本論文主要探討是否能透過共模穿透(Scc21)的諧振點與共模雜訊吸收頻率點設計於同一點，進而提升吸收型共模抑制濾波器的吸收率。為達到上述目的，我們需要設計反射型共模抑制濾波器的傳輸零點，並透過相位匹配技術及吸收端來調整吸收頻率點，藉由這兩項來完成高吸收率效果。
使用反射型共模抑制濾波器架構為三層架構，是在蜿蜒差動傳輸線下方置入一E字型諧振器，透過諧振器與蜿蜒差動線之間的相互作用達到雙模態激發，並是當設計傳輸零點的位置移至所要吸收頻率，並同時達到寬頻抑制的特性。在頻域上，此濾波器於2GHz至10.3GHz共模皆抑制於-10dB以下，比例頻寬有135%。該濾波器整體尺寸為0.4λc×0.2λc，λc為其抑制頻帶中心頻率6GHz之波長，且於抑制頻率範圍內差模訊號階保持著良好的完整性。
接著使用雙頻步階阻抗相位匹配與串聯式吸收端將完成的反射型共模抑制濾波器延伸為吸收型共模抑制濾波器，並根據通訊協定針對2.4GHz~2.5GHz與5.17GHz~5.33GHz雙頻段進行共模雜訊吸收。從頻域上，此濾波器的差模穿透從DC到12GHz階小於-3dB。共模抑制範圍從2GHz到10.9GHz皆抑制在-10dB以下，在2.4GHz~2.5GHz與5.17GHz~5.33GHz 的吸收效率分別為分別在97%與96%以上。
綜合上述，此篇論文驗證確實可以利用抑制與吸收頻率點的重疊來提升共模雜訊的吸收率，同時也有著體積小、架構簡易與寬頻抑制等優點，對於實務有其應用價值。

This paper mainly discusses whether the resonance point of common mode penetration (Scc21) can be designed at the same point as the common mode noise absorption frequency point, thereby improving the absorption rate of the absorption type common mode rejection filter. In order to achieve the above purpose, we need to design the transmission zero point of the reflection type common mode filter and adjust the absorption frequency point by the phase matching technology and the absorption port. It can complete the effect of high absorption rate by these two part.
The reflective common-mode rejection filter architecture is a three-layer architecture. An E-shaped resonator is placed under the meandering differential transmission line, and dual-mode excitation in common mode is achieved through the interaction between the resonator and the meandering differential line. When the position of the design transmission zero is moved to the desired absorption frequency, and at the same time achieve the characteristics of broadband suppression. In the frequency domain, the common mode of this filter is suppressed below -10dB from 2 GHz to 10.3 GHz, and the proportional bandwidth is 135%. The overall size of the filter is 0.4λ_c×0.2λ_c, and λ_c is the wavelength of the center frequency of the suppression band of 6 GHz, and the differential mode signal stage maintains good integrity within the suppression frequency range.
Then, the dual-frequency step impedance phase matching and series absorption end are used to extend the completed reflection-type common-mode suppression filter into an absorption-type common-mode suppression filter, and according to the communication protocol for 2.4GHz~2.5GHz and 5.17GHz~5.33GHz Dual-band common-mode noise absorption. From the frequency domain, the differential mode penetration of this filter is less than -3dB from DC to 12GHz. The common-mode suppression range is from 2GHz to 10.9GHz, and the suppression is below -15dB, and the absorption efficiency at 2.4GHz~2.5GHz and 5.17GHz~5.33GHz is above 97% and 96%, respectively.
Based on the above, this paper verifies that the overlap of the suppression and absorption frequency points can indeed be used to improve the absorption rate of common mode noise. It also has the advantages of small size, simple architecture and broadband suppression, which have practical application value.

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