一、引言在设计微带器件时,经常遇到计算某些微带线的特性阻抗的问题。当微带线的结构很简单时,如图1所示,有表可查;当微带线的结构稍复杂一点时,问题就开始复杂化,有时只能通过实测或估算来确定特性阻抗的范围了。本文通过一个应用于FET放大器中的微带线的实例,如图2,试图介绍一种较精确计算特性阻抗Z_0的方法,该法借助于保角变换和椭圆函数等数学工具。 I. INTRODUCTION In the design of microstrip devices, we often encounter the problem of calculating the characteristic impedance of some microstrip lines. When the microstrip line structure is very simple, as shown in Figure 1, a table can be found; when the structure of the microstrip line a bit more complicated, the problem began to be complicated, and sometimes only through the measured or estimated to determine the characteristic impedance Range. In this paper, an example of a microstrip line used in a FET amplifier is shown in Figure 2. This paper attempts to introduce a more accurate method of calculating the characteristic impedance Z_0 by means of mathematical tools such as conformal mapping and elliptic functions.