TY - GEN
T1 - Suppression of field projection error in EPA at low frequencies by augmentation method
AU - Sun, L. E.
AU - Chew, W. C.
AU - Jin, J. M.
PY - 2010
Y1 - 2010
N2 - Equivalence principle algorithm (EPA) using the high-order field point sampling scheme [1] has low frequency breakdown problem when the frequency becomes very low [2]. The low frequency problem is usually remedied by the loop-tree decomposition method [3]. However, this method suffers from the need to search for loops. Finding loops for the subdomains in EPA, especially for connected subdomains cases, becomes very involved. In recent years, researchers have proposed the current and charge equations for low frequency breakdown problems [4, 5, 6]. These methods can improve the conditioning of the matrix equations. Moreover, they are not burdened by loop search. This paper proposes an augmented EPA formulation. It introduces charge density unknowns on the equivalence surface (ES). Hence, the low frequency breakdown of field projection operators in EPA is removed. The new augmented scheme is stable in a wide frequency range.
AB - Equivalence principle algorithm (EPA) using the high-order field point sampling scheme [1] has low frequency breakdown problem when the frequency becomes very low [2]. The low frequency problem is usually remedied by the loop-tree decomposition method [3]. However, this method suffers from the need to search for loops. Finding loops for the subdomains in EPA, especially for connected subdomains cases, becomes very involved. In recent years, researchers have proposed the current and charge equations for low frequency breakdown problems [4, 5, 6]. These methods can improve the conditioning of the matrix equations. Moreover, they are not burdened by loop search. This paper proposes an augmented EPA formulation. It introduces charge density unknowns on the equivalence surface (ES). Hence, the low frequency breakdown of field projection operators in EPA is removed. The new augmented scheme is stable in a wide frequency range.
UR - https://www.scopus.com/pages/publications/78349263445
UR - https://www.scopus.com/pages/publications/78349263445#tab=citedBy
U2 - 10.1109/APS.2010.5561965
DO - 10.1109/APS.2010.5561965
M3 - Conference contribution
AN - SCOPUS:78349263445
SN - 9781424449682
T3 - 2010 IEEE International Symposium on Antennas and Propagation and CNC-USNC/URSI Radio Science Meeting - Leading the Wave, AP-S/URSI 2010
BT - 2010 IEEE International Symposium on Antennas and Propagation and CNC-USNC/URSI Radio Science Meeting - Leading the Wave, AP-S/URSI 2010
T2 - 2010 IEEE International Symposium on Antennas and Propagation and CNC-USNC/URSI Radio Science Meeting - Leading the Wave, AP-S/URSI 2010
Y2 - 11 July 2010 through 17 July 2010
ER -