SPECIFICATION
Part No.
:
FXR.07.A
Product Name
:
Circular Flexible Near-Field Communications
Antenna
Features
:
13.56 MHz Antenna
Flexible Low Profile Embedded
Dimensions:
•
Diameter: 45.5 mm
•
Thickness: 0.24 mm
Peel and stick 3M adhesive on back
Typical interrogation distance: 40 mm
RoHS Compliant
SPE-14-8-074/E/CM Page 1 of 10
1. Introduction
The FXR.07.A is a circular, flexible, NFC (Near Field Communications) antenna for
use in mobile devices and other applications. The design provides a flexible NFC
antenna that can be adhered to the plastic enclosure of the device for ease of
installation.
With NFC antennas being commonly attached to the battery of mobile devices, they
can be customized with a ferrite flux director to provide isolation from the battery or
other components within the device. Using the antenna on a conductive surface
without a ferrite layer will result in extremely short range or complete failure to
communicate.
Customized antennas for specific applications for shape and for impedance match can
also be provided for an NRE and subject to MOQ. Contact your regional Taoglas sales
office for more information and support on our NFC antenna range.
SPE-14-8-074/E/CM Page 2 of 10
2. Specifications
Flexible PCB Near-Field Communications Antenna
Frequency
Inductance @ 13.56 MHz
13.56
6.4
MHz
µH
Mechanical
Antenna Dimensions
Diameter: 45.5 mm; Thickness: 0.24 mm
RoHS Compliant
Yes
Adhesive
3M 467
Weight
631.6mg
Environmental
Operation Temperature
-40°C to 85°C
Storage Temperature
-40°C to 85°C
Humidity
Non-condensing 65°C 95% RH
Contact pads are gold plated copper. Base material is polyimide which can take heat
from soldering for brief periods suitable for attaching wires. Additional wire length
will affect read range and result in different performance than that detailed in this
document.
SPE-14-8-074/E/CM Page 3 of 10
3.
Antenna Application
3.1. Test setup
A test fixture is used to measure the maximum interrogation distance. The FXR.07.A
antenna is connected to different NFC evaluation boards and then placed on the fixed
part of the fixture.
Evaluation
board
Ruler
Test
fixture
Test
sample
Antenna
The test sample is placed on a thin sheet of plastic connected to the movable part of
the fixture. Then the distance is carefully adjusted until the reader can no longer read
the sample, thus the maximum interrogation distance is displayed in the ruler.
SPE-14-8-074/E/CM Page 4 of 10
3.2. RFID tags used for test
A total of 10 RFID tags were used to measure the interrogation distances. The next
picture shows type 1, type 2 and type 4 tags, respectively.
Type 1 tag is based on ISO/IEC 14443A standard and has 512 bytes of memory.
Type 2 tag is based on ISO/IEC 14443A standard and has 192 bytes of memory.
Type 4 is based on ISO / IEC 14443A 1-4 compliant and has 2K of memory.
The next picture shows the Tag-it HF-I RFID tags from Texas Instruments: RI-102112, RI-I11-112, RI-I03-112, RI-I16-112, Button and RI-I17-112.
The Tag-it HF-I Plus Transponder Inlay family of Texas Instruments RFID is based on
the ISO/IEC 15693 standard for contactless integrated circuit cards (vicinity cards)
and ISO/IEC 18000-3 standard for item management.
SPE-14-8-074/E/CM Page 5 of 10
3.3. Matching
The interrogation distances presented here were taken with the antenna connected
directly to the evaluation boards with the default matching circuit. This is not
necessarily the optimal matching circuit that could be designed for a particular
antenna. We kept the default matching of each evaluation board to minimize the
number of variables in testing and keep integration as simple as possible.
As with any matching network the exact circuit and values for an optimal network
depend on the combination of antenna, NFC circuit, any intervening transmission line
and the environment presented to the antenna. These factors are specific to the
particular end product.
As a starting point, to achieve the read range results presented here, use the
matching network detailed in the schematic of the evaluation board for your particular
NFC chip and keep the antenna free of any obstruction. Once you can demonstrate
successful reads you can then optimize performance as desired.
SPE-14-8-074/E/CM Page 6 of 10
3.4. Test results
A total of 11 sample devices were used to measure the interrogation distances. The
results are in the next tables:
•
Using Texas Instruments TRF7970AEVM:
Dimensions
(mm.)
Interrogation
Distance (mm.)
Mifare Ultralight C
80 x 50
12
Topaz512 (Type 1)
43 x 43
18
NTAG203 (Type 2)
F 42
36
Mifare DESFire (Type 4)
80 x 50
15
Tag-it HFI Plus RI-I11-112
45 x 45
64
Tag-it HFI Plus RI-I02-112
76 x 48
55
Tag-it HFI Plus RI-I03-112
38 x 22.5
41
Tag-it HFI Plus RI-I16-112
F 24.2
36
F 22
34
F 32.5
38
--
34
Dimensions
(mm.)
Interrogation
Distance (mm.)
Mifare Ultralight C
80 x 50
5
Mifare DESFire (Type 4)
80 x 50
14
--
17
Device
Button type
Tag-it HFI Plus RI-I17-112
LG G2 cell phone
•
Using NXP MFEV700:
Device
LG G2 cell phone
SPE-14-8-074/E/CM Page 7 of 10
4.
Mechanical Drawing
SPE-14-8-074/E/CM Page 8 of 10
5.
Packaging
SPE-14-8-074/E/CM Page 9 of 10
Taoglas makes no warranties based on the accuracy or completeness of the contents of this document and reserves the right to
make changes to specifications and product descriptions at any time without notice. Taoglas reserves all rights to this
document and the information contained herein.
Reproduction, use or disclosure to third parties without express permission is strictly prohibited.
Copyright © Taoglas Ltd.
SPE-14-8-074/E/CM Page 10 of 10
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