一种基于圆环缝隙结构的双频宽带天线

提出了一种基于圆环缝隙结构的双频宽带天线，内外环缝间对称分布的四个矩形切口确保能量由外到内传递，内圆环中H形缝隙的引入使低频段带宽提高了1倍。仿真结果显示，该天线的-10dB阻抗带宽分别为1.80～3.29GHz和4.83～6.82GHz，天线的相对带宽分别达到了58.5%和34.2%，覆盖了无线局域网（WLAN）的所有三个频段和宽带互通微波接入（WiMAX）的2.5GHz和5.25GHz两个频段。

A Dual-band Broadband Antenna Based on Ring Slot Structure

A dual-band broadband antenna based on ring slot structure is presented.Four notches are placed between the ring slots to guarantee that the energy flows into the inner ring slot.Through adding H-shaped slot can double the antenna bandwidth at lower frequency.The simulated results demonstrate that the-10 dB impedance bandwidths of the antenna are(1.80~3.29)GHz and(4.83~6.82)GHz,and the relative bandwidths are 58.5% and 34.2%,espectively,which can meet the requirement of WLAN and WiMAX(2.5 GHz and 5.25 GHz bands).