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微波電路期中 / 期末報告
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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 UniversitySouthern Taiwan University Department of Electronic Engineering
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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.
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Coplanar waveguide (CPW)-to-slotline
Substrate(FR4)
εr 4.3
tanδ 0.022
h 1.6mm
CPW
Strip width 0.75mm
Slot width 1mm
Slotline
Slot width 1mm
Finger capacitor
Finger width 0.5mm
Finger length 3.4mm
Gap width 0.2mm
LC Total area
(λ/28) (λ/12)‧
‧CPW-to-slotline layout
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Coplanar waveguide (CPW)-to-slotline
‧CPW-to-slotline equivalent-circuit model
This model is based on three assumptions: First, ‧the CPW and slotline sections are modeled as transmission lines despitethe 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.
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Measured and simulated results
‧Measured:HP8510 networkanalyzer with thru-reflect-line (TRL) calibration‧Simulated : based on theequivalent-circuit model
Measured
1.5-dB passband 1.96~3.3GHz
Simulated
Inductance 5.5nH
Capacitance 0.6525pF
Center frequency 2.66GHz
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“Ring-type L” CPW-to-slotline transition
Finger capacitor
Finger width 0.5mm
Finger length 3.2mm
Gap width 0.2mm
Ring-type L
Rr 2.5mm
gapr 0.5mm
Total area
(λ/30) (λ/30)‧
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Measured and simulated results
Measured
1.5-dB passband 1.53~2.76GHz
Simulated
Inductance 5.89nH
Capacitance 0.6525pF
Center frequency 2.57GHz
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Finite-ground coplanar waveguide (FGCPW)-to-coplanar stripline (CPS)
FGCPW
Strip width 0.45mm
Slot width 0.6mm
Finite ground-plane 4mm
CPS
Strip width 4mm
Slot width 0.6mm
Finger capacitor
Finger width 0.5mm
Finger length 3.7mm
Gap width 0.3mm
Shorter metal strip
Strip width 0.5mm
Strip length 12.05mm
Total area
(λ/28) (λ/14)‧
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Measured and simulated results
Measured
1.5-dB passband 1.17~3.41GHz
Simulated
Inductance 10.35nH
Capacitance 0.597pF
Center frequency 2.02GHz
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Metal-insulator-metal (MIM) configuration
Shorter metal strip
Strip width 0.5mm
Strip length 5mm
Metal-insulator ( Duroid )-metal
Area 2.4mm×3mm
εr 10.2
tanδ 0.002
h 0.635mm
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Measured and simulated results
Measured
1.5-dB passband 1.69~3.1GHz
Simulated
Inductance 3.53nH
Capacitance 1pF
Center frequency 2.67GHz
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Finite-ground coplanar waveguide (FGCPW)-to-coplanar stripline (CPS)
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Measured and simulated results
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Measured power losses
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Marchand-balun-type
‧The conventional Marchand-balun-type structure and S21 (dB)
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Marchand-balun-type
Ls
Strip width 0.4mm
Strip length 5.5mm
Cs
Finger width 0.4mm
Finger length 2.9mm
Gap width 0.2mm
Lp
Rr 2.1mm
Gap width 1mm
Cp
Finger width 0.5mm
Finger length 2.2mm
Gap width 0.3mm
LC Total area
(λ/7) (λ/10)and(λ/8) (λ/12)‧ ‧
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Measured and simulated results
Measured
1.5-dB passband
1.12~4.38GHz
Simulated
Ls 3.75nH
Cs 0.75pF
Lp 7.5nH
Cp 0.375pF
Center frequency
3GHz
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Marchand-balun-type
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Measured and simulated results
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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.
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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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References
[1] K. C. Gupta, R. Garg, I. Bahl, and P. Bhartia, Microstrip Lines and Slotlines, 2nd ed. Norwoodl, MA: Artech House, 1996, ch. 5 and 7.
[2] M. Riaziat, R. Majidi-Ahy, and I.-J. Feng, “Propagation modes anddispersion characteristics of coplanar waveguides,” IEEE Trans.Microwave Theory Tech., vol. 38, pp. 245–251, Mar. 1990.
[3] L. Fan and K. Chang, “Uniplanar power dividers using coupled CPW and asymmetrical CPS for MIC’s and MMIC’s,” IEEE Trans.Microwave Theory Tech., vol. 44, pp. 2411–2419, Dec. 1996.
[4] F. L. Lin, C. W. Chiu, and R. B. Wu, “Coplanar waveguide bandpass filter—A ribbon of brick wall design,” IEEE Trans. Microwave Theory Tech., vol. 43, pp. 1589–1596, July 1995.
[5] L. Fan, B. Heimer, and K. Chang, “Uniplanar hybrid couplers using asymmetrical coplanar strip lines,” in IEEE MTT-S Int. Microwave Symp. Dig., 1997, pp. 273–276.
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[7] Y.-D. Lin and S.-N. Tsai, “Coplanar waveguide-fed uniplanar bow-tie antenna,” IEEE Trans. Antennas Propagat., vol. 45, pp. 305–306, Feb. 1997.
[8] C.-H. Ho, L. Fan, and K. Chang, “Experimental investigations of CPWslotline transitions for uniplanar microwave integrated circuits,” in IEEE MTT-S Int. Microwave Symp. Dig., 1993, pp. 877–880.
[9] K. Hettak, N. Dib, A. Sheta, A. A. Omar, G.-Y. Delisle, M. Stubbs, and S. Toutain, “New miniature broad-band CPW-to-slotline transitions,” IEEE Trans. Microwave Theory Tech., vol. 48, pp. 138–146, Jan. 2000.
[10] V. Trifunovic´ and B. Jokanovic´, “Review of printed Marchand and double Y baluns: Characteristics and application,” IEEE Trans. Microwave Theory Tech., vol. 42, pp. 1454–1462, Aug. 1994.
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References
[11] K.-P. Ma and T. Itoh, “A new broadband coplanar waveguide to slotline transition,” in IEEE MTT-S Int. Microwave Symp. Dig., 1997, pp. 1627–1630.
[12] Y.-S. Lin and C. H. Chen, “Design and modeling of twin-spiral coplanar waveguide-to-slotline transitions,” IEEE Trans. Microwave Theory Tech., vol. 48, pp. 463–466, Mar. 2000.
[13] L. Zhu and K. Wu, “Hybrid FGCPW/CPS scheme in the building block design of low-cost uniplanar and multilayer circuit and antenna,” in IEEE MTT-S Int. Microwave Symp. Dig., 1999, pp. 867–870.
[14] S.-G. Mao, C.-T. Hwang, R.-B. Wu, and C. H. Chen, “Analysis of coplanar waveguide-to-coplanar stripline transitions,” IEEE Trans. Microwave Theory Tech., vol. 48, pp. 23–29, Jan. 2000.
[15] Y.-S. Lin and C. H. Chen, “Novel lumped-element coplanar waveguide- to-slotline transitions,” in IEEE MTT-S Int. Microwave Symp. Dig., 1999, pp. 1427–1430.
[16] S. S. Gevorgian, T. Martinsson, L. J. P. Linner, and E. L.Kollberg, “CAD models for multilayered substrate interdigital capacitors,” IEEE Trans. Microwave Theory Tech., vol. 44, pp. 896–904, June 1996.
[17] M. Ribo, J. de la Cruz, and L. Pradell, “Circuit model for slotline-tocoplanar waveguide asymmetrical transitions,” Electron. Lett., vol. 35, pp. 1153–1155, July 8, 1999.
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