一种具有陷波特性的多模态频率可重构UWB天线

为了应对在超宽带(Ultra-Wide Band, UWB)系统中频率可重构天线尺寸偏大、模式单一等问题，提出了一种具有陷波特性的多模态频率可重构UWB天线。该天线通过在圆形单极子的辐射贴片上添加T型枝节和刻蚀I型槽、倒U型槽，以获得UWB覆盖范围为2.7～11.6 GHz的宽阻抗带宽，并产生四个陷波带。仿真与实测表明：控制PIN二极管的偏置状态，可以实现单频段、双频段、三频段、四频段和五频段共五种频段下八种工作模式的多模态切换。此天线大小为16 mm×19 mm,较传统单极子天线体积减小了40%以上，实现了小型化。天线的最大增益为4.13 dBi,具有良好的辐射特性。

A Multimodal Frequency Reconfigurable UWB Antenna with Trap Characteristics

In order to deal with issues of over-sizing and single mode of frequency reconfigurable antenna in the system of ultra-wide band (UWB), a reconfigurable as well as multi-modal frequency UWB antenna with band-notched features is presented in this article. By adding T-shaped knots, etched I-shaped groove, and inverted U-shaped groove into radiation patch of circular mono-pole, the antenna can get wide impedance bandwidth of UWB ranging from 2.7 GHz to 11.6 GHz. And then four kinds of trap bandwidth will come into being. It has been shown by simulation and practical data that: the control of offset starts in PIN diode can make it possible to switch under eight multimoding conditions among five frequency bands including single-band, dual-band, tri-band, four-band and five-band. The size of antenna mentioned above is 16 mm×19 mm with a reduction of over 40% in volume comparing to the mono-pole, thus realizing the miniaturization. The maximum gain of antenna is 4.13 dBi with better radiation characteristics.