scholarly journals Ultrathin dual-mode vortex beam generator based on anisotropic coding metasurface

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Liang Zhang ◽  
Jie Guo ◽  
Tongyu Ding
Keyword(s):  
Communication Systems ◽  
Single Layer ◽  
Wireless Communication Systems ◽  
Vortex Beam ◽  
Proof Of Concept ◽  
Dual Mode ◽  
Polarized Waves ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Incident Waves

AbstractIn this paper, an anisotropic coding metasurface is proposed to achieve dual-mode vortex beam generator by independently manipulating the orthogonally linearly polarized waves. The metasurface is composed of ultrathin single-layer ground-backed Jerusalem cross structure, which can provide complete and independent control of the orthogonally linearly polarized incident waves with greatly simplified design process. As proof of concept, a metasurface is designed to generate vortex beams with different topological charges under orthogonal polarizations operating at 15 GHz. Experimental measurements performed on fabricated prototype reveal high quality, and show good agreements with theoretical designs and simulation results. Such ultrathin dual-mode vortex beam generator may find potential applications in wireless communication systems in microwave region.

Ultrathin Dual-Mode Vortex Beam Generator Based on Anisotropic Coding Metasurface

2020 ◽  
Author(s):  
Liang Zhang ◽  
Jie Guo ◽  
Tongyu Ding
Keyword(s):  
Communication Systems ◽  
Single Layer ◽  
Wireless Communication Systems ◽  
Vortex Beam ◽  
Dual Mode ◽  
Polarized Waves ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Incident Waves ◽  
Is Design

Abstract In this paper, anisotropic coding metasurfaces is proposed to achieve dual-mode vortex beam generator by independently manipulating the orthogonally linearly polarized waves. The metasurface is composed of ultrathin single-layer ground-backed Jerusalem cross structure, which can provide complete and independent control of the orthogonally linearly polarized incident waves with greatly simplified design process. As proof of concept, a metasurface is design to generate vortex beams with different topological charges under orthogonal polarizations operating at 15 GHz. Experimental measurements performed on fabricated prototype reveal high quality, and show good agreements with theoretical designs and simulation results. Such ultrathin dual-mode vortex beam generator may find potential applications in wireless communication systems in microwave region.

scholarly journals Beampattern analysis of frequency diverse array radar: a review

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Zeeshan Ahmad ◽  
Meng Chen ◽  
Shu-Di Bao
Keyword(s):  
Communication Systems ◽  
Essential Feature ◽  
Beam Steering ◽  
Frequency Offset ◽  
Wireless Communication Systems ◽  
Electronic Beam Steering ◽  
Potential Applications ◽  
Frequency Offsets ◽  
Frequency Diverse Array ◽  
Beampattern Synthesis

AbstractElectronic beam steering is an essential feature of state-of-the-art radar systems. Conventional phased array (PA) radars with fixed carrier frequencies are well-known for electronically steering their beam with high directivity. However, the resulting beampattern is angle-dependent but range-independent. Recently, a new electronic beam steering concept, referred to as frequency diverse array (FDA) radar, has attracted increasing attention due to its unique range-angle dependent beampattern. More importantly, the FDA radar employs a small frequency increment across the array elements to achieve beam steering as a function of angle, range, and time. In this paper, we review the development of the FDA radar since its inception in 2006. Since the frequency offset attaches great importance in FDAs to determine the beampattern shape, initially much of the research and development were focused on designing the optimal frequency offsets for improved beampattern synthesis. Specifically, we analyze characteristics of the FDA beampattern synthesis using various frequency offsets. In addition to analyzing the FDA beampattern characteristics, this study also focuses on the neglected propagation process of the transmitted signals in the early FDA literature, and discuss the time-variant perspective of FDA beampatterns. Furthermore, FDA can also play a significant role in wireless communications, owing to its potential advantages over the conventional PAs. Therefore, we highlight its potential applications in wireless communication systems. Numerical simulations are implemented to illustrate the FDA beampattern characteristics with various frequency offset functions.

Advances in Quaternary and Pentanary Semiconductors for Communication and Networking Applications

2016 ◽  
Vol 689 ◽  
pp. 98-102
Author(s):  
Nishu Gupta ◽  
K.M. Gupta ◽  
Preeti Taivatiya ◽  
Ritu Garg
Keyword(s):  
Communication Systems ◽  
Ad Hoc ◽  
Dominant Role ◽  
Wireless Communication Systems ◽  
Solar Panels ◽  
Communication Devices ◽  
Potential Applications ◽  
Self Powered ◽  
Future Direction ◽  
Ternary Semiconductors

Semiconductors play important role in communication applications right from allowing solar panels to harvest light energy along with acting as the receiver elements of light‐based communication network. These self‐powered nodes allow network of communicating devices to be assembled within the Internet of things, wireless sensor network, mobile/vehicular ad-hoc network and many more potential applications. After initial uses of binary and ternary semiconductors, the research paradigm has now shifted towards quaternary and pentanary semiconductors. These classes of semiconductors are playing dominant role in communication devices because of their flexibility to get easily fabricated by changing the composition of their elemental materials. This paper deals with such novel semiconductors whose properties would certainly leverage the future direction of research in wireless communication systems.

Design of Microstrip Triplexer Using Common Dual-Mode Resonator with Multi-Spurious Mode Suppression for Multiband Applications

2015 ◽  
Vol 763 ◽  
pp. 182-188
Author(s):  
Tantiviwat Sugchai ◽  
Intarawiset Nattapong ◽  
Chanthong Apirun
Keyword(s):  
Fundamental Frequency ◽  
Communication Systems ◽  
Design Method ◽  
Wireless Communication Systems ◽  
Dual Mode ◽  
Design Guideline ◽  
Mode Suppression ◽  
Spurious Mode ◽  
Channel Separation ◽  
Mode Resonator

A triplexer is an important component for channel separation in microwave front-end systems. This paper proposes a triplexers designed with common dual mode resonator sections have been proposed. By exploiting the variable frequency response of the stepped-impedance resonator, resonators can be shared by the three filter channels of the desired triplexer if their fundamental and the first spurious resonant frequency are properly assigned. Triplexer design method for suppressing spurious responses in the stopband by choosing the constitutive resonators with the same fundamental frequency, but staggered higher order resonant frequencies. The design concept is demonstrated by three of third order parallel-coupled bandpass filters. The bandpass filter is composed of three different stepped impedance resonators for which a general design guideline had been provided in order have the same fundamental frequency and different spurious frequencies. The measured results are in good agreement with the simulated predictions, whereby the spurious responses in the upper stopband can be suppressed below-25dB up to 14 GHz, which can be quite useful for multiband and multiservice applications in future wireless communication systems.

Unusual Properties of Anisotropic Magnetodielectric Metamaterials

2014 ◽  
Vol 1082 ◽  
pp. 46-50
Author(s):  
Yun Xia Dong ◽  
Chun Ying Liu
Keyword(s):  
Electromagnetic Field ◽  
Green Function ◽  
Layer Structure ◽  
Single Layer ◽  
Input Output ◽  
Anisotropic Metamaterials ◽  
Polarized Waves ◽  
Linearly Polarized ◽  
The Green Function ◽  
Green Function Approach

A phenomenological quantization of electromagnetic field is introduced in the presence of the anisotropic magnetodielectric metamaterials. For a single layer structure with the anisotropic metamaterials, input-output relations are derived using the Green-function approach. Based on these relations, the reflectance of the linearly polarized wave through this structure is calculated. The results show different reflectance for different polarized waves and indicate an application of the anisotropic metamaterials to be the reflectors for certain polarized wave. Furthermore it is found that such a structure can realize the resonant gap with the increase of the thickness. Finally the effects of the absorption are considered and we find that the above properties do not change with introduction of the absorption.

scholarly journals Designing Smart Electromagnetic Environments for Next-Generation Wireless Communications

Telecom ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 213-221
Author(s):  
Andrea Massa ◽  
Arianna Benoni ◽  
Pietro Da Rù ◽  
Sotirios K. Goudos ◽  
Baozhu Li ◽  
...  
Keyword(s):  
Communication Systems ◽  
Design Methodology ◽  
Primary Source ◽  
Wireless Communication Systems ◽  
Proof Of Concept ◽  
Next Generation ◽  
Target Region ◽  
Simulation Tools ◽  
Numerical Result ◽  
Em Field

The design of a smart electromagnetic (EM) environment for next-generation wireless communication systems is addressed in this work. The proposed approach aims at synthesizing a desired EM field distribution over a target region, where the receiving terminals are located, through the opportunistic exploitation of the complex scattering interactions between the EM field generated by a reconfigurable primary source and the objects/scatterers present in the environment, which behave as application-driven passive metastructures. The effectiveness and the potentialities of the proposed design methodology are assessed with a proof-of-concept numerical result obtained by means of advanced and reliable simulation tools.

scholarly journals Broadband Dual-Polarized Single-Layer Reflectarray Antenna with Independently Controllable 1-Bit Dual Beams

2020 ◽  
Author(s):  
Jiexi Yin ◽  
Qun Lou ◽  
Haiming Wang ◽  
Zhining Chen ◽  
Wei Hong
Keyword(s):  
Phase Difference ◽  
Multiple Input Multiple Output ◽  
Single Layer ◽  
Unit Cell ◽  
Dual Beam ◽  
Polarized Waves ◽  
Unit Cells ◽  
Linearly Polarized ◽  
Reflectarray Antenna ◽  
Dual Polarized

<p>A broadband dual-polarized single-layer 1-bit unit cell is proposed for achieving the independently controllable dual-beam reflectarray antenna. The unit cell independently provides two-state phase compensation for two orthogonally linearly-polarized waves. The 180-degree reflective phase difference between the two states is achieved by tuning the magnetic resonance of State 0 and the electrical resonance of State 1. With its two resonances close to each other, the unit cell has a reflective phase difference of 180±20 degrees between two states over a broad bandwidth of 27.2-51.1 GHz. The cross-polarization levels of below -30 dB ensure the high isolation between two polarizations. Using the proposed dual-polarized unit cells, a 1-bit dual-beam reflectarray antenna is designed and excited by a dual-polarized horn to show the ability of independently controlling two orthogonally linearly-polarized waves. At 33 GHz, the beams direct to -15 degrees and 20 degrees for the feeding of horizontally and vertically polarized port, respectively. The 1.5-dB gain bandwidth is greater than 20% for both polarizations. The proposed dual-polarized reflectarray antenna with independently controllable 1-bit dual beams provides an alternative design for the multiuser multiple-input multiple-output applications.</p>

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