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ISSN Druckformat: 0040-2508
ISSN Online: 1943-6009
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DESIGN OF A COMPACT MODE CONVERTER WITH PERIODIC METALLIC OCTAGON STRUCTURE FOR HPM APPLICATIONS
ABSTRAKT
A compact mode converter design for transverse magnetic (TM)/transvere electric (TE) (TM01−TE11 ) conversion is proposed. The design consists of a periodic metallic octagonal structure placed on a rectangular ridge in the lower-half section of a circular waveguide. In the simulation results, a maximum mode conversion efficiency of 98% was observed at an operating frequency of 3.2 GHz. The efficiency of the mode converter was greater than 90% over a bandwidth of 140 MHz. The mode conversion capability of the proposed structure was validated by measuring its far-field radiation pattern. The simulated and measured reflection coefficient with TM01 mode excitation at an input port was below -10 dB over a frequency range of 2.75-3.25 GHz. The proposed mode converter has high-power handling capability up to 300 MW. It is compact, symmetric, and lightweight, and has an easy to fabricate structure. Therefore, it can be used for airborne and portable high-power microwave systems.
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