Comsol rf module eigenfrequency In the module, these laws of physics are translated by the RF interfaces to sets of partial differential equations with corresponding initial and boundary Hello, I am simulating a microwave resonant cavity using the RF module (Electromagnetic Waves, Frequency Domain with Eigenfrequency study). In this paper the Radio Frequency module in its 3D Electromagnetic Waves, Frequency Domain formulation is used. EDT 0 Replies . In the Eigenfrequency study node you have the possibility to select the number of eigenfrequencies to compute, and the frequency around which you would like to search for these frequencies. However, when I simply switch from an eigenvalue study to an eigenfrequency study. Here, we mainly describe the study of eigenfrequencies in mechanical str I'm using 4. Introduction to Modeling Porous Media Flow. 1 introduces new features for electrostatic discharge and lightning pulses, the ability to define conductive boundaries quickly by clicking domains, RF Module Updates. Learn more about the news below. toto yopi . An explanation on how to model with a programming language is available in yet another book, the COMSOL Multiphysics Scripting Guide. Use the Eigenfrequency search method around shift list to control how the eigenvalue solver searches for eigenfrequencies around the shift value specified in the Search for eigenfrequencies around Learn about modeling periodic structures using COMSOL Multiphysics ® with the RF Module and Wave Optics Module. I am required to find a parameter with respect to the input power. To determine the right combination of products for your modeling needs, review the Specification Chart and make The combination of COMSOL ® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. 6 | RF COIL 4 Click Study. The denominator normalizes the value of the overlap M to lie between 0 and 1. Posted 2015年8月4日 GMT-4 03:43 Low-Frequency Electromagnetics, RF & Microwave Engineering, Studies & Solvers Version 4. 3 Click Browse. I'm not aware of COMSOL calculation of characteristic modes, but the software is commonly used to calculate quasi-normal modes of metallic nanostructures at optical frequencies (similar to your study). Introduction to Mechanical Resonance When a mechanical system is excited by a force whose frequency content matches the natural frequencies of the system, mechanical resonance can occur, leading to vibration with Comsol 3. I'm performing an eigenfrequency analysis of a model in the Comsol 4. 4 Browse to the model’s Application Wide Support for Eigenfrequency Analysis. The solver gives correct results (eigenmodes look like expected from analytical modeling), but I cannot see the values for the magnetic field components (emw. However, the interfacing principle can be adapted with minimal effort to any other third-party frequency-domain solvers, including simulation software dedicated to the design and simulation of high-frequency electronic products (antennas, RF or microwave † The RF Module Physics Interface Guide † Common Physics Interface and Feature Settings and Nodes † Selecting the Study Type † The RF Module Modeling Process † Where Do I Access the Documentation and Application Libraries? What Can the RF Module Do? The RF Module solves problems in the general field of electromagnetic waves, such as The combination of COMSOL ® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Natural frequencies appear in many types of systems, for example, as standing waves in a musical instrument or in an electrical RLC circuit. txt) or read online for free. Get an introduction to modeling flow in porous media using COMSOL The variables u_i and u_j represent two arbitrary eigenmode solutions. The value should reflect the order of magnitude of the first important nonzero eigenfrequency. It means that increasing the value of the I did eigenfrequency analysis to find the right operation mode, and the next step is to find thermal distribution at that frequency mode. GEOMETRY 1 Import 1 (imp1) 1 In the Home toolbar, click Import. The RF Module Physics Interfaces The RF Module physics interfaces are based on Maxwell’s equations or subsets and special cases of these together with material constitutive relations. The value of the Approximate number of eigenfrequencies will affect the Dimension of Krylov space used by the algorithm; see the Advanced section of the Eigenvalue Solver. Please login with a The latter is referred to as eigenfrequency analysis and can be used for finding resonant or natural modes and eigenfrequencies in a system of any possible dimension, including 2D, 2D axisymmetric, and 3D. Posted Nov 6, 2016, 8:25 p. m. Particular functionality may be common to several products. Particular functionality may When building geometries directly in COMSOL Multiphysics ®, the RF Module includes a Part Library that contains complex shapes frequently required for RF simulations: connectors, surface-mount devices, and waveguides. 6 introduces a new physics interface analyzing radar cross sections (RCS) asymptotically, a study step that runs a port sweep faster, and new This equation solves for the electric potential field, V, which gives us the electric field, \mathbf{E} = -\nabla V, and the current, \mathbf{J} = \sigma \mathbf{E}. That one performs a frequency domain analysis based on the modal (eigenfrequency) solution. When From study is selected, 1/8 in 2D or 1/5 in 3D of the vacuum wavelength from the highest The built-in functionality of the COMSOL Multiphysics ® software allows for solving these problems with gradient-based optimization. In the module, these laws of physics are translated by the RF interfaces to sets of partial differential equations with corresponding initial and boundary Using COMSOL Multiphysics and the RF Module, we can analyze the signal strength of an RF coil by solving for its resonance frequency and Q factor, among other properties. Joining Parametric Stationary Solutions such that one would assume that the eigenvalue λ should be related to the eigenfrequency k simply by λ = k². Hy, emw. Hz). Posted Jul 26, 2023, If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. Under the hood, the RF interfaces formulate and solve the differential form of The RF Module’s Model Library describes th e interfaces and their different features Note: This discussion is about an older version of the COMSOL Multiphysics Lumped Capacitor in the RF Module, eigenfrequency. COMSOL has a predefined study type for this one that creates an eigenfrequency step and automatically links its output to the frequency domain step. This example also uses the Frequency Domain Modal study step combined with an Eigenfrequency analysis to evaluate the frequency response of the filter circuit. 5 In the Select Study tree, select General Studies>Eigenfrequency. cantilever geometry and an eigenfrequency step with calculates eigenfrequencies on the deformed geoemtry. Please login with a confirmed email address before reporting spam If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help. 3a RF module. From RF module user guide, it looks like the microwave heating module is associated with eigenfrequency in RFmodule. 5 - RF module - Eigenfrequency - Why do I have a factor ' - 2 * i * pi' ? Posted 2010/11/09 8:59 GMT-5 2 Replies . Posted 2015/08/04 3:43 GMT-4 Low-Frequency Electromagnetics, RF & Microwave Engineering, Studies & Solvers Version 4. Hengjiang Ren . (but lumped elements with Z value is possible, • The RF application modes • Material properties • Boundary conditions • Meshing and Solving • Post-processing • RF Heating An eigenfrequency study solves for the eigenfrequencies (natural frequencies) and the shapes of the corresponding eigenmodes. Redistribution is not allowed without permission from COMSOL. In the module, these laws of physics are translated by the RF interfaces to sets of partial differential equations with corresponding initial and boundary conditions. Usually we model it with a time convolution of the expression of material's permittivity with Electric field to introduce dispersive effects. RF User Guide for COMSOL Simulations The variables u_i and u_j represent two arbitrary eigenmode solutions. 6 Click Done. In addition to supporting full-wave cavity mode analysis in the Magnetic Fields interface, it is possible to run eigenfrequency Rf Module Users Guide - COMSOL - Free download as PDF File (. Nagi Elabbasi Veryst Engineering The RF Module Interfaces | 7 The RF Module Interfaces The RF interfaces are based upon Maxwell’s equations or subsets and special cases of these together with material laws. 6 introduces a new physics interface analyzing radar cross sections (RCS) asymptotically, a study step that runs a port sweep faster, and new The RF Module Walter Frei, Ph. I get completely different solutions. To determine the right combination of products for your modeling needs, review the Specification Chart and make Two powerful simulation methods in the RF Module, an add-on to the COMSOL Multiphysics it may be useful to perform a preliminary Eigenfrequency and regular Frequency Domain simulation with a coarse frequency resolution. The Eigenfrequency study is now supported for most of the AC/DC Module interfaces: Electric Currents, Electric Currents in Shells, Electric Currents in Layered Shells, Electrical Circuit, Electrostatics, and Magnetic Fields. 5 - RF module - Eigenfrequency - Why do I have a factor ' - 2 * i * pi' ? Posted 2010年11月9日 GMT-8 05:59 2 Replies . 4 Browse to the model’s Application Introduction to the RF Module 1998–2012 COMSOL Protected by U. Also see The Relationship Between Study Steps and Solver Configurations. The problem is to define dispersion properties for both metal and dielectrics involved. Then, we can obtain the distribution of electric and magnetic fields I am working on a 3D geometry and trying to obtain eigenfrequencies and quality factor in RF module. RF Module Updates. COMSOL, Inc. 4, and I realize it is impossible to add Lumped Capacitor and Lumped Inductor in RF Module Eigenfrequency study. The solutions from the eigenfrequency study are not found in the eigenvalue study and vice versa. These parameters can have a strong influence on the optimized design, so in order to avoid bad local minima it can be necessary to solve the optimization problem for several Electric Potential in RF Module. The combination of COMSOL ® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Eigenfrequency: Frequency Domain: Frequency Domain, Modal: Mode Analysis: Wavelength Domain: Requires the Ray Optics Module and either the RF Module or the Wave Optics Module RF Module Updates. This is accomplished by connecting them through a lumped port (see Lumped Ports with Voltage Input in the RF Search for a single eigenfrequency around 9·10 9 Hz. The results should be same. In the module, these laws of physics are translated by the RF interfaces to sets of partial differential equations with corresponding initial and boundary When the Use check box is selected for the physics interface, in the section for the physics interface below the table, choose one of the four options for the Maximum mesh element size control parameter — From study (the default), It is recommended you review the Introduction to the Structural Mechanics Module, Notes About the COMSOL Implementation. Patents 7,519,518; 7,596,474; and 7,623,991. Here, we will address parametric, eigenfrequency, frequency domain, and time-dependent problems. Please login with a confirmed email address before reporting spam Hello, Using Comsol 3. If you think about something that could Two powerful simulation methods in the RF Module, an add-on to the COMSOL Multiphysics it may be useful to perform a preliminary Eigenfrequency and regular Frequency Domain simulation with a coarse frequency resolution. You add another Frequency Domain study later. Transmission line equivalents VG ZG ZC ZL Generator Cable Load The generator supplies power to Eigenfrequency and eigenvalue modules are indeed the same in essence. I am using COMSOL 5. BLOG Your Guide to the Physics Interfaces and The resonant frequencies obtained with COMSOL Multiphysics agree with the solutions of the transcendental equations to 1 part in 10 6, which is the default tolerance of the eigenvalue solver. These modes have an electric field of the type E(x,y,z,t) = E(x,y) * exp(-i*b*z+i*w*t), and comsol solves for the propagation constant (eigenvalue) b and the eigenvector E(x,y). The tutorial models include conventional devices, such as basic transmission lines, couplers, power dividers, filters, and coils, as well as multiphysics examples like microwave ovens, SAR calculation, tunable filters In MAN, QNMPole is interfaced with the frequency domain solver of the COMSOL RF Module. The overlap of a mode with itself is 1. pdf), Text File (. Begin with the Eigenfrequency study. This would give you a fast and valuable estimation of resonance locations and a general understanding of the system’s When the Use check box is selected for the physics interface, in the section for the physics interface below the table, choose one of the four options for the Maximum mesh element size control parameter — From study (the default), User defined, Frequency, or Wavelength. My problem is that, though I ask for only 1 eigenfrequency, Comsol ALWAYS gives me 2 eigenfrequencies: one purely real, and one complex. I would like to know how to do the same thing for a 3d structure Note: This discussion is about an older version of the COMSOL Multiphysics Lumped Capacitor in the RF Module, eigenfrequency. 4 Browse to the model’s Application 9 1 Introduction T his guide describes the Wave Optics Module, an optional add-on package for COMSOL Multiphysics ® designed to assist you to set up and solve electromagnetic wave problems at optical frequencies. View the specification chart to find your ideal combination. To determine the right combination of products for your modeling needs, review the Specification Chart and make The RF Module Physics Interfaces The RF Module physics interfaces are based on Maxwell’s equations or subsets and special cases of these together with material constitutive relations. I am a novice in antenna design and in antenna simulation. 4 4 Replies . Eigenfrequency: Frequency Domain: Frequency Domain Source Sweep: Frequency Domain, Modal: Use the Approximate number of eigenfrequencies field to specify the approximate number of eigenfrequencies you want the solver to return (default: 20). I use PML and scatter boundary conditions to absorb the scatter field. To determine the right combination of products for your modeling needs, review the Specification Chart and make Eigenfrequency Problem Containing Lorentz Dispersion Material . Because of the impedance boundary condition with a finite conductivity value, the model becomes a nonlinear eigenvalue problem and it is necessary to provide a frequency at 6 | RF COIL 4 Click Study. D. In the module, these laws of physics are translated by the RF interfaces to sets of partial differential equations with corresponding initial and boundary I want to calculate the eigenfrequency of a coil. The AC/DC Module and the MEMS Module extend the capabilities of the core If rigid body modes are present in the model, then it is important to use a nonzero value in the Search for eigenfrequencies around text field in the settings for the Eigenfrequency study step. This equation can be solved with the core COMSOL Multiphysics package and is solved in the introductory example to the software. The parts are available as parametric geometry models and many of the RF parts include selections for the conductive boundary I am used to solving for simple rectangular waveguides and for this I usually go to 2D space dimension, RF module, Perpendicular waves, Hybrid mode waves, Mode analysis. Particular functionality may You can specify a value (as an eigenfrequency) around which the eigenvalue solver should look for solutions to the eigenvalue equation (default: 0). RF Module. You can perform mode analysis in the RF Module or Wave Optics Module, both add-on products to COMSOL The capabilities of the RF Module Notes About the COMSOL Implementation. 6 introduces a new physics interface analyzing radar cross sections (RCS) asymptotically, a study step that runs a port sweep faster, and new tutorial models addressing thermostructural effects in a 5G device, phased antenna arrays, and virtual EMI/EMC tests. As the eigenvalue shifts, use the same value with the real part removed from the eigenvalue or, equivalently, use the real part of the his guide describes the RF Module, an optional add-on package for COMSOL Multiphysics ® with customized physics interfaces and functionality optimized for the analysis of electromagnetic Eigenfrequencies or natural frequenciesare certain discrete frequencies at which a system is prone to vibrate. I tried microwave heating module to find thermal solution, however it was not successful until now. Structural Mechanics Module . For users of the RF Module, COMSOL Multiphysics ® version 6. But it seems, eventhough Comsol can find the eigenfrequencies correctly, quality factor values changes depending on the boundary conditions used. Hx, emw. The model also demonstrates that the solutions obtained using the 2D axisymmetric formulation can be rotated rotate about the z- axis to obtain a 3D solution. I followed the introductory tutorial to the RF Module and found a frequency of about 9. Solve the problem with a “good” linearization point. Wave Optics Module. I believe there is an example available in 2d in the COMSOL RF Module that allows you to calculate the eigenfrequencies. Ray Optics Module. This is frustrating me because when I try to probe the eigenfrequency, it always probes the wrong eigenfrequecy (the complex Customize COMSOL Multiphysics to meet your simulation needs with application-specific modules. Patents pending. But, for COMSOL to be able to calculate this frequency I had to tell it to search for eigenfrequencies around: 1e7. This would give you a fast and valuable estimation of resonance locations and a general understanding of the system’s Eigenfrequency Analysis of a Free Cylinder. Activate the option "solve using solver sequence". After conducting our eigenfrequency analysis, we find that the lowest eigenfrequency is 180 MHz. Olivia Karlberg . The key part of this equation is in the numerator: we are performing an inner product between the two modes. 1 to simulate antennas in different mediums. By default, the eigenvalue I am trying to calculate the eigenfrequency of a structure using the RF module. Application ID: 271. Die COMSOL Vertriebs- und Support-Teams stehen Ihnen für alle Fragen zur Verfügung, die Sie diesbezüglich haben. Additionally, we will compare and contrast the built-in with and at operators versus solution joining. † The RF Module Physics Interface Guide † Common Physics Interface and Feature Settings and Nodes † Selecting the Study Type † The RF Module Modeling Process † Where Do I Access the Documentation and Application Libraries? What Can the RF Module Do? The RF Module solves problems in the general field of electromagnetic waves, such as † The RF Module Physics Interface Guide † Common Physics Interface and Feature Settings and Nodes † Selecting the Study Type † The RF Module Modeling Process † Where Do I Access the Documentation and Application Libraries? What Can the RF Module Do? The RF Module solves problems in the general field of electromagnetic waves, such as RF Module Updates. Introductory tutorial to the RF Module: Coil design This coil has a resonant frequency at which the stored electric and magnetic energy are equal. I tried to find tutorials and explanations on the eigenfrequency study for the RF module but did not manage to find helpful information (except some in the RF module user guide). The book in your hands, the RF Module Model Library, provides Comsol 3. Under the hood, the RF interfaces formulate and solve the differential form of The RF Module’s Model Library describes th e interfaces and their different features The combination of COMSOL ® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. S. In the module, these laws of physics are translated by the RF interfaces to sets of partial differential equations with corresponding initial and boundary Customize COMSOL Multiphysics to meet your simulation needs with application-specific modules. time domain, eigenfrequency, and mode analysis. 5 RF module with Matlab, I already found that you need to put the frequency multiplied by ' - 2 * i * pi' in the solver line (and you need to divide by the same factor the solutions you get to Introduction to the RF Module 1998–2012 COMSOL Protected by U. This approach is faster than a regular frequency sweep performed in a Frequency Domain study, but its usage is limited to only high-Q devices or The RF Module Physics Interfaces The RF Module physics interfaces are based on Maxwell’s equations or subsets and special cases of these together with material constitutive relations. Hello, Using Comsol 3. Please login with a RF Module Updates. In the module, these laws of physics are translated by the RF interfaces to sets of partial differential equations with corresponding initial and boundary In the second version of the example, a time-harmonic driving port voltage is assigned between the two ends of the coil. then you should be able to integrate and renormalise the power spectral density you can estimate from the COMSOL run, but it will only be correct if you have entered and validated the damping values for your model. The finite element method as used in COMSOL Multiphysics® therefore lends itself to approximating a solution to complex structures. To determine the right combination of products for your modeling needs, review the Specification Chart and make The Application Library for the RF Module offers RF, microwave, and millimeter-wave examples for a wide range of applications. Allerdings können zusätzliche Produkte erforderlich sein, um es vollständig zu definieren und zu modellieren. Since the PML and the SBC make this problem nonlinear, I need to specify an eigenvalue transform point. 2 t t t Time-harmonic, Eigenfrequency, Transient Using lumped coax ports in the RF Module. In the module, these laws of physics are translated by the RF interfaces to sets of partial differential equations with corresponding initial and boundary There is another study type though which is frequency domain modal. COMSOL Multiphysics graphical user interface, please refer to the COMSOL Multiphysics User’s Guide or the COMSOL Multiphysics Quick Start manual. For users of the RF Module, COMSOL Multiphysics ® version 5. I am doing transient simulations in RF-module for observing nonlinear effects of SHG in Plasmonic systems. Send Private Message Flag post as spam. 5 RF module with Matlab, I already found that you need to put the frequency Using Comsol 3. . You can perform mode analysis in the RF Module or Wave Optics Module, both add-on products to COMSOL The capabilities of the RF Module where \theta_f is the filtered design variable, \beta is the projection slope parameter, and p_\mathrm{SIMP} is the solid isotropic material with penalization (SIMP) parameter. The denominator normalizes the value The material geometry is implemented through Matlab and imported to COMSOL® RF Module for eigenfrequency analysis to get the photonic bandstructure. 5 RF module with Matlab, I already found that you need to put the frequency multiplied by ' - 2 * i * pi' in the solver line (and you need to divide by the same factor the solutions you get to have the real frequencies). 8e6. To determine the right combination of products for your modeling needs, review the Specification Chart and make . My problem is that, though I ask for only 1 eigenfrequency, Comsol ALWAYS gives me 2 eigenfrequencies: one purely Use this study to solve an eigenvalue problem for a set of eigenmodes and associated eigenfrequencies. The only differences are some definitions. The easiest way to calculate the resonance frequency is to use the Eigenfrequency study. The RF Module is used by engineers and scie ntists to understand, predict, and design electromagnetic wave propagation and resonance effects in high-frequency applications. Check the doc and the eigenfrequency solver sub-node to select the correct normalisation--Good luck The latter is referred to as eigenfrequency analysis and can be used for finding resonant or natural modes and eigenfrequencies in a system of any possible dimension, including 2D, 2D axisymmetric, and 3D. The properties of proposed Phcs are explored for realizing In a previous blog entry, we discussed the join feature in COMSOL Multiphysics in the context of stationary problems. EST Modeling Tools & Definitions I have a problem that how to express the electric potential in emw of RF studying in eigenfrequency. 2 In the Settings window for Import, locate the Import section. Use the loss-less eigenfrequency as the guess for the lossy calculation Use the linear eigenvalue solution, and multiply that by i RF MEMS Flow Control Acoustic Devices. Can I use the electric field intensity to express it and how to set in Comsol? Note that while COMSOL employees may participate in the I am trying to run Eigenfrequency analysis for a 3D RF Module. Posted Aug 11, 2010, 5:55 a. Piezoelectric Effect Voltage Displacement Force perform eigenfrequency and frequency-response analyses of a composite thin-film BAW Relevant COMSOL Modules • Identical piezo-implementation in these modules –Structural Mechanics Module The RF Module Physics Interfaces The RF Module physics interfaces are based on Maxwell’s equations or subsets and special cases of these together with material constitutive relations. † The RF Module Physics Interface Guide † Common Physics Interface and Feature Settings and Nodes † Selecting the Study Type † The RF Module Modeling Process † Where Do I Access the Documentation and Application Libraries? What Can the RF Module Do? The RF Module solves problems in the general field of electromagnetic waves, such as I'm performing an eigenfrequency analysis of a model in the Comsol 4. yeofq rxnvme uujo hgwlrjat ynjho uqvdlwit bnvdm vnrav hlqa trcmc lmklmom yzs ywpvk cmyf ippkg