topic Some Clarification on the NFC Antenna Design Guide PPT in NFC https://community.nxp.com/t5/NFC/Some-Clarification-on-the-NFC-Antenna-Design-Guide-PPT/m-p/497544#M185 <HTML><HEAD></HEAD><BODY><P>Hi All,</P><P></P><P>I'm working on a new project that will be using NFC technology. I found the design guide very helpful, but I'd like to have a few things clarified. The presentation can be found here:</P><P><A href="http://www.themobileknowledge.com/sites/default/files/NFC%20Reader%20Design%20II%20-%20Antenna%20design%20considerations%20-%20Public.pdf" title="http://www.themobileknowledge.com/sites/default/files/NFC%20Reader%20Design%20II%20-%20Antenna%20design%20considerations%20-%20Public.pdf">http://www.themobileknowledge.com/sites/default/files/NFC%20Reader%20Design%20II%20-%20Antenna%20design%20considerations…</A> </P><P></P><P>Can someone explain the coupling coefficient k? The value seems very vague and I'm having trouble understanding what it represents. It makes the charts on pages 14 and 15 a little challenging to interpret.</P><P></P><P>Also, if someone could interpret the two charts on pages 14 and 15, it would be extremely helpful.</P><P></P><P>On page 14, r = x. Does this mean that the read range is approximately equal to the radius of the antenna (assuming a flat circular coil)? Or does this mean the radius of the magnetic field produced by coil?</P><P></P><P>Does the coil need to be flat like in a smart phone? Is it possible to design comparable antennas that are curved or dome-like? As long as the magnetic field is the same?</P><P></P><P>Essentially, I'd like to understand the size limitations in antenna design as I will be trying to implement an antenna into a new design</P><P></P><P>Thanks for your help!</P></BODY></HTML> Wed, 23 Mar 2016 01:10:23 GMT nddpd 2016-03-23T01:10:23Z Some Clarification on the NFC Antenna Design Guide PPT https://community.nxp.com/t5/NFC/Some-Clarification-on-the-NFC-Antenna-Design-Guide-PPT/m-p/497544#M185 <HTML><HEAD></HEAD><BODY><P>Hi All,</P><P></P><P>I'm working on a new project that will be using NFC technology. I found the design guide very helpful, but I'd like to have a few things clarified. The presentation can be found here:</P><P><A href="http://www.themobileknowledge.com/sites/default/files/NFC%20Reader%20Design%20II%20-%20Antenna%20design%20considerations%20-%20Public.pdf" title="http://www.themobileknowledge.com/sites/default/files/NFC%20Reader%20Design%20II%20-%20Antenna%20design%20considerations%20-%20Public.pdf">http://www.themobileknowledge.com/sites/default/files/NFC%20Reader%20Design%20II%20-%20Antenna%20design%20considerations…</A> </P><P></P><P>Can someone explain the coupling coefficient k? The value seems very vague and I'm having trouble understanding what it represents. It makes the charts on pages 14 and 15 a little challenging to interpret.</P><P></P><P>Also, if someone could interpret the two charts on pages 14 and 15, it would be extremely helpful.</P><P></P><P>On page 14, r = x. Does this mean that the read range is approximately equal to the radius of the antenna (assuming a flat circular coil)? Or does this mean the radius of the magnetic field produced by coil?</P><P></P><P>Does the coil need to be flat like in a smart phone? Is it possible to design comparable antennas that are curved or dome-like? As long as the magnetic field is the same?</P><P></P><P>Essentially, I'd like to understand the size limitations in antenna design as I will be trying to implement an antenna into a new design</P><P></P><P>Thanks for your help!</P></BODY></HTML> Wed, 23 Mar 2016 01:10:23 GMT https://community.nxp.com/t5/NFC/Some-Clarification-on-the-NFC-Antenna-Design-Guide-PPT/m-p/497544#M185 nddpd 2016-03-23T01:10:23Z Re: Some Clarification on the NFC Antenna Design Guide PPT https://community.nxp.com/t5/NFC/Some-Clarification-on-the-NFC-Antenna-Design-Guide-PPT/m-p/497545#M186 <HTML><HEAD></HEAD><BODY><P>Hello Donovan Deame,</P><P></P><P>In regards to your antenna questions:</P><P></P><P>The coupling coefficient <STRONG>k</STRONG> is explained in more detail in the NFC antenna webinars, e.g. the number <STRONG>1</STRONG>:</P><P></P><P><SPAN lang="DE" style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;"><A href="http://www.nxp.com/support/online-academy/which-antenna-for-what-purpose-nfc-reader-antenna-design-1:WHICH-ANTENNA-FOR-WHAT-PURPOSE">http://www.nxp.com/support/online-academy/which-antenna-for-what-purpose-nfc-reader-antenna-design-1:WHICH-ANTENNA-FOR-WHAT-PURPOSE</A></SPAN></P><P></P><P>There is a series of antenna design recorded webinar sessions, here:</P><P></P><P><SPAN style="font-size: 11.0pt; font-family: 'Calibri','sans-serif'; color: #1f497d;"><A href="http://www.nxp.com/support/classroom-training-events/webinars-archive:WEBINARS-ARCHIVE?fsrch=1&amp;sr=1&amp;pageNum=1">http://www.nxp.com/support/classroom-training-events/webinars-archive:WEBINARS-ARCHIVE?fsrch=1&amp;sr=1&amp;pageNum=1#</A></SPAN></P><P></P><P>About <STRONG>r = x</STRONG>: yes, the optimum coupling at a certain distance <STRONG>x</STRONG> is given, if the antenna coil radius is equal to the distance.</P><P></P><P>Other antenna form factors are possible, even though not optimum.</P><P></P><P>Regards!</P><P>Jorge Gonzalez</P></BODY></HTML> Tue, 05 Apr 2016 21:55:18 GMT https://community.nxp.com/t5/NFC/Some-Clarification-on-the-NFC-Antenna-Design-Guide-PPT/m-p/497545#M186 Jorge_Gonzalez 2016-04-05T21:55:18Z