In this letter, a new quasi-uniform leaky-wave antenna is proposed. The structure of antenna is based on an air-filled rectangular waveguide in which the radiation occurs through transverse slots on the broad wall of the waveguide. This antenna is designed using a systematic method based on the thinned array theory in order to achieve a low side-lobe level (SLL). The designed antenna radiates at center frequency of 10 GHz at θ=60∘ with the SLL of about –20 dB. The proposed antenna scans a part of forward quadrant with low SLL and high gain over the frequency band of 9.8–10.2 GHz. Simulated and measurement results of the antenna are investigated; there is a good consistency between measurement and simulation results.

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