A compact broadband phase shifter based on the half-mode substrate-integrated waveguide (HMSIW) is proposed in this letter. By etching interdigital capacitor or adding blind holes and patches into the HMSIW, the width of the HMSIW can be reduced. Moreover, based on the complementary phase responses of series capacitance and shunt capacitance loading on the HMSIW, a broadband phase shifter is designed with a small phase deviation. To validate the proposed design approach, two phase shift channels and the reference channel are fabricated and measured. Phase shifts of 86° ± 2.5° (and 43.5° ± 2.5°) with fractional bandwidths of 53.3% (and 35.7%) covering central frequencies of 7.5 GHz (and 8.4 GHz) are achieved. The insertion losses of the three channels are 0.76-1.32, 0.40-0.63, and 0.87-1.40 dB, respectively. Besides, the area of each branch is only 0.343λg2; λg is the guided wavelength at the center frequency in the dielectric.

中文翻译：

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基于HMSIW渐逝模式的紧凑型宽带移相器


这封信提出了一种基于半模基板集成波导（HMSIW）的紧凑宽带移相器。通过蚀刻叉指电容器或在HMSIW中添加盲孔和贴片，可以减小HMSIW的宽度。此外，基于HMSIW上串联电容和并联电容负载的互补相位响应，设计了具有小相位偏差的宽带移相器。为了验证所提出的设计方法，制造并测量了两个相移通道和参考通道。实现了 86° ± 2.5°（和 43.5° ± 2.5°）的相移，覆盖 7.5 GHz（和 8.4 GHz）中心频率的分数带宽为 53.3%（和 35.7%）。三个通道的插入损耗分别为0.76-1.32、0.40-0.63和0.87-1.40 dB。此外，每个分支的面积仅为0.343λg2； λg 是电介质中中心频率处的波导波长。