2021 article
DC-Assisted Stabilization of Internal Oscillations for Improved Symbol Transitions in a Direct Antenna Modulation Transmitter
Huang, D., Schab, K., Dusenbury, J. K., Sluss, B., & Adams, J. J. (2021, August 13). IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES.
author keywords: Dams; Antennas; Oscillators; Switches; Transmitting antennas; Integrated circuit modeling; Antenna measurements; Direct antenna modulation (DAM); electrically small antennas (ESAs); parasitic circuit model; time-varying circuits
TL;DR:
Measured phase shift keyed waveforms transmitted using the modified direct antenna modulation system with an auxiliary DC source show significant increases in signal fidelity, including a 10–20-dB reduction in error vector magnitude compared to a time-invariant system.
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Source: Web Of Science
Added: January 3, 2022
Internal oscillations in switched antenna transmitters cause undesirable fluctuations of the stored energy in the system, reducing the effectiveness of time-varying broadbanding methods, such as energy-synchronous direct antenna modulation. To mitigate these parasitic oscillations, a modified direct antenna modulation system with an auxiliary DC source is introduced to stabilize energy storage on the antenna. A detailed circuit model for a direct antenna modulation system is used to identify the origin of the oscillations and to justify the selection of the DC source. Measured phase shift keyed waveforms transmitted using the modified system show significant increases in signal fidelity, including a 10–20-dB reduction in error vector magnitude compared to a time-invariant system. Comparison to an equivalent, scalable time-invariant antenna suggests that the switched transmitter behaves as though it has 2–3 times lower radiation Q-factor and 20% higher radiation efficiency.