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 : https://apps.dtic.mil/dtic/tr/fulltext/u2/1027855.pdf


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