A Wideband High-Gain Cavity-Backed Low-Profile Dipole Antenna

• Published in: IEEE transactions on antennas and propagation Vol. 64; no. 12; pp. 5465 - 5469
• Main Authors: Li, Jian-Ying, Xu, Rui, Zhang, Xuan, Zhou, Shi-Gang, Yang, Guang-Wei
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.12.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna radiation patterns; Bandwidths; Broadband; Broadband antenna; Broadband antennas; Dipole antennas; Dipoles; High gain; higher antenna gain; low-profile; Microstrip antennas; Wideband
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2016.2620607

In this communication, a compact, wideband, low-profile, and high gain dipole antenna is proposed. A microstrip coupling line is used to feed the ellipse pairs, which is two arms of the antenna. This simple feeding structure can significantly enhance the impedance bandwidth (IBW). A cavity-backed structure is adopted to achieve the low-profile antenna. With the influence of the cavity-backed structure, the new antenna has a higher gain over the whole frequency band. An optimized antenna with a height of only 0.17λ (where λ is the free space wavelength at the lowest frequency) is designed and measured. The measured result shows that the IBW for VSWR <; 2 is 117% (2.48-9.51 GHz). Further, the gain bandwidth (Gain > 6 dBi) from 2.57 to 8.73 GHz is more than 108.9%. The antenna radiation pattern performs well over the whole band, and the peak gain can reach 11.8 dBi.