Investigation of a metallic photonic crystal high power microwave mode converter
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TLDR
In this article, an L band metallic photonic crystal TEM-TE11 mode converter is proposed for narrow band high power microwave application, where the mode converter was realized by partially filling metal photonic crystals along azimuthal direction in a coaxial transmission line for phase shifting.Abstract:
It is demonstrated that an L band metallic photonic crystal TEM-TE11 mode converter is suitable for narrow band high power microwave application. The proposed mode converter is realized by partially filling metallic photonic crystals along azimuthal direction in a coaxial transmission line for phase-shifting. A three rows structure is designed and simulated by commercial software CST Microwave Studio. Simulation results show that its conversion efficiency is 99% at the center frequency 1.58 GHz. Over the frequency range of 1.56-1.625 GHz, the conversion efficiency exceeds 90 %, with a corresponding bandwidth of 4.1 %. This mode converter has a gigawatt level power handling capability which is suitable for narrow band high power microwave application. Using magnetically insulated transmission line oscillator(MILO) as a high power microwave source, particle-in-cell simulation is carried out to test the performance of the mode converter. The expected TE11 mode microwave output is obtained and the MILO works well. Mode conversion performance of the converter is tested by far-field measurement method. And the experimental result confirms the validity of our design. Then, high power microwave experiment is carried out on a Marx-driven Blumlein water line pulsed power accelerator. Microwave frequency, radiated pattern and power are measured in the far-field region and the results agree well with simulation results. The experiment also reveals that no microwave breakdown or pulse shortening took place in the experimental setup.read more
Citations
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Development of a Ka -Band Circular TM 01 to Rectangular TE 10 Mode Converter
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TL;DR: In this article, the authors developed a compact Ka-band circular TM01 to rectangular TE10 mode converter, which adopts an all-metal waveguide structure and facilitates notable improvement in the system power capacity and is capable of realizing high power propagation.
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