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.
Highlights
A NTENNAS face fundamental limits in their minimum radiation Q-factor as their electrical size decreases, e.g., the well-known Chu bound for spherical shells [1]
Transmission schemes that rely on time variant modulation of the antenna or matching network are referred to as direct antenna modulation (DAM)
Though we demonstrate specific cases of binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) in this paper, the proposed method is capable of producing arbitrary phase shifts at high baud rate
Summary
A NTENNAS face fundamental limits in their minimum radiation Q-factor (and maximum bandwidthefficiency product) as their electrical size decreases, e.g., the well-known Chu bound for spherical shells [1] This makes transmitting wideband signals difficult using electrically small antennas because the signals are inherently bandlimited by the undesired bandpass nature of the antenna’s impedance match. The more promising of these schemes function by storing and releasing energy in the antenna and matching network in synchronization with the digital waveform being transmitted to facilitate rapid transitions between different symbol states. In this paper we describe, analyze, and measure the radiated far field behavior of a direct antenna modulation-based transmitter for phase shift keying. SCHAB et al.: ENERGY-SYNCHRONOUS DIRECT ANTENNA MODULATION METHOD FOR PHASE SHIFT KEYING field characterization are described and the results are analyzed
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
