Switchable Electromagnetic Shield Based on Seawater

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shen-Yun Wang ◽  
Ke-Feng Sheng ◽  
Bing-Xiang Li
Keyword(s):  
Free Space ◽  
Multilayer Structure ◽  
Signal Transmission ◽  
Microwave Energy ◽  
Wave Signal ◽  
Key Indicator ◽  
Full Wave ◽  
Communication Signal ◽  
Electromagnetic Shield ◽  
Good Agreement

Abstract In this paper, we propose a concept of switchable electromagnetic shield based on seawater. The shield is designed to be a multilayer structure consisting of one chamber layer filled with free space or seawater and three dielectric layers to match with the communication wave signal. At low-power signal for communication purpose, the shield with the chamber layer filled with free space can make the wave signal transparently propagate through. At high-power interference microwave signal impinging onto the shield, the structure with the chamber layer filled with seawater can reflect and absorb the microwave energy. Transparency state for communication signal is designed based on the theory of transmission line, where a key indicator for communication signal transmission is the input impedance of the shield. Shielding state is theoretically calculated under different seawater parameters in a wide frequency band. Both the transparency and shielding states are validated by full-wave numerical calculations, and the results are in good agreement.

An investigation of 16-QAM signal transmission over turbulent RoFSO link modeled by gamma–gamma distribution

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Abhishek Tripathi ◽  
Shilpi Gupta ◽  
Abhilash Mandloi ◽  
Gireesh G Soni
Keyword(s):  
Gamma Distribution ◽  
Free Space ◽  
Signal Transmission ◽  
Channel Modeling ◽  
Symbol Error Rate ◽  
Average Error ◽  
60 Ghz ◽  
Free Space Optical ◽  
Error Vector Magnitude ◽  
Space Optical Communication

AbstractThis paper outlines the performance of a 10 Gbit/s rectangular 16-quadrature amplitude modulation–based radio over free space optical communication system. Here, 60 GHz radio frequency–modulated signal is propagated through a 1550-nm free space optical link. The gamma–gamma distribution is used for the channel modeling of weak to strong atmospheric turbulence. The reported constellation plots and eye patterns are attributed to impairment factors in adverse conditions of atmosphere. The evaluation is carried out that the variation in average error vector magnitude in the range of 1.45–1.63% and equivalent symbol error rate of 0.019–0.023 are obtained for a clear atmosphere compared to the turbulent link of 0.2–1 km, respectively.

scholarly journals Characterization of Tiled Architecture for C-Band 1-Bit Beam-Steering Transmitarray

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1259
Author(s):  
Dmitry Kozlov ◽  
Irina Munina ◽  
Pavel Turalchuk ◽  
Vitalii Kirillov ◽  
Alexey Shitvov ◽  
...  
Keyword(s):  
Communication Systems ◽  
Beam Steering ◽  
Unit Cell ◽  
Electromagnetic Simulations ◽  
Fifth Generation ◽  
Full Wave ◽  
Array Architecture ◽  
Modulation Pattern ◽  
Good Agreement

A new implementation of a beam-steering transmitarray is proposed based on the tiled array architecture. Each pixel of the transmitarray is manufactured as a standalone unit which can be hard-wired for specific transmission characteristics. A set of complementary units, providing reciprocal phase-shifts, can be assembled in a prescribed spatial phase-modulation pattern to perform beam steering and beam forming in a broad spatial range. A compact circuit model of the tiled unit cell is proposed and characterized with full-wave electromagnetic simulations. Waveguide measurements of a prototype unit cell have been carried out. A design example of a tiled 10 × 10-element 1-bit beam-steering transmitarray is presented and its performance benchmarked against the conventional single-panel, i.e., unibody, counterpart. Prototypes of the tiled and single-panel C-band transmitarrays have been fabricated and tested, demonstrating their close performance, good agreement with simulations and a weak effect of fabrication tolerances. The proposed transmitarray antenna configuration has great potential for fifth-generation (5G) communication systems.

Experimental demonstration of the full-wave iterative compensation in free space optical communications

2013 ◽  
Vol 38 (13) ◽  
pp. 2367 ◽  
Author(s):  
Rudolph Biérent ◽  
Marie-Thérèse Velluet ◽  
Nicolas Védrenne ◽  
Vincent Michau
Keyword(s):  
Optical Communications ◽  
Free Space ◽  
Experimental Demonstration ◽  
Free Space Optical ◽  
Full Wave

scholarly journals A full wave description for thin wire structures with TLST and perturbation theory

2018 ◽  
Vol 16 ◽  
pp. 123-133
Author(s):  
Fabian Ossevorth ◽  
Ralf T. Jacobs ◽  
Hans Georg Krauthäuser
Keyword(s):  
Perturbation Theory ◽  
Closed Form ◽  
Current Distribution ◽  
Perturbation Approach ◽  
Mixed Potential ◽  
Thin Wire ◽  
Method Of Moment ◽  
Initial Current ◽  
Full Wave ◽  
Good Agreement

Abstract. A full wave description of a thin wire structure, that includes mutual interactions and radiation, can be obtained in closed form with the so-called Transmission Line Super Theory or a refined variant of this method that utilises perturbation theory. In either procedure, a set of mixed potential integral equations is solved for the currents that propagate along a wire. With the perturbation approach, no iteration is required to approximate the initial current distribution on the wire. This procedure will be applied to solve multi-wire problems. The theory will be derived and computed results will be shown to be in good agreement with method of moment computations.

scholarly journals Plane Wave Coupling to a Transmission Line Above Ground with Terminating Loads

2019 ◽  
Vol 8 (1) ◽  
pp. 82-90
Author(s):  
L. K. Warne ◽  
S. Campione ◽  
R. S. Coats
Keyword(s):  
Plane Wave ◽  
Transmission Line ◽  
Radiation Effects ◽  
Short Circuit ◽  
Open Circuit ◽  
Simple Circuit ◽  
Transmission Line Model ◽  
Wave Coupling ◽  
Full Wave ◽  
Good Agreement

This paper considers plane wave coupling to a transmission line consisting of an aerial wire above a conducting ground. Simple circuit models are constructed for the terminating impedances at the ends of the line including radiation effects. We consider the following load topologies: open circuit, short circuit, and grounded rods. Results from the transmission line model with these loads show good agreement with full-wave simulations.  

3D Electromagnetic Modeling of Through Silicon Vias and Interposers in Electronic Packaging

2012 ◽  
Vol 2012 (1) ◽  
pp. 001057-001067
Author(s):  
Darryl Kostka ◽  
Antonio Ciccomancini Scogna
Keyword(s):  
High Speed ◽  
Signal Transmission ◽  
Form Factors ◽  
Point Of View ◽  
Electromagnetic Modeling ◽  
Electromagnetic Simulations ◽  
Full Wave ◽  
3D Ics ◽  
Silicon Vias ◽  
Delivery Networks

3D ICs promise “more than Moore” integration by packing a lot of functionality into small form factors. Interposers along with TSVs play an important role in 3D integration from an electrical, thermal and mechanical point of view. The goal of this paper is to electrically model TSVs and 3D interposers by means of three 3D full wave electromagnetic simulations. A comparative analysis of various configurations of signal delivery networks in 3D interposers for high speed signal transmission is presented.

scholarly journals A New Ultracompact Narrow Bandpass Microstrip Filter Using Double-Negative Quasiplanar Cells

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Mohammad Reza Khawary ◽  
Vahid Nayyeri ◽  
Seyed Mohammad Hashemi ◽  
Mohammad Soleimani
Keyword(s):  
Printed Circuit Board ◽  
High Selectivity ◽  
Bandpass Filter ◽  
Circuit Board ◽  
Center Frequency ◽  
Double Negative ◽  
Fractional Bandwidth ◽  
Printed Circuit ◽  
Full Wave ◽  
Good Agreement

This paper presents a novel ultracompact narrow bandpass filter with high selectivity. The proposed filter is composed of cascading two basic cells. Each cell is basically a microstrip line loaded with a quasiplanar resonator and series gaps which can be fabricated using a standard multilayer printed circuit board technology. The structure is analyzed through an equivalent circuit and full-wave simulations. The simulation results are compared with experimental measurements demonstrating a good agreement between them. The measurement indicates that the realized bandpass filter at the center frequency of 1 GHz has a fractional bandwidth of 2.2%. Most importantly, in comparison with other similar recent works, it is shown that the proposed filter has the smallest size.

scholarly journals Analytical Modeling of Metamaterial Differential Transmission Line Using Corrugated Ground Planes in High-Speed Printed Circuit Boards

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 299 ◽  
Author(s):  
Myunghoi Kim
Keyword(s):  
Analytical Model ◽  
High Speed ◽  
Printed Circuit Boards ◽  
Signal Transmission ◽  
Circuit Boards ◽  
Transmission Characteristics ◽  
Differential Signal ◽  
Printed Circuit ◽  
Full Wave ◽  
Differential Transmission

An analytical model for metamaterial differential transmission lines (MTM-DTLs) with a corrugated ground-plane electromagnetic bandgap (CGP-EBG) structure in high-speed printed circuit boards is proposed. The proposed model aims to efficiently and accurately predict the suppression of common-mode noise and differential signal transmission characteristics. Analytical expressions for the four-port impedance matrix of the CGP-EBG MTM-DTL are derived using coupled-line theory and a segmentation method. Converting the impedance matrix into mixed-mode scattering parameters enables obtaining common-mode noise suppression and differential signal transmission characteristics. The comprehensive evaluations of the CGP-EBG MTM-DTL using the proposed analytical model are also reported, which is validated by comparing mixed-mode scattering parameters Scc21 and Sdd21 with those obtained from full-wave simulations and measurements. The proposed analytical model provides a drastic reduction of computation time and accurate results compared to full-wave simulation.

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