Nonreciprocal_Antenna_In_Polarization_TechrXiv.pdf (1.03 MB)
Download fileTime-modulated Patch Antennas with Tunable and Nonreciprocal Polarization Ellipticity
preprint
posted on 2022-03-28, 06:02 authored by James Do, Jiawei Zang, Alejandro Alvarez Melcon, J. Sebastian Gomez DiazJ. Sebastian Gomez DiazIn this paper, we propose and demonstrate time-modulated
patch antennas able to exhibit opposite polarization ellipticity when operated
in transmission or reception, effectively leading to nonreciprocal polarization
responses. To this purpose, we merge a patch antenna fed from four symmetrical
sides with a low-frequency time-modulation scheme. This configuration exploits
the photonic Aharonov Bohm effect to individually manipulate the phase of
surface currents flowing along orthogonal directions on the antenna with the
phase of the modulation signals. Experimental results at 2.2 GHz demonstrate
high conversion efficiency in the time-modulation process (loss
3 dB), isolation
levels over 40 dB in transmission/reception mode, and tunability to generate/receive
electromagnetic waves with arbitrary polarization ellipticity. Our findings may
enable exciting applications in full-duplex communications as well as in
polarimetric radar, sensing and imaging systems.
Funding
National Science Foundation with CAREER Grant No. ECCS-1749177
Ministerio de Economia y Competitividad of Spain and the European Regional Development Funds with Grant No: PID2019-103982RB-C42)
National Natural Science Foundation of China with Grant No. 62001520.
History
Email Address of Submitting Author
jsgomez@ucdavis.eduSubmitting Author's Institution
University of California, DavisSubmitting Author's Country
- United States of America