selected applications of tunable materials for … materials for microwave components ......
TRANSCRIPT
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Selected Applications of Tunable Materials for Microwave Components
Matthias Maasch, Onur Hamza Karabey, Sebastian Strunck and Rolf Jakoby
Mircowave Engineering, Technische Universität Darmstadt
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ETiT | Mikrowellentechnik „ Microwave Engineering | CST User Group Meeting 2010 | 2
Tunable Materials for Microwave Components
Phase shifter in antenna arrays for beam forming
Matching networks
Power amplifiers
Implementation of tunability by using
Liquid Crystal above 10GHz
Ferroelectrics (Barium-Strontium-Titanate) below 15GHz
Metamaterials
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Outline
Coaxial Transmission Line for Liquid Crystal Charaterization
Thermal Effects in Interdigital Capacitors
Tunable SRR loaded Waveguide
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Coaxial Transmission Line for Liquid Crystal Charaterization
Thermal Effects in Interdigital Capacitors
Tunable SRR loaded Waveguide
![Page 5: Selected Applications of Tunable Materials for … Materials for Microwave Components ... Ferroelectrics (Barium-Strontium-Titanate) ... LC Characterization Setup](https://reader030.vdocuments.site/reader030/viewer/2022021511/5add5a117f8b9a9a768cc689/html5/thumbnails/5.jpg)
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LC Characterization Setup
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LC Characterization Setup
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10 20 30 40 50-5
-4
-3
-2
-1
0
f (GHz)
|S2
1|/d
B
no EM leakage
incl. EM leakage
EM Leakage through Filling Channels
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Simulated Impact of Filling Channels
Karabey et al. “Precise Broadband Microwave Material Characterization of Liquids” EuMW 2010
Error due to EM leakage: r’ : <6% r’’ : <40%
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Coaxial Transmission Line for Liquid Crystal Charaterization
Thermal Effects in Interdigital Capacitors
Tunable SRR loaded Waveguide
![Page 10: Selected Applications of Tunable Materials for … Materials for Microwave Components ... Ferroelectrics (Barium-Strontium-Titanate) ... LC Characterization Setup](https://reader030.vdocuments.site/reader030/viewer/2022021511/5add5a117f8b9a9a768cc689/html5/thumbnails/10.jpg)
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Interdigital Capacitor on BST
r of BST is tunable by static E-field
Cheap printing technology
Better linearity compared to semiconductor varactors
High power capability ‟ thermal effects?
Alumina (250µm)
BST (10µm)
Gold (3µm)
Gold (3µm)
+VDC
-VDC
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Simulated Temperature
IDC size: 200x600µm2
Gap width: 20µm
Finger width: 20µm
BST RF properties
r = 200, tan = 0.02
RF input power:50W @ 2GHz
Maximum temperature ≈ 52°C
Temperature inside BST layer ≈ 37°C
He “Heat capacity, thermal conductivity, and thermal expansion of barium titanate-based ceramics” Thermochimica Acta, 2004
BST
Alumina
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Coaxial Transmission Line for Liquid Crystal Charaterization
Thermal Effects in Interdigital Capacitors
Tunable SRR loaded Waveguide
![Page 13: Selected Applications of Tunable Materials for … Materials for Microwave Components ... Ferroelectrics (Barium-Strontium-Titanate) ... LC Characterization Setup](https://reader030.vdocuments.site/reader030/viewer/2022021511/5add5a117f8b9a9a768cc689/html5/thumbnails/13.jpg)
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Tunable SRR loaded Waveguide
Maasch et al. “Voltage Tunable Split-Ring-Resonators for Waveguide Applications” Metamaterials 2009
Introduction of tunability to Split Ring Resonators by loading the gap
Phase shifter, filter inside a waveguide
Step towards voltage tunable 3D Metamaterial
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DC-Biasing of SRR Array
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Simulated Impact of Bias Elements
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Simulation of Tuning
theoretical tuning range: 0.7…2.4GHz
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Measurement Setup
9 SRRs with 9x9mm2
Substrate: RT/duroid 5880, t=0.38mm
Biasing Resistor
Varactor Diode
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Measurement Results
measured tuning range: 0.9…2.2GHz
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Thank you for your attention.