Abstract
Two novel short tapered leaky wave antenna (LWA) designs with a complementary split ring resonator (CSRR) structure are proposed in this paper. The CSRR structure is positioned at 1=4‚g away from the open-end edge of the LWA. For one of the antenna designs, the CSRR is placed at the ground plane; for the other one, the CSRR is placed on the antenna plane. The re∞ected wave caused by the open-end edge of the LWA is cancelled by the re∞ected wave caused by the CSRR, thus, the back lobe can be efiectively suppressed. The length of these two short tapered LWAs with CSRR design is only 1:2‚g at 4.3GHz. According to the measurement results, the impedance bandwidth is 650MHz for 7dB return loss, which covers the range from 4.3GHz to 4.95GHz. The back lobe can be suppressed efiectively about more than 12dB at the whole operating frequency band. The scanning range of the main beam is about 34 - , which cover the scanning angle from 10 - to 44 - .
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