Nonreciprocal Yagi-Uda Filtering Antennas

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

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


This letter proposes a novel and compact nonreciprocal filtering antenna based on temporal modulation. The device is composed of a third-order filtering section integrated into a Yagi-Uda planar printed antenna. Strong nonreciprocity in transmission and reception is achieved at the same operation frequency by time-modulating the resonators of the filtering section. These resonators are implemented as quarter-wavelength microstrip lines terminated with varactors located on the ground plane. Such plane is also employed as a reflector for the Yagi-Uda antenna and to host the coplanar waveguides that feed low-frequency signals to the varactors, thus leading to a very compact design. A prototype is manufactured and successfully tested at 2.4 GHz, showing isolations greater than 20 dB between transmission and reception modes in both E- and H-planes for all directions in space and a gain drop of only 3.5 dB compared to a reference antenna. The proposed devices can easily be integrated with other electronic circuits and may find exciting applications in communication, radar, and sensing systems.

Original languageEnglish (US)
Article number8871166
Pages (from-to)2661-2665
Number of pages5
JournalIEEE Antennas and Wireless Propagation Letters
Issue number12
StatePublished - Dec 2019


  • Filtering antennas
  • nonrecipocal devices
  • spatio-temporal modulations
  • time-modulated resonators

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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