SEMCAD is a three-dimensional all-electromagnetic simulation design software developed by SPEAG of Switzerland for electromagnetic compatibility (EMC), antenna system design and bioelectromagnetism. It originated from the alternating direction implicit time-domain finite difference (ADI-FDTD) algorithm developed by the Swiss Federal InsTitute of Technology to fully address electromagnetic compatibility in the fields of radio equipment, biomedical, automotive electronics, etc. Sexual problems.
SEMCAD software has a wide range of applications in electromagnetic compatibility, antenna system analysis and design, microwave circuits, electromagnetic scattering, optical devices, automotive electronics, bioelectromagnetics, medical and medical fields. It can help electromagnetic related departments and system design engineers avoid costly in the prototype or manufacturing stage, and transfer design risk to the numerical simulation stage of the computer, which enables enterprises to reduce design time, reduce design cost, improve product quality and reliability. Shorten the time to market and ultimately increase corporate profits. The use of electromagnetic simulation analysis software, product design and verification with high-performance computing simulation has become an essential means in the production and research and development fields.
At present, SEMCAD has become a standard toolkit for electromagnetic simulation design in the fields of EMC and antenna design, with its high-performance FDTD solver, unparalleled calculation speed and powerful multi-objective multi-parameter multi-frequency optimization function. , medical, aerospace, aerospace, automotive and other industries provide effective electromagnetic design solutions.
1 Powerful modeling capabilities and rich CAD model interface
SEMCAD adopts the international 3D modeling kernel ACIS of CAD and CAE software. The operation interface is completely Windows style, easy to learn and use. QTech calculation engine can easily process more than 10,000 CAD components, support full parametric modeling, group models into any two-dimensional, three-dimensional array, boolean operation, scan, stretch, translation , rotation, mirroring, face-to-face and other functions.
SEMCAD provides a rich software interface that seamlessly interfaces with CAD software such as Pro/E, UG, CaTIa and Solidworks. SEMCAD software has a powerful model interface function, can import files in multiple formats, including SAT, IGES, Pro/E, STEP, CATIA V4, CATIA V5, 3DS, STL and DXF files, and has a special Gerber for PCB boards. interface. SEMCAD also provides fixes for importing models.
Algorithm is the core of software, the soul of computer simulation and design. SEMCAD's core basic algorithm, the finite-difference time domain (FDTD) method, has been proved to be one of the most versatile and widely used methods for solving electromagnetic fields in computational electromagnetics. The FDTD method has the following basic advantages:
1). Direct time domain calculation: one simulation can simulate all broadband characteristics;
2). Wide applicability: suitable for simulating a space electromagnetic environment containing arbitrary complex structures and arbitrary media distribution;
3). Saving storage space and computing time: The required memory and simulation time are proportional to the number of spatial grids.
SEMCAD has the most advanced FDTD algorithms, including C-FDTD (conformal FDTD) and unconditionally stable ADI-FDTD, which effectively reduce grid error. ADI-FDTD eliminates the dependence of time step size on grid size and provides favorable support for simulating small-scale structures in large systems. SEMCAD is the world's first commercial electromagnetic simulation software using C-ADI-FDTD, an efficient algorithm.
Ø Yee-FDTD solver. The optimized Yee Grid FDTD solver solves 20-40 megacells per second on a P4 machine running at 3.4 GHz. The 64-bit solver supports complex problem solving with more than 1 billion degrees of freedom.
Ø C-FDTD solver. The conformal FDTD algorithm includes conductor conformal technology and medium conformal technology. It gets rid of the large number of step approximations of the standard FDTD grid, effectively reduces the grid error and greatly improves the calculation accuracy.
Ø ADI-FDTD solver. ADI-FDTD can get rid of the dependence of time step on grid size, and it can be unconditionally stable, which provides the possibility to simulate small-scale structures in large systems.
Ø C-ADI-FDTD solver. Combines C-FDTD and ADI-FDTD algorithms.
Ø EM-T solver. The electromagnetic and thermal coupling solver provides a powerful electromagnetic and thermal analysis platform, which brings great convenience to human SAR analysis, equipment thermal analysis and EMC joint design.
Ø EM-SPICE solver. Circuit and electromagnetic field joint solver.
In addition, SEMCAD has a low-frequency electromagnetic field solver that can analyze static fields, an independent thermal solver, and a parallel FDTD solver.
SEMCAD software has a variety of optimization design functions based on genetic algorithm (GA), providing a convenient design tool for improving product quality. The optimization functions are summarized as follows:
SEMCAD has powerful visual post-processing functions, which can output transient or steady-state electromagnetic field quantities (P, B, D, Eç€, J, S, etc.) parameters, as well as the following visual post-processing functions:
Ø Arbitrary 2D and 3D field distribution and dynamic display Ø Can output Cartesian, Polar and Smith charts Ø Near-field and far-field parameters (TIS, TRP, RCS, etc.), antenna parameters, Z, U, I, P, etc. Ø SAR distribution, average SAR (Av. 1g/10g / arbitrary IEEE 1529)
Ø Multi-port S-parameter calculation (waveguide, microstrip line, etc.)
Ø Automatic failure mode and consequence analysis (FMEA)
Ø Comparative analysis of multiple results Ø Output time domain or frequency domain data (FFT, DFT), can be saved as Text, Word, Excel and other format files Ø Data can be output to the circuit analysis package to achieve field-circuit coupling solution Ø Display results Directly stored as an image file Ø can import DASY4, DASY5, iSAR measurement data (near field, far field), directly compare
SEMCAD has powerful analytical capabilities for a variety of complex materials, and the materials that can be analyzed are summarized as follows:
6 Complete standard human body model library
SEMCAD provides a complete library of international standards for bioelectromagnetics, with a model resolution of less than 0.1 mm. When solving the problem of bio-electromagnetic compatibility, users can easily import various complex human body models directly. The human model library includes all international standard models for children, adults, seniors, adolescents, males, females, human brains, bones, blood vessels, Europeans, Asians, and so on. SEMCAD has a variety of hand models that can be manipulated to easily adjust various poses of the 3D mannequin. In addition, SEMCAD also provides a standard library of animal models (such as mice) and a library of medical device models (such as nuclear magnetic resonance MRI systems).
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