A Wideband Circularly Polarized Antenna with a Multiple-Circular-Sector Dielectric Resonator.
This paper presents the design of a wideband circularly polarized antenna using a multiple-circular-sector dielectric resonator (DR). The DR is composed of twelve circular-sector DRs with identical central angles of 30 ∘ but with different radii. A genetic algorithm is utilized to optimize the radii of the twelve circular-sector DRs to realize wideband circular polarization. The proposed antenna is excited using an aperture-coupled feeding technique through a narrow rectangular slot etched onto the ground plane. An antenna prototype is experimentally verified. The measured -10 dB reflection and 3 dB axial ratio (AR) bandwidths are 31.39% (1.88-2.58 GHz) and 19.30% (2.06-2.50 GHz), respectively, covering the operating bands of the following systems: UMTS-2100 (2.145 GHz), WiMAX (2.3 GHz), and Wi-Fi (2.445 GHz). A measured peak gain of 7.65 dBic at 2.225 GHz and gain variation of less than 2.70 dBic within the measured 3 dB AR bandwidth are achieved. In addition, the radiation patterns of the proposed antenna are presented and discussed.
School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea. jsonbkhn@gmail.com.
Son
S
Trinh-Van
School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea. yang09@skku.edu.
Youngoo
Y
Yang
School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea. klee@skku.edu.
Kang-Yoon
KY
Lee
School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 440-746, Korea. khwang@skku.edu.
Keum Cheol
KC
Hwang
aperture-coupled feeding; circular polarization; dielectric resonator antenna; multiple-circular-sector structure; wide bandwidth