ADMITTANCE CHARACTERISTICS OF NARROW RADIATING SLOTS IN NONRADIATING DIELECTRIC WAVE-GUIDE

A study of an inclined slot cut in the metal wall of nonradiative diel ectric (NRD) waveguide is presented. The modal expansion method is app lied to the development of an equivalent network of a slot discontinui ty in NRD waveguide, using the reciprocity and Poynting theorems. The effect of the metal wall thickness is taken into consideration by appl ying microwave network analysis. Numerical data for the normalised slo t admittance is obtained and compared with experimental results. Good agreement is observed. Numerical data for the slot admittance for vari ous dielectric materials is also presented and the radiation patterns of a single slot are included.