AN APPROXIMATE THEORY OF THE CAVITY RESONATOR METHOD OF DETERMINING THE DIELECTRIC LOSS OF SOLIDS AT MICROWAVE FREQUENCIES

Abstract

The field  equations  in  a  cylindrical  cavity  resonator  and  the  perturbation  formula  due  to  Bethe  and  Schwinger  (l943)  are  utilised  to  calculate  the  real  part  E'  and  the  imaginary  part  E"  of  the  generalised  dielectric  coefficient  of  a  small  sample  of  solid  dielectric  rod.  The  loaded  Q  of  the  cavity  is  also  calculated  with  the  help  of  the  field  equations  and  the  Poynting  vector.