Do-Hoon KwonChang, Hsieh-chi2024-04-262012-08-292012-09910.7275/3275174https://hdl.handle.net/20.500.14394/47832The radiation quality factor of small vertically polarized antennas above a ground plane is investigated. Although the quality factor of small antennas in free space has been investigated extensively in the past, the exact effect of a conducting ground plane on the antenna bandwidth is not clearly understood. In this thesis, quality factors of vertically polarized antennas above a ground plane are computed and compared with their free-space counterparts. The theoretical results on quality factors are validated with simulations of electrically small spherical helix antennas.AntennasElectromagnetics and Photonicsthesis