Dual-band self-diplexed modulated metasurface antennas

Abstract : This paper presents a simple and effective technique to design dual-band modulated metasurface (MTS) antennas. In MTS apertures, an equivalent surface inductance supports the propagation of a transverse magnetic (TM) surface wave (SW). The SW power can be gradually radiated at one frequency by periodically modulating the surface reactance. Indeed, one can choose the period of the modulation so its interaction with the SW results in the (-1) indexed Floquet mode entering the visible region. Therefore, in order to achieve dual-band operation with a single aperture, one has to tailor a modulation able to radiate the SW power in the desired directions at both frequencies. The proposed approach consists in superimposing two modulations with different periods on the antenna aperture. One modulation produces beam #1 at frequency f1, whereas the other one generates beam #2 at frequency f2. The resulting inductive surface is then synthesized by means of sub-wavelength patches printed on a grounded dielectric slab. Moreover, it is possible to define a different position for the source of each modulation, which allows one to self-diplex the signals at f1 and f2. After providing basic design guidelines, we present numerical results for a design case consisting of an antenna with broadside pencil beams in the K and Ka bands. © Institution of Engineering and Technology.All Rights Reserved.
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Submitted on : Wednesday, February 20, 2019 - 3:37:09 PM
Last modification on : Thursday, June 20, 2019 - 3:36:43 PM

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M. Faenzi, D. González-Ovejero, F. Caminita, S. Maci. Dual-band self-diplexed modulated metasurface antennas. 12th European Conference on Antennas and Propagation, EuCAP 2018, Apr 2018, London, United Kingdom. ⟨10.1049/cp.2018.0842⟩. ⟨hal-02042769⟩

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