Broadening the Efficiency Bandwidth Product of Electrically small Antenna through Direct Antenna Modulation (DAM) Transmitting
Abstract
This STIR proposal is to demonstrate high efficiency broadband HF transmission based on the novel concept of Direct Antenna Modulations (DAM). The proposed effort takes a system approach rather than isolated antenna design to attack the famous Chu-HarringtonÕs limit e.g. the limit of efficiency bandwidth product, associated with electrically small antennas or radiation platforms. The effort will bring forth innovations on both the operating principles and hardware architectures of HF transmitters. On the transmitter operating principles, the proposed efforts utilize the nonlinear, dynamic nature of device-antenna interactions to achieve antenna performance beyond conventional limits. It has been demonstrated that a high-speed switch can change the nature of a narrow-band resonant antenna to a high-speed pulse radiator. The so-called switched-mode antenna is capable of breaking the bandwidth limit of a high-Q system in a direct antenna modulation manner by introducing nonlinear dynamics in a synchronized fashion with the RF carrier to be transmitted. Circuit simulations and preliminary experiments have demonstrated that the efficiency bandwidth product limit of electrically small loop antennas can now be surpassed.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Dec 04, 2018
- Source ID
- W911NF1610428
Entities
People
- Yuanxun Wang
Organizations
- Army Contracting Command
- United States Army
- University of California, Los Angeles