1King H E, Wong J L. Characteristics of 1 to 8 wavelength uniform helical antennas[J]. IEEE Trans Ant Propag, 1980, 28: 291-296.
2Nakano H, Junji Y, Mimaki H. Backfire radiation from a monofilar helix with a small ground plane[J]. IEEE Trans Ant Propag,1988, 36(10): 1359-1364.
3Emerson D T. Antenna compendium volume 4 [M]. USA: ARRL, 1995.
4Richie J E,Gangl H R III. EFIE-MFIE hybrid simulation using NEC:VSWR for the WISP experiment[J]. IEEE Trans on Electromag Compat, 1995, 37(2): 293-296.
5Peng J,Balanis C A,Barber G C. NEC and ESP codes: guidelines, limitations, and EMC applications[J]. IEEE Trans on Electromag Compat,1993, 35(2): 125-133.
6Weile D S, Michielssen E. Genetic algorithm optimization applied to electromagnetics: a review[J]. IEEE Trans Ant Propag, 1997, 45(3): 343-353.
