共面波导馈电小型平面超宽带天线的设计与研究

Design and Study of Coplanar Waveguide(CPW)-Fed Compact Planar Ultra-Wideband(UWB) Antenna

首先提出了一种新结构共面波导馈电的小型平面超宽带(UWB)天线,该天线类似一般的共面波导馈电宽缝隙天线,为了获得超宽带工作特性,设计方案中采用了叉状结构的调谐支节,并将其辐射缝隙设计为多边形;通过数值计算研究了某些尺寸参数对天线输入特性的影响,在计算的基础上通过大量的实验详细研究了天线的频域工作特性,然后对其时域瞬时脉冲信号保真度特性进行了数值分析。计算与实验的结果表明,该天线具有超过3.2∶1的工作带宽和全向辐射特性,而且具有较好的线性相位传输特性和脉冲信号保真度,是一种有实用意义的超宽带天线。

In this paper, a novel compact coplanar waveguide （ CPW）- fed antenna is proposed. The antenna is similar in configuration to a conventional CPW-fed wide slot antenna, but it consists of a fork-like tuning stub and a polygon-like slot in order to achieve ultra-wideband characteristic. It has been studied in detailed for its performance in frequency-domain numerically and experimentally, and it has also been studied for its transient pulse signal fidelity in time-domain numerically. It＇ s shown that an operation bandwidth of over 3.2：1 and good omnidirectional radiation patterns can be achieved. Furthermore, good linear phase characteristic and impulse signal fidelity can also be achieved. Thus it is a promised candidate antenna for ultra-wideband （UWB） communication system.