Compact TM01 to TE11 Mode Converter Designed with Matching Sections

A method for designing compact TM01 to TE11 mode converter using dielectric slabs with matched sections is proposed in this letter. The dielectric slabs are fixed in a circular waveguide sectored by thin metallic plate partition. The designs incorporate the quarter wavelength dielectric matching section utilizing two methods i.e. inserting a different dielectric material and horizontal corrugation of existing dielectric material to minimize the length of circular waveguide mode converter. The mode converter is designed to operate at the center frequency of 3 GHz with maximum conversion efficiency of 98.4% and a bandwidth of nearly 12% for both types of matching sections. For practical realization of the concept, Teflon and FR4 are used as dielectric materials. The proposed mode converter is linear, symmetric and easy to fabricate and moreover, a length of 1.7 lambda provides the advantage of being light weight and compact.