Retractable Man-packable TACAN Antenna

Current electronically scanned TACAN antennas, such as the AS-3240(A) and AS-4802, produce the 15 Hz modulation by elements which are very close to the center radiator. The 135 Hz modulation is produced by elements which are located at a considerably further distance specified by the Bessel function. There is a large amount of empty space between these sets of modulation elements which have historically been fixed to a rigid base plate. The existing rigid base plate and frame adds significant weight and volume, which have prevented these antennas from being Man-packable to date. dB Systems proposes a Man-packable TACAN Antenna utilizing the current design and adding modifications to develop a foldable frame using ultra-lightweight materials. The frame would fold onto itself greatly reducing required volume during antenna transportation. The folding research and development would have to be carefully considered to prevent unwanted RF reflections from hinges, seams, or other pivot points. While designs with detachable pieces may be considered, the majority of the design should be part of one folding frame for rapid antenna setup and takedown (15 minutes or less). There are a variety of existing hi-tech fasteners that could be implemented; however, independent of the method used, the folded version would ultimately fit in a backpack. For use, the antenna would fold out to match the functioning spatial requirements of current fully deployed and approved electrically scanned antennas in operation. Beacon Transponders have typically been larger and heavier than what is desired in this opportunity. Primarily, the size has been driven by high power output due to range requirements. For this approach we propose to reduce the power output to a minimum level required to achieve the requested service volume, then repackage the equipment into a unit smaller and lighter than previously realized. This portion of the research will be completed by a known leader in TACAN Beacon design and manufacturing: Moog Inc.