A new multiband coplanar waveguide fed zeroth-order resonant (ZOR) antenna structure with improved bandwidth is proposed. This antenna achieves multiband functionality in five different frequency bands in the range of 2.5–5 GHz. The ZOR frequency is observed to be at 3.97 GHz. The bandwidth improvement, gain, and antenna efficiency at this frequency is found to be 3.28%, 1.9769 dB, and 73.42%, respectively. The proposed antenna is measured at antenna measurement facility, and results were compared with the simulated results. A good agreement between the measured and the simulated results validates the proposed design. The designed antenna proposed in this article holds potential applications in modern wireless communication systems which require multiband antennas with good radiation characteristics. © 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE 22:569–574, 2012.