Study Of Miniaturized Broadband ±45° Dual-polarized Base Station Antenna

In recent years,the application of wireless communication systems has become more and more widespread,and more and more scholars and experts have devoted themselves to the research of wireless communication.As an important device in wireless communication technology,base station antennas have attracted the attention of many scholars and operators.The latest research directions of base station antennas mainly include:miniaturization,broadbandandanti-interferencecapability.By miniaturization,the cost of antenna can be reduced,by adopting broadband antenna,the channel capacity of system can be improved and adopting the antenna with anti-interference capability can prevent the interference of some narrowband system signals.In this paper,a broadband dual-polarized base station antenna,a miniaturized dual-polarized base station antenna and a broadband dual-polarized base station antenna with anti-interference capability are designed and studied.Details are as follows:1)A broadband±45°dual-polarization base station antenna for 2G,3G,4G(LTE)is proposed.Two perpendicularly crossed dipoles are excited by two microstrip stubs which are directly fed by two coaxial lines,which makes the dual-polarized antenna is full planar.Three rectangular slots and one V-shaped slot are embedded on each patch which effectively widen the impedance bandwidth and improve the gain of the designed antenna.2)A miniaturized±45°dual-polarized antenna is proposed.By using two streamlined shape dipoles,the size of the dual polarized antenna is reduced.A reflector with four reflective walls is used.By optimizing the size of the reflector,the size of the designed antenna is reduced to only105×105×35mm~3.The size of the designed antenna is much smaller than the size of the base station antennas working in the same frequency band.Finally,a 4-element dual-polarized planar antenna array is developed to improve the gain of the antenna.The antenna has the advantages of simple structure and good performance.3)A±45°dual-polarization base station antenna with notch characteristics is proposed.On the basis of design 2),two folded metal strips are added to the outer edge of each dipole to achieve notch characteristics.By changing the position and the length of the four metal strips,the antenna gets a notch of 2.35-2.57GHz,which improves the anti-interference of the antenna for the WLAN frequency band.