而在FCC发布了1st R&O之后,对UWB信号的限制大为放宽,UWB信号的定义从分数带宽(fractional bandwidth)不小于0 25或者.10dB带宽不小于1 5GHz改为分数带宽不小于0 2或者一10dB带宽不小于500MHz。
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天线的总体Q值如下计算: Chu[1]及Wheeler [2] 从理论上给出了品质因数Q以及无损天线相对带宽 (fractional bandwidth)的上限。 式中,a 是包围天线球体的最小圆周半径。
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...于2.5GHz的超宽频系 统至少需要500MHz的频宽,中心频率在 2.5GHz以下的超宽频系统需要至少20%的 频宽比(fractional bandwidth)则称为 超宽频。 2.
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bandwidth fractional 部份频宽
In this article some results about the study of a SAW power series fm-dl (pfm-dl) with time-bandwidth product of 160 and fractional bandwidth of 32% are presented.
本文报道了对时带宽积为160,相对带宽为3%的幂级数调频SAW色散线的研究结果。
Two kinds of SAWF using respectively usual and SPUDT tapered transducers with 15% fractional bandwidth are designed on Y128. One transducer is block weighted, and the other one withdrawal - weighted.
我们在Y128基片上采用一般型和SPUDT型锥型换能器制作了相对带宽约15%的声表面波滤波器,一个换能器采用“块加权”,另一个换能器采用抽指加权。
The hexagon fractional slot structure is chosen, the gradually changed CPW feed is adopted. Not only the bandwidth of matched impedance is expanded, but also the antenna's miniaturization is realized.
选择正六边形分形缝隙结构,采用渐变的共面波导馈电,不仅拓宽了阻抗带宽,而且实现了天线的小型化。
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