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A Printed Leaky-Wave Antenna Based on a Sinusoidally-Modulated Reactance Surface

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2 Author(s)
Patel, A.M. ; Dept. of Electr. Eng. & Comput. Sci., Univ. of Michigan-Ann Arbor, Ann Arbor, MI, USA ; Grbic, A.

A simple procedure for designing a sinusoidally-modulated reactance surface (SMRS) that radiates at an arbitrary off-broadside angle is outlined. The procedure allows for nearly independent control of the leakage and phase constants along the surface. Printing an array of metallic strips over a grounded dielectric substrate is discussed as a way to practically implement the theoretical SMRS. A method of mapping the gaps between metallic strips to a desired surface impedance is presented as an efficient alternative to mapping methods used in the past. A printed leaky-wave antenna with a sinusoidally-modulated surface reactance is designed using the procedure mentioned above. The TM-polarized antenna radiates at 30° from broadside at 10 GHz, and exhibits an experimental gain of 18.4 dB. Theoretical, simulated, and experimental results are presented.

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Antennas and Propagation, IEEE Transactions on  (Volume:59 ,  Issue: 6 )