Rf Dielectric loss tangent

2021/09/20
---
layout: post
title:关于损耗角正切(耗散系数)
categories: [电路, 射频]
description: 日拱一卒...
keywords: Dielectric Loss Tangent, 损耗角正切, 耗散系数, 品质因数Q
---

摘要

Ludwig的《射频电路设计-理论与应用RF Circuit Design Theory Appliacations》对于损耗角正切有较多变动,有的地方第2版反而没有第1版写得清晰明确。这篇短文从损耗角正切的定义、串并联电路中的计算、相关习题等角度做了点梳理。

Dielectric Loss Tangent-损耗角正切或耗散系数定义:

tanΔ=耗能/储能=1/Q

第2版的一章小结中讲道:“电容器和电感器的一个重要参数是品质因数Quality Factor-Q。它与损耗角正切或耗散系数Dissipation Factor直接相关,并成反比,即品质因数Q越高,损耗角正切越低。这种反比关系可以从简单的电路模型导出。”

并联形式及相关公式

串联形式及相关公式

参考资料

https://www.electronics-notes.com/articles/basic_concepts/capacitance/esr-dissipation-factor-loss-tangent-q.php http://academy.cba.mit.edu/classes/input_devices/meas.pdf

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