59、横向共振技术及其在波导分析中的应用

横向共振技术及其在波导分析中的应用

1. 横向共振技术概述

横向共振技术是一种用于计算波导结构特性的重要方法，如截止频率、传播常数和有效介电常数等。下面我们将详细介绍相关的计算机程序示例，以及如何使用这些程序来分析波导结构。

1.1 第一个程序示例

以下是一个用于计算波导截止频率和传播常数的程序：

CALL ROOT(CHARFUNCT, ... )
C
C THIS ROUTINE <NOT PROVIDED IN THIS llSTING) SHOULD
C COMPUTE THE ROOT OF THE CHARACTERISTIC EQUATION
C C ZERO OF ''CHARFUNCT
0 >. THE ROOT COMPUTED IS THE
C CUTOFF FREQUENCY.
C
PRINT*
PRINT 102,FREQ*1.D-9
102 FORMAT (1X, 'THE CUTOFF FREQUENCY IS:', FS.3,' GHZ')
PRINT *
C
C
C
PRINT*, 'FREQUENCY OF INTEREST? (GHZ)'
PRINT*,' (MUST BE GREATER THAN CUTOFF)'
READ
*, fREQ
FREQ=FREQ*1.E+9
IVAR=1
C
CALL ROOT(CHARFUNCT, ... )
C
C IN THIS CASE (IVA~~ 1) THE ROOT COMPUTED IS THE
C PROPAGATION CONSTANT uBETA" AT THE GIVEN FREQUE