Tyndall National Institute, University College Cork, Cork, T12R5CP, Ireland.
School of Electrical Engineering, Shiraz University, Shiraz, Iran.
Sci Rep. 2023 Mar 14;13(1):4246. doi: 10.1038/s41598-023-31019-7.
Conventional Wilkinson power dividers (WPDs) can provide acceptable performance close to the nominal center frequency. However, these WPDs can also exhibit poor out-of-band performance while requiring a large footprint. In order to improve on the current state of the art, a modified microstrip WPD is proposed that exhibits a substantially improved stopband and high isolation. A lowpass filter (LPF) structure is utilized in both branches of the power divider to provide harmonic suppression. According to the obtained results, the input return loss (|S|), output return loss (|S|), output insertion loss (|S|) and isolation (|S|) are better than 34.2 dB, 26.2 dB, 3.52 dB and 31.2 dB, respectively. The proposed modified WPD has a wide 20 dB stopband (from 2.54 GHz to 13.48 GHz) and filters the second to seventh harmonics with attenuation levels of greater than 20 dB. The proposed WPD has a small size of 33.8 mm × 27 mm (0.42 λg × 0.33 λg), where λg is the guided wavelength at the operating frequency of 1.8 GHz. The WPD has been fabricated and tested and shows good agreement between simulated and measured results and the proposed design has desirable characteristics for LTE and GSM applications.
传统的威尔金森功率分配器 (WPD) 在接近标称中心频率时可以提供可接受的性能。然而，这些 WPD 在带宽外的性能也很差，同时需要较大的占地面积。为了改进当前的技术水平，提出了一种改进的微带 WPD，它具有显著改善的带阻和高隔离度。在功率分配器的两个分支中都使用了低通滤波器 (LPF) 结构来提供谐波抑制。根据获得的结果，输入回波损耗 (|S|)、输出回波损耗 (|S|)、输出插入损耗 (|S|) 和隔离度 (|S|) 分别优于 34.2 dB、26.2 dB、3.52 dB 和 31.2 dB。所提出的改进型 WPD 具有 20 dB 宽的阻带（从 2.54 GHz 到 13.48 GHz），并过滤第二到第七次谐波，衰减水平大于 20 dB。所提出的 WPD 尺寸较小，为 33.8 mm×27 mm（0.42 λg×0.33 λg），其中 λg 是在 1.8 GHz 工作频率下的导波波长。已经制造和测试了 WPD，并且在模拟和测量结果之间显示出良好的一致性，并且该设计具有适用于 LTE 和 GSM 应用的理想特性。
