具有双陷波特性的超宽带天线设计
Design of ultra-wideband antenna with dual band-notched function
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摘要: 设计了一款基于共面波导馈电的小型化具有双陷波特性的超宽带天线，该天线的带宽在3～14 GHz内，电压驻波比(VSWR)小于2。在辐射贴片上通过开L型和半圆环缝隙实现了在3.3～3.7 GHz和5.150～5.825 GHz的双频段的陷波特性，抑制了802.16无线城域网和无线局域网对超宽带系统的干扰，在整个工作频段具有稳定的增益和良好的全向性。通过对天线模型进行加工制作并测量，测试结果表明：天线的带宽是3～14 GHz，在3.3～3.7 GHz和5.15～5.825 GHz频段内VSWR大于4，实现了天线的双陷波特性。该天线尺寸小、结构紧凑的特点，适合现代的无线通信系统。Abstract: The paper presents a compact ultra-wideband coplanar-waveguide-fed monopole antenna with dual band-notched function. Two types of simple slots, L-shaped and semicircular, are cut in the radiating patch to realize the dual band-notched function in the frequency ranges of3.3 to 3.7 GHz for world interoperability for microwave access(WiMAX) applications and 5.150 to 5.825 GHz for wireless local area network(WLAN) applications. Experimental results show that the voltage standing wave ratio (VSWR) in the working band of 3 to 14 GHz is less than 2 except in the two band notches (VSWR more than 4). The proposed antenna has an almost omnidirectional radiation pattern and a good stable gain over the whole working band except the two band notches. The antenna has a small size and can be easily processed, which can greatly simplify the circuit design of a communication system.
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