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提出一种具有双陷波特性的燕尾形平面超宽带天线。天线的辐射体和地板分别采用椭圆和梯形的渐变结构,具有良好的宽带阻抗匹配特性。通过在辐射体上嵌入两种不同类型的缝隙,使天线具有双陷波功能。计算和实测结果表明,天线在通带(2～3.2GHz、4.3～5.3GHz和6.2～14GHz)频段范围内满足电压驻波比小于2,在3.2～4.3GHz和5.3～6.2GHz两个频段内同时具有陷波特性,并且,天线在通带频段内呈现良好的辐射特性。文末结合天线的实测阻抗曲线给出了一个概念性电路,定性地解释了陷波特性的工作原理。
A dovetail planar UWB antenna with double-notch characteristics is proposed. The radiator and the floor of the antenna respectively adopt an elliptical and a trapezoidal gradient structure, and have good broadband impedance matching characteristics. By embedding two different types of slots in the radiator, the antenna has a double notch function. The calculated and measured results show that the antenna can meet the VSWR of less than 2 in the pass band (2 ~ 3.2GHz, 4.3 ~ 5.3GHz and 6.2 ~ 14GHz), and in the two bands of 3.2 ~ 4.3GHz and 5.3 ~ 6.2GHz At the same time, it has notch characteristics, and the antenna shows good radiation characteristics in the pass band. In the end, a conceptual circuit is given based on the measured impedance curve of the antenna, which qualitatively explains the working principle of the notch characteristics.