Skip to main content

Efficiency improvements of a Directly-Driven Antenna-based AM transmitter over the am frequency band

Publication ,  Journal Article
Olaode, OO; Palmer, WD; Joines, WT
Published in: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)
2011

A wide frequency bandwidth and high power efficiency are important goals of radio transmitter design. Conventional radio transmitters have a narrow bandwidth, primarily limited by the bandwidth of the impedance matching network between the power amplifier and transmit antenna. The Directly-Driven Antenna (DDA) architecture has the potential to eliminate this limitation, as without the frequency constraints imposed by the conjugate impedance matching network, it is possible to couple power to a transmit antenna efficiently across a very wide bandwidth. Previous work demonstrates that the DDA architecture can produce an improvement by a factor of 10 in the radiated power for an electrically-small antenna when compared to conventional transmitter architecture. Results obtained over the past year, incorporating changes to the DDA circuit and measurement techniques reported previously, confirms that the radiated power improvement is close to a factor of 10 at 1 MHz but changes with frequency. This letter discusses recent refinements made to the circuit design, measurement technique and results, and shows data demonstrating operation of a DDA transmitter across the AM broadcast band. © 2011 IEEE.

Duke Scholars

Published In

IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)

DOI

ISSN

1522-3965

Publication Date

2011

Start / End Page

1372 / 1374
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Olaode, O. O., Palmer, W. D., & Joines, W. T. (2011). Efficiency improvements of a Directly-Driven Antenna-based AM transmitter over the am frequency band. IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), 1372–1374. https://doi.org/10.1109/APS.2011.5996546
Olaode, O. O., W. D. Palmer, and W. T. Joines. “Efficiency improvements of a Directly-Driven Antenna-based AM transmitter over the am frequency band.” IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), 2011, 1372–74. https://doi.org/10.1109/APS.2011.5996546.
Olaode OO, Palmer WD, Joines WT. Efficiency improvements of a Directly-Driven Antenna-based AM transmitter over the am frequency band. IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). 2011;1372–4.
Olaode, O. O., et al. “Efficiency improvements of a Directly-Driven Antenna-based AM transmitter over the am frequency band.” IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), 2011, pp. 1372–74. Scival, doi:10.1109/APS.2011.5996546.
Olaode OO, Palmer WD, Joines WT. Efficiency improvements of a Directly-Driven Antenna-based AM transmitter over the am frequency band. IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). 2011;1372–1374.

Published In

IEEE Antennas and Propagation Society, AP-S International Symposium (Digest)

DOI

ISSN

1522-3965

Publication Date

2011

Start / End Page

1372 / 1374