{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:01:38Z","timestamp":1760144498201,"version":"build-2065373602"},"reference-count":28,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2024,4,22]],"date-time":"2024-04-22T00:00:00Z","timestamp":1713744000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000038","name":"Natural Sciences and Engineering Research Council of Canada (NSERC)","doi-asserted-by":"publisher","award":["RGPIN-004974-2017","#5645 IPOC GRANT"],"award-info":[{"award-number":["RGPIN-004974-2017","#5645 IPOC GRANT"]}],"id":[{"id":"10.13039\/501100000038","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100008794","name":"Research Manitoba Innovation Proof of Concept Grant","doi-asserted-by":"publisher","award":["RGPIN-004974-2017","#5645 IPOC GRANT"],"award-info":[{"award-number":["RGPIN-004974-2017","#5645 IPOC GRANT"]}],"id":[{"id":"10.13039\/100008794","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this article, we present new design techniques to improve the gain and impedance bandwidth of short backfire antennas. For the gain enhancement procedure, our approach was to flare the rim of the antenna, which simultaneously led to an increase in the impedance bandwidth of the antenna. Parametric studies were carried out to obtain the optimal flaring angle. The peak realized gain was obtained as 17.2 dBi with an impedance bandwidth of 55% (2.4 dB and 28.6% increase in gain and bandwidth, respectively, compared to the unflared antenna). To further enhance the impedance bandwidth, an inductive iris was added to improve impedance matching at the waveguide aperture. We varied the width of the iris to obtain the optimal width that provided the best gain and impedance bandwidth result of 17.1 dBi and 66% (~40% increase compared to the unflared antenna without iris). To experimentally verify the work, prototypes were fabricated and tested. We found good agreement between simulation and measurement. The results of this study indicate that gain and bandwidth can be enhanced through optimized geometrical modification of the SBF structure. Furthermore, our 3D-printed technique demonstrates a mass reduction compared with conventional metallic structures.<\/jats:p>","DOI":"10.3390\/s24082654","type":"journal-article","created":{"date-parts":[[2024,4,22]],"date-time":"2024-04-22T06:10:18Z","timestamp":1713766218000},"page":"2654","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Gain and Bandwidth Enhancement of 3D-Printed Short Backfire Antennas Using Rim Flaring and Iris Matching"],"prefix":"10.3390","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0016-6102","authenticated-orcid":false,"given":"Yewande Mariam","family":"Aragbaiye","sequence":"first","affiliation":[{"name":"Department of Electrical & Computer Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9349-8076","authenticated-orcid":false,"given":"Dustin","family":"Isleifson","sequence":"additional","affiliation":[{"name":"Department of Electrical & Computer Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada"},{"name":"Centre for Earth Observation Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"110","DOI":"10.1109\/MAP.2009.5433109","article-title":"Design of short backfire antennas","volume":"51","author":"Kirov","year":"2009","journal-title":"IEEE Antennas Propag. Mag."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1138","DOI":"10.1109\/PROC.1965.4119","article-title":"The Short-Backfire Antenna","volume":"53","author":"Ehrenspeck","year":"1965","journal-title":"Proc. IEEE"},{"key":"ref_3","unstructured":"Ehrenspeck, H.W. (1967). High-Gain UHF Backfire Antenna for Communications, Telemetry, and Radio Astronomy, Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Aragbaiye, Y.M., Mansoori, A., Shafai, C., and Isleifson, D. (2022, January 12\u201314). Implementing a Prototype of a Short-Backfire Antenna Using Additive Manufacturing. Proceedings of the 2022 IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE), Winnipeg, MB, Canada.","DOI":"10.1109\/WiSEE49342.2022.9926776"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Aragbaiye, Y.M., and Isleifson, D. (2023). Mass Reduction Techniques for Short Backfire Antennas: Additive Manufacturing and Structural Perforations. Sensors, 23.","DOI":"10.3390\/s23218765"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"2138","DOI":"10.1109\/TAP.2019.2948492","article-title":"A Wideband High-Gain Planar Integrated Antenna Array for E-Band Backhaul Applications","volume":"68","author":"Fan","year":"2020","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"2868","DOI":"10.1109\/TAP.2019.2899008","article-title":"3-D Printed High-Gain Wideband Waveguide Fed Horn Antenna Arrays for Millimeter-Wave Applications","volume":"67","author":"Li","year":"2019","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"206","DOI":"10.1109\/TAP.2016.2631078","article-title":"60-GHz LTCC differential-fed patch antenna array with high gain by using soft-surface structures","volume":"65","author":"Jin","year":"2017","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"44050","DOI":"10.1109\/ACCESS.2018.2859835","article-title":"Mm-wave high gain cavity-backed aperture-coupled patch antenna array","volume":"6","author":"Zhu","year":"2018","journal-title":"IEEE Access"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Duangtang, P., Mesawad, P., and Wongsan, R. (July, January 28). Gain improvement of conical horn antennas by adding wire medium structure. Proceedings of the 2016 13th International Conference on Electrical Engineering\/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), Chiang Mai, Thailand.","DOI":"10.1109\/ECTICon.2016.7561301"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Shrestha, S., Baba, A.A., Abbas, S.M., Asadnia, M., and Hashmi, R.M. (2021). A horn antenna covered with a 3D-printed metasurface for gain enhancement. Electronics, 10.","DOI":"10.3390\/electronics10020119"},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Kampeephat, S., Krachodnok, P., and Wongsan, R. (2014, January 14\u201317). Gain improvement for conventional rectangular horn antenna with additional EBG structure. Proceedings of the 2014 11th International Conference on Electrical Engineering\/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), Nakhon Ratchasima, Thailand.","DOI":"10.1109\/ECTICon.2014.6839900"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Kampeephat, S., Krachodnok, P., and Wongsan, R. (2012, January 27\u201329). A study of gain enhancement of horn antenna using EBG. Proceedings of the 2012 IEEE Asia-Pacific Conference on Antennas and Propagation, Singapore.","DOI":"10.1109\/APCAP.2012.6333213"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"27","DOI":"10.7716\/aem.v7i4.614","article-title":"Gain enhancement of horn antenna using meta surface lens","volume":"7","author":"Kandan","year":"2018","journal-title":"Adv. Electromagn."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1337","DOI":"10.1109\/TAP.2022.3228631","article-title":"Gain Enhancement of Horn Antenna Using a Metal Lens","volume":"71","author":"Zhang","year":"2023","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Liu, Y., Isleifson, D., and Shafai, L. (2023). Gain Enhancement and Cross-Polarization Suppression of Cavity-Backed Antennas Using a Flared Ground Cavity and Iris. Sensors, 23.","DOI":"10.3390\/s23094389"},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Tianang, E.G., Elmansouri, M.A., and Filipovic, D.S. (2017, January 9\u201314). Wide bandwidth cavity-backed dual-polarized vivaldi array antenna. Proceedings of the 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings, San Diego, CA, USA.","DOI":"10.1109\/APUSNCURSINRSM.2017.8072698"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1","DOI":"10.6028\/jres.064D.003","article-title":"Effect of antenna size on gain, bandwidth, and efficiency","volume":"64D","author":"Harrington","year":"1960","journal-title":"J. Res. Natl. Bur. Stand. Sect. D Radio Propag."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"827","DOI":"10.1109\/TAP.2002.1017663","article-title":"Broad-band probe-fed patch antenna with a W-shaped ground plane","volume":"50","author":"Wong","year":"2002","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"5324","DOI":"10.1109\/TAP.2022.3161463","article-title":"Improving Compact Short Backfire Antenna Gain and Cross-Polarization using Choke and Ring Cavity Loading","volume":"70","author":"Mansoori","year":"2022","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Pathan, R., and Tripathi, A. (2023, September 01). Inclined Slots Waveguide Antenna Design. 2020. Available online: https:\/\/ssrn.com\/abstract=3573535.","DOI":"10.2139\/ssrn.3573535"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Nessel, J.A., Kory, C.L., Lambert, K.M., Acosta, R.J., and Miranda, F.A. (2006, January 9\u201314). A microstrip patch-fed short backfire antenna for the tracking and data relay satellite system\u2014Continuation (TDRSS-C) Multiple Access (MA) array. Proceedings of the 2006 IEEE Antennas and Propagation Society International Symposium, Albuquerque, NM, USA.","DOI":"10.1109\/APS.2006.1710574"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"22957","DOI":"10.1038\/s41598-023-50174-5","article-title":"3D-printed low-cost choke corrugated Gaussian profile horn antenna for Ka-band","volume":"13","author":"Torres","year":"2023","journal-title":"Sci. Rep."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"811","DOI":"10.1007\/s10762-019-00610-3","article-title":"Gain and Bandwidth Improvement of Empty Substrate Integrated Waveguide H-plane Horn Antenna at W-band","volume":"40","author":"Qi","year":"2019","journal-title":"J. Infrared Millim. Terahertz Waves"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"108","DOI":"10.1038\/s41467-018-08032-w","article-title":"A metamaterial-enabled design enhancing decades-old short backfire antenna technology for space applications","volume":"10","author":"Binion","year":"2019","journal-title":"Nat. Commun."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1917","DOI":"10.1109\/LAWP.2023.3269402","article-title":"Development of a Low-Cost Lightweight Advanced K-Band Horn Antenna With Charge-Programmed Deposition 3D Printing","volume":"22","author":"Wang","year":"2023","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"012068","DOI":"10.1088\/1742-6596\/1902\/1\/012068","article-title":"Horn antenna with integrated metamaterial for beam steering","volume":"1902","author":"Ishchenko","year":"2021","journal-title":"J. Phys. Conf. Ser."},{"key":"ref_28","unstructured":"Pasternack (2024, January 01). WR-284 Waveguide Standard Gain Horn Antenna. Available online: https:\/\/www.pasternack.com\/images\/ProductPDF\/PE9860-SF-15.pdf."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/24\/8\/2654\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T14:32:03Z","timestamp":1760106723000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/24\/8\/2654"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,4,22]]},"references-count":28,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2024,4]]}},"alternative-id":["s24082654"],"URL":"https:\/\/doi.org\/10.3390\/s24082654","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2024,4,22]]}}}