A simple and efficient approach for antenna miniaturization is proposed in this paper. A slow wave structure, which applies to the concept of increasing the propagation constant in the resonant path and so results in the decreased resonant frequencies, is used for implementation. In this paper, we present a CPW-fed slot-loop antenna periodically loaded with capacitors to effectively increase the propagation constant for the purpose of antenna miniaturization. The equivalent transmission line circuit model for the established antenna was utilized as an approach for analysis and it predicted the slow-wave behavior well when compared to the full-wave simulation. Both simulation and measurement demonstrate a physical size reduction of about six times with respect to an unloaded slot-loop antenna.