Title :
On using the classical monopole for comparison with other electrically small self-resonant monopole antennas of equal height
Author :
Walden, Marcus C.
Author_Institution :
Plextek Ltd., Great Chesterford, UK
Abstract :
The paper shows that the Q-factor and VSWR of a monopole antenna are significantly lowered when made resonant by reactive loading (as is used in practice). Comparison with a self-resonant Koch fractal monopole of equal height gives similar values of VSWR and Q-factor. Thus, the various electrically small monopoles (self-resonant and reactively loaded) offer comparable performance when ideal and lossless. However, in selecting the optimum design, conductor losses and mechanical construction at the frequency of interest must be considered. In essence, an engineering trade-off is necessary to obtain an efficient, electrically small antenna suitable for the application in hand.
Keywords :
Q-factor; antenna theory; electric impedance; fractals; monopole antennas; Koch fractal monopole; Q-factor; VSWR; conductor losses; electrically small monopoles; feed-point impedance; mechanical construction; monopole antennas; reactive loading; self-resonant antennas; Antenna feeds; Conductors; Fractals; Genetic algorithms; Helical antennas; Impedance; Loaded antennas; Q factor; Resonance; Shape;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Conference_Location :
Columbus, OH, USA
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1217457