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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 University
0
Department of Electronic Engineering
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
‧CPW-to-slotline layout
Finger width
0.5mm
Finger length
3.4mm
Gap width
0.2mm
LC Total area
(λ/28)‧(λ/12)
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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 lumpedelement circuit and the transmission lines are not
taken into account.
‧CPW-to-slotline equivalent-circuit model
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Measured and simulated results
‧Measured:HP8510 network
analyzer with thru-reflect-line (TRL)
calibration
‧Simulated : based on the
equivalent-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
6
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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