An Energy-Synchronous Direct Antenna Modulation Method for Phase Shift Keying

Abstract

A novel scheme for transmitting broadband phase shift keyed signals from electrically small antennas using energy-synchronous direct antenna modulation is described. We outline fundamental operating principles of the method and experimentally compare its performance to that of a conventional band-limited transmit antenna with the same electrical size and radiation efficiency. Transmitted waveforms are analyzed in the time domain both at RF and baseband. Results show significant increases in signal quality, suggesting a larger effective transmit bandwidth and greater potential throughput when the proposed direct antenna modulation scheme is used.

Keywords

• Electrically small antennas
• direct modulation
• antenna measurements
• phase shift keying
• time-varying circuits