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Displaying 51 - 75 of 3117

Determining the Angle-of-Arrival of an Radio-Frequency Source with a Rydberg Atom-Based Sensor

October 22, 2021

Author(s)

Amy Robinson, Nik Prajapati, Damir Senic, Matt Simons, Christopher L. Holloway

In this work we demonstrate the use of a Rydberg atom-based sensor for determining the angle-of- arrival of an incident radio-frequency (RF) wave or signal. The technique uses electromagnetically induced transparency (EIT) in Rydberg atomic vapor in

Real-Time mmWave Channel Sounding Through Switched Beamforming With 3-D Dual-Polarized Phased-Array Antennas

September 7, 2021

Author(s)

Derek Caudill, Jack Chuang, Sung Yun Jun, Camillo Gentile, Nada T. Golmie

We propose a 28.5-GHz channel sounder that switches through all antennas of multiple dual-polarized 8×8 phased arrays at the transmitter and receiver and performs beamforming in postprocessing through digital weights to synthesize a sweepable beam. To our

Evaluating solder joint failures and solder joint reliability: A side-by-side comparison of Direct Current and Microwave Based Monitoring Techniques

August 23, 2021

Author(s)

Yaw S. Obeng, Papa Amoah

Historically, the evaluating solder joint failures and solder joint reliability have been done with DC methods using event detectors or data loggers for high-frequency circuits. Direct high-frequency RF measurements of signal paths are potentially more

Dielectric-Loaded Microwave Rectangular Waveguide and Higher Order Modes Resonator

June 2, 2021

Author(s)

Christopher L. Holloway, Abdulaziz H. Haddab, Edward Kuester

Resonant transmission through a dielectric-loaded slot in a thick conducting diaphragm embedded in a rectangular waveguide is modeled using an analytical approximation based on the slot being small compared to a free space wavelength. Image theory relates

Measurement Challenges for Spectrum Sensing in Communication Networks

April 27, 2021

Author(s)

Dan Kuester, Yao Ma, Dazhen Gu, Adam Wunderlich, Jason Coder, Joseph R. Mruk

We summarize a few key spectrum sensing measurement challenges and recent advances. Laboratory tests of sensing are complicated by their inseparable and often imbedded role in modern hardware. Results are difficult to calibrate because physical parameters

Quasi-Deterministic Channel Propagation Model for an Urban Environment at 28 GHz

April 16, 2021

Author(s)

Neeraj Varshney, Jian Wang, Chiehping Lai, Camillo Gentile

We reduced parameters of the Quasi-Deterministic channel propagation model, recently adopted by the IEEE 802.11ay task group for next-generation Wi-Fi at millimeter-wave, from measurements collected in an urban environment with our 28 GHz directional

Measuring the Impact of Beamwidth on the Correlation Distance of 60 GHz Indoor and Outdoor Channels

March 22, 2021

Author(s)

Aidan Hughes, Sung Yun Jun, Camillo Gentile, Derek Caudill, Jack Chuang, Jelena Senic

Due to high antenna directionality and channel sparseness, millimeter-wave receivers will detect much less multipath then their microwave counterparts, fundamentally changing the small-scale fading observed. In particular, the de facto Rayleigh-Rice model

Josephson Microwave Sources Applied to Quantum Information Systems

December 18, 2020

Author(s)

Adam J. Sirois, Manuel C. Castellanos Beltran, Anna E. Fox, Samuel P. Benz, Peter F. Hopkins

Quantum computers with thousands or millions of qubits will require a scalable solution for qubit control and readout electronics. Colocating these electronics at millikelvin temperatures has been proposed and demonstrated, but there exist significant

Superconducting nanowire single-photon detectors with 98% system detection efficiency at 1550 nm

November 23, 2020

Author(s)

Dileep Reddy, Robert R. Nerem, Sae Woo Nam, Richard Mirin, Varun Verma

Superconducting nanowire single-photon detectors (SNSPDs) are an enabling technology for a myriad of quantum-optics experiments that require high-efficiency detection, large count rates, and precise timing resolution. The system detection efficiency (SDE)

Calibration of Ray-Tracing with Diffuse Scattering against 28-GHz Directional Urban Channel Measurements

November 18, 2020

Author(s)

Camillo Gentile, Jelena Senic, Chiehping Lai, Derek Caudill, Jack Chuang, Nada Golmie

This paper describes the calibration of the Volcano ray-tracing engine against channel measurements collected in an urban environment with a 28 GHz directional channel sounder. Channel multi-path components were extracted from the measurements in the delay

Noise Influence on Scattering-Parameter Measurements

November 4, 2020

Author(s)

Dazhen Gu, Jeffrey A. Jargon, Matthew J. Ryan, Anouk Hubrechsen

We present a general model of noise-influenced scattering (S) parameter measurements performed by a vector network analyzer (VNA). The residual error of the S-parameter due to the noise appears like a complex Gaussian quotient. The statistical analysis of

Note: A Radio Frequency Voltage-Controlled Current Source for Quantum Spin Manipulation

October 19, 2020

Author(s)

Daniel S. Barker, Alessandro Restelli, James A. Fedchak, Julia K. Scherschligt, Stephen P. Eckel

We present a design for a wide-bandwidth, voltage-controlled current source that is easily integrated with radiofrequency magnetic field coils. Our design uses current feedback to compensate for the frequency-dependent impedance of a radiofrequency antenna

Josephson Arbitrary Waveform Synthesizer as a Reference Standard for the Calibration of Lock-in Amplifiers

August 24, 2020

Author(s)

Dimitrios Georgakopoulos, Ilya F. Budovsky, Samuel Benz

We have extended the voltage range of the Josephson arbitrary waveform synthesizer from 1 mV down to 1 μV at frequencies from 60 Hz to 1 kHz to calibrate precision lock-in amplifiers. Experimental results show that the system's uncertainty is dominated by

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