双频超宽带微带天线的设计与仿真

摘要

提出了一种基于圆形缝隙结构的双频超宽带微带天线.通过在圆形缝隙内加载椭圆形贴片使得天线在获得双频超宽带特性的同时又保持了很小的物理尺寸.仿真结果表明,该天线的-10 dB阻抗带宽分别为2.1~4.0 GHz和5.2~8.8 GHz,天线的相对带宽分别达到了62.3%和51.4%,覆盖了无线局域网(WLAN)的2.45 GHz、5.20 GHz和5.80 GHz三个频段以及宽带互通微波接入(WiMAX)的2．50 GHz和5.25 GHz两个频段.在通带范围内,有良好的辐射特性,并且天线的尺寸为35 mm ×35 mm ×1 mm,便于集成在电路系统中.%A dual-band and ultra wide band( UWB) antenna based on circle-slot is proposed. Loaded with an oval paster, the antenna bears the characteristics of dual-band and a smallest possible physical size. The simulation shows that the -10 dB impedance bandwidths of the an-tenna are (2. 1~4. 0) GHz and (5. 2 ~8. 8) GHz respectively, and the relative bandwidths are 62. 3% and 51. 4% respectively. The antenna covers the bands of 2. 45 GHz,5. 20 GHz and 5. 80 GHz of WLAN and the bands of 2. 50 GHz and 5. 25 GHz of WiMAX. Within the pass-band, the antenna features good radiation properties. The size of antenna is 35 mm × 35 mm × 1 mm and is fit for being integrated into the electrical system.