摘要
本文提出了一种基于mushroom结构的新型双频双模微带天线。天线由两层构成:上层为mushroom结构辐射贴片层;下层采用微带缝隙耦合馈电。天线具有两种工作模式:低频点为近似腔体慢波辐射模式,具有最大辐射方向为平面两侧的端射远场方向图;高频点为传统的贴片辐射模式,具有最大辐射方向为垂直贴片平面的边射远场方向图。天线模型的场分布、近场反射系数和远场方向图验证了天线的工作机理。天线具有良好的阻抗匹配、交叉极化特性,在无线通信系统中具有潜在的应用价值。
Microstrip patch antenna with dual-band and dual-mode based on mushroom structure is presented in this paper. The antenna consists of two layers: the up layer is the mushroom structure and the down layer is the microstrip line-slot coupling feeding structure. The antenna operates at two modes: the bidirectional mode with endfire radiation patterns and the directional mode with edge radiation patterns. The field distribution, reflection coefficient and far field radiation patterns are given for confirming the working principle of the antenna. With good impedance matching and high cross-polarization level, this antenna owns potential application value in wireless communication systems.
引文
1 James,J.R.,and P.S.Hall(Eds),Handbook of Microstrip Antenna.,Vol.1,Peter Peregrinus,London,UK,1989.
2 Pozar,D.M.,and S.M.Duffy,A dual-band circularly polarized aperture-coupled stacked microstrip antenna for global positioning satellite[J].IEEE Trans.Antenna and Propagation,Vol.AP-45,1997,pp.1618-1624.
3 Waterhouse R.B.,Targonski S.D.,and Kokotoff D.M.Design and performance of small printed antennas[J].IEEE Trans.on Antennas and Prop.,vol.46,no.11,pp.1629-1633,Nov.2003.
4 Nunes R,Moleiro A,Rosa J,et al,Dual-band microstrip patch antenna element with shorting pins for GSM[J].IEEE Antennas and Propagation Society Int.Symp.,vol.2,pp.16-21,Jul.2000.
5 Caloz C and Itoh T,Electromagnetic Metamaterials:Transmission Line Theory and Microwave Applications.Hoboken-Piscataway:Wiley-IEEE Press,2005.
6 Sievenpiper D,Zhang L,Broas R F J,et al.High-impedance electromagnetic surfaces with a forbidden frequency[J].IEEE Trans.Microw.Theory Tech.,vol.47,no.11,pp.2059–2074,Nov.1999.
7 Yang F R,Ma K P,Qian Y,and Itoh T.A uniplanar compact photonic-bandgap(UC-PBG)structure and its applications for microwave circuit[J].IEEE Trans.Microw.Theory Tech.,vol.47,no.8,pp.1509–1514,Aug.1999.
8 Liang J.and Yang H.Y.D.Radiation characteristics of microstrip patch over on electromagnetic bandgap surface[J].IEEE Trans.Antennas Propagat.,vol.55,no.6,pp.1691–1697,June.2007.
9 Wenquan Cao,Bangning Zhang,Aijun Liu,Multi-frequency and dual-mode patch antenna based on electromagnetic band-gap(EBG)structure,IEEE transactions on antennas and propagation,vol.60,no.12,pp.6007-6012,December.2012.