TY - GEN
T1 - Full-wave analysis of HF antennas on helicopters using the FDTD, FEM & NEC
AU - Georgakopoulos, Stavros V.
AU - Polycarpou, Anastasis C.
AU - Balanis, Constantine A.
N1 - Publisher Copyright:
© 1999 IEEE.
PY - 1999
Y1 - 1999
N2 - To first analyze and eventually try to achieve an optimum design of an HF antenna on a helicopter in free space is a difficult task. The reason is twofold: first, there are many parameters that could be possibly varied; second, accurate numerical methods which can handle large computational problems must be implemented. In this paper, three different numerical methods are presented to predict the input impedance and radiation patterns of scaled HF antennas mounted on a scaled helicopter model. These include the finite-difference time-domain (FDTD) method, the finite element method (FEM) and the method of moment (MoM), specifically the NEC4 code. Predictions are sometimes compared with each other and/or with measurements. In addition to a large computational size, another major challenge for all these methods is the highly resonant nature of these antennas, loops or inverted-L's, which makes the overall problem ill-conditioned. The advantages and disadvantages of each method, in relation to the analysis of HF antennas in the presence of geometrically complex structures, are emphasized.
AB - To first analyze and eventually try to achieve an optimum design of an HF antenna on a helicopter in free space is a difficult task. The reason is twofold: first, there are many parameters that could be possibly varied; second, accurate numerical methods which can handle large computational problems must be implemented. In this paper, three different numerical methods are presented to predict the input impedance and radiation patterns of scaled HF antennas mounted on a scaled helicopter model. These include the finite-difference time-domain (FDTD) method, the finite element method (FEM) and the method of moment (MoM), specifically the NEC4 code. Predictions are sometimes compared with each other and/or with measurements. In addition to a large computational size, another major challenge for all these methods is the highly resonant nature of these antennas, loops or inverted-L's, which makes the overall problem ill-conditioned. The advantages and disadvantages of each method, in relation to the analysis of HF antennas in the presence of geometrically complex structures, are emphasized.
UR - http://www.scopus.com/inward/record.url?scp=85039935856&partnerID=8YFLogxK
U2 - 10.1109/APS.1999.789494
DO - 10.1109/APS.1999.789494
M3 - Conference contribution
AN - SCOPUS:85039935856
T3 - IEEE Antennas and Propagation Society International Symposium: Wireless Technologies and Information Networks, APS 1999 - Held in conjunction with USNC/URSI National Radio Science Meeting
SP - 1058
EP - 1061
BT - IEEE Antennas and Propagation Society International Symposium
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 1999 IEEE Antennas and Propagation Society International Symposium, APSURSI 1999
Y2 - 11 July 1999 through 16 July 1999
ER -