53 citations · 92 across the 10 of their papers we have counts for
10 papers
High-frequency Limits for 3D-Printed Gradient-index (GRIN) Lens Antennas
Wei Wang, Philip Lambert, Jonathan Chisum
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 d…
A Training-Based Mutual Information Lower Bound for Large-Scale Systems
Xiangbo Meng, Kang Gao, Bertrand M. Hochwald
We provide a mutual information lower bound that can be used to analyze the effect of training in models with unknown parameters. For large-scale systems, we show that this bound c…
The Systematic Design of Non-commensurate Impedance Matching Tapers for Ultra Wideband Gradient-Index (GRIN) Lens Antennas
Wei wang, Nicolas Garcia, Jonathan Chisum
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 ma…
Training-Based Equivalence Relations in Large-Scale Quantized Communication Systems
Kang Gao, Xiangbo Meng, J. Nicholas Laneman +4
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 si…
High-efficiency, Wideband GRIN Lenses with Intrinsically Matched Unit-cells
Nicolas Garcia, Jonathan Chisum
We present an automated design procedure for the rapid realization of wideband millimeter-wave lens antennas. The design method is based upon the creation of a library of matched u…
Dynamically Reconfigurable Microwave Circuits Leveraging Abrupt Phase-Change Material
David Connelly, Jonathan Chisum
This article proposes a concept for dynamically reconfigurable distributed microwave circuits by leveraging the abrupt conductivity transition in phase-change materials (PCM). Meta…
Training for Channel Estimation in Nonlinear Multi-Antenna Transceivers
Kang Gao, J. Nicholas Laneman, N. J. Estes +2
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. Es…
Silicon Micromachined High-contrast Artificial Dielectrics for Millimeter-wave Transformation Optics Antennas
Nicolas Garcia, Wenlong Bai, Thibault Twahirwa +2
Transformation optics methods and gradient index electromagnetic structures rely upon spatially varied arbitrary permittivity. This, along with recent interest in millimeter-wave l…
A Compact, Wide Field-of-View Gradient-index Lens Antenna for Millimeter-wave MIMO on Mobile Devices
Wenlong Bai, Jonathan Chisum
Lens-based beam-forming antennas offer a low-power, low-cost alternative to hybrid beamforming antenna arrays. They are ideally suited to millimeter-wave massive MIMO systems due t…
RadioHound: A Pervasive Sensing Network for Sub-6 GHz Dynamic Spectrum Monitoring
Nikolaus Kleber, Jonathan Chisum, Aaron Striegel +5
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 s…