A Compact Dual-Polarized Patch Antenna With L-Shaped Short Pins

Abstract

A compact dual-polarized patch antenna with L-shaped short pins is proposed. The proposed antenna is configured with two substrates of 1.524 and 1.5 mm thickness, stacked by two prepregs of 2 × 95 µm thickness. The top layer is a rectangle patch with a T-shaped slot, two T-shaped branches, and two L-shaped short pins, which are shorted to the bottom layer of the metallic ground with the same size pins, and is fed by two vertical coaxial probes. In total, two L-shaped short pins achieve high isolation between the two ports by introducing three rectangular slots etched on the ground, two L-shaped strips in the middle layer connected with the short pins, and two T-shaped branches. Moreover, a wider bandwidth is realized by two L-shaped strips. A prototype of 0.16 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × 0.16 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × 0.04 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> has been fabricated, where λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> is the free-space wavelength at the center frequency. The measured isolation of better than 35 dB is obtained over the operating bandwidth of 3.46–3.58 GHz. The experimental results agree well with the simulation results, making it a competitive candidate for 5G applications in the indoor and terminal scene.