ABSTRACT
In this chapter, the authors examine the quasistatic mode properties of such striplines, and discuss two important classes of modes in the study of such transmission lines: transverse electromagnetic (TEM) and quasi-TEM modes. They begin this chapter by discussing the general properties of TEM modes, and then proceed to discuss the characteristics of some quasi-TEM modes. Since TEM structures, often referred to as transmission lines, are usually connected between localized circuits, it is useful to associate some circuit concepts with the TEM mode. The concept is applicable whenever the dimensions of the conductor cross-section are small by comparison with the distance of the conductor from any other object. Equivalent radii for conductors of other cross-sections are given in the references cited at the end of this chapter. The chapter concludes with some applications to specific types of planar transmission-lines.
