Resonant Length Formulations for Dual Band Slot Cut Equilateral Triangular Microstrip Antennas

The dual band equilateral triangular microstrip antennas are realized by cutting the slots of either quarter wave or half wave in length, inside the patch. In this design, however these simpler approximations of slot length against the frequency do not give closer results for different slot lengths and there positions inside the patch. In this paper, the modal variations of slot cut patch antennas over wide frequency range are studied. It is observed that the slot does not introduce any mode but reduces the higher order mode resonance frequency of the patch and along with the fundamental mode realizes dual band response. The formulations of the resonant length for the mode introduce by the slots in these antennas are proposed. The resonance frequencies calculated using proposed formulations agree well with the simulated results with an error of less than 5%.

正五边形同轴开槽线分析

应用保角变换和雅可比椭圆变换的方法 ,将正五边形同轴开槽线变换为对称平板波导 ,得到了其特性阻抗和分布电容的初等函数表达式 .特性阻抗Z0 =188.43 3k′(λ)δrk(λ) ,分布电容C =2εK(λ) /K′(λ) .其中 ,K(λ)和K′(λ)分别为以λ和λ′为模的第一类椭圆积分 ;

一种新型三角形宽带微带缝隙天线的设计

提出了一种新型的宽带微带天线,其结构由正三角形馈电微带贴片与正三角形宽槽贴片组成。正三角形宽槽开在金属GND板上,而正三角形贴片则置于介质板的另一面并位于三角形宽槽孔的偏下方。通过调节宽槽与贴片的相对位置实现了小尺寸下的宽带性能。设计天线大小为边长50 mm的正三角形,厚度为1 mm。采用HFSS仿真软件分析了该天线的阻抗带宽以及辐射方向图,结果显示该天线的S11参数小于-10 dB的带宽为2.3 GHz～4.3 GHz,有很好的应用前景。