In this contribution, we report a new approach for the design of frequency reconfigurable antennas equipped with cognitive capabilities. Specifically, we show how the complex-valued input impedance of a wire antenna can be tuned by using an appropriate conformal metasurface. We prove that, by properly engineering the metasurface response, it is possible to modify the operative frequency of the antenna without compromising its radiation pattern and impedance matching with the source. As a relevant example, the case of a reconfigurable dipole antenna coated by a multi-layered metasurface loaded with varactor diodes is discussed. By tuning the junction capacitance of the varactors, the antenna operative frequency can be continuously shifted within a quite broad range of frequencies (2/3 octave bandwidth), enabling wideband reconfigurability capabilities.
Vellucci, S., Toscano, A., Bilotti, F., Monti, A., Barbuto, M. (2021). Coating metasurfaces enabling antenna frequency reconfigurability for cognitive radio system. In 2021 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, APS/URSI 2021 - Proceedings (pp.417-418). Institute of Electrical and Electronics Engineers Inc. [10.1109/APS/URSI47566.2021.9704464].
Coating metasurfaces enabling antenna frequency reconfigurability for cognitive radio system
Vellucci S.;Toscano A.;Bilotti F.;Monti A.;
2021-01-01
Abstract
In this contribution, we report a new approach for the design of frequency reconfigurable antennas equipped with cognitive capabilities. Specifically, we show how the complex-valued input impedance of a wire antenna can be tuned by using an appropriate conformal metasurface. We prove that, by properly engineering the metasurface response, it is possible to modify the operative frequency of the antenna without compromising its radiation pattern and impedance matching with the source. As a relevant example, the case of a reconfigurable dipole antenna coated by a multi-layered metasurface loaded with varactor diodes is discussed. By tuning the junction capacitance of the varactors, the antenna operative frequency can be continuously shifted within a quite broad range of frequencies (2/3 octave bandwidth), enabling wideband reconfigurability capabilities.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
