Publications associées à Lens antenna

Microwave Metalens Antennas

Recently, there has been growing interest in the use of metamaterial (MTM)-based lenses, also known as metalenses, as innovative antenna technology. Increasingly widespread applications of metalenses in modern microwave communication and sensing systems ha ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2023

Locating Transient Directional Sources in Free Space Based on the Electromagnetic Time Reversal Technique

Farhad Rachidi-Haeri, Marcos Rubinstein, Qi Li

Traditional location methods such as time of arrival and direction of arrival have been widely used to locate transient radiation sources. However, these approaches neglect the directional radiation pattern of the sources. Locating directional sources is a ...

2020

Subarray antenna fed by analog beamforming network for 5G picocell applications

Anja Skrivervik

In this paper a subarray fed by an analog beamforming network for 5G picocell applications is proposed. Design requirements are presented taking into account frequency band operation, bandwidth, radiation pattern shape and both, antenna element and transmi ...

IEEE2020

Patch Antenna System for CubeSats in L band

Anja Skrivervik, Miroslav Veljovic

An L-band patch-antenna system for CubeSat applications is presented in this paper. The high-permittivity dielectric loading reduces the size of individual antennas to make them suitable for a CubeSat platform. Two circularly polarized patch antennas were ...

The European Association on Antennas and Propagation (EurAAP)2019

Broadbeam microstrip patch antenna using higher order modes

Anja Skrivervik, Ismael Vico Triviño

The aim of this contribution is to assess the potential of using various microstrip radiating elements excited with different modes to achieve wide pattern beamwidths. The proposed antenna is made in classic microstrip technology and consists of a circular ...

The European Association on Antennas and Propagation (EurAAP)2019

Gain enhancement of circular waveguide antennas using near-zero index metamaterials

Kosmas Tsakmakidis, Ershad Mohammadi, Foziyeh Sohrabi

In this article, a rigorous analytical methodology is introduced for designing near-zero refractive index metamaterials (NZIMs). Our proposed NZIM media is realized by three stacked layers of perforated metallic surfaces, each layer composed of a fishnet-l ...

WILEY2019

Optically isolated millimeter-wave detector for the Toroidal Plasma Experiment

Timothy Goodman, Stefano Alberti, Anja Skrivervik, Ivo Furno, Marcelo Baquero Ruiz, Oulfa Chellaï, Gennady Plyushchev, Fabian Manke

We have designed and built an optically isolated millimeter-wave detection system to prevent interference from a nearby, powerful, 2.45 GHz microwave source in millimeter-wave propagation experiments in the TORoroidal Plasma EXperiment (TORPEX). A series o ...

2018

Wideband H-plane dielectric horn antenna

Juan Ramon Mosig, Lei Wang, Maria Garcia Vigueras, Marcos Alvarez Folgueiras

By flaring a dielectric waveguide in the H-plane, an H-plane dielectric horn is formed, which could be directly excited by an SIW feed. However, matching and radiation performances are poor due to the thinness of the substrate. To improve these performance ...

Inst Engineering Technology-Iet2017

Antennas for low-cost Ka-band ground terminal devices

Joana Rita Alves dos Santos Silva

The ever-growing demand for high-speed data links together with the increasing congestion in the traditional microwave spectrum are pushing for the exploitation of higher microwave and millimeter-wave (mm-wave) frequencies, including the so-called Ka band. ...

EPFL2017

In-Plane Plasmonic Antenna Arrays with Surface Nanogaps for Giant Fluorescence Enhancement

Jürgen Brugger, Duncan Thomas Lindsay Alexander, Valentin Flauraud, Pamina Winkler, Raju Regmi

Optical nanoantennas have a great potential for enhancing light-matter interactions at the nanometer scale, yet fabrication accuracy and lack of scalability currently limit ultimate antenna performance and applications. In most designs, the region of maxim ...

American Chemical Society (ACS)2017

Linear and non-linear studies of spurious backward-wave instabilities in a smooth-wall gyrotron beam duct

Stefano Alberti, Jérémy Genoud, Trach-Minh Tran

Recently developed self-consistent models for beam-wave interaction simulations of a gyrotron oscillator are used to study spurious backward-wave instabilities in smooth-wall metallic beam ducts. Starting from a simple case with a basic geometry, the influ ...

2017

Design and Measurement of a Differential Printed Antenna for a Wireless Sensor Network Node

Anja Skrivervik, Nuno Miguel Faria Pires

This letter presents the design and measurement of an antenna integrated into an agricultural sensor network node operating on the 2.4-GHz ISM band using the ZigBee protocol stack. The novel structure, coined bowtie-shaped folded dipole (BSFD), has a diffe ...

Ieee-Inst Electrical Electronics Engineers Inc2017

High Gaussicity feedhorns for sub- / millimeter wave applications

In feedhorn design, the power coupling to the fundamental free-space LG(00) mode, or Gaussicity, is a good proxy for high performance, particularly the sidelobe and cross-polar levels and the near-field behavior. Gaussicity can be maximized by ensuring tha ...

Ieee2016

Lens-based Ka-band antenna system using planar feed

Juan Ramon Mosig, Marc Esquius Morote, Maria Garcia Vigueras, Joana Rita Alves dos Santos Silva

This paper presents a simple, low-cost and compact mobile ground terminal antenna for Ka-band satellite communications that operates in the downlink band (19.7-20.2 GHz). The antenna is composed of a shaped dielectric lens which tilts in front of a planar ...

2015

A Planar Feed for SOTM Ka-band Lens Antennas

Juan Ramon Mosig, Marc Esquius Morote, Maria Garcia Vigueras, Joana Rita Alves dos Santos Silva

Ka-band satellite technology has been drawing growing interest from public transportation industry to military applications, due to its advantages of higher speed links, smaller terminals and reduced costs. These well-recognized characteristics have also b ...

2015

Performance of UHF W-BAN antennas in a real environment scenario

Anja Skrivervik, Jean-François Zürcher, Jovanche Trajkovikj

This work presents performance of robust wearable antennas intended to operate in Wireless Body Area Networks (W-BAN) in UHF, TETRAPOL communication band, 380-400 MHz. We propose a Planar Inverted F Antenna (PIFA) as reliable antenna type for UHF W-BAN app ...

2014

Spatially Dispersive Graphene Single and Parallel Plate Waveguides: Analysis and Circuit Model

Julien Perruisseau-Carrier, Juan Sebastian Gomez Diaz

The propagation of surface waves along spatially dispersive graphene-based 2-D waveguides is investigated in detail. Graphene is characterized using a full-k(rho) conductivity model under the relaxation-time approximation, which allows to obtain analytical ...

Institute of Electrical and Electronics Engineers2013

Multipactor saturation in parallel-plate waveguides

Michael Mattes, Francisco Edén Sorolla Rosario

The saturation stage of a multipactor discharge is considered of interest, since it can guide towards a criterion to assess the multipactor onset. The electron cloud under multipactor regime within a parallel-plate waveguide is modeled by a thin continuous ...

2012

In-plane illuminated metallic annular aperture array for sensing application

Hans Peter Herzig, Qing Tan, Armando Cosentino

We propose here an application to sensing of annular aperture arrays (AAA). We theoretically investigate the optical properties of the reflective AAA device when illuminated in-plane. The cavity presents almost perfect absorption due to the waveguide mode ...

Optical Society of America2012

A 6.5 - 50 GHz battery-powered compact rotary joint for polarization ellipticity measurements

Jean-François Zürcher

A simple, efficient, and compact rotary joint has been designed, realized, and measured. It has been used intensively to perform polarization ellipticity measurements on various circularly polarized antennas (e.g., helical antennas and circularly polarized ...

Wiley-Blackwell2011