A compact phase shifter using substrate integrated waveguide (SIW) with two slots is proposed in this letter. The wideband phase shift is mainly caused by the opposite phase shift slopes produced by the slots and the microstrip delay lines over a wide frequency range. Furthermore, the wide phase shift range (−90° to 90°) can be achieved and be with the same reference line. Compared with the state of the arts, the proposed one gives consideration of the wide bandwidth, wide phase shift range, simple and compact size, and easy-to-make structure, while the SIW counterparts just consider part of the above features. Five prototypes covering the frequency of 26 GHz are designed with the operating bandwidth for 90° ± 5° (−45° ± 2.5°, 45° ± 2.5°, and 90° ± 5°) phase shifter of 26.6% (29.2%, 35.8%, and 39.3%) and the size of $2.29\lambda _{g}^{2}$ ( $2.42\lambda _{g}^{2}$ , $2.71\lambda _{g}^{2}$ , and $2.86\lambda _{g}^{2}$ ; $\lambda _{g}$ is the guided wavelength at the center frequency $f_{0}$ ).

中文翻译：

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使用开槽基板集成波导的紧凑型宽带移相器

在这封信中提出了一种使用带有两个槽的衬底集成波导 (SIW) 的紧凑型移相器。宽带相移主要是由缝隙和微带延迟线在很宽的频率范围内产生的相反的相移斜率引起的。此外，可以实现宽相移范围（-90° 至 90°）并且使用相同的参考线。与现有技术相比，所提出的一种考虑了宽带宽、宽相移范围、简单紧凑的尺寸和易于制造的结构，而SIW对应物只考虑了上述特征的一部分。覆盖 26 GHz 频率的五个原型设计为 90° ± 5°（-45° ± 2.5°、45° ± 2.5° 和 90° ± 5°）移相器的工作带宽为 26.6%（29.2%， 35.8% 和 39.3%) 以及 $2.29\lambda _{g}^{2}$ ( $2.42\lambda _{g}^{2}$ , $2.71\lambda _{g}^{2}$ ， 和 $2.86\lambda _{g}^{2}$ ; $\lambda _{g}$ 是中心频率处的引导波长 $f_{0}$ ）。