BROADBAND LOW-PROFILE CYLINDRICAL MONOPOLE ANTENNA FOR 1800 MHz OPERATION

摘要

A broadband low-profile cylindrical monopole antenna, top-loaded with a shorted circular patch, is presented. For 1800-MHz operation, the antenna shows a low profile of only 11 mm, corresponding to about 6.6% of the wavelength at 1800 MHz. In addition, the antenna has a wide bandwidth (larger than 20%) covering the DCS (1710-1880 MHz) and PCS (1850-1990 MHz) bands and shows very good omnidirectional radiation.