1041學年度：平衡式平面跨接耦合器設計
計畫名稱：平衡式平面跨接耦合器設計
執行起迄：2015/08/01~2016/10/31
總核定金額：595,000元
中文摘要：本研究分析雙通道平衡式跨接耦合器的混模散射參數，並據以提出文獻上第一個雙通道平衡式跨接耦合器，共有兩種架構。第一種架構的跨接耦合器由兩組環形微帶線組成，環形微帶線之間由四條傳輸線段做連結，具有雙對稱面。運用奇偶模分析，本研究提出設計公式並以理論分析加以驗證，亦作頻寬分析來提供設計的準則。為了驗證，實作並量測一個操作在2.45 GHz的平衡式跨接耦合器，其電路尺寸為0.95波長 × 0.95波長。此電路差模反射損失、隔離度、與植入損耗在2.45 GHz量測值分別是25.0、20.8、和0.86 dB。差模運作下，17 dB反射損失，20 dB隔離度，以及1 dB植入損失的量測頻寬分別是22.0%，4.1%，和5.6%。跨模散射參數在2.45 GHz均低於 –28 dB，–20 dB的頻寬為13%。此外，20-dB共模抑制頻寬均可達45.0%。量測值與全波分析吻合，均證實所設計的電路特性。為了改善第一種架構跨接耦合器的差模頻寬，本研究計畫提出第二種架構的電路。實作的第二種架構平衡式跨接耦合器在差模運作以及跨模抑制上均具有20%的頻寬，亦有29%的共模抑制頻寬。第二種架構電路尺寸也較小，約為第一種架構電路面積的80%。
英文摘要：The mixed-mode S parameters of a generic four-port balanced crossover have been analyzed. According to the S parameters, two types of four-port balanced crossovers have been presented for the first time. For type I, the crossover consists of two microstrip ring-shaped circuits connected by four transmission-line sections and exhibits bisymmetry. Employing even-odd mode analysis, design equations have been proposed and theoretically verified. Bandwidth analysis has also been conducted to provide a design guideline. For verification, a 2.45-GHz balanced crossover of type I which occupies an area of 0.95 × 0.95 2 has been implemented and measured. The measured differential-mode return loss, isolation, and insertion loss at 2.45 GHz are 25.0, 20.8, and 0.86 dB, respectively. The measured bandwidths in the differential mode are 22.0%, 4.1%, and 5.6% for the 17-dB return loss, 20-dB isolation, and 1-dB insertion loss, respectively. Cross-mode S parameters are less than –28 dB at 2.45 GHz with –20-dB bandwidths of 13%. In addition, bandwidths of 20-dB common-mode rejection are no less than 45.0%. The measured data agree with the full-wave simulated results and validate the proposed design. To improve the differential-mode bandwidth of type-I crossover, a crossover of type II has been proposed and designed. The fabricated type-II crossover exhibits a bandwidth of 20% for both differential-mode operation and cross-mode rejection. A bandwidth of 29% for common-mode rejection is also achieved. The circuit size of type-II crossover is also reduced, which is around 80% of the type-I crossover.
執行起迄：2015/08/01~2016/10/31
總核定金額：595,000元
中文摘要：本研究分析雙通道平衡式跨接耦合器的混模散射參數，並據以提出文獻上第一個雙通道平衡式跨接耦合器，共有兩種架構。第一種架構的跨接耦合器由兩組環形微帶線組成，環形微帶線之間由四條傳輸線段做連結，具有雙對稱面。運用奇偶模分析，本研究提出設計公式並以理論分析加以驗證，亦作頻寬分析來提供設計的準則。為了驗證，實作並量測一個操作在2.45 GHz的平衡式跨接耦合器，其電路尺寸為0.95波長 × 0.95波長。此電路差模反射損失、隔離度、與植入損耗在2.45 GHz量測值分別是25.0、20.8、和0.86 dB。差模運作下，17 dB反射損失，20 dB隔離度，以及1 dB植入損失的量測頻寬分別是22.0%，4.1%，和5.6%。跨模散射參數在2.45 GHz均低於 –28 dB，–20 dB的頻寬為13%。此外，20-dB共模抑制頻寬均可達45.0%。量測值與全波分析吻合，均證實所設計的電路特性。為了改善第一種架構跨接耦合器的差模頻寬，本研究計畫提出第二種架構的電路。實作的第二種架構平衡式跨接耦合器在差模運作以及跨模抑制上均具有20%的頻寬，亦有29%的共模抑制頻寬。第二種架構電路尺寸也較小，約為第一種架構電路面積的80%。
英文摘要：The mixed-mode S parameters of a generic four-port balanced crossover have been analyzed. According to the S parameters, two types of four-port balanced crossovers have been presented for the first time. For type I, the crossover consists of two microstrip ring-shaped circuits connected by four transmission-line sections and exhibits bisymmetry. Employing even-odd mode analysis, design equations have been proposed and theoretically verified. Bandwidth analysis has also been conducted to provide a design guideline. For verification, a 2.45-GHz balanced crossover of type I which occupies an area of 0.95 × 0.95 2 has been implemented and measured. The measured differential-mode return loss, isolation, and insertion loss at 2.45 GHz are 25.0, 20.8, and 0.86 dB, respectively. The measured bandwidths in the differential mode are 22.0%, 4.1%, and 5.6% for the 17-dB return loss, 20-dB isolation, and 1-dB insertion loss, respectively. Cross-mode S parameters are less than –28 dB at 2.45 GHz with –20-dB bandwidths of 13%. In addition, bandwidths of 20-dB common-mode rejection are no less than 45.0%. The measured data agree with the full-wave simulated results and validate the proposed design. To improve the differential-mode bandwidth of type-I crossover, a crossover of type II has been proposed and designed. The fabricated type-II crossover exhibits a bandwidth of 20% for both differential-mode operation and cross-mode rejection. A bandwidth of 29% for common-mode rejection is also achieved. The circuit size of type-II crossover is also reduced, which is around 80% of the type-I crossover.
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