Transparent dual band Wi‐Fi filter for double glazed energy saving window as a smart network

Abstract

A transparent advanced electromagnetic structure is designed to be used in real‐world Wi‐Fi shielding applications. Concentric square loops as frequency selective surfaces (FSSs) are analytically presented with the Pyrex glass substrate based on the equivalent electric circuit model. The designed FSS window suppresses signals at both 2.5 and 5 GHz bands, and reflects back to the indoor medium. Visible light transmittance of the studied window is achieved as 87%. Accordingly, other electromagnetic communication links can transfer through the designed filter such as cell phone, and radio. The dependency of the proposed window to polarization and angular variations is examined numerically, which shows stable frequency response at 2.5 GHz and an acceptable one for 5 GHz. As a figure of merit, the proposed structure is a double glazed window with potential application for smart, secure, and energy‐saving buildings. Also, practical considerations regarding the deployment of FSS on window glass and the separation distance between the glass layers have been investigated. A prototype of the proposed design is fabricated and measured that a good agreement between measurement and simulation is demonstrated. Therefore, parametric circuit model analysis, deployment of transparent substrate, thin metallic parts on one layer, secure indoor communications, and energy‐saving are some of the advantages of the proposed window.

A dual‐band complementary frequency selective surface combining structures that provides narrow and wide stop‐band frequency responses

“…The measured results show that the bandwidth does not suffer degradation for different incidence angles, confirming the angular stability and polarization independence. Table 1 compares the proposed FSS with other works found in literature, [2][3][4][5][6][14][15][16][17] considering the aspects of a profile, angular stability, polarization independence, and bandwidth of rejection bands. As seen in Table 1, our proposed CFSS has a low profile, angular stability of up to 45°, polarization independence, a narrow band of around 2.56 GHz (210 MHz), and a wide band of around 5.17 GHz (1710 MHz).…”

“…An angular stability for vertical and horizontal polarizations is achieved, but the geometry is a little bit complex. In Pakdin et al, 6 a transparent advanced electromagnetic structure was designed to be used in Wi‐Fi shielding applications, at 2.5 and 5.0 GHz. The structure has one layer but booth bands are narrow.…”

Design of a Transparent System for Mutual Coupling Reduction of Microstrip Array Antennas with Confined Water

“…Mutual coupling between two elements is minimized using this process, which involves inserting a liquid dielectric (distilled water) between the elements of an antenna array. Looking forward, the proposed technique's ability to suppress mutual coupling is encouraging for applications such as combining solar panels and energy harvesting with EM structures, [ 24,25 ] transparent electromagnetic structures, [ 26 ] and low RCS devices. [ 27–29 ] The following are the main characteristics of this device, which apply to both aerial and naval applications.…”

“…combining solar panels and energy harvesting with EM structures, [24,25] transparent electromagnetic structures, [26] and low RCS devices. [27][28][29] The following are the main characteristics of this device, which apply to both aerial and naval applications.…”

Orbital angular momentum wave generation/detection based on planar multi‐slot‐spiral circularly polarized antenna

“…It is an interesting field of research to introduce new concepts of EM engineering, such as transparent spatial Wi-Fi filter, 14 multifunctional device, 15 optical antenna, 16 scattering engineering, 17,18 and hence forth. Here, a new concept of OAM wave in optic region is extended to microwave frequencies.…”