The effect of blow-down on the effective height of a helicopter supported VLF high-wire antenna
Coates, Dannie R.
Menneken, Carl E.
MetadataShow full item record
The use of the very-low-frequency segment of the electromagnetic spectrum has been limited by the fact that practical VLF antennas are electrically short. It has been proposed that a helicopter be used to support a vertical radiator at heights of 7000 to 10,000 feet. This would give the antenna dimensions of the same order of magnitude as a quarter-wavelength. In general, the antennas will assume the shape of a centenary curve due to the wind forces acting on the cable. The equations that describe the antenna of general physical shape are presented and an analysis is given of the effects of the curvature on the effective height and radiation resistance of the antenna. Calculated data is presented to show how the antenna shape may be optimized in order to maximize the antenna's effective height.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Lebaric, J.; Ah-Tuan Tan (2000);This paper presents the development of an ultra-wideband (300 to 3000 MHz), vertically polarized, nearly omni-directional (in azimuth) communications antenna integrated into the camouflage cover of a standard military-issue ...
Lyberopoulos, George L. (Monterey, California: U.S. Naval Postgraduate School, 1986-06); NPS-62-86-006There are many shipboard communication antenna problems where the number, type, location, or survivability of a given antenna in the system is a parameter which can be varied to determine the overall optimal system. This ...
Gibson, Thad B. (Monterey, California. Naval Postgraduate School, 1995-09);This thesis presents a propagation study and antenna design for the Micro-Remotely Powered Vehicle (MRPV). A propagation loss study was conducted to determine the attenuation of various building walls and to select an ...