Properties of a H????????01????????E????????01 mode transducer constructed to excite dielectric rod aerials in E01 mode at X-band have been studied by Deschamps method. Scattering parameters, launching efficiency, etc. of the mode transducer are compared with those of a H????????01????????H????????11 mode transducer used for exciting a dielectric rod aerial in HE11 mode. Expressions for the scattering matrix (????????) of the dielectric rod and launching efficiency are derived.
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