This article introduces the method of extending noise figure meter HP 8970a measurement frequency range.
本文介绍了扩展噪声系数表hp 8970a测量频率范围的方法。
By considering the influence of radiation effect and higher order modes, the measurement frequency range has successfully extended to X-band.
由于考虑了辐射效应和高次模的影响，测量频率范围成功地扩展到了X波段。
Johnson noise is uniformly distributed over a wide frequency range, so reducing the noise bandwidth effectively decreases the noise in the measurement.
约翰逊噪声在很宽的频率范围内呈均匀分布，所以减小噪声带宽能够有效地降低测量中的噪声。
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