A simplified notched design method for the Vivaldi antenna is exhibiting high frequency-band-selectivity characteristics. By suitably introducing half-wavelength resonator (HWR) and complementary capacitively loaded loop (CCLL), the notched-band selectivity is promoted while maintaining the wide impedance bandwidth of the antenna applicable for wireless communications. HWR is bent in the middle to focus the first notch pole, and the second notch pole is obtained by CCLL on the radiating patch. Additionally, the resonant frequency of the notched pole can be determined by the position and size of two loaded resonators in theoretical analysis, thereby realizing a wideband antenna with the desired notched band. Finally, the Vivaldi antenna of loading resonator was fabricated to verify the feasibility of this new method. Measured and simulated experimental results reveal that the antenna exhibits directional pattern in the passband, low gain at the band-rejection, and excellent selectivity within a frequency range. The simulation and measurement results are in good agreement. The proposed antenna achieves S11<−10 dB in 2.6–13.7 GHz and a notch band from 4.49 to 6.64 GHz to reject IEEE 802.11a and HIPERLAN/2 frequency band. Moreover, the proposed antenna has good frequency selectivity, and its gain is good enough in the passband with peak gain up to 10.8 dBi. This antenna design presents frequency suitability, demonstrating that a UWB antenna with a controllable notched band has been realized.

中文翻译：

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使用混合HRW / CCLL的高选择性带阻维瓦尔第天线

维瓦尔第天线的一种简化的缺口设计方法具有高频带选择性特性。通过适当地引入半波长谐振器（HWR）和互补电容性负载环路（CCLL），可以在保持适用于无线通信的天线的宽阻抗带宽的同时，提高陷波带选择性。HWR在中间弯曲以将第一个陷波极聚焦，而第二个陷波极则通过CCLL在散热片上获得。另外，在理论分析中，可以通过两个负载谐振器的位置和大小来确定缺口极的谐振频率，从而实现具有所需缺口频带的宽带天线。最后，制造了负载谐振器的维瓦尔第天线，以验证该新方法的可行性。测量和模拟的实验结果表明，天线在通带中表现出方向性，在带阻时增益低，并且在频率范围内具有出色的选择性。仿真和测量结果吻合良好。拟议中的天线在2.6–13.7 GHz内达到S11 <−10 dB，并在4.49至6.64 GHz的陷波频带内拒绝IEEE 802.11a和HIPERLAN / 2频带。而且，所提出的天线具有良好的频率选择性，并且其增益在通带中足够好，峰值增益高达10.8 dBi。这种天线设计具有频率适应性，表明已经实现了具有可控陷波频带的UWB天线。仿真和测量结果吻合良好。拟议中的天线在2.6–13.7 GHz内达到S11 <−10 dB，并在4.49至6.64 GHz的陷波频带内拒绝IEEE 802.11a和HIPERLAN / 2频带。而且，所提出的天线具有良好的频率选择性，并且其增益在通带中足够好，峰值增益高达10.8 dBi。这种天线设计具有频率适应性，表明已经实现了具有可控陷波频带的UWB天线。仿真和测量结果吻合良好。拟议中的天线在2.6–13.7 GHz内达到S11 <−10 dB，并在4.49至6.64 GHz的陷波频带内拒绝IEEE 802.11a和HIPERLAN / 2频带。而且，所提出的天线具有良好的频率选择性，并且其增益在通带中足够好，峰值增益高达10.8 dBi。这种天线设计具有频率适应性，表明已经实现了具有可控陷波频带的UWB天线。