High-Isolation X-Polar Antenna

Antennas with dual linear slant polarization are necessary for modern personal communication base station applications. X-Polar antenna stands for an antenna with dual linear slant polarization. The most significant feature of the proposed antenna is high isolation between two different polarizations. The structure used here includes a reflector, a U-shaped strip, a cross-slot, a patch, and a director. Simulation and measurement results show minimum 30 dB isolation between the two polarizations. This structure yields half-power beamwidth (HPBW) of 65°, a cross-polarization level of less than -15 dB, and a voltage standing wave ratio (VSWR) of better than 1.5. This structure is useful for dual-band and dual-polarized applications such as the Global System for Mobile communications (GSM) and the Universal Mobile Telecommunications System (UMTS) frequency range.