微波電路期中 / 期末報告

1. 微波電路期中/期末報告 論文研討: Y.S. Lin , C. H. Chen, “Novel Lumped-Element Uniplanar Transitions”, IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 49, NO. 12, DECEMBER 2001 報告人: 碩研光電一甲 MA0L0201 陳建翔 Southern Taiwan University Department of Electronic Engineering

2. Abstract • In this study, various compact lumped-element coplanar waveguide (CPW)-to-slotline and finite-ground coplanar waveguide (FGCPW)-to-coplanar stripline (CPS) transition structures are developed and carefully examined. Specifically, the performance of proposed basic lumped-element transitions can easily be adjusted through the control of and values, while the design of lumped element Marchand-balun-type transitions may be accomplished by the use of conventional filter synthesis techniques.

3. Coplanar waveguide (CPW)-to-slotline ‧CPW-to-slotline layout

4. Coplanar waveguide (CPW)-to-slotline This model is based on three assumptions: ‧First, the CPW and slotline sections are modeled as transmission lines despite the non-TEM nature of slotline. ‧Second, the detailed discontinuity effect of the CPW–slotline T-junction is neglected. ‧Third, the interactions between the lumped-element circuit and the transmission lines are not taken into account. ‧CPW-to-slotline equivalent-circuit model

5. Measured and simulated results ‧Measured:HP8510 network analyzer with thru-reflect-line (TRL) calibration ‧Simulated : based on the equivalent-circuit model

6. “Ring-type L” CPW-to-slotline transition

7. Measured and simulated results

8. Finite-ground coplanar waveguide (FGCPW)-to-coplanar stripline (CPS)

9. Measured and simulated results

10. Metal-insulator-metal (MIM) configuration

11. Measured and simulated results

12. Finite-ground coplanar waveguide (FGCPW)-to-coplanar stripline (CPS)

13. Measured and simulated results

14. Measured power losses

15. Marchand-balun-type ‧The conventional Marchand-balun-type structure and S21 (dB)

16. Marchand-balun-type

17. Measured and simulated results

18. Marchand-balun-type

19. Measured and simulated results

20. Conclusion • For the basic lumped-element uniplanar transitions, the center frequency and bandwidth can easily be determined and controlled by an adjustment of and values. • For design and modeling purpose, effective and simple equivalent-circuit models have also been established. The proposed lumped-element transitions have the merits of very compact size, low power losses, moderate bandwidth, and easy characterization, thus providing simple and effective interconnections between CPW and slotline/CPS.

21. 心得與感想 • 使用CPW、slotline、FGCPW 、CPS這些集總元件來實現傳統的 open short 電路，不只能縮小其面積也能藉由調整集總元件，來控制電路的等效LC ，藉此來達到我們所想要的頻率以及頻寬。而這樣的方法，對於現在設計小型薄型化的通訊設備有相當大的幫助。

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