Mu-negative (MNG) transmission linesare artificial structureswhereseries-loaded capacitors are used to effectively obtain negative permeability. Because they have apropagation constant of zero, MNG transmission linescan be used to design resonators with an infinite wavelength and a resonance frequency independent of size to realize compact antenna designs with wide bandwidths. In this study, a wide-bandwidth dipole antenna and a loop antenna with a segmented line structure based on an MNG transmission line are proposed and fabricated. The proposed dipole antenna can operate ata wide impedance bandwidth of 1.4 GHz (2.2-3.6 GHz, 48%) with a length of 107 mm (1.03λ₀@2.9 GHz) and exhibits stable E-plane radiation patterns. The proposed loop antenna can operate ata wide bandwidth of 1GHz (2.4-3.4 GHz, 34%) with a diameter of 52 mm (0.5λ₀@2.9 GHz). Moreover, the proposed loop antenna has a uniform current distribution;thus, radiation characteristics equivalent to those of a magnetic dipole can be obtained. The experimentaland simulation results demonstrate good agreement.