An Endfire Circularly Polarized Complementary Antenna Array for 5G Applications

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Original languageEnglish
Article number8805254
Pages (from-to)266-274
Journal / PublicationIEEE Transactions on Antennas and Propagation
Issue number1
Online published19 Aug 2019
Publication statusPublished - Jan 2020


An endfire circularly polarized (CP) complementary antenna array is proposed for 5G applications. The proposed antenna is realized using a single-layered printed circuit board (PCB) with plated-through-hole technology and metal blocks. The antenna element consists of an open-ended substrate-integrated waveguide (SIW), an electric dipole, a double-sided parallel-strip line (DSPSL), and two metal blocks. It is simple in configuration and can achieve wide impedance and axial ratio (AR) bandwidths, stable gain and radiation patterns, and low back radiation. To increase the gain, a 1 × 8 antenna array is formed by integrating eight antenna elements with a planar 1-8 SIW feed network. The measurement results show that the proposed array can achieve an overlapping impedance and AR bandwidth of 23.8% from 56.3 to 71.5 GHz with an endfire left-handed CP (LHCP) gain from 14 to 15.3 dBic. The proposed array possesses all the salient features of the complementary source in symmetric and stable radiation patterns, low back radiation, and wide bandwidth.

Research Area(s)

  • Circularly polarized (CP), complementary source, endfire, fifth generation (5G), millimeter wave (mm-wave), substrate integrated waveguide (SIW)