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二、带宽法的原理与实践带宽法(也叫谐振法)的实质就是测量同轴电缆的无载 Q 值,在实际测量时是用测试其半功率频率宽度的方法来实现的,因此称它为“带宽法”比较确切。带宽法测量系统,可以十分精确,方便地测量出同轴电缆的衰减,同时还可以测量同轴电缆的平均特性阻抗 Z_m、速比 U/C 及等效介电常数ε_r。所采用的仪器设备均为市售。
Second, the principle and practice of bandwidth law Bandwidth method (also called resonant method) is the essence of measuring coaxial cable unloaded Q value in the actual measurement is to test its half-power frequency width of the method to achieve, so call it For the “Bandwidth Law” more exact. Bandwidth measurement system can be very accurate and easy to measure the coaxial cable attenuation, but also can measure the average coaxial cable impedance Z_m, speed ratio U / C and equivalent dielectric constant ε_r. The equipment used are commercially available.