Focus of high-power microwaves with positive and negative zone plate to increase the receiving power in axial virtual cathode oscillator
| Autor: | Doyoung Kim, Jun Sup Lim, Nagendra Kumar Kaushik, Sohail Mumtaz, Jung Hyun Jang, Seok Woo Lee, Eun Ha Choi |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Physics Focal point business.industry General Physics and Astronomy 02 engineering and technology Vircator Zone plate Pulsed power 021001 nanoscience & nanotechnology 01 natural sciences Cathode Power (physics) law.invention Optics law 0103 physical sciences Focal length General Materials Science Antenna (radio) 0210 nano-technology business |
| Zdroj: | Current Applied Physics. 29:89-96 |
| ISSN: | 1567-1739 |
| Popis: | We investigated an axial vircator, constructed in a pulsed power generator, called Chundoong, and simulated by a three-dimensional particle-in-cell simulation code, MAGIC. We attempted to increase the receiving power of generated microwaves by directing them at a desired focal point. To do so, a positive and negative zone plates (ZPs) are constructed at main frequency 3.5 GHz, and its focal length is 18.8 cm. The power generated from the virtual cathode is 0.72 GW, from which 24.6 kW is received by receiving antenna without a ZP. The receiving power increased significantly to 45.4 kW (92.6 %) and 47.5 kW (84.5 %) with positive and negative ZPs, respectively. In addition, both positive and negative ZPs have similar focusing properties for the generated microwaves. The ZP contributes significantly to increasing the receiving power. These findings might be useful for real applications to increase the receiving power at a desired focal point. |
| Databáze: | OpenAIRE |
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