A novel U‐shaped bow‐tie magneto‐electric dipole unidirectional antenna with a dual‐layer horned reflector for ultra‐wideband (UWB) applications is proposed. To broaden impedance bandwidth, a U‐shaped bow‐tie electric dipole structure with two notch slots is presented. In addition, to reduce the size of the antenna and improve impedance matching, a new feeding structure designed with perforation and tapered line is introduced. Finally, a double‐layer horned reflector, instead of a ground plane, is employed to improve radiation patterns and gains for high‐rate data transmission. The prototype antenna can achieve a stable gain of 10 ± 1.2 dBi and an impedance bandwidth of 118% for standing wave ratio ≤ 2 from 2.81 to 10.92 GHz. To the best of the authors knowledge, it is the first U‐shaped bow‐tie magneto‐electric dipole unidirectional antenna for UWB applications. The proposed antenna, which possesses the advantages of UWB antenna and magneto‐electric dipole antenna simultaneously, can be easily fabricated with low cost. With these features, it is a practicable candidate for UWB communications.
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Feng et al. (2014) studied this question.
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