Abstract:The design of compact and multiband antenna is increasingly important as multimode and multiband small communication equipment develops. A novel ultrawideband, cupshaped monopole antenna with three holes is presented with the virtues of the ring microstrip and monopole antennae. Experimental results show that the antenna bandwidth is greatly improved when compared to a traditional monopole antenn , The antenna offers an ultrabroadband performance in the frequency band 925.0 GHz, covering the L to K bands, and possesses a VSWR under 0∶1. With this very wide bandwidth, the antenna is attractive in multiband wireless communication.