Abstract
A compact printed UWB antenna with triple band-notched characteristics is proposed. Instead of conventional uniform width slots, two pairs of quarter-wavelength length nonuniform width slots are embedded into the radiating patch and the ground plane to achieve triple notched bands at 3.5, 5.5, and 8.1 GHz. A parameter study is performed to examine the effect of widths and lengths of the slots on the band-notched characteristics. It indicates that the centre frequencies and the bandwidth of notched bands can be controlled by tuning the physical parameters of the slots. Frequency domain measurements including return loss, antenna transfer function, group delay, and gain of the proposed antenna have been carried out. Corresponding results demonstrate that compact UWB antennas with multiple notched bands can be obtained by using nonuniform width slots.
Highlights
Since the spectrum of 3.1–10.6 GHz was released by the Federal Communication Commission (FCC) for commercial applications, ultrawideband (UWB) systems have attracted more and more attention, due to their merits of high data rate, low power consumption, and good immunity to multipath interference
A pair of quarterwavelength nonuniform width inverted L-shaped slots are symmetrically embedded on the radiating patch to create the dual notched bands with centre frequencies of 3.5 and 8.1 GHz, while another pair of quarter-wavelength nonuniform width straight slots corresponding to the notched band centred at 5.5 GHz are etched into the ground plane
Using two pairs of novel nonuniform width slots inserted into the radiating patch and the ground plane instead of conventional uniform width slots
Summary
Since the spectrum of 3.1–10.6 GHz was released by the Federal Communication Commission (FCC) for commercial applications, ultrawideband (UWB) systems have attracted more and more attention, due to their merits of high data rate, low power consumption, and good immunity to multipath interference. UWB system design faces many challenges, the serious one of which is interference with other coexisting narrow band communication systems such as WLAN, WiMAX, and ITU X-band satellite communication systems operating in 3.3–3.7 GHz, 5.15–5.825 GHz, and 8.025– 8.4 GHz, respectively This problem can be overcome by using an antenna with inherent band-notched characteristic rather than adopting an extra filter which may increase the complication, area, and cost of a UWB system. A popular method to realize A band-notched function is to embed a uniform width slot into the radiation element [4,5,6] or the ground plane [7,8,9] of the UWB antennas These antennas only have one or two notched bands; potential interference from other narrow bands can not be filtered out. The proposed method of using nonuniform width slot can be readily realized and retains the compact size of a UWB antenna
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