xiaoyu cheng advisor: dr.yong-kyu yoonoss.jishulink.com/caenet/forums/upload/2014/01/14/389/... ·...
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Xiaoyu Cheng
Advisor: Dr.Yong-Kyu Yoon
Agenda HFSS Fundamentals
Case Study:
Transmission line
Basic SRR Antenna
Waveguide Loaded with SRR
Advanced Features
Q&A
HFSS: What’s this? High Frequency Structure Simulator
3D Simulator using FEM (Finite Element Method)
HFSS: How Accurate? HFSS v.s. Agilent E5071C after calibration
5 6 7 8 9 10 11 12-50
-40
-30
-20
-10
0
Frequency (GHz)
S1
1 a
nd
S2
1 (
dB
)
S11 Sim
S21 Sim
S11 Meas
S21 Meas
HFSS: Interface
Project Manager
Variables
Message Progress
3D Modeler
HFSS: First Thing First Solution Type Setup (HFSS>>Solution Type)
S-Parameter based on Power; for Microstrips, waveguides, (non-TEM modes) Higher modes in WG
S-Parameter based on V, I ; for multipiece conductor such As CPW, CBCPW, coaxial(TEM modes)
Eigenmodes, or resonances, of a structure.
Time Domain Response
HFSS: Before Your Drawing What’s the blank area?
They are PERFECT CONDUCTORS!(NOT AIR)
Most of the cases, you need an air box enclosing your circuit
HFSS: Your Model Most tools are easy to handle
Equation based surfaces, helix and coils are tricky. (Understand the meaning of rotating along the vector)
HFSS: Drawing Make your model “as central as possible”: Symmetric
will ease your drawing using rotation and duplication function
Use variable as much as you can(optimization)
HFSS: Drawing Make sure you have “Air-box” around your structure
(Why? -> P7)
Air box should be at LEAST as large as quarter wavelength of your lowest frequency of interest
Air boxes with unnecessary large volume will increase your simulation time.
Usually you need “Radiation” boundary on each side of the air box
HFSS: Excitation Wave Port: Stays ON the air box; has “Deembed”
function, ideal for Waveguide, microstrip
Lumped port: Embedded on the structure, for CPW/ CBCPW
HFSS: Waveport If you are using Driven Terminal: Choose your
reference conductor (GND)
If you are using Driven Model: Draw your “Integration line”: GND->Trace
HFSS: Lumped Port Similar with Waveport, but it does not necessarily stay
on the Air box
Only excite simplified single mode excitation, cannot perform deembed
HFSS: Port Size You are responsible to draw a 2D planar rectangular as
your port (except WG)
The standard recommendation for most CPW wave ports is a rectangular aperture
Port width should be no less than 3 x the overall CPW width, or 3 x (2g + w)
Port height should be no less than 4 x the dielectric height, or 4h
HFSS: Port Size Microstrip WavePort : at LEAST 5*TraceWidth
(Preferably 8x), 5*SubstrateThick (10x)
Run a “Port Only“ simulation to determine if the port size is correct (Quasi-TEM)
HFSS: Solution Setup Add a Setup
Solution Frequency: will be detailed later
Number of Passes: 10-20
Delta S: 0.02 (Default) <-> Accuracy
HFSS: Frequency Sweep Solution Frequency depends on Sweep type:
Fast: Narrow band application: Antenna
Discrete: Equivalent to discrete sweep on VNA
Good for broadband application
Interpolating: Do discrete computing on less number of points(such as 50), more number of points (401 or 801) will be interpolated based on the actually calculated points
HFSS: First Simulation If you are targeting very high performance system,
simulation of transmission line is suggested
Transmission line can be designed by TxLine (www.AWR.com), then a full wave FEM analysis is needed in HFSS for best results.
Case 1: Microstrip Line Design Substrate: Rogers RT/Duroid 5880 (k=2.2, thickness =
25mil, Half oz Cu coated, loss tan = 0.0009)
Wavelength
Trace Width
Case 1: Microstrip Line Design Create your model
Case 1: Microstrip Line Design When Symmetric: Two Ports
Case 1: Microstrip Line Design Before Frequency Sweep, run a “Solve Port Only”
analysis: Make sure port size is acceptable
Case 1: Microstrip Line Design E-Field is displayed; Quasi-TEM mode is observed as
the same on your textbook
Case 1: Microstrip Line Design
Case 1: Microstrip Line Design Before Plotting the results
Case 1: Microstrip Line Design
Case 1: Microstrip Line Design
Case 1: Microstrip Line Design
Case 1: Microstrip Line Design
Case 2: An SRR Antenna X. Cheng, D.E. Senior, J.J. Whalen and Y.K.Yoon,
“Electrically Small Tunable Split Ring Resonator Antenna ” IEEE Antenna and Propagation Symposium (AP-S) 2010, Jun.2010, Toronto, Canada, pp.1-4
Case 2: An SRR Antenna Microstrip: Driven Terminal, Waveport, Fast Sweep
Port Validation
Solution: Solution Freq. = Center Freq. (ANT) Fast Sweep
Case 2: An SRR Antenna # of adaptive passes : 30 (Huge!)
Case 2: An SRR Antenna
Dual Band! But why?
Case 2: An SRR Antenna Field Distribution
2.1GHz 3.8GHz
Case 2: An SRR Antenna 3D Radiation Pattern
Antenna Parameters
Case 3: Waveguide Loaded with SRR X.Cheng, J.Shi, P.Jao, D.E.Senior and Y.K. Yoon,
“Reconfigurable split ring resonator array loaded waveguide for insitu tuning” IEEE Antenna and Propagation Symposium (AP-S) 2011, Jul.2011, Spokane, WA, pp. 2947 - 2950
Case 3: Waveguide Loaded with SRR
Case 3: Waveguide Loaded with SRR
Case 3: Waveguide Loaded with SRR E-Field at 4GHz (TE10 mode, Transmission)
Case 3: Waveguide Loaded with SRR E-Field at 1.6GHz (Evanescent mode)
Case 3: Waveguide Loaded with SRR
Case 3: Waveguide Loaded with SRR
Case 3: Waveguide Loaded with SRR
Advanced Features Field Plotting
Select the plane which the 3D field will be projected on
Select the parameter of interest
Advanced Features Mesh Assignment (nano- and submicro structures)
Advanced Features Optimization (project properties) and tuning
Advanced Features Wrap sheet (HFSS 13.0 only)
Q&A
Multidisciplinary Nano and Microsystems Laboratory
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