scholarly journals Design of a T-Shaped Antenna Based on Characteristic Mode Manipulation for Metal-Framed Handset Application

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 209
Author(s):  
Chong-Zhi Han ◽  
Guan-Long Huang ◽  
Tao Yuan ◽  
Ju-Zhen Wang
Keyword(s):  
Radio Frequency ◽  
Design Concept ◽  
Experimental Results ◽  
Radiation Patterns ◽  
Characteristic Mode ◽  
Rf Switches ◽  
Feed Point ◽  
Characteristic Modes ◽  
Operating Bandwidth ◽  
Metal Frame

Recently, metal-framed handset antennas have aroused much attention due to their fantastic appearance and superior robustness. In this paper, a T-shaped antenna suitable for integration with a USB connector is proposed for metal-framed handset application by utilizing the theory of characteristic modes (TCM). Five eigenmodes, one for the lower band and four for the higher band, were merged by a T-shaped metal frame, a feed point, and two shorting pins, as well as three radio frequency (RF) switches so as to broaden the antenna’s operating bandwidth. A prototype was fabricated in order to verify the design concept. Experimental results showed that the proposed antenna was able to cover bandwidths of 0.824–0.960 GHz (GSM band) and 1.710–2.690 GHz (DCS, PCS, UMTS, and LTE bands) with an acceptable radiation efficiency of up to 50% and satisfactory radiation patterns.

Detection and Recognition of RF Devices Using Support Vector Machine

2013 ◽  
Vol 5 (4) ◽  
pp. 13-20
Author(s):  
Shikhar P. Acharya ◽  
Ivan G. Guardiola
Keyword(s):  
Support Vector Machine ◽  
Radio Frequency ◽  
Experimental Results ◽  
Support Vector ◽  
Noise Band ◽  
Detection And Identification ◽  
Electromagnetic Emissions ◽  
Rf Devices ◽  
Unintended Electromagnetic Emissions ◽  
Detection And Recognition

Radio Frequency (RF) devices produce some amount of Unintended Electromagnetic Emissions (UEEs). UEEs are generally unique to a device and can be used as a signature for the purpose of detection and identification. The problem with UEEs is that they are very low in power and are often buried deep inside the noise band. The research herein provides the application of Support Vector Machine (SVM) for detection and identification of RF devices using their UEEs. Experimental Results shows that SVM can detect RF devices within the noise band, and can also identify RF devices using their UEEs.

scholarly journals A Walking Training System with Customizable Trajectory Designing

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Shiyang Dong ◽  
Takafumi Matsumaru
Keyword(s):  
Interaction Design ◽  
Detection Method ◽  
Training System ◽  
Human Robot Interaction ◽  
Design Concept ◽  
Experimental Results ◽  
Robot Interaction ◽  
Coordination Training ◽  
Foot Model ◽  
New System

AbstractThis paper shows a novel walking training system for foot-eye coordination. To design customizable trajectories for different users conveniently in walking training, a new system which can track and record the actual walking trajectories by a tutor and can use these trajectories for the walking training by a trainee is developed. We set the four items as its human-robot interaction design concept: feedback, synchronization, ingenuity and adaptability. A foot model is proposed to define the position and direction of a foot. The errors in the detection method used in the system are less than 40 mm in position and 15 deg in direction. On this basis, three parts are structured to achieve the system functions: Trajectory Designer, Trajectory Viewer and Mobile Walking Trainer. According to the experimental results,we have confirmed the systemworks as intended and designed such that the steps recorded in Trajectory Designer could be used successfully as the footmarks projected in Mobile Walking Trainer and foot-eye coordination training would be conducted smoothly.

scholarly journals Characteristic Mode Analysis of surface current distributions on metallic structures exposed to HIRF- and DCI-excitations

2020 ◽  
Vol 18 ◽  
pp. 33-41
Author(s):  
Jan Ückerseifer ◽  
Frank Gronwald
Keyword(s):  
Three Dimensional ◽  
Surface Current ◽  
Resonance Region ◽  
Mode Analysis ◽  
Surface Currents ◽  
Characteristic Mode ◽  
Metallic Structures ◽  
Current Distributions ◽  
Characteristic Modes ◽  
Physical Quantities

Abstract. This paper treats Characteristic Mode Analyses of three-dimensional test objects in the context of EMC. Based on computed Characteristic Modes and mode-specific physical quantities, series expansions for HIRF- and DCI-induced surface currents are deduced. The contribution of single Characteristic Modes to surface currents at different test frequencies is analyzed. HIRF- and DCI-excitations are compared with regard to their surface current distributions in their resonance region determined by Characteristic Mode Analysis.

Use of Saline Injection to Create Large Thermal Lesions During Radio Frequency Ablation Therapy: 2. Experimental Results

2001 ◽  
Author(s):  
Lissa P. Silver ◽  
Patrick S. Hamilton ◽  
Angela C. Ni ◽  
Roberto M. Aimi ◽  
Michael G. Curley
Keyword(s):  
Heat Transfer ◽  
Radio Frequency ◽  
Liver Tumors ◽  
Treatment Options ◽  
Left Ventricular ◽  
Electrode Site ◽  
Experimental Results ◽  
Interface Temperature ◽  
Invasive Treatment ◽  
Ablation Therapy

Abstract Tissue charring during radio frequency (RF) therapy causes an impedance rise and prevents further tissue heating from occurring, thereby limiting the size of lesions that can be created. The ability to create very large lesions would provide minimally invasive treatment options for deep tissue left ventricular arrythmias and otherwise-untreatable large liver tumors. Adding convection as a method of heat transfer by injecting saline at the RF electrode site acts to both clamp the electrode/tissue interface temperature and carry energy deeper into the tissue. We have developed a RF system that uses both conduction and convection simultaneously to both enhance the amount of heat transfer and prevent or greatly delay the onset of charring. Here we confirm the heat transfer augmentation of convection with experimental results in skeletal muscle, liver, and myocardium.

Coherent Passive Backscatter Communications Using Ambient Transmitters

2014 ◽  
Vol 5 (2) ◽  
pp. 23-43
Author(s):  
William C. Barott ◽  
Kevin M. Scott
Keyword(s):  
Radio Frequency ◽  
Low Complexity ◽  
Data Rate ◽  
Experimental Results ◽  
Digital Television ◽  
Passive Radar ◽  
Detection Range ◽  
Backscatter Modulation ◽  
Radio Frequency Signals ◽  
Processing Algorithms

A communications method is presented based on the backscatter modulation of incident radio frequency signals using low-complexity tags. The incident signals arise from digital television stations used as illuminators of opportunity. A receiver detects the tag using coherent processing algorithms similar to those used in passive radar, extending the detection range over published noncoherent techniques. This method enables shared use of the UHF television band for low-data-rate applications. While analyses suggest that rates exceeding 1 kbps might be achievable at 1 km range, experimental results demonstrate the challenges in designing and implementing such a system.

Design concept and experimental results of the autonomous underwater vehicle AQUA EXPLORER 2 for the inspection of underwater cables

2002 ◽  
Vol 16 (1) ◽  
pp. 27-42 ◽  
Author(s):  
Kenichi Asakawa ◽  
Junichi Kojima ◽  
Yoichi Kato ◽  
Shigetaka Matsumoto ◽  
Naomi Kato ◽  
...  
Keyword(s):  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle ◽  
Design Concept ◽  
Experimental Results ◽  
Underwater Cables

Improving the Reliability of RFID Interrogator by an Inclined Contact Surface Design in Vehicle Infrastructure Cooperation Systems

2014 ◽  
Vol 525 ◽  
pp. 297-300
Author(s):  
Xu Xu ◽  
Yi Zhang
Keyword(s):  
Radio Frequency ◽  
Contact Surface ◽  
Radio Frequency Identification ◽  
Energy Coupling ◽  
Experimental Results ◽  
Curved Surface ◽  
Surface Design ◽  
Frequency Identification

An inclined contact surface design for Radio Frequency Identification (RFID) interrogator with easy-pick gaps has been developed. Compared with the curved surface and pallet surface, the performance of inclined contact surface has been investigated in the calculated electromagnetic configurations and experimental results. It is found that the inclined contact surface has the improved reliability of data writing of RFID. By experimentally and theoretically analyzing, the improved reliability is considered to be the combined results of the energy coupling configurations and the depressed material contacts effect.

Tumor localization using radio-frequency identification clip marker: experimental results of an ex vivo porcine model

2018 ◽  
Vol 33 (5) ◽  
pp. 1441-1450 ◽  
Author(s):  
Hwan Yi Joo ◽  
Bong Eun Lee ◽  
Chang In Choi ◽  
Dae Hwan Kim ◽  
Gwang Ha Kim ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Porcine Model ◽  
Ex Vivo ◽  
Experimental Results ◽  
Tumor Localization ◽  
Frequency Identification
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