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Part Number: RF430FRL152HEVM
We measured the communication distance of RF430FRL152H EVM with below conditions.
1) Antenna : Default on board antenna N:6, w: 37mm, h: 19mm
2) Power supply: - Powered by RF - Powered by Usb
3) ISO15693 Reader - TR3-LD003GW4LM-L (4W output) - TR3-LA101W4 (420 x 297 mm)
4) maximum communication distance - Powered by RF : 330mm - Powered by Usb : 350mm
The difference between the two was smaller than I expected.I hoped the maximum distance of usb tag is up to 50cm or more, but only 2cm difference.According to the RF signals monitored by oscilloscope, the tag doesn't send a response to the reader at outside the maximum distance.It seems the tag cannot receive(demodulate) the reader signal in spite of sufficient power by usb.
[Question]Is it possible to lengthen the distance without changing the antenna size?I know that if we use bigger and more coiled antenna we can do it.For example, in case of ISO15693 card (ID-1 sized antenna) the maximum distance becomes up to 70cm.I'd like to know whether or not it is possible to lengthen theoretically even though using a small antenna.
Best regards,Takashi Suzuki
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In reply to Ralph Jacobi:
Thanks a lot for your quick reply.Let me ask one more question just for the clarification.
Communication error is caused by two reason generally.1) Tag cannot receive a command from reader.2) Reader cannot recive a response from tag.
This time No.1 is the case and,With the reference small antenna, the tag cannot demodulate the reader signal and no way to solve it other than increasing the antenna size, am I right?We are using the maximum power reader under the Japanese radio law so it is impossible to increase the reader power.Thanks in advance.
In reply to user5364999:
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