Energy Efficient HF Transmit Antennas Navy STTR FY2012.A Sol No.: Navy STTR FY2012.A Topic No.: N12A-T015 Topic Title: Energy Efficient HF Transmit Antennas Proposal No.: N12A-015-0134 Firm: Pharad LLC 797 Cromwell Park Drive, Suite V Glen Burnie, Maryland 21061-2540 Contact: Rodney Waterhouse Phone: (410) 590-3333 Web Site: www.pharad.com Abstract: In this N12A-T015 Phase I effort, the team of Pharad and UCLA (University of California, Los Angeles) propose to develop a highly efficient High Frequency (HF) transmit antenna based on utilizing existing structures that are available in the surrounding environment, as radiation mechanisms. We propose to create antennas on existing structures or other parts of the platform using either of two strategies: (i) by developing efficient antenna `exciters' that can efficiently couple power to existing metallic structures (such as fences, roofs, posts and drain-pipes or even vehicles, hull plates and armor); and (ii) by incorporating conductive paints that can be applied to walls and other non-metallic structures. By utilizing these techniques we believe we can resolve the fundamental issue of developing an efficient HF antenna that is not unwieldy and can be readily transported. We also plan to investigate how to interconnect these potential HF radiators using sparse array concepts to further enhance the overall efficiency. Throughout Phase I we will undertake experimental investigations when appropriate. The Phase I design activities will lay the foundations for the proposed Phase II effort, the focus of which will be to develop a proof-of-concept version of our proposed efficient HF transmit antenna system. Benefits: The highly efficient HF antenna technology that will be developed through this program will play an important role in many military tactical communications systems, providing a versatile capability for both short- and long-range communication links. In addition to having US Navy application, we expect interest from other users in the DoD including the US Army and SOCOM. The novel HF antenna technology will also find use in the activities of first responders in disaster response applications where communications is critical. Return