A COMPACT QUAD BAND-NOTCHED UWB MONOPOLE ANTENNA LOADED ONE LATERAL L-SHAPED SLOT

A novel compact microstrip-fed planar monopole antenna with quad-notched bands is presented. The proposed antenna is based on one rectangular-stepped-patch. To achieve the higher resonance over the 12GHz, one lateral L-shaped structure is embedded in the ground. By inserting four U-shaped slots in the radiation patch, quad band-notched properties in the WiMAX (3.3{3.6GHz), INSAT (4.5{4.8GHz), lower WLAN (5.15{5.35GHz) and higher WLAN (5.725{5.825GHz) are obtained. Experimental results indicate that the designed UWB antenna can obtain broadband matched impedance values, good frequency selectivity over the notched bands, relatively ∞at group delay and nearly omni-directional transmission characteristics across the UWB frequencies. More importantly, the quad-notched bands can be reconflgurable by shorting the corresponding U-shaped slots.

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