Magnetic field due to the applied RF to a metal plate
Posted 11.12.2024, 16:58 GMT-5 8 Replies
Please login with a confirmed email address before reporting spam
Hello! I have a metal plate to which I apply an RF field (2pi100 MHz frequency at 1 kV). If I don't apply this perfectly at the center of the plate (which will be the case in practice), I will induce some current in the plate, which in turn will produce a magnetic field around the plate. I would like to quantify the magnetic field as a function of the place where I apply the RF field to the plate. For completeness, this is simply a capacitor setup for which I want to apply this high voltage, high frequency RF field and I would like to know the induced magnetic field in between the 2 plates (on top of the usual one, due to the time varying magnetic field). How should I proceed with doing this? Are there any instruction videos about it I can build on? Thank you!
Please login with a confirmed email address before reporting spam
I'm confused by your question and I think everyone else is too, since no one has replied to you yet. When you say that you want to "apply an RF field" to the plate, how do you intend to "apply" it? You refer to "the place" that you apply the field. So, are you saying that you don't intend to "apply" this RF field to the whole plate? How do you intend to limit where you do or do not "apply" this field? You are calling this a capacitor, with two plates, so I am guessing that, maybe, you actually intend to apply this "RF field" as a current, perhaps using wires? OK, let's assume that. But you also say " If I don't apply this perfectly at the center of the plate (which will be the case in practice), I will induce some current in the plate, which in turn will produce a magnetic field around the plate." Please explain why you think applying an RF current (if that's what you meant) at the center of one of the capacitor plates would/should not "induce some current in the plate." After all, if any current whatsoever flows from your wire (if you have a wire) to the plate, then surely there will be currents on that plate, regardless of whether the geometry is symmetric or not, and a magnetic field will also be generated. I really don't know how you could apply an RF current to a capacitor and not generate some magnetic fields, regardless of where/how you connected to the capacitor. I suggest you draw detailed pictures and label where you wish to apply currents (or is it some other way of applying RF?) and post that here.
-------------------Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Please login with a confirmed email address before reporting spam
I apologize for the confusion (this is my first post here) and please allow me to clarify. My setup is 2 metallic parallel plates (let's assume they are disk shaped, but the actual shape is not that relevant for my question and I am actually planning on trying different geometries), separated by 1 mm. I want to produce at the center of the plates (the actual volume I am interested in is roughly a sphere of radius 10 microns at the center in between the 2 plates) a sinusoidal electric field, of frequency ~50 MHz and amplitude ~ 100 V/cm. So these plates will be part of a resonant circuit and will act as a capacitor. If the plates are perfectly parallel to each other and the (ideal) electrical connections to the plates are made at the center of the plates, the magnetic field at very the center in between the 2 plates, in a direction perpendicular to the plates (which is the direction I am interested in) will be zero. In practice I will have magnetic fields from 2 main contributions:
- If the plates are note perfectly parallel to each other (i.e. the time varying electric field will have a component parallel to the plates and it will thus induce a time varying magnetic field perpendicular to the plates).
- Even if the plates are perfectly parallel, if the electrical connections are not made at the center of each of the 2 plates, the current induced in the plates won't be symmetric with respect to the point at the center in between the 2 plates and thus I will have a magnetic field induced there. If on top of this the 2 plates are also not perfectly parallel, this magnetic field due to induced currents will be along the direction perpendicular to the 2 plates (and it will be in addition to the magnetic field in 1.).
I want to compute the magnitude of the magnetic field due to 2. at the center in between the 2 plates, for different tilt angles between the 2 plates and for different electrical connections applied to the plates. I am also attaching a simplified drawing of the setup.
Please let me know if this is still not clear, I would be happy to provide more details. Thank you!
Attachments:
Please login with a confirmed email address before reporting spam
The attached quick example should be more than sufficient to get you started. Note that you'll need the AC/DC module and at least version 6.2 of Comsol Multiphysics. Enjoy.
-------------------Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Attachments:
Please login with a confirmed email address before reporting spam
Thank you so much! I will give this a try.
Please login with a confirmed email address before reporting spam
Is there a way to open this in 6.1? This is the version my university has.
Please login with a confirmed email address before reporting spam
Sorry. I did it in v6.2 because I thought you might not have v6.3 yet. Maybe you can find someone with a copy of v6.2 or v6.3?
Added note: Multiphysics v6.3 was released just last month, but v6.2 was released more than a year ago. See https://www.comsol.com/release-history
-------------------Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Please login with a confirmed email address before reporting spam
Would it be possible to export it as a java file? It seems like there is a way to open it in 6.1 using a java file.
Please login with a confirmed email address before reporting spam
OK. I haven't tried importing java files into Comsol Multiphysics, so I don't know how well that will work, but I've attached one that I exported as a java file. Good luck.
-------------------Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
Attachments:
Reply
Please read the discussion forum rules before posting.
Discussion Forum Rules and Guidelines
The goal of COMSOL Access is to provide a forum for you to communicate effectively with COMSOL as well as your colleagues within the multiphysics simulation community. This involves providing you with access to technical support and downloads of the latest {:comsol} software releases, as well as the ability to share your comments and work with other users of the {:comsol} software through forums such as the blog, discussion forum, and Application Exchange. In order to make this an efficient and pleasant experience for you and other members of COMSOL Access, we ask that you follow a few rules and guidelines.
When registering for COMSOL Access, you agree to provide your complete and truthful information for all fields requested on your COMSOL Access account registration page. You also agree to maintain the accuracy of all information associated with you on your COMSOL Access account. You agree to maintain your COMSOL Access account for use solely by you, not to share your username and password with anyone else, and to take appropriate precautions to restrict access to your username and password from others. Furthermore, you agree not to submit any information relating to your employer through your COMSOL Access account without your employer’s authorization. Should you use a COMSOL Access account associated with an employer, you agree to immediately discontinue using that account upon termination of that employment.
The moderators of the forums will remove any generally objectionable material as quickly as possible. You acknowledge that all posts made to these forums express the views and opinions of the author and not the administrators, moderators, or webmaster (except for posts by these people). Hence, they will not be held liable.
You agree not to post or link to any material that is abusive, obscene, vulgar, slanderous, hateful, threatening, sexually oriented, or that infringes upon or violates any third-party rights or any other material that may violate any applicable laws. You agree that you will not otherwise use your COMSOL Access account to violate or to assist anyone in violating any law. Engaging in any activity in violation of these COMSOL Access rules and guidelines may lead to you being immediately and permanently banned from COMSOL Access. The IP address of all posts is recorded to aid in enforcing these conditions. You agree that the webmaster, administrator, and moderators of the forums have the right to remove, move, or close any topic at any time as they see fit. As a user of COMSOL Access, you agree to any information you have entered into any of the forums being stored in a database.
You agree that you will not use your COMSOL Access account in violation of any applicable export control laws. You represent and warrant that you are not subject to any comprehensive sanction or embargo by the U.S. or any other country, nor are you identified on any list maintained by the U.S. government that identifies persons for which the U.S. maintains restrictions. Further, you represent and warrant that you are not subject to any restriction on the receipt of technology or products under the export control laws of the U.S. or any other country.
Basic Rules
- Flaming: Do not post any messages that harass, insult, belittle, threaten, or flame another member or guest. Debates are fine, but argue with the point, not the person.
- Trolling: Do not post with the purpose of starting a dispute. Note that a person disagreeing with your opinion is not considered trolling; keep it civil, even if you are sure that the other person is wrong. Anything seen as trolling will result in you being banned.
- Spamming: Posts without content or containing nonsense waste space and everyone's time. Spam will be removed from the forum.
- Offensive Posts, Links or Images: Do not use profanity, racial, ethnic, religious, or other slurs or any other offensive material.
- Advertising: Posting of advertisements for products or services, links to auctions, affiliate links, links to promote websites, and so forth is not allowed.
- Disclosure of Personal Information: Do not disclose any other member's email, real name, address, phone number, IP address, or other personal information. This includes posting contents of emails and private messages without the sender's consent. Do not bring personal disputes into the forums. Bans and warnings issued to other users are considered personal information.
- Misleading Titles: The subject line of the post should be as informative as possible about the content of the post. This also reduces the amount of duplicate posts.
- Thread Hijacking: Taking a thread off-topic to pursue one's own agenda is not permitted.
- Piracy: Do not upload, post, email, transmit, or otherwise make available any content that infringes upon any patent, trademark, trade secret, copyright, or other proprietary rights ("Rights") of any party. This includes COMSOL model files created by a forged or illegitimate license.
- Honesty: Users must provide truthful information in creating their COMSOL Access account.
These rules are subject to change. The moderators reserve the right to remove, edit, or move posts at their discretion. The COMSOL Access administrators will reserve the right to permanently remove a user account without notice if any of the rules are not followed. Particular services accessible with your COMSOL Access account may be subject to additional rules. You agree to comply with all rules applicable to each service you access through your COMSOL Access account.
Posting Guidelines
When posting, understand that you are trying to communicate with other people. Although many COMSOL Access members are not fluent in English, the official language of this forum is English.
Here are some important guidelines of language:
- Write in English.
- If you are familiar with LaTeX, please use this to write mathematical equations.
- Always do a quick check for spelling/grammar mistakes.
- Format your post in a legible manner. Use the Preview button often.
- Be concise and articulate as much as possible.
- Use the Enter key to create paragraphs.
- Capitalize correctly. It is difficult to read posts that are written entirely in uppercase or lowercase.
- Use correct punctuation. Avoid run-on sentences.
- Try to avoid using “text speak”, “net speak”, or slang. The purpose of language is to be understood.
- Never invent acronyms and use as few acronyms as possible. For example, write "COMSOL Multiphysics" and not "CMP".
- Review your post before publishing it. Try to catch typos.
- Please check to see if a topic has already been posted. Do not post multiple threads on the same topic.
Disclaimer
By submitting content to the forums, you hereby grant COMSOL a nonexclusive, royalty-free, perpetual, worldwide, and unrestricted license to reproduce, publicly display, publicly distribute, and prepare derivative works of the content. COMSOL hereby grants you a license to copy and/or use content from the forums solely for your own internal purposes. COMSOL provides the forum service for the benefit of our users to share content with the community. All content is provided "as is" without warranty of any kind, express or implied, including without limitation, warranties of merchantability, noninfringement, design, operation, and fitness for a particular purpose, and the entire risk as to the quality and performance of the programs is with you.
Neither COMSOL, the authors, nor the copyright owners of submitted materials warrant that the programs will be error-free, uninterrupted, virus-free, secure, and suitable for your needs, produce specific results, or that errors or failures will be corrected. Comments on supplied content should be sent to the author or copyright owner through the tools provided in the forums.
Please log in to post a reply.
Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.
Suggested Content
- KNOWLEDGE BASE The Magnetic and Electric Fields Interface with Electrical Circuit Gives an Unexpected Error for Transient Studies
- KNOWLEDGE BASE Using Symmetries in COMSOL Multiphysics
- FORUM Parallel plate capacitor with applied pressure
- BLOG Calculate the Force of a One-Sided Magnet
- KNOWLEDGE BASE The Usage of Form Union and Form Assembly