我想测量| S11 |
用于业余无线电的一些喇叭天线，用于HP 8720D上的10.368 GHz，以及| S21 |
计算两个相同天线的增益。
VNA具有选项1D5和010，因此只有3个接收器，因此无法进行真正的TRL校准。
鉴于这只是出于业余目的，购买波导校准套件不是一种选择，所以我打算自己做。
根据我的阅读（安捷伦应用笔记和乔尔的书），这看起来并不是波导中的火箭科学。
我的自制校准套件将包括几个精确的WR90负载，一个9.7毫米厚的四分之一波长垫片和一个短路。
我可能会添加安捷伦校准套件中包含的“标准部分”。
短路和垫片都是有序的，所以我没有它们，也不能进行wavguide校准。
我的问题是检查校准套件 - 我怎么知道它是否有效？
如果我进行单端口校准而不是波导短路，我假设我会看到所有频率的短路。
但是，如果我添加一个5毫米的垫片，并应用5毫米的端口延伸怎么办？
VNA是否会考虑波导中的色散？
它会在所有频率上显示短路吗？
我的直觉是端口扩展可能对波导器件无用，但我错了吗？
戴夫，G8WRB
以上来自于谷歌翻译
以下为原文
I want to measure |S11| of some horn antennas for amateur radio use at 10.368 GHz on an HP 8720D, as well as |S21| to compute the gain of two iden
tical antennas. The VNA has option 1D5 and 010, so has only 3 receivers and so can't do true TRL calibration.
Given this is just for amateur purposes, buying a waveguide calibration kit is not an option, so I intend making my own. From what I have read (Agilent application notes and Joel's book), this does not look to be rocket science in waveguide .
My home-made cal kit is going to consist of a couple of precision WR90 loads, a 9.7 mm thick quarter wave shim and a short. I might add the "standard section" as included in Agilent cal kits. The short and shim are on order, so I don't have them and cant do a wavguide calibration.
My issue comes with checking the cal kit - how do I know if it works or not?
If I do a one-port calibration than with a waveguide short, I assume I will see a short at all frequencies. But what if I add a spacer of say 5 mm, and apply a port extension of 5 mm? Would the VNA take into account the dispersion in the waveguide or not? Would it show a short at all frequencies?
My gut feeling is the port extensions might be useless for waveguide devices, but am I wrong?
Dave, G8WRB
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