Bandwidth and gain improvement of a crossed slot antenna with metasurface

Research output: Contribution to journalArticle


A wideband metasurfaced (MS) slot antenna is proposed for circularly polarized (CP) operation. The antenna consists of a crossed slot antenna (CSA) and a MS placed at a short distance above the CSA. The CSA has two slots placed in orthogonal positions and with distributed elements to generate two E-fields with 90°-phase difference for CP radiation. A microstrip line is used to single feed the CSA at the center. Simulations and measurements are used to study and design the MS slot antenna. The measured results show that, with the use of the MS, the impedance bandwidth can be increased from 4.24–6.78 GHz (2.54 GHz, 46.1%) to 3.36–6.91 GHz (3.55 GHz, 69.13%), and the axial-ratio bandwidth (ARBW) can be increased from 4.38–4.96 GHz (0.58 GHz, 12.4%) to 3.96–6.02 GHz (2.06 GHz, 41.28%). Within the ARBW, the realized co-polarized gain can be increased by about 3 dB on average.


  • Changfei Zhou
  • Sing Wai Cheung
  • Qinlong Li
  • Min Li
External organisations
  • University of Hong Kong
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Communication Systems
Original languageEnglish
Article number110, 211603
JournalApplied Physics Letters
Issue number21
Publication statusPublished - 2017
Publication categoryResearch
Externally publishedYes