Other Parts Discussed in Thread: RF430FRL152H
Hello,
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