A Circularly Polarized Frequency Beam-Scanning Antenna Fed by a Microstrip Spoof SPP Transmission Line

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Abstract
In this letter, a planar frequency beam scanning antenna (FBSA) with circularly polarized (CP) radiation property is proposed. The beam scans along the narrow side and in lateral plane of the antenna. The antenna consists of two layers: eight periodic symmetrical patches are presented on the top layer as radiation elements to generate CP beam; while microstrip spoof surface plasmon polariton (SPP) transmission line is used as the feeding line, which improves the beam scanning range obviously. The antenna has been fabricated and measured to verify the theory analysis. Measured results indicate that the main beam scans from -5° to +37° in lateral plane within the operating frequency band from 12 to 16.5 GHz, of which excellent CP characteristic is also realized. The peak gain of the antenna is about 9.5dBi over the whole band.
Funding Information
  • National Defense Pre-Research Foundation of China (3602004)
  • State Key Laboratory of Millimeter Waves (K201715)
  • Southeast University
  • China Postdoctoral Science Foundation (2016M600349, 2017T100316)
  • Natural Science Foundation of Jiangsu Province (BK20160080)

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