Quasi-static Design of Electrically Small Ultra-Wideband Antennas

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.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2017
Accession Number
AD1027855

Entities

People

  • Thomas Iii O. Jones

Organizations

  • Naval Information Warfare Systems Command

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Algorithms
  • Broadband Antennas
  • Charge Density
  • Department Of Defense
  • Electric Fields
  • Electrically Small Antennas
  • Electromagnetic Fields
  • Frequency
  • Geometry
  • Governments
  • Q Factor
  • Radiation
  • Radiation Resistance
  • Standing Wave Ratios
  • Standing Waves
  • Transmission Lines
  • United States Government

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Mathematics or Statistics
  • Microwave Engineering.