The Calculation of TEM-, TE- and TM-Waves in Shielded Strip Transmission Lines

For the systematic deveIopment af new TEM-microwave components the accurate calculation of the TEM-wave characteristic impedance is necessary. Besides the characteristic impedance the properties af TE- and TM-modes in new configuratians are important. By TE- or TM-modes in a device designed for TEM-waves the function of this device is gravely disturbed. As the probabiIity of TE- or TM-modes growths with frequency increasing this question is important especialIy at microwave frequencies.