Wide band-pass FSS with reduced periodicity for energy efficient windows at higher frequencies
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Wide band‑pass FSS with reduced periodicity for energy efficient windows at higher frequencies Jeremy Fleury1 · Matteo Lanini2 · Claudio Pose2,3 · Luc Burnier1 · Andrea Salvadè2 · Erich Zimmermann4 · Carine Genoud4 · Andreas Schüler1 Received: 12 November 2019 / Accepted: 13 April 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A simulation model and an experimental characterization of energy saving glazing transparent to mobile communication frequency up to 40 GHz is presented. A previous study showed that laser structured energy efficient windows with a frequency selective surface greatly reduces the microwave attenuation for frequencies below 5 GHz, while preserving the thermal insulation properties of the window. In this study, the focus is laid upon higher frequency range (26–40 GHz), considering the rapid evolution of the carrier frequencies. Several energy efficient windows were built and laser scribed with a cell periodicity down to 0.5 mm. A computational model based on electric equivalent circuit behavior and transfer matrix representation is shown, and compared to a real set of measurements taken from the manufactured glazing. The simulated data strongly fit the measurements taken for five different windows, and, additionally, it allows to infer parameters of a real double-glazing that may be difficult to measure directly. To the best of our knowledge, this is the first time energy efficient windows are produced with these characteristics, measured and simulated at high frequency range. Keywords Energy efficient glazing · Frequency selective surfaces · Mobile communications · Fabry–Pérot cavity
1 Introduction The demand for mobile communication between persons and between objects (Internet of Things, IoT) is continuously and rapidly increasing. In order to satisfy these needs, higher frequency range in the order of 3.5 to 40 GHz are being allocated for telecommunication [6] which allows for larger bandwidth, higher data rates, lower latency and
increased capacity on the network [11]. At the same time, the standards for energy efficient buildings require the use of double or triple glazing with one or two low emissivity (low-e) coatings which allows for better thermal insulation. These low-e coatings are composed of multiple oxides and silver thin films. While being highly transparent in the visible light, they induce a strong reflectivity for shorter wavelength in the middle and near infrared spectrum. On the one
* Jeremy Fleury [email protected]
Andreas Schüler [email protected]
Matteo Lanini [email protected]
1
Solar Energy and Building Physics Laboratory, (LESO‑PB), École Polytechnique Fédérale de Lausanne (EPFL), Station 18, 1015 Lausanne, Switzerland
2
Institute for Systems and Applied Electronics (ISEA), University of Applied Sciences of Southern Switzerland (SUPSI), Galleria 2, 6928 Manno, Switzerland
3
Grupo de Procesamiento de Señales, Identificación y Control, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850,
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