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为了有效抑制超宽带(UWB)通信系统和窄带通信系统之间潜在的干扰,设计了一款具有三阻带特性和高频截止特性的超宽带天线。天线总尺寸为33 mm×19 mm×1 mm。该天线的辐射单元由一个椭圆形的单极子和一个倒梯形结构组成,由50的矩形微带线馈电,接地板由一个矩形和一个开槽梯形结构构成。对天线进行加工并测试。结果表明,该天线在3.3~3.6 GHz处的阻带由辐射单元上的凹形槽产生,5.15~5.35 GHz和5.725~5.825 GHz处的阻带由微带馈线两旁的U形寄生单元产生,10.8 GHz高频处的截止特性是由微带线两旁对称的凹形寄生单元共同决定的。天线的测试结果与仿真结果吻合良好。
In order to effectively suppress the potential interference between the UWB communication system and the narrowband communication system, an ultra-wideband antenna with three stopband characteristics and high-frequency cutoff characteristics is designed. The total antenna size is 33 mm × 19 mm × 1 mm. The antenna’s radiating element consists of an elliptical monopole and an inverted trapezoidal structure, fed by a rectangular strip of 50 microstrip lines. The ground plane consists of a rectangular and a slotted trapezoidal structure. Antenna processing and testing. The results show that the stopband of the antenna at 3.3-3.6 GHz is generated by the concave slot on the radiating element. The stopbands at 5.15-5.35 GHz and 5.725-5.825 GHz are generated by U-shaped parasitic elements on both sides of the microstrip feed line. The cut-off feature at GHz high frequencies is determined by the symmetrical concave parasitic elements on both sides of the microstrip line. The antenna test results are in good agreement with the simulation results.