Research activities of the IMP utilizing CST MicrowaveStudio European User Conference 2013
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1 Research activities of the IMP utilizing CST MicrowaveStudio European User Conference ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 1
2 Outline Varactor design based on a tunable ceramic Alex Wiens et al. Tunable polarizer based on Liquid Crystal (LC) Sebastian Strunck Cavity sensor for Schottky measurements at particle accelerators ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 2
3 Varactor Design based on a tunable ceramic Varactors are part of tunable matching networks e.g. π-network Multi-band/multi-standard requirements Wifi, LTE, UMTS etc. Software defined radio Aim: Multi-band coverage with single transistor type ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 3
4 Varactor Design: Barium-Strontium-Titanate Ceramic material Nonlinear polarization dependent on electrical field Metal BST Alumina ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 4
5 Varactor Design on BST Thick Film Varactor realized as Inter-Digital-Capacitor integrated DC Bias-Network Aim: high tunability (ΔC/ΔU Bias ) ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 5
6 Varactor Design: Simulation Varactor Model construction Electrostatic solver on a homogenious substrate Local field analysis Construct tuned substrate based on a BST tunability model RF simulation to extract S-Parameter ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 6
7 Varactor Design: Macro for tuned substrate ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 7
8 Outline Varactor design based on a tunable ceramic Alex Wiens et al. Tunable polarizer based on Liquid Crystal (LC) Sebastian Strunck Cavity sensor for Schottky measurements at particle accelerators ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 8
9 Tunabel polarizer based on Liquid Crystal (LC) Liquid crystal Uniaxial crystals anisotropic material nemantic phase ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 9
10 Tunabel polarizer based on Liquid Crystal (LC) Elliptical Waveguide, twisted ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 10
11 Tunabel polarizer based on Liquid Crystal (LC) Cylindrical waveguide filled with LC Orientation of LCs causes electrically elliptical waveguide Aim: high transmission and low polarization crosstalk Need for a full tensor material ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 11
12 Tunabel polarizer based on Liquid Crystal (LC) Expansion of the Create full tensor material -macro allows creation of multiple slices with certain thickness and rotation angle ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 12
13 Tunabel polarizer based on Liquid Crystal (LC) Simulation at 50 GHz 90 Twist of Polarisation, 20 LC elements providing a per step rotation of 4, ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 13
14 Tunabel polarizer based on Liquid Crystal (LC) ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 14
15 Outline Varactor design based on a tunable ceramic Alex Wiens et al. Tunable polarizer based on Liquid Crystal (LC) Sebastian Strunck Cavity sensor for Schottky measurements at particle accelerators ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 15
16 Cavity sensor for Schottky measurements Goal: Design a Schottky Sensor with very high sensitivity to detect smallest beam-currents down to single particles for the Collector Ring at FAIR. Schottky Noise: Current fluctuation caused by the discrete charge carriers Gives insight about the energy/frequency distribution of the particles Cavity is used as a resonant sensor ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 16
17 Cavity Sensor: Principle Charged particles couple to E-field Circular waveguide resonator pillbox First two modes with E-Field in direction of particle movement Excitation of monopole mode around 10^4 times stronger Monopolmode - TM 010 Dipolmode - TM ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 17
18 Cavity Sensor : Pillbox Pillbox cavity Nose length (z) & heigth (radial) radius couple slot cavity length ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 18
19 Cavity Sensor: Waveguides heigth waveguides/resonators width length coupling slots (length & width) ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 19
20 Cavity Sensor ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 20
21 Cavity Sensor: Eigenmodes Monopole mode not expanded into waveguides Dipole mode expanded into waveguides ETiT Institute of Microwave Engineering and Photonics 21
22 Cavity Sensor: Optimization Matlab is used to control MWS Optimization of R/Q-value with the Eigenmode Solver R/Q is a measure for the energy transfer between particle and cavity dependent on geometry only differrent geometry for the nose Monopole mode frequency is kept as 200 MHz by adjusting the cavity radius Different dimensions of coupling slot detune cavity modes and waveguide resonator eigenmode frequencies Monopole mode at 200 MHz again with adjusting cavity radius Waveguide length optimized to scope with changed dipole mode frequency ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 22
23 Cavity Sensor: Optimization Matlab is used to control MWS Optimization of R/Q-value with the Eigenmode Solver R/Q is a measure for the energy transfer between particle and cavity dependent on geometry only differrent geometry for the nose Monopole mode frequency is kept as 200 MHz by adjusting the cavity radius Different dimensions of coupling slot detune cavity modes and waveguide resonator eigenmode frequencies Monopole mode at 200 MHz again with adjusting cavity radius Waveguide length optimized to scope with changed dipole mode frequency ETiT Institute of Microwave Engineering and Photonics 23
24 Cavity Sensor: Measurement vs. Simulation ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 24
25 Cavity Sensor: Measurement vs. Simulation ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 25
26 Thank you. The work presented in this slides was done by Alex Wiens and Holger Maune et al., Sebastian Strunck et al. and Matthias Hansli et al ETiT Institute of Microwave Engineering and Photonics Matthias Hansli 26
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