Quasi-static Design of Electrically Small Ultra-Wideband Antennas
Space and Naval Warfare Systems Center Pacific San Diego United States
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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 Chus 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.
- Electrical and Electronic Equipment