High-Frequency Active Transmit/Receive Antenna

HRL has been developing an active antenna that overcomes the Bode-Fano bandwidth-efficiency limitations on both Transmit (TX) and Receive (RX) in the HF (3-30 MHz) band. The TX mode uses a switch-mode Radio Frequency Current Source (RFCS) amplifier to efficiently drive a 1-m normal mode helix beyond...

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Bibliographic Details
Published in:	2024 IEEE International Symposium on Antennas and Propagation and INC/USNC‐URSI Radio Science Meeting (AP-S/INC-USNC-URSI) pp. 2397 - 2398
Main Authors:	White, Carson R., Ramos, Ignacio, Bracy, Gregory, DeBoy, Jonathan K., Song, Hyok J., Austin, Liam, Yang, Louis, Mitchell, Alexandra S., McWhortel, Tyler, Schlomann, Evan A., Garcia, Frank E., Lee, Hanseung, Krieger, James D.
Format:	Conference Proceeding
Language:	English
Published:	IEEE 14-07-2024
Subjects:	Helical antennas Phase shift keying Receiving antennas Resonance Sensitivity Switches Transmitting antennas
Online Access:	Get full text
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Summary:	HRL has been developing an active antenna that overcomes the Bode-Fano bandwidth-efficiency limitations on both Transmit (TX) and Receive (RX) in the HF (3-30 MHz) band. The TX mode uses a switch-mode Radio Frequency Current Source (RFCS) amplifier to efficiently drive a 1-m normal mode helix beyond its natural resonance. The RX mode uses a high impedance buffer, together with the resonant matching network, to enable wideband reception. This paper presents a TX demonstration delivering QPSK to a dummy load with 5-10x more bandwidth-efficiency product than the Bode-Fano limit, and an RX demonstration with > 13 dB higher receive sensitivity than a narrowband conjugate match over most of the HF band.
ISSN:	1947-1491
DOI:	10.1109/AP-S/INC-USNC-URSI52054.2024.10686762