scholarly journals Smartphone Model Fingerprinting using WiFi Radiation Patterns

2021 ◽  
Author(s):  
Thomas Burton ◽  
Kasper Rasmussen
Keyword(s):  
Radiation Pattern ◽  
Wireless Devices ◽  
Radiation Patterns ◽  
Small Set

This paper aims to demonstrate the feasibility of our proposed method for fingerprinting different classes of wireless devices. Our method relies on the observation that different device types, or indeed different models of the same type, have different wireless radiation patterns. We show in detail how a small set of stationary receivers can measure the radiation pattern of a transmitting device in a completely passive manner. As the observed device moves, our method can gather enough data to characterize the shape of the radiation pattern, which can be used to determine the type of the transmitting device from a database of patterns. We demonstrate that the patterns produced by different models of smartphones are easily different enough to be identified. Our measurements are repeatably measurable using RSS with commercial-off-theshelf hardware. We then use simulations to show the success of our method as a classifier.

scholarly journals A Planar Reconfigurable Radiation Pattern Dipole Antenna with Reflectors and Directors for Wireless Communication Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Imen Ben Trad ◽  
Jean Marie Floc’h ◽  
Hatem Rmili ◽  
M’hamed Drissi ◽  
Fethi Choubani
Keyword(s):  
Wireless Communication ◽  
Radiation Pattern ◽  
Dipole Antenna ◽  
Radiation Patterns ◽  
Pin Diodes ◽  
Dual Beam

A planar printed dipole antenna with reflectors and directors, able to steer its radiation pattern in different directions, is proposed for telecommunication applications. Starting from a dual-beam printed dipole antenna achieved by combining two elementary dipoles back to back, and by loading four PIN diodes, three modes of reconfigurable radiation patterns are achieved at the frequency 2.56 GHz thanks to switches states. A prototype of the structure was realized and characterized; an efficiency of 75% is obtained. Simulation and measured results of the results are presented and discussed.

Visualizing effects of anisotropy on seismic moments and their potency-tensor isotropic equivalent

Geophysics ◽  
2018 ◽  
Vol 83 (3) ◽  
pp. C85-C97 ◽  
Author(s):  
Nepomuk Boitz ◽  
Anton Reshetnikov ◽  
Serge A. Shapiro
Keyword(s):  
Radiation Pattern ◽  
Elastic Anisotropy ◽  
Moment Tensor ◽  
Matrix Multiplication ◽  
Tensor Decomposition ◽  
P Wave ◽  
Propagation Path ◽  
Tectonic Deformation ◽  
Radiation Patterns ◽  
Rock Anisotropy

Radiation patterns of earthquakes contain important information on tectonic strain responsible for seismic events. However, elastic anisotropy may significantly impact these patterns. We systematically investigate and visualize the effect of anisotropy on the radiation patterns of microseismic events. For visualization, we use a vertical-transverse-isotropic (VTI) medium. We distinguish between two different effects: the anisotropy in the source and the anisotropy on the propagation path. Source anisotropy mathematically comes from the matrix multiplication of the anisotropic stiffness tensor with the source strain expressed by the potency tensor. We analyze this effect using the corresponding radiation pattern and the moment tensor decomposition. Propagation anisotropy mathematically comes from the deviation between the polarization and the propagation direction of a quasi P-wave in an anisotropic medium. We investigate both effects separately by either assuming the source to be anisotropic and the propagation to be isotropic or vice versa. We find that both effects have a significant impact on the radiation pattern of a pure-slip source. Finally, we develop an alternative visualization of source mechanisms by plotting beach balls proportional to their potency tensors. For this, we multiply the potency tensor with an isotropic elasticity tensor having the equivalent shear modulus [Formula: see text] and [Formula: see text]. In this way, we visualize the tectonic deformation in the source, independently of the rock anisotropy.

scholarly journals Ultrawideband Low-Profile and Miniaturized Spoof Plasmonic Vivaldi Antenna for Base Station

2020 ◽  
Vol 10 (7) ◽  
pp. 2429 ◽  
Author(s):  
Li Hui Dai ◽  
Chong Tan ◽  
Yong Jin Zhou
Keyword(s):  
Radiation Pattern ◽  
Frequency Band ◽  
High Gain ◽  
Base Station ◽  
Ultra Wideband ◽  
Radiation Patterns ◽  
Low Profile ◽  
Simulation Results ◽  
Vivaldi Antenna ◽  
Good Agreement

Stable radiation pattern, high gain, and miniaturization are necessary for the ultra-wideband antennas in the 2G/3G/4G/5G base station applications. Here, an ultrawideband and miniaturized spoof plasmonic antipodal Vivaldi antenna (AVA) is proposed, which is composed of the AVA and the loaded periodic grooves. The designed operating frequency band is from 1.8 GHz to 6 GHz, and the average gain is 7.24 dBi. Furthermore, the measured results show that the radiation patterns of the plasmonic AVA are stable. The measured results are in good agreement with the simulation results.

scholarly journals A Compact ACS-Fed Tri-band Microstrip Monopole Antenna for WLAN/WiMAX Applications

2018 ◽  
Vol 7 (5) ◽  
pp. 87-93 ◽  
Author(s):  
D. Kahina ◽  
C. Mouloud ◽  
D. Mokrane ◽  
M. Faiza ◽  
A. Rabia
Keyword(s):  
Radiation Pattern ◽  
Return Loss ◽  
Simple Structure ◽  
Ground Plane ◽  
Monopole Antenna ◽  
Radiation Patterns ◽  
Total Size ◽  
Resonant Frequencies ◽  
Compact Size ◽  
Microstrip Monopole Antenna

This paper proposes a novel small asymmetric coplanar strip (ACS) fed tri-band monopole antenna for WLAN and WiMAX applications. To tune and create multiple resonant frequencies, the exciting strip of monopole antenna is connected to two different arms which are a J-shaped directed toward the asymmetric ground plane and an open stub. The proposed monopole antenna with a total size of 14.6 x17.5 mm2 is fabricated and tested. The measured results indicate that the antenna has impedance bandwidths for 10-dB return loss reach about 500 MHz (2.01-2.52 GHz), 230 MHz (3.48-3.71 GHz) and 1.2GHz (5.59-6.72 GHz) which cover widely the 2.4/5.8 GHz WLAN bands and the 3.5GHz WiMAX band. The simulated radiation patterns of the proposed antenna at the three resonant frequencies have a dipole-like radiation pattern in both E-and H-Planes. The compact size, the simple structure and good radiation performances of the proposed antenna makes it well-suited forthe intended applications.

scholarly journals Synthesis of Angle Arrays by the NDF of the Radiation Integral

2020 ◽  
Author(s):  
Giovanni Leone ◽  
Fortuna Munno ◽  
Rocco Pierri
Keyword(s):  
Inverse Problem ◽  
Radiation Pattern ◽  
Degrees Of Freedom ◽  
Synthesis Problem ◽  
Radiation Patterns ◽  
Pattern Synthesis ◽  
Source Geometry ◽  
Hemispherical Coverage

<div>This manuscript has been accepted for publication on IEEE Transactions on Antennas and Propagation.</div><div><br>Abstract:<br>The paper adopts an inverse problem approach to investigate the far zone radiation of a collection of 2D linear sources. By the evaluation of the number of independent pieces of information, i.e. the number of degrees of freedom (NDF), and the analysis of the reconstruction of a focusing beam, the role of the geometry can be examined in determining the set of possible radiation patterns. The results are relevant to the radiation pattern synthesis problem, since they allow to define the optimal source geometry for the hemispherical coverage with identical radiation patterns. </div>

Yagi-Uda Antenna for Navigational Aids Using HFSS

2017 ◽  
Vol 8 (3) ◽  
pp. 627
Author(s):  
Ramesh P. ◽  
V. Mathivanan
Keyword(s):  
Radiation Pattern ◽  
Frequency Band ◽  
High Frequency ◽  
Return Loss ◽  
Impedance Matching ◽  
Radiation Patterns ◽  
Ultra High Frequency ◽  
Navigational Aids ◽  
The Stability ◽  
Uhf Band

<p>In this paper, the ultra high frequency of yagi-uda antenna for navigational has been designed to improve the usable bandwidth by improving the stability of the radiation patterns. The frequency band of ultra high frequency is 300-3000 MHZ. The main aim of this paper is to reduce the loss, improve the gain and also to enhance the efficiency of ultra high frequency yagi-uda antenna for utilizing the navigational aids. The proposed UHF band of Yagi-Uda antenna has been designed by using ANSYS HFSS tool for the application of navigational aids. The characteristics specifications of yagi-uda antenna such as Radiation pattern, S11 (return loss), impedance matching and gain are analyzed in this work.</p>

scholarly journals A Triband Patch Antenna with Monopole-like and Patch-like Radiation Patterns for Multifunctional Wireless Systems

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Hai-Na Song ◽  
Zhao-Hui Chen ◽  
Jian-Feng Li
Keyword(s):  
Radiation Pattern ◽  
Patch Antenna ◽  
Ground Plane ◽  
Wireless Systems ◽  
Metal Sheet ◽  
Radiation Patterns ◽  
Zeroth Order ◽  
Annular Slot ◽  
The Third

A triband patch antenna with monopole-like and patch-like radiation patterns for multifunctional wireless systems is proposed. The antenna consists of a single square radiation patch with an annular slot, a ground plane, and a top-loaded metal sheet. The top-loaded metal sheet is shorted to the ground plane for producing a zeroth-order resonant (ZOR) mode, which has an omnidirectional radiation pattern at the lowest operation band, and its performance is robust to the location of the probe feed. With the annular slot and the off-center probe feed, a dual-resonant TM01 mode is excited, yielding unidirectional radiation patterns for the two upper operation bands. The ZOR and the dual-resonant TM01 modes can be independently controlled, and a triband antenna prototype with a square patch of 24 mm is fabricated and tested. The first bandwidth is 2.5–2.7 GHz with omnidirectional radiation pattern, the second and the third bandwidths with unidirectional radiation are 3.3–3.9 GHz and 4.8–6.1 GHz, and the realized gains over the three bands are about 2.6, 6.5, and 7.5 dBi, respectively.

scholarly journals Design of Dual Band Sleeve Dipole Antenna for Mobile Jammer Applications

2015 ◽  
Vol 16 (1) ◽  
pp. 106
Author(s):  
Tariq Rahim ◽  
Jiaodong Xu
Keyword(s):  
Radiation Pattern ◽  
Dipole Antenna ◽  
Coaxial Cable ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Wireless Devices ◽  
Scattering Parameter ◽  
Directional Characteristics ◽  
Pass Through ◽  
Indoor And Outdoor

A multi band sleeve dipole antenna for jammer application is proposed. The antenna can cover band in which mobile and other wireless devices operate. The design antenna shows very good omni-directional characteristics and scattering parameter S11 value less than -10db. The dipole is made of two concentric hallow cylinder with different radius and different lengths. The antenna is fed at the center with coaxial cable pass through the bottom cylinder and thus avoids the use of complicated balun network. The impedance bandwidth and the radiation pattern are measured and analyzed both at 900 MHz and 1.8 GHz. The antenna can also be used GSM/DCS/WCDMA/CDMA2000/ TD-SCDMA /WLAN applications at both indoor and outdoor platform.

scholarly journals An Implementation of Interactive Application for the Synthesis of Communication Systems with Antenna Arrays

2020 ◽  
Vol 23 (2) ◽  
pp. 46-54
Author(s):  
S. V. Kuzmin ◽  
K. O. Korovin ◽  
T. R. Raimzhanov
Keyword(s):  
Radiation Pattern ◽  
Antenna Arrays ◽  
Communication Systems ◽  
Phase Distribution ◽  
Directivity Pattern ◽  
Radiation Patterns ◽  
Coverage Area ◽  
Synthesis Time ◽  
Analysis And Synthesis ◽  
Interactive Application

Introduction. Modern radar and communications systems contain phased array antennas. One of the synthesis problems of such systems is the formulation of requirements for components, modules and units which are comprised in it. To solve this problem, one needs to build a coverage area and to analyze an impact of characteristics of its parts. The quality of analysis and synthesis of such complex systems can be enhanced by use of interactive data visualization, which requires a fairly quick calculation of characteristics.Aim. Development of an interactive application for increasing the synthesis capabilities of communication systems containing antenna arrays and for improving the characteristics of systems of interest.Materials and methods. To accelerate the calculation of radiation patterns, the antenna array pattern in a form suitable for the fast Fourier transform algorithm was used. To find the required amplitude-phase distributions, Kotelnikov series expansion and genetic algorithm were used.Results. In the developed application, amplitude-phase distribution, directivity pattern of a linear equidistant array and coverage area were displayed. An interactive change of the amplitude-phase distribution at radiation elements and synthesized radiation patterns in given directions were possible. With introduction of changes to the radiation pattern, the amplitude-phase distribution and the array radiation pattern itself changed in directions other than the specified one. The coverage area was rebuilt when any of the characteristics changes. If necessary, the coverage area display could be turned off. The paper provides an example of using the application in the synthesis of a communication system with an aircraft.Conclusion. The use of the developed application allows one to extend the capabilities and significantly reduce the analysis and synthesis time of the communication secondary radar systems with antenna arrays too. Besides, the application is used for training specialists for industry enterprises.

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