基于慢波基片集成波导的高增益连续扫描周期漏波天线

A substrate integrated waveguide (SIW) periodic leaky-wave antenna (PLWA) with increased gain and continuous beam scanning through broadside is proposed by loading slow-wave (SW) structures. Slow wave structure in the form of periodic blind via-holes with loaded patches decelerates the phase velocity of the electromagnetic wave traveling in SIW, reducing the guided wavelength by 50%. Compared with normal SIW PLWA, the distance between the adjacent radiating slots in the proposed SW-SIW PLWA is decreased by half, allowing twice as many radiating slots in SW-SIW PLWA with the same length. Therefore, the radiation efficiency and the gain of SW-SIW PLWA can be significantly increased. Furthermore, the loaded patches of slow wave structure under the radiating slots are extended to improve the impedance match of the radiating slots and suppress the reflected wave, so the open-stopband (OSB), which is a common drawback of the PLWA, is suppressed. In consequence, the radiation beam can scan from backward to forward direction continuously. A prototype of the proposed SW-SIW PLWA is manufactured and measured, the scanning angle of the proposed PLWA reaches 72.7° during the operating frequency range of 13.4~15.4 GHz with maximum gain of 8.47 dBi. The measured results agree well with the simulations.