Title :
Numerical analysis of copper sheet RF antenna by two-dimensional moment method
Author :
Lai, Kinin ; Jiang, Xiaohua
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
A two-dimensional (2D) moment method (MOM) based on the thin wire formulation is proposed for the analysis of a radiofrequency (RF) transmit antenna made of copper sheet that is used in permanent magnetic resonance imaging (MRI). The antenna is approximated by a two-dimensional wire grid model and the integral equation is used to calculate the current distribution. To evaluate the proposed method a harmonics analysis module (HA) of ANSYS is also used. Calculation results by the 2D MOM show that the current distribution agrees with that by the HA of ANSYS within the field range of permanent MRI. A flat D-shaped antenna has been built and measured results of its input impedances are presented. Good agreement has been obtained between calculated and measured data.
Keywords :
antenna theory; copper; current distribution; electric impedance; integral equations; magnetic resonance imaging; method of moments; transmitting antennas; 2D MOM; ANSYS; MRI; RF transmit antenna; copper sheet RF antenna; current distribution; flat D-shaped antenna; harmonics analysis module; input impedances; integral equation; numerical analysis; permanent magnetic resonance imaging; radiofrequency transmit antenna; thin wire formulation; two-dimensional moment method; two-dimensional wire grid model; Antenna measurements; Copper; Current distribution; Magnetic field measurement; Magnetic resonance imaging; Message-oriented middleware; Moment methods; Numerical analysis; Radio frequency; Wire;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2004. IEEE
Print_ISBN :
0-7803-8302-8
DOI :
10.1109/APS.2004.1330205
