Abstract
A new compact ultra-wideband (UWB) antenna with triband-notched characteristics is presented. The structure of the proposed antenna is simple and symmetric. A modified ground is introduced to obtain a wide impedance bandwidth of 2.9–13.4 GHz withS11<-10 dB. By inserting two arc-shaped slots in the radiation patch, two sharp bands of 3.3–3.7 GHz and 5.15–5.35 GHz are notched. The notch band of 7.25–7.75 GHz is achieved by etching a U-shaped slot in the ground plane. The notched bands can be controlled, respectively, while the characteristics of the proposed UWB antenna almost keep completely unchanged at the unnotched frequencies. Equivalent circuit models, surface current distributions, and input impedance are applied to analyze the principle of the proposed UWB antenna. Parametric studies are given. Simulated and measured results show that the proposed antenna has good impedance matching, stable radiation patterns, and constant gain.
Highlights
The Federal Communication Commission (FCC) has prescribed 3.1 to 10.6 GHz for commercial ultra-wideband (UWB) communication systems [1]
A U-shaped slot is cut in the ground plane to generate the third notched band in 7.25–7.75 GHz for the downlink of X-band satellite communication systems
We present equivalent circuit models, surface current distributions, and input impedance to discuss the proposed UWB antenna
Summary
The Federal Communication Commission (FCC) has prescribed 3.1 to 10.6 GHz for commercial ultra-wideband (UWB) communication systems [1]. It is desirable to design UWB antennas with bands notched characteristics. A modified ground with two fillets and three steps is introduced to produce smooth transition from one resonant mode to another as this structure changes the inductance and capacitance of the input impedance. These measures are useful to decrease the discontinuities and the reflections. A U-shaped slot is cut in the ground plane to generate the third notched band in 7.25–7.75 GHz for the downlink of X-band satellite communication systems.
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