使用矢量网络分析仪测量滤波器

[{"insert":"矢量网络分析仪作为射频微波元器件性能评价的一个基本工具，有着广泛的应用，下面我们通过一个滤波器的测试过程来看一看矢量网络分析仪E5063A是如何测试一个射频微波元器件的。"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"attributes":{"align":"justify"},"insert":"\n"},{"attributes":{"bold":true},"insert":"— Step 1 —"},{"attributes":{"align":"justify"},"insert":"\n"},{"attributes":{"bold":true},"insert":"设置矢量网络分析仪E5063A的测试参数：起始和截至频率，中频带宽和测试点数，然后执行校准移除系统误差，这里我们使用了既快又准的E-cal校准。"},{"attributes":{"align":"justify"},"insert":"\n"},{"attributes":{"bold":true},"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/5ac7992ec68644f6.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"在校准前请观察E-Cal的LED指示灯是否已经变为绿色，绿色代表ECal已经准备完毕可以开始校准（如果您使用的是N755x系列电子校准件，它启动后即可开始校准，无需等待）。"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"另外一个必须注意的是要检查网分的源输出功率，避免损坏电子校准件或者让电子校准件过载。我们将源输出功率调整为 -15 dBm。把电子校准件的B端口连接到E5063A的端口1，电子校准件的A端口连接到SMA线缆的一端，注意要使用转矩扳手拧紧并开始校准。校准过程仅需几秒钟。"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/06063ac89920f615.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"bold":true},"insert":"— Step 2 —"},{"attributes":{"align":"justify"},"insert":"\n"},{"attributes":{"bold":true},"insert":"开始测量把被测件连接到E5063A的端口1，以及SMA线缆的一端。"},{"insert":"(SMA线缆的另外一端接的是E5063A的端口2)进行S11 端口1反射测量。测量结果会以对数显示 （默认情况）。"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/e6659d4095768cb0.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":" "},{"attributes":{"align":"justify"},"insert":"\n"},{"attributes":{"bold":true},"insert":"— Step 3 —"},{"attributes":{"align":"justify"},"insert":"\n"},{"attributes":{"bold":true},"insert":"对S参数测量结果进行数据分析测量S21(端口1和2之间的传输测量)。"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":"测量结果显示为trace 1"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/93835165329aa96e.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"增加一条新的trace2，显示S11测量结果。把trace1和trace2并列显示"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/ad58da82365b7b8c.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"将S11测量结果显示为史密斯图Smith Chart"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/5e841ef6942f6198.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"调整S21 trace1的比例"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/a678f971641ff0f3.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"在S21测量结果(trace 1)上打开一个marker, 搜索峰值"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/b4309a349ff9a794.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":"分析带通滤波器的带宽（E5063A提供了3dB带宽的计算功能 ）"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" "},{"insert":{"image":"https://community-1252773949.cos.ap-guangzhou.myqcloud.com/article/2034/cf3ef383c12e9b4f.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"insert":" "},{"attributes":{"align":"justify"},"insert":"\n"},{"attributes":{"italic":true},"insert":"来源：网络，如有侵权请联系"},{"attributes":{"align":"justify"},"insert":"\n"},{"insert":" \n"}]