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我有一块 PCB 板，想测试其上带状线的插入损耗。该 PCB 上没有焊接任何元件；我只是测量带状线的插入损耗。我有以下问题：（1）我听说网络分析仪的默认阻抗是50Ω，并且一般不能更改，这是正确的吗？（2）如果（1）是正确的，我的带状线的阻抗是100Ω。如果我直接连接到网络分析仪的四个端口进行测试，结果会不会因为阻抗不匹配而受到反射的影响，导致插损测量结果不佳？ (3) 如果(2)也正确，且阻抗我的带状线是100Ω，但它被制造成95Ω，使其更接近50Ω，这种方法会改善测量的插入损耗值吗？“请帮助我！！谢谢！！！！
Google Translate:
I have a PCB board...
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