A novel wideband, triple-resonant sectorial dipole antenna with simple configuration is advanced. The antenna is evolved from a 1.5-wavelength prototype electric dipole, which is backed by a circular metallic planar reflector. The flared angle of the sectorial radiator and the corresponding usable resonant modes for wideband radiation is determined by mode synthesis chart. As numerically and experimentally validated, the flared angles of the principal dipole should be 300°, with its radius approximately equal to 0.23-wavelength centered at 2.4 GHz. By introducing a pair of tuning stubs and a pair of slits along circumference, three resonant modes simultaneously excited in a single sectorial dipole to generate a wideband, triple-resonant radiation characteristic. Prototype antennas are then fabricated to experimentally validate the design approach. It is shown that the proposed antenna exhibits a unidirectional pattern with its impedance bandwidth over 73.3%. Meanwhile, stable radiation patterns with gain fluctuation less than 2.4 dB, low cross polarization level of −27 dB, and maximum gain of 6.9 dBi are realized within the same frequency range.

中文翻译：

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三谐振宽带 1.5 波长扇形偶极天线

提出了一种配置简单的新型宽带三谐振扇形偶极天线。天线是从 1.5 波长原型电偶极子演变而来的，它由圆形金属平面反射器支持。扇形辐射器的张角和相应的宽带辐射可用谐振模式由模式合成图确定。经数值和实验验证，主偶极子的张角应为 300°，其半径大约等于 0.23 波长，以 2.4 GHz 为中心。通过沿圆周引入一对调谐短截线和一对狭缝，在单个扇形偶极子中同时激发三种谐振模式，以产生宽带、三重谐振辐射特性。然后制造原型天线以通过实验验证设计方法。结果表明，所提出的天线表现出单向模式，其阻抗带宽超过 73.3%。同时，在相同频率范围内实现了增益波动小于2.4 dB的稳定辐射模式，-27 dB的低交叉极化水平和6.9 dBi的最大增益。