Compact printed ultra-wideband monopole antenna with dual band-notch characteristic

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Abstract
A compact ultra-wideband microstrip-fed planar antenna with dual band-notch characteristic is presented. Two notched frequency bands are achieved by embedding an E-slot in the radiation patch and a U-slot defected ground structure in the feeding line. Moreover, the two notched bands can be controlled by adjusting the length of the corresponding slot. Experimental results show that the proposed antenna, with compact size of 35×14 mm, has an impedance bandwidth of 2.87–10.91 GHz for a voltage standing-wave ratio less than 2, except two frequency notched bands of 3.49–4.12 and 5.66–6.43 GHz.