功率容量

了解SMA头功率容量看这一张图就够了

  您对于sma头功率容量知道多少,如果您想了解sma头的功率容量想相关知识,看完这篇稿子就应该差不多了。德索博客频道,每周有工程师固定更新一些专业文章,感兴趣的话可前往查阅,地址:。

  同轴电缆/接头功率处理是一个复杂的课题,但它可以分解成两种现象。高峰值功率会导致电弧引起的故障,而高平均功率会导致由于热导致的故障。

  射频接头的功率承受与尺寸和材料有关,一般不能直接计算。同一种接头,使用材料不同,功率承受也不一样。

  一般来说,接头的功率承受随信号频率变高而降低。对同一频率的射频信号,尺寸大的接头的功率承受大。比如一般的SMA接头,在2GHz的功率承受约为500W,在18GHz下的功率承受不到100W。BMA和SMA差不多,N接头的功率承受约为SMA的3-4倍。以上所述功率承受指连续波功率。如入射功率为脉冲则功率承受还要高些。注意如果传输过程的匹配不好,驻波过大,则接头上承受的功率有可能大于入射功率。一般为安全起见,在接头上加载的功率不应超过其极限功率的1/2。

  This section was greatly improved for August 2017.

  Power handling of air coax is a topic that is related to atmospheric breakdown.

  Now, lets recall a shortcut equation for coax impedance the 60 in the equation is a close approximation of η0 (the impedance of free space, ~377 ohms) divided by pi. The equation is accurate to at least three decimal places.

  The peak power you can put into a coax under well-matched conditions (low VSWR) is calculated from the peak voltage it can withstand:

  Plugging the Z0 equation into the Pmax equation yields:

  Now that we have the final equation for maximum peak power handling of coax, we are ready to do some analysis. Remember that this result is only true for a matched load. If you accidentally broke a connection to a high-power transmitter, youd see a very high VSWR, in that case the peak voltage could double. If you need to consider this type of mishap, you want to further de-rate your power handling by 6 dB.

  Now lets look at some coax examples how about the air dielectric 50-ohm connectors? The breakdown strength of air 3,300,000 volts/meter according to Wikipedia, but that is at dry air at standard temperature and pressure, between spherical electrodes. Lets use 1,000,000 volts/meter.

  Before we move on to average power handling of coax, lets look at power handing as a function of line impedance for air coax, which is part of the coax compromise that led to the fifty ohm standard. If you allow the center diameter freedom to move away from 50 ohms, youll see that maximum peak power handling occurs at ~30 ohms.

  New for August 2017: additional thoughts on this. Peak power handling of air coax may not be at 30 ohms, if you consider another limitation. Suppose you are operating very close to the cut-off of the unwanted TE11 mode. Heck, lets assume you want to operate exactly at TE11 cut-off. TE11 cuts off when (b+a)*pi is equal to operating wavelength. To cut to the punch line, at TE11 cut-off, 44 ohms carries the most power. You can find this fun fact and many more in Introduction to Microwaves by Gershon J. Wheeler, dating back to 1963.

  For September 2017, we created a new page and posted the math behind the 44 ohm absolute maximum peak power handling calculation, it included two solutions: one is brute force, the other is elegant. At least they agree!

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