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왕가남(Jianan Wang),홍기표(Ki-Pyo Hong),전동하(Dong-Ha Jun),유상길(Sang-Gil Yu),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.9
In this paper, a dual-circularly polarized feed is proposed, which operates at 54-64GHz and consists of a square waveguide, a dielectric rod radiator, a septum polarizer and waveguide bends. A stepped taper is applied to the dielectric rod for the required gain and reflection coefficient. Heights and lengths of five steps on a thin metal plate polarizer inserted in the square waveguide are optimized to obtain the desired reflection coefficient at each port, the isolation between ports, and the axial ratio. E-plane bends are connected to the output parts of the septum polarizer for connection with the WR-15 waveguide. Fabrication and measurement show that the proposed feed has a reflection coefficient of less than -10dB and a transmission coefficient of less than -9.5dB at 57-64GHz, and at 60GHz, a maximum gain of 16.8dBic, a 15-dB taper beamwidth of 60°, an axial ratio of less than 2dB within ±30° from the feed axis.
임재홍(Jae-Hong Lim),왕가남(Jianan Wang),이주(Shu Li),방재훈(Jae-Hoon Bang),안병철(Bireng-Chearl Ahn) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.1
In this letter, a broadband circularly-polarized antenna is proposed for UHF RFID applications. The proposed antenna consists of three substrates, a metal cavity and four metal posts. The parasitic patch and radiation patch are realized on the upper and intermediate substrates, respectively. The 50-Ω feeding line puts on the lower substrate and provides successive 90° phase delays to the radiating patch through four metal posts. The width of the feeding line and a size of the radiating patch are firstly calculated with respect to the equivalent dielectric constant obtained from the commercial software. The optimally designed dimensions of the proposed antenna are obtained from the parametric studies. The optimally designed antenna is fabricated and measured to confirm its performances. Measurements show that the fabricated antenna has a reflection coefficient of less than -10dB over 735-979MHz, an axial ratio less than 5dB over 760-930MHz.