A compact broadband antenna for ultra high frequency and L band on 5G new radio base stations. Issue 5 (31st January 2023)

• Record Type: Journal Article
• Authors: Cui, Yuehui; Tu, Zhenxing; Qin, Yue; Li, RongLin
• Is Part Of: IET microwaves, antennas & propagation. Volume 17:Issue 5(2023)
• Page Start: 361
• Page End: 368
• Publication Date: 2023-01-31
• Subjects: broadband antennas -- dipole antennas; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/mia2.12343
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract: A simple method is proposed for the realisation of compact dual‐polarised antennas. The aperture area of a dual‐polarised dipole antenna can be reduced by half by surrounding the antenna with a square loop. Based on the method, a broadband compact dual‐polarised antenna is developed. The broadband dual‐polarised antenna consists of two ±45°‐polarised dipoles surrounded by a square loop and fed by two orthogonal broadband baluns. A resonance at a sfrequency ( f Lr = 0.7 GHz) is created by the square loop, leading to a compact size of about λ Lr /4 × λ Lr /4, where λ Lr is the wavelength in free space at f Lr . Another resonance at a higher frequency ( f Hr = 1.5 GHz) is generated by etching open slots on the ±45°‐polarised dipoles. A combination of the lower‐frequency and the higher‐frequency resonances results in a broadband operation. Simulation and experimental results show that the compact dual‐polarised antenna achieves an impedance bandwidth of 75% (0.69–1.52 GHz) for return loss > 15 dB with stable radiation patterns, which is potential to be used for 5G new radio base‐station applications. Abstract : A simple method is proposed for reducing antenna aperture. Based on the method, a broadband compact dual‐polarised antennas is developed for 5G new radio base‐station applications, which has a broad bandwidth of 75%, smallest antenna size, and stable radiation performances.