This paper presents a novel square-cylindrical monopole antenna fabricated using a single metal plate. A prototype of the proposed antenna with a cross-sectional area of 10 x 10 mm(2) and a length of 30 nm is implemented, and the measured results indicate that the antenna can provide good omnidirectional radiation over a wide frequency, hand covering 2 to 11 GHz, thus making it very promising for IEEE 802.16a operation. (c) 2005 Wiley Periodicals, Inc.