Title :
Triple-Tuning Small Antennas for Increased Bandwidth [Antenna Designer´s Notebook]
Author_Institution :
Electr. Eng. Dept., Univ. of South Carolina, Columbia, SC, USA
Abstract :
A method for designing a lossless network to triple tune an electrically small antenna is presented. This approach is based jointly upon Wheeler´s definition of the reflection coefficients at the edges of the band, and upon Fano´s criterion defining the maximum possible bandwidth. Examples are given for a small top-loaded antenna operated at two center frequencies, 175.5 MHz and 300 MHz, with values of Q equal to 100 and 19, respectively.
Keywords :
UHF antennas; VHF antennas; Fano criterion; electrically small antenna; frequency 175.5 MHz; frequency 300 MHz; lossless network; reflection coefficients; small top-loaded antenna; triple-tuning small antennas; Antenna measurements; Bandwidth; Equivalent circuits; Impedance; Loss measurement; Resistance; Tuning; Electrically small antennas; high Q circuits; impedance matching; increasing bandwidth;
Journal_Title :
Antennas and Propagation Magazine, IEEE
DOI :
10.1109/MAP.2012.6309176
