@inproceedings{oai:nagasaki-u.repo.nii.ac.jp:00018357,
 author = {Yagyu, Daisuke and Tanaka, Kazumasa and Fujimoto, Takafumi and Taguchi, Mitsuo},
 book = {IEEE Antennas and Propagation Society, AP-S International Symposium 1999},
 month = {Jun},
 note = {An oblate spheroidal antenna (OSA) has been proposed to widen the beamwidth of microstrip antennas (MSA). OSA consists of a linearly polarized circular patch MSA inserted between oblate spheroidal conductors. The electromagnetic fields within the MSA are expressed as the summation of modal functions in the cylindrical coordinate system. Their unknown coefficients and the equivalent electric and magnetic currents on antenna surface are determined by the magnetic field integral equation on the aperture of the substrate and the electric field integral equation on the conductor surface. The antenna beamwidth becomes wider and the resonant frequency decreases as the conductor height increases., text, IEEE Antennas and Propagation Society International Symposium 1998, Atlanta, Georgia June 21-26, 1998, Proc. of 1998 IEEE Antennas and Propagation Society International Symposium, Vol. 1, pp. 324-327, June 1998.},
 pages = {324--327},
 publisher = {IEEE},
 title = {Analysis of rotationally symmetrical antenna with wider beamwidth},
 volume = {1},
 year = {1998}
}