Abstract
A compact ultra-wideband microstrip-fed planar monopole antenna with dual band-notch characteristic is presented. Dual notched frequency bands are achieved by embedding an M-slot in the radiating patch and a W-slot in the ground beneath the feeding line. And the characteristics of the dual band-notched can be controlled by adjusting the length and position of the corresponding slot. Experimental results show that the proposed antenna, with compact size of 35 × 35 mm2, has an impedance bandwidth of 2.75 ∼ 11.30GHz for VSWR less than 2.0, except two notched bands of 3.25 ∼ 4.20 GHz and 5.23 ∼ 6.10GHz. Moreover, this antenna exhibits good omnidirectional radiation patterns in the H-plane, stable antenna gains over the operation band, and perfect group delay in the time-domain.
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