 4.17 to 4.5 GHz, with an impedance bandwidth of 7.6%. By switching between the different switches, the antenna can be steered with a narrower rotational angle. In addition, the antenna can work in an omnidirectional mode when all switches are in the ON state simultaneously. The results demonstrate a good agreement between the numerical and experimental findings for the reflection coefficient and radiation characteristics of the proposed reconfigurable antenna.<\/jats:p>","DOI":"10.3390\/s23208451","type":"journal-article","created":{"date-parts":[[2023,10,13]],"date-time":"2023-10-13T10:16:12Z","timestamp":1697192172000},"page":"8451","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["A Pattern Reconfigurable Antenna Using Eight-Dipole Configuration for Energy Harvesting Applications"],"prefix":"10.3390","volume":"23","author":[{"given":"Mohamed","family":"Aboualalaa","sequence":"first","affiliation":[{"name":"Microstrip Department, Electronics Research Institute, Cairo 11843, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0136-7512","authenticated-orcid":false,"given":"Hesham A.","family":"Mohamed","sequence":"additional","affiliation":[{"name":"Microstrip Department, Electronics Research Institute, Cairo 11843, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3212-8493","authenticated-orcid":false,"given":"Thamer A. H.","family":"Alghamdi","sequence":"additional","affiliation":[{"name":"Wolfson Centre for Magnetics, School of Engineering, Cardiff University, Cardiff CF24 3AA, UK"},{"name":"Electrical Engineering Department, School of Engineering, Albaha University, Albaha 65779, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0647-5459","authenticated-orcid":false,"given":"Moath","family":"Alathbah","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,10,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"187","DOI":"10.1002\/mop.28069","article-title":"Pattern and frequency reconfigurable monopole disc antenna using PIN diodes and MEMS switches","volume":"56","author":"Elsadek","year":"2014","journal-title":"Microw. Opt. Technol. Lett."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Yahya, M.S., Soeung, S., Singh, N.S.S., Yunusa, Z., Chinda, F.E., Rahim, S.K.A., Musa, U., Nor, N.B.M., Sovuthy, C., and Abro, G.E.M. (2023). Triple-Band Reconfigurable Monopole Antenna for Long-Range IoT Applications. Sensors, 23.","DOI":"10.3390\/s23125359"},{"key":"ref_3","unstructured":"Al-Alaa, M.A., Elsadek, H.A., Abdallah, E.A., and Hashish, E.A. (2014, January 6\u201312). PIFA frequency reconfigurable antenna. Proceedings of the 2014 IEEE Antennas and Propagation Society International Symposium (APSURSI), Memphis, TN, USA."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1007","DOI":"10.1109\/LAWP.2022.3154484","article-title":"A Frequency-Reconfigurable Planar Slot Antenna Using S-PIN Diode","volume":"21","author":"Jin","year":"2022","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"181","DOI":"10.1007\/s10470-020-01767-x","article-title":"Design and analysis of reconfigurable fractal antenna with RF-switches on a flexible substrate for X-band applications","volume":"107","author":"Sailaja","year":"2021","journal-title":"Analog. Integr. Circuits Signal Process."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"17","DOI":"10.1016\/j.jesit.2014.03.008","article-title":"Compact multi-band frequency reconfigurable planar monopole antenna for several wireless communication applications","volume":"1","author":"Elsadek","year":"2014","journal-title":"J. Electr. Syst. Inf. Technol."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"11389","DOI":"10.1109\/TAP.2022.3209185","article-title":"A Reconfigurable Patch Antenna with Linear and Circular Polarizations Based on Double-Ring-Slot Feeding Structure","volume":"70","author":"Zhang","year":"2022","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"642","DOI":"10.1049\/iet-map.2018.5602","article-title":"Stable-multiband frequency reconfigurable antenna with improved radiation efficiency and increased number of multiband operations","volume":"13","author":"Kumar","year":"2019","journal-title":"IET Microw. Antennas Propag."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"784","DOI":"10.1109\/LAWP.2022.3146599","article-title":"A Planar Pattern-Reconfigurable Antenna with Stable Radiation Performance","volume":"21","author":"Zhao","year":"2022","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"199","DOI":"10.1109\/LAWP.2022.3207199","article-title":"Wideband Pattern-Reconfigurable Antenna with Switchable Monopole and Vivaldi Modes","volume":"22","author":"Yuan","year":"2023","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Morshed, K.M., Karmokar, D.K., Esselle, K.P., and Matekovits, L. (2023). Beam-Switching Antennas for 5G Millimeter-Wave Wireless Terminals. Sensors, 23.","DOI":"10.3390\/s23146285"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"396","DOI":"10.1109\/LAWP.2021.3133474","article-title":"A Wideband Pattern-Reconfigurable Loop Antenna Designed by Using Characteristic Mode Analysis","volume":"21","author":"Li","year":"2022","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1086","DOI":"10.1002\/cta.2637","article-title":"Analysis and design of an integrated RF energy harvester for ultra low-power environments","volume":"47","author":"Caselli","year":"2019","journal-title":"Int. J. Circuit Theory Appl."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Mouapi, A. (2022). Radiofrequency Energy Harvesting Systems for Internet of Things Applications: A Comprehensive Overview of Design Issues. Sensors, 22.","DOI":"10.3390\/s22218088"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Chang, H.-C., Lin, H.-T., and Wang, P.-C. (2023). Wireless Energy Harvesting for Internet-of-Things Devices Using Directional Antennas. Futur. Internet, 15.","DOI":"10.3390\/fi15090301"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"9972","DOI":"10.1109\/TPEL.2023.3272586","article-title":"A Self-Powered Synchronous Switch Energy Extraction Circuit for Electromagnetic Energy Harvesting Enhancement","volume":"38","author":"Xie","year":"2023","journal-title":"IEEE Trans. Power Electron."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"355","DOI":"10.1109\/LMWC.2022.3217459","article-title":"Design of Dual-Band Inverse Class-F Rectifier for Wireless Power Transfer and Energy Harvesting","volume":"33","author":"Nguyen","year":"2023","journal-title":"IEEE Microw. Wirel. Technol. Lett."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"892","DOI":"10.1049\/iet-cds.2020.0013","article-title":"Dual-band CPW rectenna for low input power energy harvesting applications","volume":"14","author":"Aboualalaa","year":"2020","journal-title":"IET Circuits Devices Syst."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Eidaks, J., Kusnins, R., Babajans, R., Cirjulina, D., Semenjako, J., and Litvinenko, A. (2023). Efficient Multi-Hop Wireless Power Transfer for the Indoor Environment. Sensors, 23.","DOI":"10.3390\/s23177367"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"8277","DOI":"10.1016\/j.aej.2022.01.045","article-title":"A reconfigurable class-F radio frequency voltage doubler from 650 MHz to 900 MHz for energy harvesting applications","volume":"61","author":"Mansour","year":"2022","journal-title":"Alex. Eng. J."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"493","DOI":"10.1109\/LWC.2021.3133623","article-title":"Dynamic RF Combining for Multi-Antenna Ambient Energy Harvesting","volume":"11","author":"Lopez","year":"2022","journal-title":"IEEE Wirel. Commun. Lett."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"262","DOI":"10.1109\/LAWP.2011.2136371","article-title":"Investigation of Rectenna Array Configurations for Enhanced RF Power Harvesting","volume":"10","author":"Olgun","year":"2011","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"4931","DOI":"10.1109\/TAP.2021.3138542","article-title":"An Omnidirectional Rectenna Array with an Enhanced RF Power Distributing Strategy for RF Energy Harvesting","volume":"70","author":"Sun","year":"2022","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_24","unstructured":"Ali, M. (2021). Reconfigurable Antenna Design and Analysis, Artech House."},{"key":"ref_25","unstructured":"(2023, June 01). Available online: www.minicircuits.com\/pdfs\/USB-8SPDT-A18.pdf."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"100","DOI":"10.1109\/8.210122","article-title":"Equivalent circuit of a dipole antenna using frequency-independent lumped elements","volume":"41","author":"Tang","year":"1993","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_27","unstructured":"Qualcomm Technologies Inc (2021, March 16). Spectrum for 4G and 5G. Available online: https:\/\/www.qualcomm.com\/media\/documents\/files\/spectrum-for-4g-and-5g.pdf."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/23\/20\/8451\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T21:06:35Z","timestamp":1760130395000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/23\/20\/8451"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,10,13]]},"references-count":27,"journal-issue":{"issue":"20","published-online":{"date-parts":[[2023,10]]}},"alternative-id":["s23208451"],"URL":"https:\/\/doi.org\/10.3390\/s23208451","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,10,13]]}}}