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Quevedo-Teruel, OscarORCID iD iconorcid.org/0000-0002-4900-4788
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Publications (10 of 62) Show all publications
Bagheriasl, M., Quevedo-Teruel, O. & Valerio, G. (2019). Bloch Analysis of Artificial Lines and Surfaces Exhibiting Glide Symmetry. IEEE transactions on microwave theory and techniques, 67(7), 2618-2628
Open this publication in new window or tab >>Bloch Analysis of Artificial Lines and Surfaces Exhibiting Glide Symmetry
2019 (English)In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 67, no 7, p. 2618-2628Article in journal (Refereed) Published
Abstract [en]

Glide-symmetric structures have recently emerged as a smart choice to design planar lenses and electromagnetic bandgap materials. We discuss here the conditions under which a glide-symmetric structure is equivalent to a nonglide-symmetric structure with a reduced period. To this aim, we propose an analysis method based on network theory to efficiently derive the dispersive behavior of these periodic structures. Both phase and attenuation constants can be determined, with potential applications to both guiding and radiating structures. Retaining higher order modal interactions among cells helps to derive the dispersive behavior of periodic structures more accurately. Furthermore, we take advantage of the higher symmetry of these structures to decrease the computational cost by considering only one half or one-quarter of a unit cell instead of the entire cell. We study one and 2-D glide-symmetric structures and confirm the validity of our analysis with comparisons from commercial software.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
Keywords
Dispersion analysis, glide symmetry, higher symmetry, periodic structures, transmission matrix
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-255424 (URN)10.1109/TMTT.2019.2916821 (DOI)000473597700016 ()2-s2.0-85068451481 (Scopus ID)
Note

QC 20190815

Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-15Bibliographically approved
Padilla, P., Palomares-Caballero, A., Alex-Amor, A., Valenzuela-Valdes, J., Fernandez-Gonzalez, J. M. & Quevedo-Teruel, O. (2019). Broken Glide-Symmetric Holey Structures for Bandgap Selection in Gap-Waveguide Technology. IEEE Microwave and Wireless Components Letters, 29(5), 327-329
Open this publication in new window or tab >>Broken Glide-Symmetric Holey Structures for Bandgap Selection in Gap-Waveguide Technology
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2019 (English)In: IEEE Microwave and Wireless Components Letters, ISSN 1531-1309, E-ISSN 1558-1764, Vol. 29, no 5, p. 327-329Article in journal (Refereed) Published
Abstract [en]

In this letter, we propose a new technique to tune the bandgap in gap-waveguide technology based on broken glide-symmetric holey structures. We demonstrate that breaking the glide-symmetry in a proper manner provokes the presence of a passband within the bandgap due to the frequency sweep of the second propagating mode. This passband generates field leakage in the gap that is translated into a filtering property. This filtering effect may be used to reduce or eliminate filters in large complex devices. In order to avoid undesired coupling due to the leakage from the air gap between the plates, an absorbing sheet is proposed to dissipate the undesired fields. This idea has been numerically studied and experimentally validated with a specific design, a WR15-size gap-waveguide prototype with glide-symmetric holes with filtering properties.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
Keywords
Gap-waveguide, glide symmetry, higher symmetries, periodic structures, selected bandgap
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-252624 (URN)10.1109/LMWC.2019.2906460 (DOI)000467572600007 ()2-s2.0-85064411329 (Scopus ID)
Note

QC 2019603

Available from: 2019-06-03 Created: 2019-06-03 Last updated: 2019-06-03Bibliographically approved
Dahlberg, O., Valerio, G. & Quevedo-Teruel, O. (2019). Fully Metallic Flat Lens Based on Locally Twist-Symmetric Array of Complementary Split-Ring Resonators. Symmetry, 11(4), Article ID 581.
Open this publication in new window or tab >>Fully Metallic Flat Lens Based on Locally Twist-Symmetric Array of Complementary Split-Ring Resonators
2019 (English)In: Symmetry, ISSN 2073-8994, E-ISSN 2073-8994, Vol. 11, no 4, article id 581Article in journal (Refereed) Published
Abstract [en]

In this article, we demonstrate how twist symmetries can be employed in the design of flat lenses. A lens design is proposed, consisting of 13 perforated metallic sheets separated by an air gap. The perforation in the metal is a two-dimensional array of complementary split-ring resonators. In this specific design, the twist symmetry is local, as it is only applied to the unit cell of the array. Moreover, the twist symmetry is an approximation, as it is only applied to part of the unit cell. First, we demonstrate that, by varying the order of twist symmetry, the phase delay experienced by a wave propagating through the array can be accurately controlled. Secondly, a lens is designed by tailoring the unit cells throughout the aperture of the lens in order to obtain the desired phase delay. Simulation and measurement results demonstrate that the lens successfully transforms a spherical wave emanating from the focal point into a plane wave at the opposite side of the lens. The demonstrated concepts find application in future wireless communication networks where fully-metallic directive antennas are desired.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
twist symmetry, lens antenna, complementary split-ring resonator, complementary split ring resonator (CSRR)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-252649 (URN)10.3390/sym11040581 (DOI)000467314400140 ()2-s2.0-85065500834 (Scopus ID)
Note

QC 20190610

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-06-10Bibliographically approved
Tamayo-Dominguez, A., Fernandez-Gonzalez, J.-M. & Quevedo-Teruel, O. (2019). One-Plane Glide-Symmetric Holey Structures for Stop-Band and Refraction Index Reconfiguration. Symmetry, 11(4), Article ID 495.
Open this publication in new window or tab >>One-Plane Glide-Symmetric Holey Structures for Stop-Band and Refraction Index Reconfiguration
2019 (English)In: Symmetry, ISSN 2073-8994, E-ISSN 2073-8994, Vol. 11, no 4, article id 495Article in journal (Refereed) Published
Abstract [en]

This work presents a new configuration to create glide-symmetric structures in a single plane, which facilitates fabrication and avoids alignment problems in the assembly process compared to traditional glide-symmetric structures based on several planes. The proposed structures can be printed on the metal face of a dielectric substrate, which acts as a support. The article includes a parametric study based on dispersion diagrams on the appearance of stop-bands and phase-shifting by breaking the symmetry. In addition, a procedure to regenerate symmetry is proposed that may be useful for reconfigurable devices. Finally, the measured and simulated S parameters of 10 x 10 unit-cell structures are presented to illustrate the attenuation in these stop-bands and the refractive index of the propagation modes. The attenuation obtained is greater than 30 dB in the stop-band for the symmetry-broken prototype.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
glide symmetry, single plane, stop-band, periodic structures, higher symmetries, refractive index
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-252648 (URN)10.3390/sym11040495 (DOI)000467314400054 ()2-s2.0-85065483240 (Scopus ID)
Note

QC 20190610

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-06-10Bibliographically approved
Dahlberg, O., Ghasemifard, F., Valerio, G. & Quevedo-Teruel, O. (2019). Propagation characteristics of periodic structures possessing twist and polar glide symmetries. EPJ Applied Metamaterials, 6, Article ID 14.
Open this publication in new window or tab >>Propagation characteristics of periodic structures possessing twist and polar glide symmetries
2019 (English)In: EPJ Applied Metamaterials, ISSN 2272-2394, Vol. 6, article id 14Article in journal (Refereed) Published
Abstract [en]

In this article, we provide an overview of the current state of the research in the area of twist symmetry. This symmetry is obtained by introducing multiple periods into the unit cell of a periodic structure through a rotation of consecutive periodic deformations around a symmetry axis. Attractive properties such as significantly reduced frequency dispersion and increased optical density, compared to purely periodic structures, are observed. The direct link between the symmetry order and these properties is illustrated through numerical simulations. Moreover, polar glide symmetry is introduced, and is shown to provide even further control of the dispersion properties of periodic structures, especially when combined with twist symmetry. Twist symmetries can, with benefit, be employed in the development of devices for future communication networks and space applications, where fully metallic structures with accurate control of the dispersion properties are desired.

Place, publisher, year, edition, pages
EDP Sciences, 2019
Keywords
higher symmetry, twist symmetry, polar glide symmetry, broken symmetry
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-249884 (URN)10.1051/epjam/2019012 (DOI)000462659200002 ()2-s2.0-85063736153 (Scopus ID)
Note

QC 20190426

Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-06-11Bibliographically approved
Quevedo-Teruel, O. & Craeye, C. (2019). Roadmap on metasurfaces. Journal of Optics, 21(7), Article ID 073002.
Open this publication in new window or tab >>Roadmap on metasurfaces
2019 (English)In: Journal of Optics, ISSN 2040-8978, E-ISSN 2040-8986, Vol. 21, no 7, article id 073002Article in journal (Refereed) Published
Abstract [en]

Metasurfaces are thin two-dimensional metamaterial layers that allow or inhibit the propagation of electromagnetic waves in desired directions. For example, metasurfaces have been demonstrated to produce unusual scattering properties of incident plane waves or to guide and modulate surface waves to obtain desired radiation properties. These properties have been employed, for example, to create innovative wireless receivers and transmitters. In addition, metasurfaces have recently been proposed to confine electromagnetic waves, thereby avoiding undesired leakage of energy and increasing the overall efficiency of electromagnetic instruments and devices. The main advantages of metasurfaces with respect to the existing conventional technology include their low cost, low level of absorption in comparison with bulky metamaterials, and easy integration due to their thin profile. Due to these advantages, they are promising candidates for real-world solutions to overcome the challenges posed by the next generation of transmitters and receivers of future high-rate communication systems that require highly precise and efficient antennas, sensors, active components, filters, and integrated technologies. This Roadmap is aimed at binding together the experiences of prominent researchers in the field of metasurfaces, from which explanations for the physics behind the extraordinary properties of these structures shall be provided from viewpoints of diverse theoretical backgrounds. Other goals of this endeavour are to underline the advantages and limitations of metasurfaces, as well as to lay out guidelines for their use in present and future electromagnetic devices. This Roadmap is divided into five sections: 1. Metasurface based antennas. In the last few years, metasurfaces have shown possibilities for advanced manipulations of electromagnetic waves, opening new frontiers in the design of antennas. In this section, the authors explain how metasurfaces can be employed to tailor the radiation properties of antennas, their remarkable advantages in comparison with conventional antennas, and the future challenges to be solved. 2. Optical metasurfaces. Although many of the present demonstrators operate in the microwave regime, due either to the reduced cost of manufacturing and testing or to satisfy the interest of the communications or aerospace industries, part of the potential use of metasurfaces is found in the optical regime. In this section, the authors summarize the classical applications and explain new possibilities for optical metasurfaces, such as the generation of superoscillatory fields and energy harvesters. 3. Reconfigurable and active metasurfaces. Dynamic metasurfaces are promising new platforms for 5G communications, remote sensing and radar applications. By the insertion of active elements, metasurfaces can break the fundamental limitations of passive and static systems. In this section, we have contributions that describe the challenges and potential uses of active components in metasurfaces, including new studies on non-Foster, parity-time symmetric, and non-reciprocal metasurfaces. 4. Metasurfaces with higher symmetries. Recent studies have demonstrated that the properties of metasurfaces are influenced by the symmetries of their constituent elements. Therefore, by controlling the properties of these constitutive elements and their arrangement, one can control the way in which the waves interact with the metasurface. In this section, the authors analyze the possibilities of combining more than one layer of metasurface, creating a higher symmetry, increasing the operational bandwidth of flat lenses, or producing cost-effective electromagnetic bandgaps. 5. Numerical and analytical modelling of metasurfaces. In most occasions, metasurfaces are electrically large objects, which cannot be simulated with conventional software. Modelling tools that allow the engineering of the metasurface properties to get the desired response are essential in the design of practical electromagnetic devices. This section includes the recent advances and future challenges in three groups of techniques that are broadly used to analyze and synthesize metasurfaces: circuit models, analytical solutions and computational methods.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2019
Keywords
metasurfaces, two-dimensional metamaterials, antennas, high-rate communications
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-255770 (URN)10.1088/2040-8986/ab161d (DOI)000476950700001 ()
Note

QC 20190809

Available from: 2019-08-09 Created: 2019-08-09 Last updated: 2019-08-09Bibliographically approved
Wang, L., Luis Gomez-Tornero, J. & Quevedo-Teruel, O. (2019). Substrate Integrated Waveguide Leaky-Wave Antenna With Wide Bandwidth via Prism Coupling (vol 66, pg 3110, 2018). IEEE transactions on microwave theory and techniques, 67(1), 262-262
Open this publication in new window or tab >>Substrate Integrated Waveguide Leaky-Wave Antenna With Wide Bandwidth via Prism Coupling (vol 66, pg 3110, 2018)
2019 (English)In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 67, no 1, p. 262-262Article in journal (Refereed) Published
Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-242246 (URN)10.1109/TMTT.2018.2883052 (DOI)000455450200026 ()2-s2.0-85058123881 (Scopus ID)
Note

QC 20190129

Available from: 2019-01-29 Created: 2019-01-29 Last updated: 2019-01-29Bibliographically approved
Eskandari, H., Quevedo-Teruel, O., Attari, A. R. & Majedi, M. S. (2019). Transformation optics for perfect two-dimensional non-magnetic all-mode waveguide couplers. Optical Materials Express, 9(3), 1320-1332
Open this publication in new window or tab >>Transformation optics for perfect two-dimensional non-magnetic all-mode waveguide couplers
2019 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 9, no 3, p. 1320-1332Article in journal (Refereed) Published
Abstract [en]

Here, we demonstrate that transformation optics can be used to produce 2-D non-magnetic waveguide couplers with no reflections. Our approach consists of using a scaling function for reflection suppression and introducing an auxiliary function in the transformation optics formulation to achieve a non-magnetic medium for coupling the TM polarization. To demonstrate the potential of this method, two non-magnetic waveguide couplers are designed. The first one satisfies the Brewster angle condition for any arbitrary incidence angle (TMn modes), extending the performance of couplers previously reported in the literature that only operate for TEM (TM0 mode), i.e. waves with normal incidence. Our method can be applied to match any given dielectric constant. Our results demonstrate that for a given mode (angle), we achieve a perfect match to a defined dielectric constant. The second design removes the dependence of the reflectionless condition to the incident angle at the boundary. Hence, this coupler works for all incident angles (TMn modes). It is used to compress all the modes into a region with a higher predefined refractive index.

Place, publisher, year, edition, pages
OPTICAL SOC AMER, 2019
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-247833 (URN)10.1364/OME.9.001320 (DOI)000460134500035 ()
Note

QC 20190326

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-03-26Bibliographically approved
Palomares-Caballero, A., Padilla, P., Alex-Amor, A., Valenzuela-Valdes, J. & Quevedo-Teruel, O. (2019). Twist and Glide Symmetries for Helix Antenna Design and Miniaturization. Symmetry, 11(3), Article ID 349.
Open this publication in new window or tab >>Twist and Glide Symmetries for Helix Antenna Design and Miniaturization
Show others...
2019 (English)In: Symmetry, ISSN 2073-8994, E-ISSN 2073-8994, Vol. 11, no 3, article id 349Article in journal (Refereed) Published
Abstract [en]

Here we propose the use of twist and glide symmetries to increase the equivalent refractive index in a helical guiding structure. Twist- and glide-symmetrical distributions are created with corrugations placed at both sides of a helical strip. Combined twist-and glide-symmetrical helical unit cells are studied in terms of their constituent parameters. The increase of the propagation constant is mainly controlled by the length of the corrugations. In our proposed helix antenna, twist and glide symmetry cells are used to reduce significantly the operational frequency compared with conventional helix antenna. Equivalently, for a given frequency of operation, the dimensions of helix are reduced with the use of higher symmetries. The theoretical results obtained for our proposed helical structure based on higher symmetries show a reduction of 42.2% in the antenna size maintaining a similar antenna performance when compared to conventional helix antennas.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
higher symmetries, periodic structures, glide symmetry, twist symmetry, dispersion diagram, microwave printed circuits, helix antennas
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-251355 (URN)10.3390/sym11030349 (DOI)000464390500006 ()
Note

QC 20190521

Available from: 2019-05-21 Created: 2019-05-21 Last updated: 2019-05-21Bibliographically approved
Ebrahimpouri, M. & Quevedo-Teruel, O. (2018). A bespoke lens for a slot log-spiral excitation. In: IET Conference Publications: . Paper presented at 12th European Conference on Antennas and Propagation, EuCAP 2018, 9 April 2018 through 13 April 2018. Institution of Engineering and Technology (CP741)
Open this publication in new window or tab >>A bespoke lens for a slot log-spiral excitation
2018 (English)In: IET Conference Publications, Institution of Engineering and Technology , 2018, no CP741Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, a bespoke lens has been designed for a slot log-spiral excitation. The performance of this lens is compared with a conventional hyper-hemispherical lens. Using the bespoke lens methodology, the specific electromagnetic properties of the slot log-spiral excitation are obtained and its phase fronts are transformed to flat phase fronts by a QCTO (quasi-conformal transformation optics) technique. The performance of the lenses is evaluated with the radiation properties. The bespoke lens produces an improvement in terms of directivity and side lobe levels.

Place, publisher, year, edition, pages
Institution of Engineering and Technology, 2018
Keywords
Bespoke lens, Lens antenna, Log-spiral, QCTO, Transformation optics, Conformal mapping, Electric excitation, Spiral antennas, Conformal transformation, Electromagnetic properties, Hemispherical lens, Radiation properties, Sidelobe levels, Lens antennas
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-247464 (URN)000400922600014 ()2-s2.0-85057320447 (Scopus ID)
Conference
12th European Conference on Antennas and Propagation, EuCAP 2018, 9 April 2018 through 13 April 2018
Note

QC20190408

Available from: 2019-04-08 Created: 2019-04-08 Last updated: 2019-04-08Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-4900-4788

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