scholarly journals AUTOMATED NETWORK PROTOCOL EVALUATION – THE POTSDAM WIRELESS TESTBED

2011 ◽  
pp. 337-343
Author(s):  
Sebastian J.F. Fudickar ◽  
Bettina Schnor
Keyword(s):  
Radio Frequency ◽  
Mobile Device ◽  
Radio Signal ◽  
Wireless Testbed ◽  
Wireless Applications ◽  
Processor Architectures ◽  
Log Files ◽  
Measurement Results ◽  
Heterogeneous Processor ◽  
Specific Radio

The Potsdam Wireless Testbed supports validation and evaluation of Wi-Fi radio stacks and wireless applications in environments with heterogeneous hardware. In contrast to simulators, wireless testbeds support the network stack validation with specific radio chipsets and radio signal propagations. Furthermore, wireless testbeds unburden programmers from manually updating software on nodes. Scheduled test-runs are executed automatically for a defined duration including compilation and deployment of the protocols and measurement scripts as well as collection of measurement results and log files. The testbed supports heterogeneous processor architectures and radio chipsets via internal cross compilation. The developer can overview the visualized results of its validation and therefore can focus on the code and the results. Next to the support of several device and processor architectures, the Potsdam Wireless Testbed is intended to support additional radio frequency ranges as well as mobile device.

Passive Radio-Frequency Acoustic Sensors and Systems for Wired and Wireless Applications

MEMS ◽  
2017 ◽  
pp. 417-440
Author(s):  
Sylvain Ballandras ◽  
Gilles Martin ◽  
Jean-Michel Friedt ◽  
Victor Plessky ◽  
Virginie Blondeau-Pâtissier ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Acoustic Sensors ◽  
Wireless Applications

Design of a microstrip dual-frequency diplexer using microstrip cells analysis and coupled lines components

2017 ◽  
Vol 9 (7) ◽  
pp. 1467-1471 ◽  
Author(s):  
Leila Noori ◽  
Abbas Rezaei
Keyword(s):  
General Structure ◽  
Basic Information ◽  
Dual Frequency ◽  
Wireless Applications ◽  
Resonance Frequencies ◽  
Measurement Results ◽  
Coupled Lines ◽  
Lc Circuit ◽  
Insertion Losses ◽  
Good Agreement

In this paper, a microstrip diplexer composed of two similar resonators is designed. The proposed resonator is consisting of four microstrip cells, which are connected to a coupled lines structure. In order to select a suitable geometric structure, first, all cells are assumed as undefined structures where there is a lack of basic information about their geometry and dimensions. Then, an equivalent LC circuit of the coupled lines is introduced and analyzed to estimate the general structure of the resonator respect to a requested resonance frequency. The proposed diplexer is designed to operate at 2.36 and 4 GHz for wireless applications. The insertion losses (S21 and S31) are decreased significantly at the resonance frequencies, so that they are 0.2 and 0.4 dB at 2.36 and 4 GHz, respectively. The designed diplexer is fabricated and measured and the measurement results are in a good agreement with the simulations.

scholarly journals Metamaterial Cell-Based Superstrate towards Bandwidth and Gain Enhancement of Quad-Band CPW-Fed Antenna for Wireless Applications

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 457 ◽  
Author(s):  
Samir Salem Al-Bawri ◽  
Md Shabiul Islam ◽  
Hin Yong Wong ◽  
Mohd Faizal Jamlos ◽  
Adam Narbudowicz ◽  
...  
Keyword(s):  
Refractive Index ◽  
Wave Propagation ◽  
Negative Refractive Index ◽  
Coplanar Waveguide ◽  
Ring Resonators ◽  
Wireless Applications ◽  
Gain Enhancement ◽  
Wide Range ◽  
Measurement Results ◽  
High Bandwidth

A multiband coplanar waveguide (CPW)-fed antenna loaded with metamaterial unit cell for GSM900, WLAN, LTE-A, and 5G Wi-Fi applications is presented in this paper. The proposed metamaterial structure is a combination of various symmetric split-ring resonators (SSRR) and its characteristics were investigated for two major axes directions at (x and y-axis) wave propagation through the material. For x-axis wave propagation, it indicates a wide range of negative refractive index in the frequency span of 2–8.5 GHz. For y-axis wave propagation, it shows more than 2 GHz bandwidth of near-zero refractive index (NZRI) property. Two categories of the proposed metamaterial plane were applied to enhance the bandwidth and gain. The measured reflection coefficient (S11) demonstrated significant bandwidths increase at the upper bands by 4.92–6.49 GHz and 3.251–4.324 GHz, considered as a rise of 71.4% and 168%, respectively, against the proposed antenna without using metamaterial. Besides being high bandwidth achieving, the proposed antenna radiates bi-directionally with 95% as the maximum radiation efficiency. Moreover, the maximum measured gain reaches 6.74 dBi by a 92.57% improvement compared with the antenna without using metamaterial. The simulation and measurement results of the proposed antenna show good agreement.

Dual-polarized, monostatic antenna array with improved Tx–Rx isolation for 2.4 GHz in-band full duplex applications

2020 ◽  
Vol 12 (5) ◽  
pp. 398-408 ◽  
Author(s):  
Haq Nawaz ◽  
Ahmad Umar Niazi ◽  
M. Abdul Basit ◽  
Furqan Shaukat ◽  
Muhammad Usman
Keyword(s):  
Antenna Array ◽  
Interference Cancellation ◽  
Single Layer ◽  
Full Duplex ◽  
Compact Antenna ◽  
Wireless Applications ◽  
Measurement Results ◽  
Phase Balance ◽  
Hybrid Coupler ◽  
Dual Polarized

AbstractThis paper presents a two-elements based, dual polarized, single layer, patch antenna array with improved isolation between transmit (Tx) and receive (Rx) ports for 2.4 GHz in-band full duplex (IBFD) or simultaneous transmit and receive wireless applications. The differential feeding deployed at the Rx port effectively suppresses the coupling which is termed as self-interference from the Tx port to achieve high Tx–Rx interport isolation. A simple 3 dB/180° ring hybrid coupler with nice amplitude and phase balance characteristics has been used for differential Rx operation. The mathematical description for a differential feeding based self-interference cancellation mechanism is also presented for the proposed dual polarized IBFD antenna array. The measurement results for the implemented prototype of the antenna array demonstrate very nice levels of Tx–Rx interport isolation. The implemented single layer, compact antenna array presents 10 dB return-loss bandwidth of more than 50 MHz for both Tx and Rx ports. The prototype achieves >80 dB peak interport isolation and 75 dB (65 dB) isolation in 20 MHz (50 MHz) bandwidth.

scholarly journals Wireless Power Transfer Using Harvested Radio Frequency Energy with Magnetic Resonance Coupling to Charge Mobile Device Batteries

2021 ◽  
Vol 11 (16) ◽  
pp. 7707
Author(s):  
Neetu Ramsaroop ◽  
Oludayo O. Olugbara
Keyword(s):  
Magnetic Field ◽  
Magnetic Resonance ◽  
Radio Frequency ◽  
Mobile Device ◽  
Receiver Coil ◽  
Wireless Power ◽  
Magnetic Resonance Coupling ◽  
Transmitter Coil ◽  
Resonance Coupling ◽  
Rf Energy

This research paper presents the design of a wireless power transfer (WPT) circuit integrated with magnetic resonance coupling (MRC) and harvested radio frequency (RF) energy to wirelessly charge the battery of a mobile device. A capacitor (100 µF, 16 V) in the RF energy harvesting circuit stored the converted power, and the accumulated voltage stored in the capacitor was 9.46 V. The foundation of the proposed WPT prototype circuit included two coils (28 AWG)—a transmitter coil, and a receiver coil. The transmitter coil was energized by the alternating current (AC), which produced a magnetic field, which in turn induced a current in the receiver coil. The harvested RF energy (9.46 V) was converted into AC, which energized the transmitter coil and generated a magnetic field. The electronics in the receiver coil then converted the AC into direct current (DC), which became usable power to charge the battery of a mobile device. The experimental setup based on mathematical modeling and simulation displayed successful charging capabilities of MRC, with the alternate power source being the harvested RF energy. Mathematical formulae were applied to calculate the amount of power generated from the prototype circuit. LTSpice simulation software was applied to demonstrate the behavior of the different components in the circuit layout for effective WPT transfer.

Fabrication and characterization of advanced through glass via interconnects

2016 ◽  
Vol 2016 (1) ◽  
pp. 000288-000292
Author(s):  
Timothy Clingenpeel ◽  
Arian Rahimi ◽  
Seahee Hwangbo ◽  
Yong-Kyu Yoon ◽  
Aric Shorey
Keyword(s):  
Radio Frequency ◽  
Circuit Model ◽  
Fabrication Process ◽  
Electrical Characteristics ◽  
Frequency Range ◽  
High Quality ◽  
Measurement Results ◽  
Fabrication And Characterization ◽  
Copper Structure

Abstract This work presents the fabrication process, electrical characteristics, and circuit model of through glass via (TGV) structures consisting of TGV holes with each diameter of 100 μm and different conductors including copper and composite in the frequency range of 300 kHz to 20 GHz. The Cu/NiFe superlattice metaconductors in combination with high-quality glass (Corning SGW3) are intended to reduce radio-frequency losses especially in 10 GHz and above for next generation communication applications such as 5G communications. The measured results of the copper structure are compared to simulated results. Superlattice metaconductor results will be presented. Based on the simulation and measurement results, a circuit model is demonstrated.

Evaluation and Comparison of Low FPGA Footprint, Embedded Soft-Core Processors

MACRo 2015 ◽  
2017 ◽  
Vol 2 (1) ◽  
pp. 23-30
Author(s):  
László Bakó ◽  
Szabolcs Hajdú ◽  
Fearghal Morgan
Keyword(s):  
Control Algorithm ◽  
Soft Core ◽  
Resource Usage ◽  
Processor Architectures ◽  
Testing Method ◽  
Digital Resource ◽  
Measurement Results

AbstractThe paper presents three embedded soft-core processor architectures, developed by the authors to be easily implementable while yielding low digital resource usage. These architectures will be compared and contrasted between each-other by introducing a special testing method, based on control algorithm implementations. For reference, the same testing and comparison has been implemented on a well established architecture, too, on the Xilinx PicoBlaze processor. Measurement results and application suggestion are given in the concluding section.

Comments on the Langmuir probe measurements of radio-frequency capacitive argon–hydrogen mixture discharge at low pressure

2018 ◽  
Vol 96 (5) ◽  
pp. 494-500 ◽  
Author(s):  
Murat Tanışlı ◽  
Nesli̇han Şahi̇n ◽  
Süleyman Demi̇r
Keyword(s):  
Radio Frequency ◽  
Electron Density ◽  
Langmuir Probe ◽  
Low Pressure ◽  
Hydrogen Gas ◽  
Floating Potential ◽  
Rf Power ◽  
Measurement Results ◽  
Langmuir Probe Measurements ◽  
Probe Measurements

In this paper, the current–voltage graphs of discharge in the chamber of capacitive coupled radio frequency (CCRF) at low pressure were presented for Langmuir probe. The Langmuir probe measurements for estimating the electron density and temperature in capacitive coupled discharges at low pressures were presented and the electron temperatures of the Ar–H2 mixture discharge generated at different conditions were reported using the Langmuir probe. The focus of this study is that the CCRF discharge can be determined and explained using the characteristics of plasma by means of Langmuir probe measurements for the different hydrogen rates in Ar–H2 mixture discharge. The measurement results of Langmuir probe gave values around 1015 m−3 for the electron density. The floating potential depended on the electronegative gas amount. It was found that the increase of hydrogen gas amount in the mixture discharge caused the decrease of the floating potential. Also, a decrease in the argon (Ar) metastable with the increase in hydrogen (H2) content was obtained. When the applied radio frequency (RF) power was increased, the thickness and collisionless sheath occurring at lower RF power could transform to thin sheath.

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