Robert Koslover
Certified Consultant
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Posted:
6 years ago
2018年5月2日 GMT-4 13:20
Updated:
6 years ago
2018年5月2日 GMT-4 13:22
You need to make your mesh fine enough to be able to represent: (1) the waves in detail in places where they matter, and (2) the geometry in detail in places where it matters. You can control the mesh by changing to a user-controlled mesh. Don't just let Comsol determine the mesh densities for you. The Comsol software isn't really very good at guessing what you actually need for most RF and antenna problems. Instead, use your own brain/knowledge about the patch antenna to recognize where you need a fine mesh and where you don't. Look up how to set mesh values manually in the Help system. There is a lot you can do. Hint: mesh the patch itself and the dielectric directly under it relatively finely (e.g., lambda/20 or finer), but you can mesh other parts of the computational volume much more coarsely (e.g., lambda/6) without difficulties. You can also set the discetization of the elements. Comsol will default to quadratic, but you can save memory if necessary by using linear. You can also choose your solvers differently (iterative ones are less stable and often slower, but use less RAM, while the direct ones are faster, but use more RAM).
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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
You need to make your mesh fine enough to be able to represent: (1) the waves in detail in places where they matter, and (2) the geometry in detail in places where it matters. You can control the mesh by changing to a user-controlled mesh. Don't just let Comsol determine the mesh densities for you. The Comsol software isn't really very good at guessing what you actually need for most RF and antenna problems. Instead, use your own brain/knowledge about the patch antenna to recognize where you need a fine mesh and where you don't. Look up how to set mesh values manually in the Help system. There is a lot you can do. Hint: mesh the patch itself and the dielectric directly under it relatively finely (e.g., lambda/20 or finer), but you can mesh other parts of the computational volume much more coarsely (e.g., lambda/6) without difficulties. You can also set the discetization of the elements. Comsol will default to quadratic, but you can save memory if necessary by using linear. You can also choose your solvers differently (iterative ones are less stable and often slower, but use less RAM, while the direct ones are faster, but use more RAM).