Navy

Design software for electrically small antennas

Simpler method and system for the design based on a low Q factor

Communications Software & Information Technology

In 1947, H.A. Wheeler published formulas that use the dimensions and the radiation of an antenna to define electrically small antennas. L. J. Chu followed up this formula with theories in addition to his own formulas that utilize the antenna’s size as a value to calculate other variables. Despite efforts by many, little expansion has been done on these topics since their initial publications. The new developments include solutions that were found to be too cumbersome to be considered a practical solution. As such, there is a need to find simpler methods to design more efficient electrically small antennas. This method provides that desired solution while creating ideal outputs based on user-defined inputs.

This novel method provides an algorithm to establish an ideal electrically small antenna using a simplified and condensed system. Instead of using the physical size or geometry of the antenna to derive the other ideal variables, this algorithm allows one to insert known values and provides an output of the ideal values for the remaining variables. One situation that follows this method uses the charge distribution to produce the appropriate antenna geometry to maintain the other provided values. After defining the desired charge distribution and running the software, it uses ideal values within known equations for a variety of shapes in which the antenna can be made. In cases where antennas require minimal quality factors, the geometry can be calculated rapidly. This algorithm allows for antennas to be built in the smallest size, while holding the necessary properties without having to manually calculate each possibility. The multiple variables allow for rapid comparisons of slightly different inputs.

As an example, at 1,063 feet, the Eiffel Tower is as high as some AM antennas. By using the patented method, Navy researchers designed and tested a 164-foot antenna model offering comparable performance to a 1,000 foot AM antenna.

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