Distortion Analysis for the Assessment of LTI and NonLTI 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 timeinvariant (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 bandwidthefficiency product. These expressions are shown to agree with results obtained using narrowband single resonance approximations, allowing for the analysis of arbitrary small dipolelike structures through bounds on their single frequency Qfactor and efficiency. The resulting expressions are used as a basis for assessing the performance gains of electrically small nonLTI (e.g., direct antenna modulation) transmitters for which Qfactor and impedance bandwidth are not defined but which can be analyzed directly in the time domain via distortion.
 Publication:

IEEE Transactions on Antennas and Propagation
 Pub Date:
 July 2020
 DOI:
 10.1109/TAP.2020.2980355
 arXiv:
 arXiv:1907.04354
 Bibcode:
 2020ITAP...68.5209S
 Keywords:

 Physics  Applied Physics
 EPrint:
 8 pages, 8 figures