Resonance Behaviors of Time-Varying Spherical Scatterers

Kerby-Patel, K. C.; Schab, Kurt

doi:10.1109/ap-s/usnc-ursi47032.2022.9887059

Cited by 1 publication

(1 citation statement)

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“…We adapt the classical approach to antenna noise temperature to the case of a time-varying antenna using a generalized cross-frequency formulation of effective aperture. This generalized effective aperture approach is compatible with full-wave time-varying electromagnetic analysis via conversion-matrix / harmonic balance methods [24], frequency-domain co-simulation [21, §6.1] and covariancebased noise models [25], [26], abstract models of timemodulated arrays, and transient simulations. Assumptions regarding signal incidence and external noise are introduced throughout the text, with emphasis placed on following those used in the standard derivation of antenna noise temperature.…”

Section: Introductionmentioning

confidence: 99%

Scattering Properties of Spherical Time-Varying Conductive Shells

Schab

Shirley

Kerby-Patel

2022

IEEE Trans. Antennas Propagat.

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The equivalent external noise temperature of timevarying antennas is studied using the concept of cross-frequency effective aperture, which quantifies the intermodulation conversion of external noise across the frequency spectrum into a receiver's operational bandwidth. The theoretical tools for this approach are laid out following the classical method for describing external noise temperature of linear time-invariant antennas, with generalizations made along the way to capture the effects of time-varying components or materials. The results demonstrate the specific ways that a time-varying system's noise characteristics are dependent on its cross-frequency effective aperture and the broadband noise environment. The general theory is applied to several examples, including abstract models of hypothetical systems, antennas integrated with parametric amplification, and time-modulated arrays.

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Section: Introductionmentioning

confidence: 99%