Abstract
A planar ultra-wideband antenna with dual band-notched characteristics is proposed. The main features of the proposed antenna are the compact dimensions and band-notched characteristics that are achieved without modifying the radiator or the ground plane. The antenna consists of a square patch as radiator, a partial ground plane and a slotted conductor-backed plane. The dual band-notched characteristics are achieved by a U-shaped slot and a pair of mirror inverted L-shaped slots at the conductor-backed plane. By inserting a U-shaped slot with variable dimensions on the conductor-backed plane, additional resonances are excited and hence much wider impedance bandwidth can be obtained, especially at the higher band. The measured results show that the proposed antenna operates over the frequency band between 2.8 and 14.8 GHz (137 %), defined by S11 < − 10 dB, except two notched bands WiMAX (3.3–3.6 GHz) and WLAN (5.15–5.825 GHz). The designed antenna has a small size of \({18 \times 18}\) mm. The antenna has a desirable VSWR level, radiation pattern and gain characteristics for ultra-wideband frequency band range.
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