title: Resonance-Based Reflector and Its Application in Unidirectional Antenna with Low-Profile and Broadband Characteristics for Wireless Applications.
abstract: 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 (λ/2) resonators. Then, the resonance effect transforms the reflection phase of the ring RBR, and achieves a reflection phase of 0° <ϕ< 180° in a wide frequency range above the resonance. Then, the in-phase reflection characteristic (-90° <ϕ< 90°) can be obtained in the wide frequency band by placing an antenna above the RBR with a distance smaller thanλ/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 2.04-5.12 GHz (86.3%) and 1.97-5.01 GHz (87.1%), respectively. The front-to-back ratio (FBR, an important parameter to measure the unidirectional radiation) of Case 1 ranges from 5-9.9 dB for frequencies 2.04-2.42 GHz, and the FBR of Case 2 ranges from 5-16 dB for frequencies 2.16-3.15 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-such as indoors communication, remote sensing, and wireless sensor systems-for signal receiving or transmitting.
authors.affiliation: Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China. penglin@guet.edu.cn.|Key Laboratory of Microwave and Optical Wave-Applied Technology, Guilin University of Electronic Technology, Guilin 541004, China. penglin@guet.edu.cn.
authors.forename: Lin
authors.initials: L
authors.lastname: Peng
authors.affiliation: Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China. mcgrady_guet@163.com.
authors.forename: Ji-Yang
authors.initials: JY
authors.lastname: Xie
authors.affiliation: Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China. 13978385982@163.com.
authors.forename: Kai
authors.initials: K
authors.lastname: Sun
authors.affiliation: Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China. jiang_x@guet.edu.cn.|Key Laboratory of Microwave and Optical Wave-Applied Technology, Guilin University of Electronic Technology, Guilin 541004, China. jiang_x@guet.edu.cn.
authors.forename: Xing
authors.initials: X
authors.lastname: Jiang
authors.affiliation: Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China. siminl@guet.edu.cn.
authors.forename: Si-Min
authors.initials: SM
authors.lastname: Li
keywords: broadband; low profile; resonance based reflector; unidirectional; wireless applications