topic NFC antenna question in NFC https://community.nxp.com/t5/NFC/NFC-antenna-question/m-p/1069646#M7302 <HTML><HEAD></HEAD><BODY><P>Our customer use PN7150. I test the antenna coil parameters. The Rcoil is 16.3ohm,is it a normal value?&nbsp; Besides, the antenna coil locate on the battery, I see the L value change from 1.33uH(remove battery) to 1.2uH(with battery),what kind of influence lead to for the performance and what should we do?</P></BODY></HTML> Thu, 23 Apr 2020 00:58:41 GMT bob_zhang 2020-04-23T00:58:41Z NFC antenna question https://community.nxp.com/t5/NFC/NFC-antenna-question/m-p/1069646#M7302 <HTML><HEAD></HEAD><BODY><P>Our customer use PN7150. I test the antenna coil parameters. The Rcoil is 16.3ohm,is it a normal value?&nbsp; Besides, the antenna coil locate on the battery, I see the L value change from 1.33uH(remove battery) to 1.2uH(with battery),what kind of influence lead to for the performance and what should we do?</P></BODY></HTML> Thu, 23 Apr 2020 00:58:41 GMT https://community.nxp.com/t5/NFC/NFC-antenna-question/m-p/1069646#M7302 bob_zhang 2020-04-23T00:58:41Z Re: NFC antenna question https://community.nxp.com/t5/NFC/NFC-antenna-question/m-p/1069647#M7303 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P></P><P>The antenna resistance value is not bad, normally a small value translates into more power to the antenna but taking care&nbsp;not to exceed max transmission current, whilst a bigger antenna impedance is recommended for battery-powered devices; please take a look to the&nbsp;<A href="https://www.nxp.com/docs/en/application-note/AN11755.pdf">antenna design app note</A> for more information about this.</P><P>Regarding the antenna onto the battery, it would be helpful to have a material to isolate them,&nbsp;some recommendations are available in the <A href="https://www.nxp.com/design/training/video-vault:VIDEO-VAULT#/collection=videos&amp;start=0&amp;max=25&amp;language=en&amp;keyword=nfc%20antenna%20design&amp;depth=1">antenna design videos</A> for NFC.</P><P></P><P>Hope it helps you to comprehend.</P><P></P><P>BR,</P><P>Ivan.</P></BODY></HTML> Thu, 23 Apr 2020 18:45:18 GMT https://community.nxp.com/t5/NFC/NFC-antenna-question/m-p/1069647#M7303 IvanRuiz 2020-04-23T18:45:18Z