Accession Number : AD1027855

Title :   Quasi-static Design of Electrically Small Ultra-Wideband Antennas

Descriptive Note : Technical Report

Corporate Author : Space and Naval Warfare Systems Center Pacific San Diego United States

Personal Author(s) : Jones ,Thomas III O

Full Text :

Report Date : 01 Feb 2017

Pagination or Media Count : 39

Abstract : The ultra wideband (UWB) antenna shape determines both the lowest operating frequency and Q-factor ratio. For electrically small antennas, the quasi-static antenna design algorithm can be used to design very low Q-factor ratio antennas with high bandwidth [4, 5]. The Q-factor ratio is the coefficient of the largest term in Chu's limit, the right side of Equation (1) [7]. Lowering the Q-factor ratio reduces the Q-factor for the electrically small part of the frequency range. The UWB antenna shape in the quasi-static antenna design algorithm is a cone with an attached bulb. The lowest operational frequency is reduced without increasing the voltage standing wave ratio (VSWR) at higher frequencies. This is a physics-based algorithmic approach that avoids the typical cut-and-try method.

Descriptors :   Antennas

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE