Abstract
A modified compact planar ultrawideband (UWB) monopole antenna with triple controllable band-notched characteristics is presented in this paper. The proposed antenna consists of a modified stair cased V-shaped radiating element and partial ground plane. The triple band-notched characteristics are achieved by embedding two different vertical up C-shaped slots with a vertical down C-shaped slot in the radiating patch and in the ground plane, respectively. Besides, the bandwidth of each rejected band can be independently controlled by adjusting the dimensions of the corresponding band notched structure. The proposed antenna with rejected bands characteristics is successfully simulated, prototyped, and measured. The measured results show that the antenna operates until upper 11 GHz for voltage standing wave ratio (VSWR) is less than 2, and exhibits bands rejection of 1.6–2.66 GHz (49.76%), 3-4 GHz (28.57%), and 5.13–6.03 GHz (16.12%). Moreover, the proposed antenna shows a near omnidirectional radiation patterns, stable peak gain, and with small group delay and transfer function variation on the whole UWB frequency range except in the notched frequency bands, which makes it suitable for being used in the future UWB applications.
Highlights
Ultrawideband (UWB) is specified in the Federal Communication Commission (FCC) [1] as the frequency band that ranges from 3.1 GHz to 10.6 GHz, which is a 7.5 GHz bandwidth (BW)
Many systems operate across several frequency bands, requiring a band-notched or band-rejected function
To overcome problems caused by this electromagnetic interference, several designs of UWB antennas with single or multiple notch functions have been proposed in recent literature [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39]
Summary
Ultrawideband (UWB) is specified in the Federal Communication Commission (FCC) [1] as the frequency band that ranges from 3.1 GHz to 10.6 GHz, which is a 7.5 GHz bandwidth (BW). The most popular approach is cutting different shaped slots from the radiating patch, from the ground plane, or from the feed line, that is, U-shaped slot [7], a Hilbert-curve shaped slot [8], cutting a wide line [9], T-shaped slot [10], defected ground structure (DGS) [11], semicircular slot [12], a bent slot or C-shaped slot [13,14,15], split ring in the ground plane [16], and slot line in the feed line [17]) Another way consists of loading diverse parasitic elements on the antenna, such as parasitic elements rear or near the radiating element [18,19,20,21,22,23], and near the feed line [24,25,26,27,28,29,30,31,32,33], to generate the band-notched
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