Abstract
In this paper, a novel double-layered microstrip metamaterial beam scanning leaky wave antenna (LWA) is proposed and investigated to achieve consistent gain and low cross-polarization. Thanks to the continuous phase constant changing from negative to positive values over the passband of the double-layered microstrip metamaterial, the proposed LWA, which consists of 20 identical microstrip metamaterial unit cells, can obtain a continuous beam scanning property from backward to forward directions. The proposed LWA is fabricated and measured. The measured results show that the fabricated antenna obtains a continuous beam scanning angle of 140° over the operating frequency band of 3.80–5.25 GHz (32%), the measured 3 dB gain bandwidth is 30.17% with maximum gain of 11.7 dB. Besides, the measured cross-polarization of the fabricated antenna keeps at a level of at least 30 dB below the co-polarization across the entire radiation region. Moreover, the measured and simulated results are in good agreement with each other, indicating the significance and effectiveness of this method.
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Acknowledgements
This work was supported by Doctoral Research Foundation of North China University of Science and Technology, Hebei Natural Science Foundation of China (No. F2014209276, NO. A2015209040), and the National Natural Science Foundation of China (No. 61372034, No. 11401160). The authors would like to express their gratitude to anonymous reviewers for their helpful comments and China North Electronic Engineering Research Institute for the fabrication.
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An, Yl., Tan, Yl., Zhang, Hb. et al. Double-layered microstrip metamaterial beam scanning leaky wave antenna with consistent gain and low cross-polarization. Appl. Phys. A 123, 738 (2017). https://doi.org/10.1007/s00339-017-1370-y
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DOI: https://doi.org/10.1007/s00339-017-1370-y