Abstract
We present a flexible ultrawideband (UWB) planar monopole antenna with dual-notched band characteristic printed on a polyimide substrate. The antenna is fed by a step coplanar waveguide (CPW) that provides smooth transitional impedance for improved matching. It operates from 2.76 to 10.6 GHz with return loss greater than 10 dB except for the notch band to reduce the interference with existing 3.5 GHz WiMAX band and 5.5 GHz WLAN band. With a combination of rectangular and circle patches in which the U-shaped slot is carved, the overall size of antenna is 30 mm × 20 mm. Moreover, a pair of arc-shaped stubs located at both sides of the feed line is utilized to create the notch band for WiMAX band. The results also show that the antenna has omnidirectional radiation pattern and smooth gain over the entire operational band.
Highlights
With the rapid advance in wireless communication techniques, UWB system has become one of the most fascinating technologies for indoor communications
We present a flexible UWB antenna with dual-notched band 3.5 GHz WiMax and 5.5 GHz WLAN
The U-shaped slot structure located in the radiation patch produces a notched band for 5.5 GHz WLAN band, and the resonant frequency is defined by the length of the slot
Summary
With the rapid advance in wireless communication techniques, UWB system has become one of the most fascinating technologies for indoor communications. Yoon et al presented a flexible UWB antenna which is fabricated on PET film and analyzed the characteristics of the flexible antenna when it is mounted on various kinds of conformal materials with the various dielectric constants [4] It used a rectangle as a radiation patch to reduce the deterioration of the bow because the current will not be changed largely in bending. Flexible and UWB characteristic has been achieved, proposed antennas cannot carry a notched band performance except by using a filter [6]. It used a pair of slots that are placed symmetrically on both sides of the patch to create the band notch characteristic that covers 4 GHz to 5.5 GHz. By the measured result we can see the proposed antenna does not have a good performance on high-frequency part. Element is studied first, and parameters of the antenna element are discussed; in Section 3, simulated and measured results are presented; a comparison between stepped ground and rectangular ground structure is given
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