{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,11]],"date-time":"2026-03-11T21:00:44Z","timestamp":1773262844318,"version":"3.50.1"},"reference-count":27,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2016,12,9]],"date-time":"2016-12-09T00:00:00Z","timestamp":1481241600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61401110"],"award-info":[{"award-number":["61401110"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61661011"],"award-info":[{"award-number":["61661011"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Natural Science Foundation of Guangxi","award":["2015GXNSFBA139244"],"award-info":[{"award-number":["2015GXNSFBA139244"]}]},{"name":"Guangxi Key Laboratory of  Wireless Wideband Communication and Signal Processing","award":["GXKL06160109"],"award-info":[{"award-number":["GXKL06160109"]}]},{"name":"Innovation Project of GUET Graduate Education","award":["2016YJCX76"],"award-info":[{"award-number":["2016YJCX76"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this research, the novel concept of a resonance-based reflector (RBR) was proposed, and a ring-shaped RBR was utilized to design a unidirectional antenna with low-profile and broadband characteristics. Research found the ring operates as two half-wavelength (\u03bb\/2) resonators. Then, the resonance effect transforms the reflection phase of the ring RBR, and achieves a reflection phase of 0\u00b0 &lt; \u03d5 &lt; 180\u00b0 in a wide frequency range above the resonance. Then, the in-phase reflection characteristic (\u221290\u00b0 &lt; \u03d5 &lt; 90\u00b0) can be obtained in the wide frequency band by placing an antenna above the RBR with a distance smaller than \u03bb\/4. Two unidirectional antennas, named Case 1 and Case 2, were designed with the ring-shaped RBRs and bowtie antennas (RBR-BAs). The impedance bandwidths of Case 1 and the Case 2 are 2.04\u20135.12 GHz (86.3%) and 1.97\u20135.01 GHz (87.1%), respectively. The front-to-back ratio (FBR, an important parameter to measure the unidirectional radiation) of Case 1 ranges from 5\u20139.9 dB for frequencies 2.04\u20132.42 GHz, and the FBR of Case 2 ranges from 5\u201316 dB for frequencies 2.16\u20133.15 GHz. The proposed concept of RBR is desirable in wideband unidirectional antenna design, and the designing antennas can be used at the front end of wireless systems\u2014such as indoors communication, remote sensing, and wireless sensor systems\u2014for signal receiving or transmitting.<\/jats:p>","DOI":"10.3390\/s16122092","type":"journal-article","created":{"date-parts":[[2016,12,9]],"date-time":"2016-12-09T10:15:15Z","timestamp":1481278515000},"page":"2092","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Resonance-Based Reflector and Its Application in Unidirectional Antenna with Low-Profile and Broadband Characteristics for Wireless Applications"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1255-3118","authenticated-orcid":false,"given":"Lin","family":"Peng","sequence":"first","affiliation":[{"name":"Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China"},{"name":"Key Laboratory of Microwave and Optical Wave-Applied Technology, Guilin University of Electronic Technology, Guilin 541004, China"}]},{"given":"Ji-yang","family":"Xie","sequence":"additional","affiliation":[{"name":"Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China"}]},{"given":"Kai","family":"Sun","sequence":"additional","affiliation":[{"name":"Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China"}]},{"given":"Xing","family":"Jiang","sequence":"additional","affiliation":[{"name":"Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China"},{"name":"Key Laboratory of Microwave and Optical Wave-Applied Technology, Guilin University of Electronic Technology, Guilin 541004, China"}]},{"given":"Si-min","family":"Li","sequence":"additional","affiliation":[{"name":"Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China"}]}],"member":"1968","published-online":{"date-parts":[[2016,12,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"939","DOI":"10.1109\/LAWP.2009.2029530","article-title":"A broadband microstrip antenna with improved gain for noncontact vital sign radar detection","volume":"8","author":"Zivin","year":"2009","journal-title":"IEEE Antennas Wirel. 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