Wideband Dual‐Polarised Tapered Slot Antenna With Compact Structure for Full‐Duplex Applications

ABSTRACT

A compact, wideband dual‐polarised antenna with high isolation is presented for in‐band full‐duplex applications. In order to achieve high isolation, an orthogonal tapered slot antenna (TSA) with symmetric configuration is designed and investigated to realize the proposed aperture‐level coupling cancelation (ALCC) concept. An asymmetric top‐loading patch is employed to lower the TSA's profile, resulting in a more compact structure and improved impedance matching. The proposed design with electrical dimensions of Φ 0.49λ _min  × 0.29λ _min (λ _min is the free‐space wavelength at the lowest operational frequency) is fabricated, measured and analysed. The measurement results reveal that the proposed antenna exhibits a 10 dB return loss bandwidth of 73.5% (2.52–5.45 GHz), an isolation of ≥ 45.6 dB over the bandwidth from 3.4 to 5.45 GHz (46.3%) and peak isolation of 70.3 dB at 4.7 GHz.