Analysis and Design of Reflectarray Antennas Based on Delay Lines: A Filter Perspective

Jiawei Zang, Eduardo Carrasco, Xuetian Wang, Alejandro Alvarez-Melcon, Juan Sebastian Gomez-Diaz

Research output: Contribution to journalReview articlepeer-review

1 Scopus citations


The analysis and design of reflectarray (RA) antennas based in delay lines is introduced for the first time from a filter perspective. To this purpose, each unit-cell of the RA is considered as a network composed of two ports, one being the delay line and the other one the free-space. This approach allows to borrow the coupling matrix formalism from filter theory and apply it to design unit-cells exhibiting broadband operation together with very sharp frequency responses. The concept is demonstrated with the aid of planar printed unit-cells coupled to substrate integrated waveguides (SIWs) through slots, a configuration that offers significant advantages to shape its frequency response while providing relatively low loss. With the aim of validation, a third order filter structure integrated in SIW-based unit-cells has been experimentally tested using the waveguide simulator technique, at a center frequency of 9 GHz. Measurements demonstrate a high-quality linear phase variation and range, and large frequency selectivity together with broadband response for the element of about 18%. The experimental results show the feasibility of this approach for the design of broadband reflectarray antennas exhibiting sharp gain responses. To illustrate the concept, a medium size reflectarray has been theoretically designed using the proposed unit cell at 9 GHz, showing a directive beam with 35.8 dB gain, sharp gain selectivity over 18 dB, and confirms the wide band operation with 20.3% bandwidth for a 3 dB gain variation.

Original languageEnglish (US)
Article number9016200
Pages (from-to)44947-44956
Number of pages10
JournalIEEE Access
StatePublished - Jan 1 2020


  • Broadband antennas
  • Delay-line elements
  • Filter theory
  • Gain selectivity
  • Reflectarray antennas
  • Substrate integrated waveguide

ASJC Scopus subject areas

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)


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