A Differential-Fed UWB Antenna Element With Unidirectional Radiation

作者：Li, Mingjian^*; Luk, Kwai-Man

来源：IEEE Transactions on Antennas and Propagation, 2016, 64(8): 3651-3656.

DOI：10.1109/TAP.2016.2565726

• Differential-fed antenna
• magnetoelectric (ME) dipole
• ultrawideband (UWB) antenna
• unidirectional patterns

A new differential-fed broadband antenna element with unidirectional radiation is proposed. This antenna is composed of a folded bowtie, a center-fed loop, and a box-shaped reflector. A pair of differential feeds is developed to excite the antenna and provide an ultrawideband (UWB) impedance matching. The box-shaped reflector is used for the reduction of the gain fluctuation across the operating frequency band. An antenna prototype for UWB applications is fabricated and measured, exhibiting an impedance bandwidth of 132% with standing wave ratio <= 2 from 2.48 to 12.12 GHz, over which the gain varies between 7.2 and 14.1 dBi at boresight. The proposed antenna radiates unidirectionally with low cross polarization and low back radiation. Furthermore, the time-domain characteristic of the proposed antenna is evaluated. In addition, a 2x2 element array using the proposed element is also investigated in this communication.

• 出版日期2016-8
• 单位香港城市大学