Title :
LF antenna optimization over high impedance ground plane
Author :
Rodriguez, Alberto ; Hansen, Peder ; Koyama, Lance ; Ding, Qian ; Lomakin, Vitaliy
Author_Institution :
SPAWAR Syst. Center Pacific, San Diego, CA, USA
Abstract :
This paper discusses the approach to make use of the four towers in the existing Sectionalized Loran Transmitting (SLT) antennas. Various configurations have been investigated to operate at lower frequency with reasonable behavior. Upward radiation is desired so horizontal polarization is used. A High Impedance Surface (HIS) is introduced between the antenna and the ground plane to improve performance at low frequency. The HIS is studied for several different antenna types (smaller than SLT) operated at 100 KHz, Several kinds of modification are made to the HIS to optimize performance. Combined with Electrical Small Antenna (ESA) the HIS with capacitive loading turns out to improve performance, giving wider bandwidth and efficiency enhancement.
Keywords :
antenna radiation patterns; electromagnetic wave polarisation; transmitting antennas; HIS; LF antenna optimization; SLT antennas; electrical small antenna; frequency 100 kHz; high impedance ground plane; high impedance surface; horizontal polarization; sectionalized Loran transmitting antennas; towers; upward radiation; Bandwidth; Dipole antennas; Impedance; Loading; Resistance; Surface impedance;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2012 IEEE
Conference_Location :
Chicago, IL
Print_ISBN :
978-1-4673-0461-0
DOI :
10.1109/APS.2012.6349379
