(事实上,我大部分时间都在嘲笑男性和女性标准与同一模型相匹配的聪明才智,不,我不负责任)。
至于使用3D模拟,是的,这样做是实际和合理的。
事实上,我负责开发75欧姆连接器母头开放型号,用于新的4槽长指连接器(如果误插入50欧姆N型连接器,它可以存活)。
为了设置边界条件,我设置了两个模型:一个用于实现最大相移,这意味着最大电容,因此这是最小直径外导体,最大直径中心导体,手指最大扩展,手指最宽,最小插槽宽度。
所有这些都取自底层部件的物理尺寸限制。
对于最小相移,我选择了相反的尺寸,最短的线,最宽的槽等。这给出了相位与频率的范围。
我选择中点进行曲线拟合以获得多项式的Cn值,然后我计算了与中点的偏差,以计算设置源匹配规范的最大误差。
几个月后,生产航空公司以验证结果,偏差中点提供了对实际性能的良好估计。
这种技术最坏的情况;
一个人可以合理地使用最大/分钟的标准偏差估计进行相同的过程,以获得更具统计性的驱动值;
如果原始值被认为过大,则使用95%覆盖因子(K = 2.77)可能会产生较小的源匹配估计值。
以上来自于谷歌翻译
以下为原文
(In truth, I was mostly jesting about the cleverness of making male and female standards match the same model, and no, I wasn't responsible for that).
As to using 3D simulation, yes it is practical and reasonable to do this. In fact, I was responsible for developing the 75 ohm connector female open model, for a new 4-slot long-finger connector (it could survive if one mistakenly inserted a 50 ohm type N connector). To set the boundary conditions I setup two models:
One to acheive maximum phase shift, which means maximum capacitance, so this was smallest diamter outter conductor, largest diameter center conductor, maximum spread of the fingers, logest fingers, minimum slot width. All this was taken from the physical dimension limits of the underlying parts. For minimum phase shift, I chose the opposite dimensions, shortest lines, widest slots, etc.
This gave a range of phase vs frequency. I chose the mid point to do a curve fit to obtain the Cn values for the polynomial then I computed the deviation from the mid point to compute the maximum error from which the specifications for source match were set. Several months later, airlines were produced to verify the results and the deviation midpoint provided a good estimate of the actual performance.
This technique gives worst case; one might reasonably do the same process using an estimate of standard deviation insteate of max/min to obtain a more statiistically driven value; using a 95 percent coverage factor (K=2.77) might yield a smaller estimate for source match in that case if the original value was deemed execessively large.
(事实上,我大部分时间都在嘲笑男性和女性标准与同一模型相匹配的聪明才智,不,我不负责任)。
至于使用3D模拟,是的,这样做是实际和合理的。
事实上,我负责开发75欧姆连接器母头开放型号,用于新的4槽长指连接器(如果误插入50欧姆N型连接器,它可以存活)。
为了设置边界条件,我设置了两个模型:一个用于实现最大相移,这意味着最大电容,因此这是最小直径外导体,最大直径中心导体,手指最大扩展,手指最宽,最小插槽宽度。
所有这些都取自底层部件的物理尺寸限制。
对于最小相移,我选择了相反的尺寸,最短的线,最宽的槽等。这给出了相位与频率的范围。
我选择中点进行曲线拟合以获得多项式的Cn值,然后我计算了与中点的偏差,以计算设置源匹配规范的最大误差。
几个月后,生产航空公司以验证结果,偏差中点提供了对实际性能的良好估计。
这种技术最坏的情况;
一个人可以合理地使用最大/分钟的标准偏差估计进行相同的过程,以获得更具统计性的驱动值;
如果原始值被认为过大,则使用95%覆盖因子(K = 2.77)可能会产生较小的源匹配估计值。
以上来自于谷歌翻译
以下为原文
(In truth, I was mostly jesting about the cleverness of making male and female standards match the same model, and no, I wasn't responsible for that).
As to using 3D simulation, yes it is practical and reasonable to do this. In fact, I was responsible for developing the 75 ohm connector female open model, for a new 4-slot long-finger connector (it could survive if one mistakenly inserted a 50 ohm type N connector). To set the boundary conditions I setup two models:
One to acheive maximum phase shift, which means maximum capacitance, so this was smallest diamter outter conductor, largest diameter center conductor, maximum spread of the fingers, logest fingers, minimum slot width. All this was taken from the physical dimension limits of the underlying parts. For minimum phase shift, I chose the opposite dimensions, shortest lines, widest slots, etc.
This gave a range of phase vs frequency. I chose the mid point to do a curve fit to obtain the Cn values for the polynomial then I computed the deviation from the mid point to compute the maximum error from which the specifications for source match were set. Several months later, airlines were produced to verify the results and the deviation midpoint provided a good estimate of the actual performance.
This technique gives worst case; one might reasonably do the same process using an estimate of standard deviation insteate of max/min to obtain a more statiistically driven value; using a 95 percent coverage factor (K=2.77) might yield a smaller estimate for source match in that case if the original value was deemed execessively large.
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