Equivalent External Noise Temperature of Time-Varying Receivers

The equivalent external noise temperature of time-varying 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 f...

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Bibliographic Details
Published in:arXiv.org 2024-06
Main Authors: Schab, Kurt, Kerby-Patel, K C
Format: Article
Language:English
Subjects:
Antennas
Apertures
Broadband
Equivalence
Frequency spectrum
Intermodulation
Noise temperature
Online Access:Get full text
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Summary:The equivalent external noise temperature of time-varying 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.
ISSN:2331-8422