Open AccessA single‐microstrip‐fed S‐shaped magneto‐electric dipole array with broadband circular polarisation for MMW applications
Author(s) -
Zhang Changhong,
Li Longye,
Zhang Rui,
Shao Yu,
Lin Feng
Publication year - 2021
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/mia2.12185
Subject(s) - microstrip , optics , broadband , extremely high frequency , physics , microstrip antenna , axial ratio , millimeter , bandwidth (computing) , dipole antenna , materials science , wavelength , impedance matching , dipole , radiation , optoelectronics , electrical impedance , antenna (radio) , circular polarization , telecommunications , engineering , quantum mechanics
In this study, a single‐microstrip‐fed S‐shaped magneto‐electric (ME) dipole array with broadband circular polarisation is presented for millimetre wave (MMW) applications. The ME dipole is composed of four S‐shaped patches and metalised via holes. The patches are sequentially fed by a single microstrip ring with four impedance matching sections underneath the patches through four via holes. The proposed antenna achieves a 32.7% impedance bandwidth (IBW), 25.7% axial‐ratio bandwidth (ARBW), maximum gain of 8 dBic and low profile of 0.1 λ 0 ( λ 0 is the free space wavelength referring to 28 GHz), which decreases to 40% of general ones with a profile of 0.25 λ 0 . To confirm the superiority of the antenna, a compact 2 × 8 array with the dimension of 7.8 λ 0 × 3 λ 0 × 0.1 λ 0 is fabricated on two substrate layers. Experimental results show that the IBW is 37% covering 22–32 GHz, ARBW for axial ratio (AR) smaller than 3.4 dB is 26.9% covering 22.5–29.5 GHz, maximum gain is 18.5 dBic, and aperture radiation efficiency (ARE) is better than 70%. In addition, the basic element with excellent performance is single‐microstrip‐fed and easily expandable to any size, which makes it a promising candidate that can be adopted in MMW bands.