Presentation is loading. Please wait.

Presentation is loading. Please wait.

Software Tools for Microwave Research, Design, and Education

Similar presentations

Presentation on theme: "Software Tools for Microwave Research, Design, and Education"— Presentation transcript:

1 Software Tools for Microwave Research, Design, and Education
Dejan V. Tošić Milka Potrebić School of Electrical Engineering Belgrade

2 Overview Introduction Microwave Office WIPL-D Microwave
Ansoft Designer Simulation example Benefits Conclusion

3 Objective Compare software tools for microwave circuit simulation from the research, design, and educational view point Identify a candidate tool for each category Highlight teaching aspects

4 Considered Microwave Tools
AWR Microwave Office – MWO WIPL-D Microwave Ansoft Designer

5 Introduction (1) As we move towards a learner-oriented, self-paced, asynchronous system for higher and continuing education, the traditional course-based curriculum structure must be examined for its efficiency Courses can be restructured into primary concept modules that are interlinked to reflect the logical development of knowledge in the domain of the discipline being studied

6 Introduction (2) With the wireless revolution, brought on mostly by cellular radio technologies, microwave applications have come to dominate the industry Cost, time to market, and manufacturing capacity are much stronger influences within the microwave engineering Cost versus performance will always be a trade-off within any engineering project, however, the weighting coefficients have shifted

7 Why is it important ? Software tools are indispensable in microwave engineering, so R & D, design, and the corresponding courses should always address computer aided design simulation prior to manufacturing

8 Who is using microwave software tools ?
Engineers Practitioners Researchers Academia

9 AWR Microwave Office (MWO)

10 What is MWO? Popular microwave software environments in both academia and industry Professional design tool Linear & nonlinear solution for microwave hybrid, module and MMIC design Includes linear, harmonic-balance, time-domain, electromagnetic (EM) simulation, physical layout Frequency domain simulator

11 2.5D EM Layered Structures
EM simulation is based on 2.5D solver for layered structures (microstrip filters & antennas) with predefined objects (rectangle, polygon, path, ellipse, drill hole, edge port, via, ...) Only automatic mashing in three levels

12 Layout view Layout view can be generated from the schematic to take into account mutual coupling, parasitics, discontinuities, … Layout structure can be analyzed by 2.5D EM solver

13 Optimization Optimizer for circuit model parameters without possibility to optimize physical structure Tuning – manual optimization

14 Transmission Line Calculator

15 Filter Synthesis Wizard


17 What is WIPL-D Microwave?
New design and simulation tool for microwave projects involving microwave circuits, components, and antennas Full wave 3D EM solver

18 Features Predefined circuit components & arbitrary composite metallic and dielectric structures defined by user Circuit parameters of the included 3D EM components are computed on-the-fly Intended for engineers, practitioners, researches, academia, and as a teaching tool for microwave engineering curricula

19 Defining structures by means of (non)uniform grids

20 Advanced modeling concepts
Using symmetry to facilitate analysis Modeling of the end effect and feed area for thick wires Coaxial line excitation

21 Edging & De-embedding Modeling of layered structures De-embedding of circuit parameters from the 3D EM analysis Taking the edge effects into account

22 Ideal Palette Contains all basic components for
introductory microwave courses short circuited end open-circuited end amplifier ideal transformer circulator symmetric power splitter quadrature hybrid coupler

23 Technology-related palettes
Microstrip Not available in MWO double step & patch antenna Coaxial Rectangular Special components coaxial taper, band, step, gap, T-junction & cross Special components E- and H-post, E- and H-band, ET- and HT-junction, E- and H- coupled waveguides, rectangular horn antenna & magic tee junction Transitions Special components transitions from coaxial to rectangular or microstrip technology

24 Electrical length of ports
Ports of each component can be electrically extended – equivalent transmission lines can be added to ports Schematic can contain fewer elements and one can experiment with shifting reference planes which define component ports

25 3D EM models 3D EM modeling provides predefined objects dielectric domains, wires, plates, sphere, circle, reflector, and body of revolution transition between two coaxial cables half-sphere with a hole ring with circular cross ring with a square cross sections Symbolic parameters of 3D EM models can be optimized

26 Ideal, analytical, and 3D EM component characterization
3D EM analysis enables to explore differences between the results generated by analytical closed-form equations and accurate EM numerical simulations 3D EM models can be made when the component parameters are out of the range over which the analytical model is valid Multiple component characterization: ideal or analytical or 3D electromagnetic Analytical (Recommended):

27 Versatile input options
Characteristic impedance & Normalized length Physical dimensions


29 What is Ansoft Designer ?
High-performance RF/mW Design & Analog/RFIC Verification Ansoft Designer provides an integrated schematic and design management front-end for complex analog, RF and mixed-signal applications By leveraging advanced electromagnetic-field simulators dynamically linked to powerful circuit and system simulation, Ansoft Designer enables engineers to design, optimize and validate component, circuit, and system performance long before building a prototype in hardware

30 Features (1) Digital-communication-system simulation
Nonlinear circuit simulation, frequency domain, and transient analyses Planar 3D EM simulation Integrated IC and PCB layout editor with Java and Visual Basic scripting Impulse invariance convolution engine Swept parameter analysis

31 Features (2) Support of parameterized subcircuits, global variables, and parameter scoping Support of compiled and interpretive user-defined models (UDMs & SDDs) Design utilities, including real-time tuning filter and TRL synthesis and load-pull analysis Advanced design environment with dynamic project manager and solution caching Dynamic link with HFSS, 3D electromagnetic structure simulator

32 Circuit, Physical Layout, and Planar EM model

33 Circuit libraries Online

34 Example component parameters
Microstrip Transmission Line, Physical Length - MSTRL

35 Planar EM model Full 3D EM simulation
Predefined objects: circle, rectangle, arc, line, polygon, void, hole, via (2.5D or 3D), cavity, … Symbolic parameters of 3D EM models can be optimized Estimate Module – Planar EM Calculator Microstrip line Quarter-wave transformer Tuning stub Rectangular patch Circularly polarized (CP) patch

36 Meshing Fixed meshing with edge meshing Adaptive meshing

37 Optimization … to determine how each design variation affects the performance of the design Optimetrics changes the design parameter values to meet the goal … to determine the sensitivity of the design to small changes in variables Optimetrics determines the distribution of a design's performance

38 Filter Design Wizard

39 Transmission Line Calculator

40 Microstrip lowpass filter
Simulation example Microstrip lowpass filter

41 Specification Source/load impedance

42 Realization Seven-pole lowpass filter with Chebyshev response

43 Implementation Microstrip technology, fabricated on substrate with relative dielectric constant and thickness without losses Open-circuited stubs implementation is chosen with high impedance lines as and a line width Open-circuited stub has a line width

44 Simulation models An important issue is to demonstrate
differences between various simulation models Analytical 2.5D EM (MWO) 3D EM (WIPL-D Microwave, Ansoft Designer)

45 Example in MWO Schematic 2.5D model

46 Example in WIPL-D Microwave
Schematic 3D model

47 Example in Ansoft Designer
Schematic 3D model

48 Simulation results (1) Ansoft Designer WIPL-D MW MWO

49 Simulation results (2) WIPL-D MW MWO Ansoft Designer

50 Simulation results (3)

51 Amplitude difference measure (of the frequency response)
3D WIPL-D model & 2.5D MWO model

52 and potential disadvantages
Benefits and potential disadvantages

53 Benefits (1) WIPL-D Microwave is a candidate tool for implementing efficient microwave education From the teaching view point, it has the following benefits Contains all components and microwave circuit models needed for undergraduate microwave courses Ideal microwave elements are grouped into a separate toolbar, so the student easily builds idealized microwave circuits

54 Benefits (2) Numerous teaching examples are available and are based on the widely used textbooks adopted in many microwave courses Comprehensive review of microwave circuit basics is provided, so students can quickly review the scattering matrix properties, element definitions, and other background lessons Full wave 3D EM analysis is available so the student can compare the results generated by analytical closed-form equations and accurate EM numerical simulations

55 Benefits (3) Multiple component characterization is provided so the student can specify a component as ideal or analytical or 3D electromagnetic Technology-related components have integrated parameters and technology descriptors Arbitrary metallic-dielectric structures can be characterized by, for example, scattering parameters and incorporated into the schematic when the components parameters are out of the range over which the analytical model is valid

56 Benefits (4) WIPL-D optimizer can optimize all schematic parameters including the parameters of the embedded 3D EM models Ports consist of transmission lines with adjustable length that can be set to an arbitrary value, so a schematic can be built with fewer elements WIPL-D is affordable for students because of its low price

57 Potential disadvantages
Time response can not be computed Nonlinear circuits can not be simulated Subcircuits are not available Graphical presentation of the simulation results by default smoothes data (fitting tool) that might lead to unexpected curves (peaks); this might confuse students and cause them to misinterpret the results

58 Benefits Provides nonlinear microwave circuits and systems
Physical layout representation is assigned to each component in a schematic, but this option does not always give correct layout Arbitrary 2.5 D EM multi-layer structures can be incorporated into the schematic MWO can not optimize physical structure, but it has a powerful manual and automatic optimizer for circuit model parameters Computes the time-domain response Subcircuits can be used in the schematic realization Filter design wizard

59 Potential disadvantages
Numerous components and their grouping sometimes might be confusing for undergraduate students Layered EM structures can be modeled but cannot be optimized Abundant advanced examples may not be suitable for undergraduate teaching process MWO is not so affordable for students because of its high price

60 Benefits (1) Provides nonlinear microwave circuits and systems
Physical layout representation is assigned to each component in a schematic and it can be automatically exported to planar electromagnetic model Full wave 3D EM analysis with possibility to incorporate arbitrary 3D EM multi-layer structures into the schematic Ansoft Designer has a powerful manual and automatic optimizer for circuit and 3D EM model parameters

61 Benefits (2) Multiple component characterization is provided as analytical or 3D electromagnetic Technology-related components have predefined global substrates Computes the time-domain response Subcircuits can be used in the schematic realization Calculators: EM estimator Transmission line calculator Filter design wizard

62 Potential disadvantages
No transition components (release 2004) Might be over-sophisticated for students Comparatively high prize

63 Feature MWO WIPL-D Ansoft
Full 3D simulation No Yes Yes 2.5D & 3D Predefined object Basic Basic Basic & Complex Uniform/Non-uniform grid (EM model) Uniform Uniform & Non-uniform Uniform Symbolic variables No Yes Yes Optimization No Yes Yes Symmetry planes No No Yes Automatic check Yes Yes Yes Yes Yes Yes De-embedding Edging Automatic Automatic Automatic & Manual EM estimator No Yes No Nonlinear components Yes Yes No Circuits & Systems Transitions Only ideal Only ideal Yes Symbolic variable Yes Yes Yes Circuit optimization Yes Yes Yes Layout (implementation) view Yes Yes No Functional blocks (systems) Yes Yes No Transmission line calculator Yes Yes Basic Filter design wizard Yes Yes, complex No Measures S, Y, Z, G, H, ABCD, V, I, P Yes Yes Not all, such as: G,H, ABCD Time domain reflectometry Yes Yes No Near/Far field radiation Far Near & Far Near & Far Cost Price Very high Very high Low

64 Conclusion (1) We have evaluated and compared microwave software tools
Two professional tools: Microwave Office (7.0 beta 2006) Ansoft designer (release 2004) New software tool: WIPL-D Microwave (December 2005) Research, design, and teaching aspects were considered

65 Conclusion (2) WIPL-D Microwave: Teaching, Introductory microwave courses Ansoft Designer: The most versatile from all view points Microwave Office: The most convenient user interface, Suitable for research, design, and advanced microwave courses

Download ppt "Software Tools for Microwave Research, Design, and Education"

Similar presentations

Ads by Google