Datasheet

APPLICATION SPECIFICATION
REVISION:
ECR/ECN INFORMATION:
TITLE:
Rectangular Standard NFC Antenna
Application Specification
SHEET No.
B1
EC No:
626150
9 of 21
DATE:
2019/10/23
DOCUMENT NUMBER:
CREATED / REVISED BY:
CHECKED BY:
APPROVED BY:
AS-1462360001
Liu Hai 2019/10/17
Cheng Kang 2019/10/17
Stary Song 2019/10/17
TEMPLATE FILENAME: APPLICATION_SPEC[SIZE_A](V.1).DOC
1462360001
1462360011
1462360021
1462360031
1462360051
Capacitor
Values
68pF
68pF
56pF
56pF
100pF
1462360101
1462360111
1462360121
1462360131
1462360151
Capacitor
Values
51pF
51pF
39pF
47pF
68pF
1462362102
1462362111
1462362122
1462362131
1462362151
Capacitor
Values
51pF
51pF
39pF
47pF
68pF
FIGURE 5.2 CAPACITOR VALUES FOR NFC ANTENNA MATCHING NETWORK
6.0 DETECTION DISTANCE TEST
6.1 TEST SYSTEM FOR NFC ANTENNA IN FREE SPACE
To compare the NFC antenna performance, we design a test system to simulate the usage of the
NFC antenna and measure the maximum detection distance. One thing should be mentioned
here, this test system is different from the NFC forum protocol test system and it is just used for
NFC antennas performance comparison.
The below picture shows the test system set up. The NFC antenna is connected to the evaluation
board, which is controlled by the computer. In order to get good detection distance, the NFC
antennas have been well matched on the evaluation board. The standard RFID tags are placed on
plastic part of the fixture, which can be movable. With the help of the ruler, we can get the
maximum detection distance between RFID tags and NFC antennas when the distance is tune and
the reader cannot read the RFID tag.
FIGURE 6.1.1 TEST SYSTEM FOR NFC ANTENNA IN FREE SPACE