In this letter, a novel dual planar electromagnetic bandgap (DP-EBG) microstrip low-pass filter structure is investigated. The presented structure is realized by superposing two different one-dimensional (1-D) electromagnetic bandgap (EBG) structures which have different center frequency of the stopband into a coupled dual-plane configuration. Both simulation and experimental results have verified that only two cells of the proposed structure are enough for the measured −20 dB stopband from 3.7 GHz to 14 GHz with a excellent low-pass performance in a small circuit area. Since this novel design demonstrates superior low-pass filtering functionality, we expect this novel structure is widely used for wideband monolithic circuit applications.