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http://dx.doi.org/10.5515/KJKIEES.2008.19.9.947

Miniaturized Conically Stepped COBRA for High Power Electromagnetic Generator  

Ahn, Ji-Hwan (Department of Electrical & Electronic Engineering, Yonsei University)
Lee, Sang-Heun (Department of Electrical & Electronic Engineering, Yonsei University)
Yoon, Young-Joong (Department of Electrical & Electronic Engineering, Yonsei University)
Kim, Jun-Yeon (Agency for Defense and Development)
Lee, Woo-Sang (Agency for Defense and Development)
So, Joon-Ho (Agency for Defense and Development)
Han, In-Hee (MTG)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.19, no.9, 2008 , pp. 947-956 More about this Journal
Abstract
In this paper, miniaturized conically stepped COBRA is proposed. In order to prevent electrical breakdown, COBRA, which consists of hem and lens, has to get bigger if it is designed with conventional method. Because of the phase error increase, shortening the length of the antenna without changing the aperture size leads to the reduction of the antenna gain. To avoid this, the phase error at the aperture is compensated by transforming the COBRA lens into conically stepped form. The simulations result shows that the proposed antenna has higher gain than the conventional COBRA in spite of the size reduction from 1,300 mm to 600 mm. The fabricated and measured COBRA has the gain of 26.2 dBi.
Keywords
High Power; COBRA; Phase Error; Miniaturization;
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