一种带陷频带可重构超宽带天线的设计

An Ultra-Wide Band Antenna with Notch Band Reconfigurability

提出了一种新的超宽带(UWB)天线,其工作频率从3.1 GHz至10.6 GHz,频带宽度达7.5GH。该天线具备4.9 GHz至5.9 GHz频带的带陷功能,可实现超宽带带陷谱与超宽带非带陷谱间的重构。该天线采用具有双阶梯下切角的平板单极子结构,其接地面上刻蚀一U型槽。在槽线的中间位置,嵌入一可控PIN二级管。该结构的特点在于U型槽、PIN管、控制单元和UWB收发系统位于同一平面,克服了异面结构中PIN控制引线对天线性能的影响,简捷而精确。该天线的设计、分析和优化采用时域有限积分技术(TD-FIT),其数值结果与测试结果的一致性证明该天线具备超宽频带的同时,可实现对特定频带的良好的带陷与重构。

A new Ultra-Wide Band（UWB） antenna has been designed in the paper that is capable of band notching and spectrum reconfiguration.The antenna is able to cover from 3.1 GHz to 10.6 GHz,the bandwidth of which is up to 7.5 GHz.The proposed antenna has a feature of band notching from 4.9 GHz to 5.9 GHz,which make it possible to do band reconfiguration from the UWB spectrum with band-notch to the UWB spectrum with band-notch nothing,or vice versa.The antenna looks like a planar monopole with double notches at the bottom edges.On the ground plane,an U-shaped slot is etched and a PIN diode is embedded on the middle for switching ON and OFF.Since the U slot,the PIN diode,the control unit and the UWB transceiver are on the same plane,the design can remove off the influence from the PIN control line effectively.The design,analysis and optimization of the antenna is based on the numerical method of time-domain finite integral techniques（TD-FIT）,which,along with the experiment result,show the validation of the antenna with of sound capability of band notch and spectrum reconfiguration across the whole band of Ultra-Wide Band system.