A Compact Low‐Profile Multilayer Log‐Periodic Metasurface Patch Antenna With Broadside Radiation

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Abstract
A multilayer log‐periodic metasurface patch antenna (LPMPA) operating in the 4–9‐GHz frequency range with broadside radiation is presented. This antenna array is characterized by its compact size and low profile. Each element of the LPMPA consists of a 2‐D periodic structure of 4 × 4 square patches, which can be viewed as a metasurface. The array is excited through aperture coupling in the ground plane beneath the radiators. The proper phase progression of the currents for a broadside radiation of the LPMPA′s elements in the active region is obtained by increasing the length of the feed line placed between adjacent radiators. The structure′s stop‐band caused by the excess of length between radiators is eliminated by increasing the characteristic impedance of the feed line to 70 Ω in the proximity of each slot. A prototype of the proposed antenna, consisting of four 2‐D periodic structures, is fabricated and tested. The obtained results show a 76% fractional bandwidth with gain ranges between 8 and 13 dB.
Funding Information
  • University Research Board, American University of Beirut (104552)
  • University of Wollongong

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