https://community.nxp.com/t5/NFC/MFRC522-antenna-design-problem/m-p/1161809#M7763 <P>I am not any kind of expert. Just want to get design working. I have a problem with an antenna for MFRC522 NFC chip.</P><P>I used a generator for NFC antennas. So my antenna has size 25x25mm and 3 turns.<BR /><BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2020-10-01 at 14.23.21.png" style="width: 876px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/126616i85C02720661FDCBA/image-size/large?v=v2&amp;px=999" role="button" title="Screenshot 2020-10-01 at 14.23.21.png" alt="Screenshot 2020-10-01 at 14.23.21.png" /></span><BR /><BR />Then I used excel sheet and software provided by NXP for calculating antenna matching circuit.<BR /><BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2020-10-01 at 14.24.33.png" style="width: 891px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/126617i9CE91CAF2DD92D18/image-size/large?v=v2&amp;px=999" role="button" title="Screenshot 2020-10-01 at 14.24.33.png" alt="Screenshot 2020-10-01 at 14.24.33.png" /></span></P><P>Schematics:<BR />Values were adjusted to those given by calculator<BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2020-10-01 at 13.34.00.png" style="width: 639px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/126618i2D6DE86625B649E3/image-size/large?v=v2&amp;px=999" role="button" title="Screenshot 2020-10-01 at 13.34.00.png" alt="Screenshot 2020-10-01 at 13.34.00.png" /></span><BR /><BR />My PCB:<BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2020-10-01 at 13.31.46.png" style="width: 364px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/126620iB7FA0348523366DE/image-size/large?v=v2&amp;px=999" role="button" title="Screenshot 2020-10-01 at 13.31.46.png" alt="Screenshot 2020-10-01 at 13.31.46.png" /></span><BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2020-10-01 at 13.32.33.png" style="width: 411px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/126623iFA2EA959EE5ED641/image-size/large?v=v2&amp;px=999" role="button" title="Screenshot 2020-10-01 at 13.32.33.png" alt="Screenshot 2020-10-01 at 13.32.33.png" /></span></P><P>Right now I can’t read and write tag.<BR />Signal from tag sniffed by oscilloscope shows some kind of communication.</P><P>I don’t have vector analyser for characterising antenna.<BR />How to approach this problem?</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Thu, 01 Oct 2020 12:29:55 GMT mariooo 2020-10-01T12:29:55Z https://community.nxp.com/t5/NFC/MFRC522-antenna-design-problem/m-p/1161809#M7763 <P>I am not any kind of expert. Just want to get design working. I have a problem with an antenna for MFRC522 NFC chip.</P><P>I used a generator for NFC antennas. So my antenna has size 25x25mm and 3 turns.<BR /><BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2020-10-01 at 14.23.21.png" style="width: 876px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/126616i85C02720661FDCBA/image-size/large?v=v2&amp;px=999" role="button" title="Screenshot 2020-10-01 at 14.23.21.png" alt="Screenshot 2020-10-01 at 14.23.21.png" /></span><BR /><BR />Then I used excel sheet and software provided by NXP for calculating antenna matching circuit.<BR /><BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2020-10-01 at 14.24.33.png" style="width: 891px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/126617i9CE91CAF2DD92D18/image-size/large?v=v2&amp;px=999" role="button" title="Screenshot 2020-10-01 at 14.24.33.png" alt="Screenshot 2020-10-01 at 14.24.33.png" /></span></P><P>Schematics:<BR />Values were adjusted to those given by calculator<BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2020-10-01 at 13.34.00.png" style="width: 639px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/126618i2D6DE86625B649E3/image-size/large?v=v2&amp;px=999" role="button" title="Screenshot 2020-10-01 at 13.34.00.png" alt="Screenshot 2020-10-01 at 13.34.00.png" /></span><BR /><BR />My PCB:<BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2020-10-01 at 13.31.46.png" style="width: 364px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/126620iB7FA0348523366DE/image-size/large?v=v2&amp;px=999" role="button" title="Screenshot 2020-10-01 at 13.31.46.png" alt="Screenshot 2020-10-01 at 13.31.46.png" /></span><BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2020-10-01 at 13.32.33.png" style="width: 411px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/126623iFA2EA959EE5ED641/image-size/large?v=v2&amp;px=999" role="button" title="Screenshot 2020-10-01 at 13.32.33.png" alt="Screenshot 2020-10-01 at 13.32.33.png" /></span></P><P>Right now I can’t read and write tag.<BR />Signal from tag sniffed by oscilloscope shows some kind of communication.</P><P>I don’t have vector analyser for characterising antenna.<BR />How to approach this problem?</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Thu, 01 Oct 2020 12:29:55 GMT https://community.nxp.com/t5/NFC/MFRC522-antenna-design-problem/m-p/1161809#M7763 mariooo 2020-10-01T12:29:55Z https://community.nxp.com/t5/NFC/MFRC522-antenna-design-problem/m-p/1164192#M7781 <P>Hello,</P> <P>&nbsp;</P> <P>As the device is not recommend for new design we only have available the information and the <A href="https://www.nxp.com/docs/en/application-note/149110.zip%20" target="_self">excel calculation&nbsp;</A>, still for antenna design we recommend the use of some special equipment , you can check more details in the antenna design webinars we have available in the following <A href="https://www.nxp.com/design/training:TRAINING-EVENTS#/collection=trainings&amp;start=0&amp;max=10&amp;parameters=TrainingType.Topics.deviceTax.applicationTax.country.TrainingLanguage.TrainingFormat&amp;query=training_date%3E%3E2020-10-07..*::deviceTax%3E%3Ec817_c798_c1491&amp;sorting=ModifiedDate.desc&amp;language=en&amp;keyword=antenna%20design%20&amp;siblings=false" target="_self">page</A> .</P> <P>&nbsp;</P> <P>Hope this helps.</P> <P>&nbsp;</P> <P>regards,</P> <P>Estephania</P> Wed, 07 Oct 2020 22:39:33 GMT https://community.nxp.com/t5/NFC/MFRC522-antenna-design-problem/m-p/1164192#M7781 stephanie_m 2020-10-07T22:39:33Z