Abstract
An antenna for high power microwave (HPM) radiation should be required for HPM immunity test. In this paper, the design of longitudinal slotted waveguide array antenna for narrowband HPM is described. This antenna is connected to HPM source through WR-284 waveguide. To avoid electrical breakdown in the aperture for air condition, we first perform an electric field analysis on three baseline slots by using CST-Microwave studio. The overall slot array is composed of $\pmb{16\times 16}$ radiating slots and is divided into $\pmb{8\times 4}$ sub-arrays. The sub-array is connected to the multi-stage divider, which is designed so that the applied MW-class HPM signal decreases below the breakdown level at sub-array input. We improved the septum divider and analyzed its characteristics according to the corner radius. The simulation results for overall antenna shows that it has 21.8 dB return loss, 32.06dBi antenna gain. The maximum E-field value at overall antenna is 2.67MV/m for applied HPM signal. The fabricated prototype antenna and measured data for HPM radiation is presented.
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