Title :
Frequency tuning of an electrically small antenna for HF ground wave transmission
Author :
Lim, S. ; Rogers, R.L. ; Ling, H.
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX
Abstract :
In this paper, the methods are investigated to change the resonant frequency of our electrically small antenna using tunable lumped-element components. While the instantaneous bandwidth of the antenna cannot be improved in this manner, a tunable antenna can achieve frequency agility necessary to overcome various deployment variances and propagation effects. The location for the placement of the lumped element is evaluated via simulation using the numerical electromagnetics code (NEC). The simulation result is compared with the measured data at the optimal location. Results for the tuning range and tuning sensitivity are reported
Keywords :
HF antennas; HF radio propagation; bandwidth allocation; electromagnetic wave transmission; HF ground wave transmission; electrically small antenna; frequency tuning; instantaneous bandwidth; numerical electromagnetics code; resonant frequency; tunable antenna; tunable lumped-element components; tuning sensitivity; Antenna accessories; Antennas and propagation; Bandwidth; Electromagnetic propagation; Hafnium; National electric code; Numerical simulation; Resonant frequency; Transmitting antennas; Tuning;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2005 IEEE
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-8883-6
DOI :
10.1109/APS.2005.1551473
