基于CSRR的三陷波单极子超宽带天线的设计

Abstract

本文提出了一种基于互补环缝谐振器CSRR(Complementary Split-Ring Resonator)的三陷波单极子超宽带天线。天线采用50 Ω微带馈电，通过在单极子贴片单元上加载一个CSRR结构，实现了WiMAX频段(3.3~3.6 GHz)和卫星通信C波段(3.7~4.2 GHz)的双陷波。在地板上引入一对对称的CSRR结构，实现了WLAN频段(5.15~5.825 GHz)的陷波。改变CSRR的结构参数，分析了其对天线S11参数、电压驻波比(VSWR)及辐射特性的影响。在驻波比(VSWR)小于2的情况下带宽达到了2.7~8.5 GHz，符合超宽带天线的要求。 This paper puts forward a new kind of monopole UWB (Ultra wideband) antenna based on the CSRR (Complementary Split-Ring Resonator) with triple band-notched characteristics. Antenna is fed by a 50 Ω microstrip line. With a CSRR structure on the monopole patch unit, dual-band filtering properties in the WiMAX (3.3 - 3.6 GHz) and C-band (3.7 - 4.2 GHz) for satellite communication systems are achieved. Using a symmetrical CSRR structure loading on the ground, WLAN (5.15 - 5.825 GHz) band-notched characteristics is obtained. Changing the parameters of the CSRR structure, the effects of S11 parameters, voltage standing wave ratio (VSWR) and radiation characteristics are analyzed. The designed antenna has an impedance bandwidth of 2.7-8.5 GHz for VSWR less than 2.