Ederra Urzainqui, ÍñigoTellechea Pereda, AmagoiaCaminita, FrancescoMartini, EnricaIriarte Galarregui, Juan CarlosGonzalo García, RamónMaci, Stefano2018-01-232018-01-232016A. Tellechea Pereda et al., "Dual Circularly Polarized Broadside Beam Metasurface Antenna," in IEEE Transactions on Antennas and Propagation, vol. 64, no. 7, pp. 2944-2953, July 2016. doi: 10.1109/TAP.2016.25626620018-926X (Print)1558-2221 (Electronic)10.1109/TAP.2016.2562662https://academica-e.unavarra.es/handle/2454/26915This paper presents the design of a modulated metasurface (MTS) antenna capable to provide both righthand (RH) and left-hand (LH) circularly polarized (CP) boresight radiation at Ku-band (13.5 GHz). This antenna is based on the interaction of two cylindrical-wavefront surface wave (SW) modes of transverse electric (TE) and transverse magnetic (TM) types with a rotationally symmetric, anisotropic-modulated MTS placed on top of a grounded slab. A properly designed centered circular waveguide feed excites the two orthogonal (decoupled) SW modes and guarantees the balance of the power associated with each of them. By a proper selection of the anisotropy and modulation of the MTS pattern, the phase velocities of the two modes are synchronized, and leakage is generated in broadside direction with two orthogonal linear polarizations. When the circular waveguide is excited with two mutually orthogonal TE11 modes in phase–quadrature, an LHCP or RHCP antenna is obtained. This paper explains the feeding system and the MTS requirements that guarantee the balanced conditions of the TM/TE SWs and consequent generation of dual CP boresight radiation.application/pdfengCopyright © 2016 IEEE. Personal use is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.AntennasDual polarizationLeaky wavesLeft-hand circular polarization (LHCP)Metasurfaces (MTSs)Right-hand circular polarization (RHCP)Surface impedanceSurface waves (SWs)info:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess