Analysis of the propagation properties in an inverted strip dielectric guide

In this paper the conditions are derived which the three lowest modes satisfy respectively in an inverted strip dielectric guide (ISDG). The method of optimal design is dealt with for five parameters selected by the Orthogonal Array Table (OAT), which affect the propagation properties including the single-mode bandwidth, the external field divergence, the conductor and the dielectric losses. Many sets of parameters are presented, for which the ISDG s have optimal propagation properties.