Periodic printed semi-annular substrate loaded TM₀₁–TE₁₁ mode converter

Abstract

A mode converter design using the concept of periodic substrates loading in a circular waveguide, to convert TM01 mode to TE11 mode is presented in this paper. The detailed design principle, simulation, and measurement results are included in this study. Simulation results show that the purity of output fundamental TE11 mode of the converter approaches 99.2% for an operating frequency of 3.2 GHz. The mode conversion efficiency is more than 90% over 3.07–3.25 GHz band and the relative bandwidth is 5.6% (180 MHz). The proposed TM01–TE11 mode converter has advantages, such as the compact, lightweight structure, high conversion efficiency, and proper bandwidth. The fabrication cost is relatively low and the structure is easy to fabricate. The power-handling capability is limited to 10 MW due to dielectric-based design. The compactness and portability of the system (e.g. Space applications, Accelerators, High Power Microwave) can be improved significantly using the proposed mode converter.

A compact ultra-wideband square and circular slot ground plane planar antenna with a modified circular patch

“…This massive commercial success has caused rapid advancement in the design and development of these printed antennas. Several structures have been reported for the ultra-wideband (UWB) spectrum by making different slots: curved, rectangular, circular, "L" profile, triangular, semi-circular, and (U)-profile [1][2][3][4][5][6]. By making two rectangular slits in the backplane and cutting curved-shaped slots in the element, bandwidth enhancement is reported [7].…”