Compact Dual-Polarized Fabry-Perot Leaky-Wave Antenna for Full-Duplex Broadband Applications

A Fabry-Perot leaky-wave antenna (LWA) with dual-differential feeding is proposed for full-duplex (FD) scenarios by offering dual-linearly polarized radiation. The compact feed system includes slots within substrate integrated waveguide (SIW) technology to excite two orthogonal fields with high isolation. The 2-D LWA aperture field is constituted by a top partially reflective surface (PRS) or screen, and is realized by a superstrate PCB. Dispersive results for the proposed structure are also reported, suggesting that broadside radiation is possible from about 22 GHz. The fabricated antenna is also well matched from 22 GHz to about 25 GHz with isolation values greater than 40 dB. The
$3-$
dB fractional bandwidth for broadside radiation is 10.5%, from about 22.5 GHz to 25 GHz. As compared to other FD antenna systems, the developed configuration is compact, provides dual-linear (orthogonal) polarization, also offering higher isolation levels, low cross-polarization (about
$-$
40 dB), and high gain (16 dBi), whilst employing simple feeding. As further described in the paper, the prototyped dual-polarized LWA can be useful in 5 G and 6 G systems where FD is required.