Abstract
A leaky-wave antenna (LWA) based on split-ring-shaped spoof surface plasmon polaritons (SSPPs) is designed, simulated, and measured. We proposed a double-periodic patch-loaded method to suppress the open-stop band (OSB) effect and introduced an SSPP power divider with a 180° phase shift for the anti-phase excitation to enhance the gain in the main radiation direction of the antenna. Both methods are analyzed and verified. The investigated results show that both S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> and S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> are less than -10 dB in 7-11 GHz and no bulge is observed around the broadside radiation frequency of 10 GHz, demonstrating good OSB suppression (S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> < -26 dB, S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> < -45 dB). Furthermore, the LWA also demonstrates good performances with a wide-angle (-48° to +15°), high scanning rate (1.57°/%), high gain (10 dBi), and high average efficiency (97%). This work provides a new way to realize efficient OSB suppression for LWA designs.
Published Version
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