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Quevedo-Teruel, Oscarorcid.org/0000-0002-4900-4788
##### Publications (10 of 76) Show all publications
Björkqvist, O., Dahlberg, O. & Quevedo-Teruel, O. (2019). Additive Manufactured Three Dimensional Luneburg Lens for Satellite Communications. In: 13th European Conference on Antennas and Propagation, EuCAP 2019: . Paper presented at 13th European Conference on Antennas and Propagation (EuCAP), MAR 31-APR 05, 2019, Krakow, Poland. Institute of Electrical and Electronics Engineers (IEEE), Article ID 8739803.
Open this publication in new window or tab >>Additive Manufactured Three Dimensional Luneburg Lens for Satellite Communications
2019 (English)In: 13th European Conference on Antennas and Propagation, EuCAP 2019, Institute of Electrical and Electronics Engineers (IEEE), 2019, article id 8739803Conference paper, Published paper (Refereed)
##### Abstract [en]

A method for designing gradient refractive index (GRIN) lenses with additive manufacturing or 3D-printing at K-u band is presented. To demonstrate the potential of the method, we designed a Luneburg lens using a single low-loss dielectric material available for 3D-printers. The gradient index is realized by varying the local material fill density of the lens. We demonstrate with full wave simulations that the structure is able to transform a spherical electromagnetic wave to a plane wave. When the lens is fed with a rectangular waveguide, the overall antenna has a gain of 23 dBi with side lobe levels of -12.5 dB in K-u band. This lens, when integrated with a circular polarized feeding system, could find application for ground satellite communications.

##### Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
##### Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
##### National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
##### Identifiers
urn:nbn:se:kth:diva-257470 (URN)000480384701130 ()2-s2.0-85068445817 (Scopus ID)978-8-8907-0188-7 (ISBN)
##### Conference
13th European Conference on Antennas and Propagation (EuCAP), MAR 31-APR 05, 2019, Krakow, Poland
Available from: 2019-09-05 Created: 2019-09-05 Last updated: 2019-09-05Bibliographically approved
Shanei, M. M., Fathi, D., Ghasemifard, F. & Quevedo-Teruel, O. (2019). All-silicon reconfigurable metasurfaces for multifunction and tunable performance at optical frequencies based on glide symmetry. Scientific Reports, 9, Article ID 13641.
Open this publication in new window or tab >>All-silicon reconfigurable metasurfaces for multifunction and tunable performance at optical frequencies based on glide symmetry
2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 13641Article in journal (Refereed) Published
##### Abstract [en]

Dielectric metasurfaces have opened promising possibilities to enable a versatile platform in the miniaturization of optical elements at visible and infrared frequencies. Due to high efficiency and compatibility with CMOS fabrication technology, silicon-based metasurfaces have a remarkable potential for a wide variety of optical devices. Adding tunability mechanisms to metasurfaces could be beneficial for their application in areas such as communications, imaging and sensing. In this paper, we propose an all-silicon reconfigurable metasurface based on the concept of glide symmetry. The reconfigurability is achieved by a phase modulation of the transmitted wave activated by a lateral displacement of the layers. The misalignment between the layers creates a new inner periodicity which leads to the formation of a metamolecule with a new sort of near-field interaction. The proposed approach is highly versatile for developing multifunctional and tunable metadevices at optical frequencies. As a proof of concept, in this paper, we design a bifunctional metadevice, as well as a tunable lens and a controllable beam deflector operating at 1.55 mu m.

##### Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP, 2019
##### National Category
Electrical Engineering, Electronic Engineering, Information Engineering
##### Research subject
Electrical Engineering
##### Identifiers
urn:nbn:se:kth:diva-261952 (URN)10.1038/s41598-019-49395-4 (DOI)000487002100036 ()31541128 (PubMedID)2-s2.0-85072522293 (Scopus ID)
##### Note

QC 20191014

Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-12-03Bibliographically approved
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
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
Eskandari, H., Quevedo-Teruel, O., Attari, A. R. & Majedi, M. S. (2019). Design of Nonmagnetic All-mode Waveguide Coupler with Perfect Transmission Using Transformation Optics. In: 13th European Conference on Antennas and Propagation, EuCAP 2019: . Paper presented at 13th European Conference on Antennas and Propagation, EuCAP 2019; Krakow; Poland; 31 March 2019 through 5 April 2019. Institute of Electrical and Electronics Engineers (IEEE), Article ID 8739511.
Open this publication in new window or tab >>Design of Nonmagnetic All-mode Waveguide Coupler with Perfect Transmission Using Transformation Optics
2019 (English)In: 13th European Conference on Antennas and Propagation, EuCAP 2019, Institute of Electrical and Electronics Engineers (IEEE), 2019, article id 8739511Conference paper, Published paper (Refereed)
##### Abstract [en]

Using the transformation optics method together with the basic properties of Maxwell equations, a compact nonmagnetic waveguide coupler is designed that can ideally couple all TMn modes. Two compression functions are proposed to provide a perfect smooth transition between the waveguides. This coupler can be used to guide and compress a vacuumfilled waveguide to a smaller waveguide with a predefined higher dielectric constant inside. The design method is validated by simulated examples using COMSOL Multiphysics.

##### Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
##### Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
##### Keywords
transformation optics, waveguide coupler, non-magnetic media
##### National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
##### Identifiers
urn:nbn:se:kth:diva-257473 (URN)000480384700210 ()2-s2.0-85068469516 (Scopus ID)978-8-8907-0188-7 (ISBN)
##### Conference
13th European Conference on Antennas and Propagation, EuCAP 2019; Krakow; Poland; 31 March 2019 through 5 April 2019
##### Note

QC 20190904

Available from: 2019-09-04 Created: 2019-09-04 Last updated: 2019-09-04Bibliographically 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.

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
Padilla, P., Palomares-Caballero, A., Alex-Amor, A., Valenzuela-Valdes, J. F. & Quevedo-Teruel, O. (2019). Glide-symmetric printed corrugated transmission lines with controlable stopband. In: 13th European Conference on Antennas and Propagation, EuCAP 2019: . Paper presented at 13th European Conference on Antennas and Propagation, EuCAP 2019; Krakow; Poland; 31 March 2019 through 5 April 2019. Institute of Electrical and Electronics Engineers (IEEE), Article ID 8739817.
Open this publication in new window or tab >>Glide-symmetric printed corrugated transmission lines with controlable stopband
2019 (English)In: 13th European Conference on Antennas and Propagation, EuCAP 2019, Institute of Electrical and Electronics Engineers (IEEE), 2019, article id 8739817Conference paper, Published paper (Refereed)
##### Abstract [en]

Here, we demonstrate that the dispersion properties of printed lines can be controlled by using glide symmetry. Glide symmetry is introduced by means of corrugations in the printed lines. The glide-symmetric configuration provides a more linear propagation constant, avoiding the presence of stopband between first and second propagating modes. Additionally, the breakage of the glide-symmetric geometry introduces a tunable stopband that can be used for filtering.

##### Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
##### Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
##### Keywords
glide symmetry, periodic structures, higher symmetries, microstrip line, double-sided parallel-strip line, planar technology, printed transmission lines
##### National Category
Communication Systems
##### Identifiers
urn:nbn:se:kth:diva-257478 (URN)000480384701144 ()2-s2.0-85068476187 (Scopus ID)978-8-8907-0188-7 (ISBN)
##### Conference
13th European Conference on Antennas and Propagation, EuCAP 2019; Krakow; Poland; 31 March 2019 through 5 April 2019
##### Note

QC 20190902

Available from: 2019-09-02 Created: 2019-09-02 Last updated: 2019-09-02Bibliographically approved
Brazalez, A. A., Manhohni, L., Johansson, M., Mattsson, M. & Quevedo-Teruel, O. (2019). Implementation of a compact Ka-band parallel plate Luneburg lens based on a hybrid dielectric/metasurface unit cell. In: 13th European Conference on Antennas and Propagation, EuCAP 2019: . Paper presented at 13th European Conference on Antennas and Propagation, EuCAP 2019; Krakow; Poland; 31 March 2019 through 5 April 2019. IEEE, Article ID 8740306.
Open this publication in new window or tab >>Implementation of a compact Ka-band parallel plate Luneburg lens based on a hybrid dielectric/metasurface unit cell
2019 (English)In: 13th European Conference on Antennas and Propagation, EuCAP 2019, IEEE, 2019, article id 8740306Conference paper, Published paper (Refereed)
##### Abstract [en]

The complete implementation and numerical validation of a compact cost-effective multiport parallel plate Luneburg lens antenna operating at 28 GHz is described in this paper. The lens design consists of two parallel plates separated by a gap where each of them contains a metasurface structure based on a new type of combined dielectric/holey unit cell periodically arranged in a glide-symmetric configuration. The required refractive index is achieved by a combination of coarse control by adding a dielectric in the gap, and fine tuning by changing the height of the holes. The simulations of the final prototype including a flare to ensure a smooth wave transition from the parallel plate configuration to air, as well as a coaxial-to-waveguide-to-parallel plate feeding, show a 20% bandwidth for 11.5 dB return loss, and the crosstalk remains below -15 dB for the same frequency band.

IEEE, 2019
##### Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
##### Keywords
glide symmetry, Luneburg lens, metasurface, parallel plate, transition, unit cell
##### National Category
Communication Systems
##### Identifiers
urn:nbn:se:kth:diva-257471 (URN)000480384703161 ()2-s2.0-85068475035 (Scopus ID)978-8-8907-0188-7 (ISBN)
##### Conference
13th European Conference on Antennas and Propagation, EuCAP 2019; Krakow; Poland; 31 March 2019 through 5 April 2019
##### Note

QC 20190902

Available from: 2019-09-02 Created: 2019-09-02 Last updated: 2019-09-02Bibliographically approved
Liao, Q., Rajo-Iglesias, E. & Quevedo-Teruel, O. (2019). Ka-Band Fully Metallic TE40 Slot Array Antenna With Glide-Symmetric Gap Waveguide Technology. IEEE Transactions on Antennas and Propagation, 67(10), 6410-6418
Open this publication in new window or tab >>Ka-Band Fully Metallic TE40 Slot Array Antenna With Glide-Symmetric Gap Waveguide Technology
2019 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 67, no 10, p. 6410-6418Article in journal (Refereed) Published
##### Abstract [en]

Gap waveguide has recently been proposed as a low-loss and low-cost technology for millimeter-wave components. The main advantage of the gap waveguide technology is that the microwave components can be manufactured in two metallic pieces that are assembled together without electrical contact. The leakage through a thin air gap between the two pieces is prevented by a 2-D periodic structure offering an electromagnetic bandgap (EBG). This EBG is conventionally implemented with metallic pins. Here, we propose the usage of a holey glide-symmetric EBG structure to design a $4\times 4$ slot array antenna that is fed with a TE40 mode. The TE40 excitation is designed based on a TE10-TE20 mode converter whose performance is initially evaluated by radiation pattern measurements. The final antenna, the $4\times 4$ slot array antenna, was manufactured in aluminum by computer numerical control (CNC) milling. The antenna has a rotationally symmetric radiation pattern that could find application as a reference antenna as well as for 5G point-to-point communications.

##### Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
##### Keywords
5G, fully metallic antenna, gap waveguide technology, glide symmetry, higher modes, Ka-band, millimeter waves, slot array, TE40 mode
##### National Category
Telecommunications
##### Identifiers
urn:nbn:se:kth:diva-263667 (URN)10.1109/TAP.2019.2922829 (DOI)000492335100019 ()2-s2.0-85068143643 (Scopus ID)
##### Note

QC 20191108

Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-12-20Bibliographically approved
Dahlberg, O., Pucci, E., Wang, L. & Quevedo-Teruel, O. (2019). Low-Dispersive Glide-Symmetric Leaky-Wave Antenna at 60 GHz. In: 13th European Conference on Antennas and Propagation, EuCAP 2019: . Paper presented at 13th European Conference on Antennas and Propagation, EuCAP 2019; Krakow; Poland; 31 March 2019 through 5 April 2019. IEEE, Article ID 8740212.
Open this publication in new window or tab >>Low-Dispersive Glide-Symmetric Leaky-Wave Antenna at 60 GHz
2019 (English)In: 13th European Conference on Antennas and Propagation, EuCAP 2019, IEEE, 2019, article id 8740212Conference paper, Published paper (Refereed)
##### Abstract [en]

In this work we demonstrate a method for producing low-loss, non-squinting, directive leaky-wave antennas (LWAs) for millimeter-wave frequencies. The scanning behaviour of the radiation pattern arises from the dispersive nature of the waveguide mode, which is leaking out when opening the wave guiding structure. We propose a method to cancel the dispersive behaviour, by allowing the leaked waves to refract in a dispersive prism-lens. The proposed method allows for fully metallic implementation of the antenna, resulting in low losses. Furthermore, high directivity is easily achieved with a simple feeding. The corresponding theory is outlined, and the proposed method is used to design an antenna operating at 60 GHz. The obtained bandwidth, with less than 1 degrees beam scanning, is 20% in simulations and the realized gain of the antenna is 17 dB across the entire bandwidth. The design is proposed as an alternative to obtain high gain antennas for 5G applications, in which low losses and narrow beams are expected to be key features for mm-waves.

IEEE, 2019
##### Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
##### Keywords
Leaky-wave antenna, reduced beam-squint, 5G, base station antenna, millimeter-wave
##### National Category
Communication Systems
##### Identifiers
urn:nbn:se:kth:diva-257472 (URN)000480384703067 ()2-s2.0-85068068008 (Scopus ID)978-8-8907-0188-7 (ISBN)
##### Conference
13th European Conference on Antennas and Propagation, EuCAP 2019; Krakow; Poland; 31 March 2019 through 5 April 2019
##### Note

QC 20190902

Available from: 2019-09-02 Created: 2019-09-02 Last updated: 2019-09-02Bibliographically approved
##### Identifiers
ORCID iD: orcid.org/0000-0002-4900-4788

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