79 citations · 128 across the 4 of their papers we have counts for
4 papers
Analytic approximations of scattering effects on beam chromaticity in 21-cm global experiments
Alan E. E. Rogers, John P. Barrett, Judd D. Bowman +6
Scattering from objects near an antenna produce correlated signals from strong compact radio sources in a manner similar to those used by the Sea Interferometer to measure the radi…
A Bayesian approach to modelling spectrometer data chromaticity corrected using beam factors -- I. Mathematical formalism
Peter H. Sims, Judd D. Bowman, Nivedita Mahesh +7
Accurately accounting for spectral structure in spectrometer data induced by instrumental chromaticity on scales relevant for detection of the 21-cm signal is among the most signif…
VLBI measurement of the vector baseline between geodetic antennas at Kokee Park Geophysical Observatory, Hawaii
A. E. Niell, J. P. Barrett, R. J. Cappallo +6
We measured the components of the 31-m-long vector between the two Very-Long-Baseline Interferometry (VLBI) antennas at the Kokee Park Geophysical Observatory (KPGO), Hawaii, with…
Phase Conjugation and Negative Refraction Using Nonlinear Active Metamaterials
Alexander R. Katko, Shi Gu, John P. Barrett +3
We present experimental demonstration of phase conjugation using nonlinear metamaterial elements. Active split-ring resonators loaded with varactor diodes are demonstrated theoreti…