Title :
Design of ultra-broadband loaded monopoles
Author :
Bahr, M. ; Boag, A. ; Michielssen, E. ; Mittra, R.
Author_Institution :
Electromagn. Commun. Lab., Illinois Univ., Urbana, IL, USA
Abstract :
The authors develop two approaches for the design of ultra-broadband loaded monopole antennas for spread-spectrum communication. The first of these, designated as the conventional design, utilizes several parallel L-C circuits that are initially placed along the monopole such that the effective electrical length of the antenna remains approximately one-quarter wavelength over the frequency range of interest. This method is based upon a two step procedure: (1) design a loaded antenna that meets the gain requirements; and, (2) devise its matching network to obtain the desired VSWR. The second method uses a genetic algorithm to design both the loaded monopole and the matching network simultaneously in an optimal manner.<>
Keywords :
electric impedance; genetic algorithms; monopole antennas; radio equipment; spread spectrum communication; 30 to 450 MHz; design; effective electrical length; gain requirements; genetic algorithm; matching network; parallel L-C circuits; two step procedure; ultra-broadband loaded monopoles; Algorithm design and analysis; Circuit testing; Electromagnetic radiation; Genetic algorithms; Impedance; Laboratories; Loaded antennas; RLC circuits; Resistors; Resonant frequency;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1994. AP-S. Digest
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-7803-2009-3
DOI :
10.1109/APS.1994.407853
