Distortion Analysis for the Assessment of LTI and non-LTI Transmitters

Abstract

Bounds on the frequency domain behavior of electrically small antennas are adapted to assess the time domain distortion or fidelity achievable by simple linear time-invariant (LTI) systems. Rigorous expressions for a TM${}_{01}$ spherical shell are used as a direct analog to the well known Chu limit on an antenna's bandwidth-efficiency product. These expressions are shown to agree with results obtained using narrowband single resonance approximations, allowing for the analysis of arbitrary small dipole-like structures through bounds on their single frequency Q-factor and efficiency. The resulting expressions are used as a basis for assessing the performance gains of electrically small non-LTI (e.g., direct antenna modulation) transmitters for which Q-factor and impedance bandwidth are not defined but which can be analyzed directly in the time domain via distortion.

8 pages, 8 figures

References in corpus (5)

• Beyond the Bode-Fano Bound: Wideband Impedance Matching for Short-Pulses using Temporal Switching of Transmission-Line Parameters
• Fundamental Efficiency Limits for Small Metallic Antennas
• Minimization of Antenna Quality Factor
• Trade-off Between Antenna Efficiency and Q-Factor
• Energy Stored by Radiating Systems

Cited by in corpus (2)

• Radiation Efficiency Limits in Direct Antenna Modulation Transmitters
• DC-Assisted Stabilization of Internal Oscillations for Improved Symbol Transitions in a Direct Antenna Modulation Transmitter