论文部分内容阅读
本文导出了在通过式微波功率计输出端连接具有分布损耗的传输线和失配负载时,计算功率测量误差的公式。文中引入了数值计算实例。结果表明,对于采用单个晶体检波器和两个晶体检波器的功率计而言,无论|p_1|和L为什么数值,损耗——失配误差|△_(1m)|均可忽略。对于采用单定向耦合器的功率计,当| p_1|>0.4和L≥0.1分贝时,|△_(1m)|便不可忽略。对于采用双定向耦合器的功率计,当|p_1|=0.2,L≥0.6分贝时,|△_(lm)|便不可忽略。而当|p_1|>0.6时,则|△_(1m)|将大于仅由于传输线损耗而产生的测量误差。
This paper derives the formula for calculating the power measurement error when connecting a transmission line with distributed loss and a mismatched load at the output of a microwave power meter. In this paper, a numerical example is introduced. The results show that, for a power meter with a single crystal detector and two crystal detectors, the loss-mismatch error | △ _ (1m) | is negligible regardless of the value of | p_1 | and L. For a power meter with a single directional coupler, | Δ _ (1m) | can not be ignored when | p_1 |> 0.4 and L ≥ 0.1 dB. For power meters with dual directional couplers, | Δ _ (lm) | is not negligible when | p_1 | = 0.2 and L ≥ 0.6 dB. When | p_1 |> 0.6, then | Δ _ (1m) | will be larger than the measurement error due to transmission line loss only.