Abstract
A compact wideband planar monopole antenna with unidirectional radiation properties is proposed in this letter. The measured results demonstrate that the antenna has an S 11 F / B ) > 10 dB across the operating frequency range. The antenna is very simple, comprising a slotted-stepped radiating patch attached to the ground plane through a shorting side stub. The antenna has a small size of 20 × 20 mm2, good F / B , and does not require cavity-backed structures and ground plane extensions, making it attractive for compact wireless devices. The antenna also possesses stable main lobe directions.
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