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A dielectric image line (DIL)‐based leaky wave antenna (LWA) with H‐shaped grooves is proposed in this paper. By periodically carving a set of H‐shaped grooves in the ground of the DIL, infinite space harmonics are excited, and the proposed antenna works with n = −1 order mode. The H‐shaped radiator can effectively eliminate open stopband (OSB). Over the operating band from 11.1 GHz to 15 GHz, the...
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