基于三贴片的平面滤波贴片天线

Planar filtering patch antenna using three patches

文中提出了一种基于三贴片实现的平面滤波天线,其主要由加载矩形槽和接地孔的主贴片以及两块短路副贴片构成。短路副贴片、矩形槽以及接地孔的使用可使天线工作在反相TM20模(通带内)以及同相TM20模(高端辐射零点)。所提出天线的工作带宽可通过改变主、副贴片间的间距以及副同贴片的宽度进行调节,低端辐射零点可通过改变接地孔位置以及矩形槽的长度进行调控。为验证理论预期的可实现性,设计了一个工作在1.84 GHz的案例,其1 dB带宽为52 MHz,增益为6.65 dBi,两辐射零点各出现在1.5 GHz、1.88 GHz,提高了天线的带外抑制特性。

A planar filtering patch antenna with enhanced bandwidth,gain and frequency selectivity is proposed.The antenna is composed of a slotted square patch and two parasitic shorted patches,and the slotted square patch is with three vias and fed by a coaxial probe.The existence of the parasitic patches,vias and slots supports the operation modes of the anti-phase TM20(passband)and in-phase TM20(upper radiation null).The bandwidth can be controlled by changing the distance between the mian patch and parasitic shorted patches,and the width of the parasitic patches,while the lower radiation null can be controlled by the location of the shorted vias and the distance of the slots.An antenna design is exemplified at 1.84 GHz with measured 1 dB bandwidth of 52 MHz,the gain of 6.65 dBi and two radiation nulls respectively at 1.5 GHz and 1.88 GHz.The appearance of two radiation nulls improves the performance of the out-of-band suppression.