Broadband Dual-Polarized Omnidirectional Antenna for 2G/3G/LTE/WiFi Applications

A broadband dual-polarized omnidirectional antenna is presented in this letter for the 2G/3G/LTE/WiFi communication systems. It consists of one vertically polarized (VP) element and one horizontally polarized (HP) element. The VP element is composed of a ground plane and a center-fed discone coupled by a circular patch with four shorting legs, while the HP element is composed of a printed dipole array, a feeding network, and four pairs of parasitical branches. Through such deliberate design, a broad bandwidth from 820 MHz to more than 6 GHz (about more than 152%) for VP and from 1530 to 2950 MHz (about 63%) for HP can be achieved while keeping the antenna compact. Good port isolation, omnidirectional patterns in horizontal plane, along with acceptable cross polarization and gain are also obtained. Details of the antenna design as well as experimental results are presented and discussed.