摘要
研究了共面紧凑型光子晶体(UC-PBG)结构的带隙特性,并采用UC-PBG结构来抑制背面金属支撑共面波导(CB-CPW)中的平行板模式。提出了一种新型的基于UC-PBG结构的CB-CPW馈电贴片天线,通过将CB-CPW背面的金属地板改造成二维UC-PBG栅格结构,在保持CB-CPW原有优点的同时,成功地抑制了平行板模式在天线中的传播。仿真与测量结果表明,与传统的CB-CPW馈电贴片天线相比,该新型天线在UC-PBG的带隙范围内抑制了平行板模式造成的能量泄露,消除了其带来的寄生谐振效应和多径干扰效应,天线的方向图更加光滑对称,旁瓣大大减小,同时法向增益提高了1.5 dB。
This paper focuses on the usefulness of a uniplanar compact photnic bandgap （UC-PBG） structure in suppression of the parallel- plate- mode generated by the conductor- backed coplanar waveguide（CB-CPW）. Herein a new CB- CPW fed patch antenna with a UC- PBG structure is presented, whose construction is baesd on the periodic lattices of the designed UC- PBG structure which replaces the back ground plane of the ordinary CB- CPW. This antenna not only has the merits of traditional CB- CPW but also obtains another strongpoint which is indicated by suppressing the propagation of the parallel plate waveguide modes. Numerical and experimental investigations show that the proposed antenna can obtain a good radiation when operating within the UC- PBG band- gap through effectively preventing the leakage of electromagnetic fields into the substrate. It is also shown that the placement of UC- PBG structure renders elimination of spurious resonances and multipath interference produced by the parallel plate waveguide modes, and results present that the radiation pattern is more symmetry and smoother than that of traditional CB -CPW fed patch antenna, with less wasted power in the sidelobe and 1.5 dB higher gain in the forward direction.
出处
《电讯技术》
北大核心
2009年第8期89-93,共5页
Telecommunication Engineering
