本篇論文探討如何利用微帶線的技術，將兩個殘段(stub)附加於50Ω線之中，並且將底下接地平面(ground planar)刨出相對應的槽段(slot-line)，經過上下合併之後，能夠產生訊號全通(all-pass)的現象。相較於過往的全通帶群延遲線(group delay line)，本篇技術的優點在於能縮小基板的表面積，及在中心頻率(central frequency)產生全通的效果。
原則上，一條50Ω傳輸線並聯一條或兩條殘段，有帶拒(band-stop)濾波的功能，同時，它的中心頻率取決於殘段的長度，頻寬取決於殘段的寬度。此外，理論上存在著相對應的槽段在接地平面裡，能產生相同效果的帶拒功能，也就是指相同的中心頻率。本篇論文將兩個對應的殘段與槽段上下疊在一起，電容與電感效應能夠有互補(complementary)效果，所有頻率的訊號能全通到輸出端。 本篇論文的另一項突破是，殘段與槽段的相對位置。傳統的重疊方法，是將殘段與槽段完全對齊在一起，本篇研究是尋找新的疊法，能夠在不完全對齊的條件下，也能有相同的全通現象。另一個探討的是，本篇研究能比傳統的有較長的群延遲時間。

A new method to implement an all-pass phenomena by microstrip technology where two shunted stubs are attached to the 50Ω line and a slot-line is produced on the ground planar. The advantage of the new method is lowering the substrate area and obtaining the same all-pass result as possible.
Originally, a transmission line with one or two shunted stubs implement a band-stop phenomena as a frequency filter；meanwhile, the central frequency is dependent on the stub physical length, and the bandwidth changes with the stub width which determines the impedance. Then, theoretically there exists a corresponding slot-line carve on the ground planar, which performs as the same filter independently. The open stubs and slot-line should have the same central frequency. After combining the open stubs and the slot-line planar, an all-pass phenomena occurs.
Another breakthrough is the reference position between open stubs and slot-line. Generally, the open stubs had better locate right above the slot-line in order to get all-pass phenomena. This research is to find out whether it is possible to shift the reference position of both and obtain all-pass result.

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