Dual-Polarized Antenna With Suppression of Cross-Band Scattering in Multiband Array

A method to suppress cross frequency band scattering in multiband array (MBA) is proposed in this letter. Due to the short distance between the lower band (LB) elements and the higher band (HB) elements in MBA, the performances of the elements are distorted. By adding three L-shaped branches to each arm of LB element, the induced current can be effectively regulated, which greatly reduces the cross-band scattering ability of the array. Thus, the elements of each frequency band do not interfere with each other and work alone. This method is applied to the MBA with the interleaved scheme, which consists of one LB element with the operating frequency ranging from 0.73 to 0.86 GHz, and four HB elements with the operating frequency ranging from 1.79 to 2.41 GHz. Both simulation and measurement of proposed geometry show that this method is simple, effective, and easy to fabricate. The proposed geometry can be widely used in multiple wireless communication systems due to its high isolation, stable radiation patterns, and lower cross-band scattering.