Potential advantage of using non rectangular ground in small antennas featuring wideband impedance match

Domination of PIFAs could have satisfied demands set by designers of portable terminals for almost a decade. However, any other form of high efficiency antenna featuring a high degree of miniaturization raises interest both in terms of electromagnetic phenomenon explored and in terms of potential practical uses. Furthermore, some subtle details - neglected during research works - may gain a status go or no go factor in mass market uses. Driven with this motivation we put much attention in our studies into antenna miniaturization with other means than barely the PIFA concept. To bandwidth properties in miniature antennas, a paramount importance has an interaction between the ground and the element. Focus on this interaction turned out to be key to invent coaxially fed miniature antennas without any short which is presented in this paper.