Broadband Dual-Polarized Dielectric Patch Antenna With High Isolation for Full-Duplex Communication

A broadband dual-polarized dielectric patch (DP) antenna is investigated for the in-band full-duplex applications. Taking full advantage of the multimode feature of DP, four resonant modes are excited and adjusted to form the two wide operating bands with orthogonal polarization. Among them, the dominant TM
₁₀
mode and the high-order TE
₁₂
mode provide the
x
-polarization while the TM
₁₁
mode and the antiphase TM
₀₂
mode provide the
y
-polarization. In addition, the differential-fed scheme is applied to excite the
y
-polarization modes for high isolation. Thanks to the features of low loss and low profile of DP, the proposed antenna obtains advantages in terms of radiation efficiency and profile height. An antenna prototype is fabricated and measured. The experimental results illustrate that the measured isolation during the whole band is better than 48 dB with a low profile of 0.05
λ
_min
. The −10 dB bandwidths of two polarizations are 29.5% (4.71–6.1 GHz) and 18.9% (4.81–5.72 GHz), respectively.