A Novel ${\rm TM}_{01}$ to ${\rm TE}_{11}$ Mode Converter Designed With Radially Loaded Dielectric Slabs

A novel linear shaped TM
₀₁
to TE
₁₁
mode converter having high efficiency and wide bandwidth is proposed. The design consists of a circular waveguide sectored by a horizontal metallic plate partition, and dielectric slabs radially attached in the lower semicircular waveguide. The mode converter is designed and simulated at an operating frequency of 3 GHz. A maximum bandwidth of 504 MHz (2.81-3.35 GHz) with conversion efficiency greater than 90% is achieved when three Polytetrafluoroethylene (PTFE/Teflon) slabs are placed radially in the mode converter. The mode convertor was fabricated and experiments were performed with PTFE as the dielectric slab material. The mode conversion was verified by measuring the far-field radiation pattern. The proposed mode converter is symmetric, compact, linear, and easy to fabricate. It can be used for S-band high-power microwave applications where wide bandwidth of mode conversion is required.