Zhang Wei, Shi Jin, Wu Gangxiong, Lin Longlong, Xu Kai
School of Information Science and Technology, Nantong University, Nantong 226019, China.
Research Center for Intelligent Information Technology, Nantong University, Nantong 226019, China.
Micromachines (Basel). 2023 Jan 22;14(2):285. doi: 10.3390/mi14020285.
In this paper, a slotted substrate integrated waveguide (SIW) is used to create a balanced phase shifter with wideband common-mode (CM) suppression. Differential-mode (DM) impedance matching and CM suppression are achieved by utilizing the fact that TE mode and TE (TE) mode can only transmit DM signals and CM signals, respectively, and by increasing the bandwidth for CM suppression via slots. Furthermore, a wideband phase shift with low phase deviation can be obtained due to the phase slop counteract between the slot and the delay line. Compared with the state-of-the-art, the proposed one has the advantages of wideband CM suppression, wide phase shift range, and a simple and easy-to-make structure. Five prototypes covering the frequency of 3.5 GHz are designed with the relative operating bandwidth for 45° ± 2° (90° ± 4.5°, 135° ± 6°, and 180° ± 8°) phase shifter of 20% (20%, 20%, and 20%), with the minimum insertion loss of 0.41 dB (0.5 dB, 0.58 dB, and 0.59 dB), with the minimum return loss greater than 15 dB, and with the relative bandwidth for 15-dB CM suppression of 59% (59%, 58%, and 57%).
本文中，采用缝隙基片集成波导（SIW）来创建具有宽带共模（CM）抑制功能的平衡移相器。通过利用TE模式和TE（TE）模式分别只能传输差模（DM）信号和共模信号这一事实，并通过增加缝隙的共模抑制带宽，实现了差模阻抗匹配和共模抑制。此外，由于缝隙和延迟线之间的相位斜率抵消，可获得具有低相位偏差的宽带相移。与现有技术相比，所提出的移相器具有宽带共模抑制、宽相移范围以及结构简单易于制作的优点。设计了五个覆盖3.5 GHz频率的原型，对于45°±2°（90°±4.5°、135°±6°和180°±8°）移相器，其相对工作带宽为20%（20%、20%和20%），最小插入损耗为0.41 dB（0.5 dB、0.58 dB和0.59 dB），最小回波损耗大于15 dB，15 dB共模抑制的相对带宽为59%（59%、58%和57%）。
