TOKEN
TR4308I Chip RFID Transponder Coils
RFID
Transponder Coils
Transponder Coils (TR4308I) is The Key of
Radio Frequency Identification (RFID) System
Preview
Token TR4308I transponder coil series is specified for RFID applications for the best performing designed at
125 kHz. The TR4308I covers a wide range of electrical performances and offers better sensitivity, greater read
distance and higher SRF than other coils its size.
The TR4308I’s length and cross section area are optimized for best sensitivity in the coil axis. The coil is wound
on a plastic base, providing great durability and allowing this part to withstand harsh mechanical shock. With
operating temperature range to 125°C, these coils are ideal for a wide range of applications.
Radio Frequency Identification (RFID) is the system of using radio signals to send information identifying a
particular situation or item. Token TR4308I is suited for wireless data transmission in low frequency RFID
products, such as immobilizers, TPMS, keyless entry. Other industrial applications include access control and
tracking devices.
In addition to our standard models, Token can design transponder coils to operate at other frequencies.
Customized inductance values are available on request.
Features :
- High Q value.
- Low profile with an extended length.
Applications :
- Car remote control key.
Version 2010
http://www.token.com.tw/
rfq token.com.tw
01 of 04
TOKEN
B
TR4308I Chip RFID Transponder Coils
Configurations & Dimensions
C
F
G
TC-XXX
Top View
E
B
3.15
D
C
2.74
D
1.01
E
0.51
A
11.43
F
2.79
Inductance
(mH)
0.40
0.90
1.08
1.97
2.38
3.30
4.15
4.90
6.80
7.10
8.10
Q (min)
15
15
15
17
17
17
17
17
17
17
17
Test Freq.
(KHz)
125
125
125
125
125
125
125
125
125
125
125
SRF (KHz)(min)
4500
4000
4000
2400
2200
1800
1700
1300
1000
1000
960
http://www.token.com.tw/
rfq token.com.tw
A
H
Land Pattern
G
1.78
H
8.46
Type
TC4308I
Note:
Design as Customer’s Requested Specifications.
Electrical Characteristics
Part Number
TC4308I - 401J
TC4308I - 901J
TC4308I - 112J
TC4308I - 202J
TC4308I - 242J
TC4308I - 332J
TC4308I - 412J
TC4308I - 492J
TC4308I - 682J
TC4308I - 712J
TC4308I - 812J
DCR (Ω)(max)
7.4
22
25
34
39
51
74
96
112
115
123
Note: Test Freq.: 125KHz / 0.25V.
Operating Temp.: -40°C+85°C.
02 of 04
Version 2010
TOKEN
TR4308I Chip RFID Transponder Coils
Transponder Coils Applications
Transponder Coils in an RFID Radio Frequency Identification System
RFID, Radio Frequency Identification, is the system of using radio signals to send information identifying a
particular item. The most common application of RFID is to track and locate any subject including material, or
moving item.
The RFID transponder coil is part of the coupling device and acts as the transmitting antenna. The main
specifications of the transponder coil are sensitivity and read distance, however, the inductance of the transponder
coil directly influences the sensitivity and the read distance. Generally, a higher inductance provides greater
sensitivity resulting in a longer read distance.
There are two major components in an RFID system:
●
Tag:
The transponder programmed with unique information. The tag consists of an integrated circuit
and a coupling device. The integrated circuit stores specific data unique to that tag.
●
Reader:
The interrogator includes a decoder to interpret data. The coupling device interfaces with the
reader.
The manufacturer of the tag usually specifies the inductance of the coil to be used. The read distance is defined
as the maximum distance from the reader that the transponder responds to the reader’s magnetic field. The reader
produces a magnetic field that triggers the tag. When the reader receives the transmitted data, it interprets the data
and takes appropriate action as shown in figure 1.
When the transponder enters the field produced by the reader, the coil produces a voltage inside the tag. In an
active transponder, the voltage is used to wake the tag and use its internal battery. In a passive transponder,
this voltage can be used to power the tag. Active transponders generally have longer read distances, shorter
operational life and are larger and more costly to manufacture. Passive transponders are generally smaller, have a
longer life and are less expensive to manufacture.
For optimum performance, the transponder coil is used in a parallel LC circuit as shown in figure 2. Adding
a capacitor to the circuit maximizes the read distance. The LC circuit is designed to resonate at the operating
frequency of the reader. To calculate the value of the capacitor, use the following
equation: Capacitance (C) = 1 / (Inductance L x (2π x Frequency ƒ))
2
Magmetic field produced
by the reader
Tag
Reader
Data transmitted
by the tag
Figure 2. LC Circuit
Figure 1. RFID System
Version 2010
http://www.token.com.tw/
rfq token.com.tw
03 of 04
京公网安备 11010802033920号
EEWORLD
