scholarly journals Ultra-Broadband Polarization Conversion Metasurface with High Transmission for Efficient Multi-Functional Wavefront Manipulation in the Terahertz Range

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2895
Author(s):  
Xiaoqiang Jiang ◽  
Wenhui Fan ◽  
Chong Qin ◽  
Xu Chen

Recently, terahertz (THz) wireless communication has been widely investigated as the future prospect of wireless network architecture. However, most of the natural existing materials are inapplicable for THz devices, which hinder their further development. To promote the integration and channel capacity of the THz wireless communication systems, an ultrabroadband polarization conversion metasurface for efficient multi-functional wavefront manipulation is proposed. The designed metasurface is composed of an arrow-type structure sandwiched by a pair of orthogonal gratings, which can induce the Fabry-Pérot-like cavity for improving the transmission. Simulated results indicate that the transmission coefficient of the cross-polarization metasurface is higher than 90% from 0.73 THz to 2.24 THz, and the corresponding polarization conversion ratio is greater than 99.5%. Moreover, the phase coverage of 0–2π at operation frequency can be easily obtained by altering the geometric parameter of the metasurface. To demonstrate the concept of wavefront manipulation, anomalous refraction, focusing metalens, and vortex beam generation are investigated in detail. All of these applications exhibit a remarkable performance of the proposed metasurface that has great potential in prompting the efficient, broadband and compact systems for THz wireless communication.

2014 ◽  
Vol 11 (8) ◽  
pp. 20140184-20140184 ◽  
Author(s):  
Masayuki Oishi ◽  
Naoyasu Kamiya ◽  
Takahide Murakami ◽  
Kosuke Nishimura ◽  
Keiji Tanaka

2021 ◽  
Vol 6 (1) ◽  
pp. 1-7
Author(s):  
Vladyslav Barsiienko ◽  
◽  
Oksana Lashko

The paper presents the stages of creating a software system for decoding light codes and examines the effectiveness of its operation. The relevance of the development is due to the need to combine the speed and distance of information delivery for the further development of wireless communication systems. The authors’ attention is focused on considering the basic components of the designed system. The main algorithms of operation have been presented and the effectiveness of their development has been proved. A comparison with existing means has been made and the prospects for the development of cable free optical communication systems have been emphasized.


Author(s):  
A. Suresh Babu ◽  
B. Anand

: A Linear Feedback Shift Register (LFSR) considers a linear function typically an XOR operation of the previous state as an input to the current state. This paper describes in detail the recent Wireless Communication Systems (WCS) and techniques related to LFSR. Cryptographic methods and reconfigurable computing are two different applications used in the proposed shift register with improved speed and decreased power consumption. Comparing with the existing individual applications, the proposed shift register obtained >15 to <=45% of decreased power consumption with 30% of reduced coverage area. Hence this proposed low power high speed LFSR design suits for various low power high speed applications, for example wireless communication. The entire design architecture is simulated and verified in VHDL language. To synthesis a standard cell library of 0.7um CMOS is used. A custom design tool has been developed for measuring the power. From the results, it is obtained that the cryptographic efficiency is improved regarding time and complexity comparing with the existing algorithms. Hence, the proposed LFSR architecture can be used for any wireless applications due to parallel processing, multiple access and cryptographic methods.


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