Single-Layer, Unidirectional, Broadside-Radiating Planar Quadrupole Antenna for 5G IoT Applications

Rocio Rodriguez-Cano, Richard W. Ziolkowski

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


In this article, an innovative quadrupole-based broadside-radiating unidirectional antenna is designed at 28.475 GHz for fifth-generation (5G) Internet of Things (IoT) applications. The planar antenna is based on a single-layer technology and realized on a flexible substrate to facilitate conformal applications. It consists of a coax-fed-driven dipole and two quadrupolar near-field resonant parasitic (NFRP) elements. The broadside-radiating design achieves a unidirectional pattern with a realized gain of 4.85 dBi and a front-to-back ratio of 9.4 dB. The total efficiency of the antenna is 85%. A differential-fed prototype was designed, fabricated, and tested at 1.579 GHz to make the measurements more manageable. The measured and simulated results are in good agreement.

Original languageEnglish (US)
Article number9362181
Pages (from-to)5224-5233
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Issue number9
StatePublished - Sep 2021
Externally publishedYes


  • Broadside radiation
  • high efficiency
  • Internet of Things (IoT)
  • planar antennas
  • unidirectional pattern

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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