Nonreciprocal Yagi-Uda Filtering Antennas

Journal ar
IEEE Antennas and Wireless Propagation Letters
  • Volumen: 18
  • Número: 12
  • Fecha: 01 December 2019
  • Páginas: 2661-2665
  • ISSN: 15485757 15361225
  • Source Type: Journal
  • DOI: 10.1109/LAWP.2019.2947847
  • Document Type: Article
  • Publisher: Institute of Electrical and Electronics Engineers Inc.
© 2002-2011 IEEE.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.

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