混合波导/同轴电缆校准混淆

我们试图在双向耦合器上进行四端口校准，其中我们的DUT在直通端口上是波导到波导，并且在耦合端口处同轴。
我们在连接到PNA-X端口1和2的每个波导端口处都有一个同轴到波导适配器。当我们测量我们的DUT时，它们将保持开启状态。
端口3和4具有正常的同轴测试电缆，稍后将连接到耦合的DUT端口。
我们选择智能卡，并选择4端口。
PNA-X设置为我们的波导类型的端口1和2以及相应的TRL校准套件，以及选择ECAL的同轴连接器类型的端口3和4。
我们检查下一步修改cal。
我们得到附件中显示的对话框，重复此问题。
对于某些波导校准套件，它默认为适配器移除，而不是默认为Unknown thru。
因此，第一个问题是，什么决定了默认选择的内容，以及我们选择的内容是否重要。
显然，未知的通过更简单，所以我们宁愿这样做。
关于这个对话的另一个问题是，未知的是什么？
波导适配器的同轴电缆是否被认为是未知的，因为我们必须使同轴电缆适应波导？
这将连接到端口1或2的适配器连接到端口3或4的新适配器。对此的答案可能与下一段相关。
当我们开始做实际的cals时，波导到波导TRL cal是显而易见的，并且同轴Ecax cal的同轴电缆是显而易见的。
然后我们来到Waveguide来调用cal的一部分，一个用于端口3，一个用于端口4.附件中的第二个对话框显示端口1 /适配器/端口3.这是波导适配器的同轴电缆，所以完整
路径将是：PNA-X端口1 - >同轴测试电缆 - >永久连接同轴到波导适配器 - >临时同轴到波导 - >同轴测试电缆 - > PNA-X端口3.这种理解和方法是否正确？
谢谢。



     以下为原文

  We are trying to do a four port cal on a dual directional coupler, where our DUT is waveguide to waveguide on the thru ports, and coax at the coupled ports. We have a coax to waveguide adapter at each waveguide port connected to the PNA-X ports 1 and 2. These will be left on when we measure our DUT.  Ports 3 and 4 have normal coax test cables that will later connect to the coupled DUT ports.

We choose the smart cal, and select 4-ports. The PNA-X is set up for ports 1 and 2 to our waveguide type and the appropriate TRL cal kit, and ports 3 and 4 to the coax connector type, with the ECAL chosen. We check Modify cal, the next. We get the dialog box shown in the attached file, which repeats this question. For some waveguide cal kits, instead of defaulting to Unknown thru, it defaults to Adapter Removal. So the first question is, what determines what the default selection is, and does it matter what we select. Obviously, unknown thru is much simpler, so we would rather do that.  
  
The other question about this dialog is, what is the unknown thru? Is the coax to waveguide adapter considered the unknown thru since we have to adapt the coax to the waveguide anyways? This will put the adapter connected to port 1 or 2 connected to our new adapter for port 3  or 4. The answer to this might relate to the next paragraph.

When we start to do the actual cals, the waveguide to waveguide TRL cal is obvious, and the coax to coax Ecal cal is obvious. Then we come to the Waveguide to coax portion of the cal, one for port 3 and one for port 4. The second dialog in the attached file shows port 1/adapter/port 3. Is this the coax to waveguide adapter, so the complete path would be:  

PNA-X port 1 ->coax test cable-> permanently connected coax to waveguide adapter -> temporary coax to waveguide -> coax test cable ->PNA-X port 3.
  
Is this understanding and method correct?

Thanks.   
附件

• Mixed waveguide Cal question.docx61.1 KB