Jonathan Chisum
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View article: Electron charge dynamics in metal-dot QCA cell using gate reflectometry
Electron charge dynamics in metal-dot QCA cell using gate reflectometry Open
Quantum-dot cellular automata (QCA) is a field-coupled computational paradigm [C. S. Lent et al., Nanotechnology 4, 49 (1993)] that encodes binary information through the positions of single electrons within quantum-dot cells. In this work…
View article: High-frequency Limits for 3D-Printed Gradient-index (GRIN) Lens Antennas
High-frequency Limits for 3D-Printed Gradient-index (GRIN) Lens Antennas Open
Artificial dielectrics are widely used for Gradient-Index (GRIN) lens antennas. The unit-cell size of an artificial dielectric determines the maximum operating frequency and also drives cost and yield. To explore the frequency limitations …
View article: Feed corrective lenslets for enhanced beamscan in flat lens antenna systems
Feed corrective lenslets for enhanced beamscan in flat lens antenna systems Open
A method for improving beamscan performance of flat lens antenna systems is proposed, wherein small gradient index (GRIN) lenses are included in the feed apertures to correct spillover losses and improve scan collimation. Given a lens syst…
View article: Efficient electromagnetic transducers for spin-wave devices
Efficient electromagnetic transducers for spin-wave devices Open
This paper presents a system-level efficiency analysis, a rapid design methodology, and a numerical demonstration of efficient sub-micron, spin-wave transducers in a microwave system. Applications such as Boolean spintronics, analog spin-w…
View article: Efficient Electromagnetic Transducers For Spin-Wave Devices
Efficient Electromagnetic Transducers For Spin-Wave Devices Open
This paper presents a system-level efficiency analysis, a rapid design methodology, and a numerical demonstration of efficient sub-micron, spin-wave transducers in a microwave system. Applications such as Boolean spintronics, analog spin-w…
View article: The Systematic Design of Noncommensurate Impedance Matching Tapers for Ultrawideband Gradient-Index Lens Antennas
The Systematic Design of Noncommensurate Impedance Matching Tapers for Ultrawideband Gradient-Index Lens Antennas Open
We propose a general method for designing wideband matching tapers in inhomogeneous media where phase velocity is coupled to the taper impedance profile. Such tapers are used to match wideband gradient index (GRIN) lens antennas. To simpli…
View article: The Systematic Design of Non-commensurate Impedance Matching Tapers for Ultra Wideband Gradient-Index (GRIN) Lens Antennas
The Systematic Design of Non-commensurate Impedance Matching Tapers for Ultra Wideband Gradient-Index (GRIN) Lens Antennas Open
We propose a general method for designing wideband matching tapers in inhomogeneous media where phase velocity is coupled to the taper impedance profile. Such tapers are used to match wideband gradient index (GRIN) lens antennas. To simpli…
View article: Steering and organizing committee
Steering and organizing committee Open
AP-S) and the US National Committee (USNC) for the International Union of Radio Science (URSI).It is intended to provide an international forum for the exchange of information on state-of-the-art research on antennas, propagation, electrom…
View article: Radio Frequency Reflectometry of Single-Electron Box Arrays for Nanoscale Voltage Sensing Applications
Radio Frequency Reflectometry of Single-Electron Box Arrays for Nanoscale Voltage Sensing Applications Open
Single-electron tunneling transistors (SETs) and boxes (SEBs) exploit the phenomenon of Coulomb blockade to achieve unprecedented charge sensitivities. Single-electron boxes, however, despite their simplicity compared to SETs, have rarely …
View article: Training-Based Equivalence Relations in Large-Scale Quantized Communication Systems
Training-Based Equivalence Relations in Large-Scale Quantized Communication Systems Open
We show that a quantized large-scale system with unknown parameters and training signals can be analyzed by examining an equivalent system with known parameters by modifying the signal power and noise variance in a prescribed manner. Appli…
View article: Analyzing Training Using Phase Transitions in Entropy - Part II: Application to Quantization and Classification.
Analyzing Training Using Phase Transitions in Entropy - Part II: Application to Quantization and Classification. Open
We show that a quantized large-scale system with unknown parameters and training signals can be analyzed by examining an equivalent system with known parameters by modifying the signal power and noise variance in a prescribed manner. Appli…
View article: Dynamically Reconfigurable Microwave Circuits Leveraging Abrupt Phase-Change Material
Dynamically Reconfigurable Microwave Circuits Leveraging Abrupt Phase-Change Material Open
This article proposes a concept for dynamically reconfigurable distributed\nmicrowave circuits by leveraging the abrupt conductivity transition in\nphase-change materials (PCM). Metallic surface-inclusions (<<$\\lambda$) are\nembedded in t…
View article: Training for Channel Estimation in Nonlinear Multi-Antenna Transceivers
Training for Channel Estimation in Nonlinear Multi-Antenna Transceivers Open
Recent efforts to obtain high data rates in wireless systems have focused on what can be achieved in systems that have nonlinear or coarsely quantized transceiver architectures. Estimating the channel in such a system is challenging becaus…
View article: A Compact, Wide Field-of-View Gradient-Index Lens Antenna for Millimeter-Wave MIMO on Mobile Devices
A Compact, Wide Field-of-View Gradient-Index Lens Antenna for Millimeter-Wave MIMO on Mobile Devices Open
Lens-based beam-forming antennas offer a low-power, low-cost alternative to\nhybrid beamforming antenna arrays. They are ideally suited to millimeter-wave\nmassive MIMO systems due to their native beam-space operation and angular\nselectiv…
View article: Silicon micromachined high-contrast artificial dielectrics for millimeter-wave transformation optics antennas
Silicon micromachined high-contrast artificial dielectrics for millimeter-wave transformation optics antennas Open
Transformation optics methods and gradient index electromagnetic structures\nrely upon spatially varied arbitrary permittivity. This, along with recent\ninterest in millimeter-wave lens-based antennas demands high spatial resolution\ndiele…
View article: RadioHound: A Pervasive Sensing Network for Sub-6 GHz Dynamic Spectrum Monitoring
RadioHound: A Pervasive Sensing Network for Sub-6 GHz Dynamic Spectrum Monitoring Open
We design a custom spectrum sensing network, called RadioHound, capable of tuning from 25 MHz to 6 GHz, which covers nearly all widely-deployed wireless activity. We describe the system hardware and network infrastructure in detail with a …