High Q transponder coils for tyre-pressure applications

November 07, 2013 // By Graham Prophet
PREMO, manufacturer of LF RFID antennas, has expands its TP0702CAP family of transponder coils with an improved version with higher Q and sensitivity specially designed for tyre pressure monitoring systems (TPMS) applications.

The TP0702UCAP series is offered in five standard values, 2.38 mH, 4.91 mH, 7.2 mH, 9 mH and 18.52 mH at a working frequency of 125 kHz and can be customised upon request with values from 0.34 mH-18 mH. These antennas offers up to 90 mV/A/m sensitivity which give the best sensitivity in this transponder size (8.50 x 2.90 x 2.70 mm).

NiZn ferrite cores offer high surface resistivity (> 10 MOhm/mm) and enable highly stable behaviour (better than ±3%) over a wide temperature range (-40C to 125C). This rugged antenna provides an upper and lateral side protection with co-polyamide polyhexamethylene polymer walls, gamma radiated with high thermal stability and mechanical resistance (exceeds 150 Mpa mechanical strength. Its surface mount (SMT) allows an easy use in automated process. This antenna is also suitable for passive keyless entry (PKE) systems and immobilisers.

Code

L (mH)

Tolerance

Q Min

Frequency (kHz)

Cres (pF)

SRF (kHz) Min

DCR (Ω) Max

Sensitivity (mVpp/App/m) Min

Length (mm)

Width (mm)

Height (mm)

TP0702UCAP-0238J

2.38

± 5%

30

125

680

900

25.3

25

8.6

3

2.7

TP0702UCAP-0491J

4.91

± 5%

35

125

330

700

38.5

38

8.6

3

2.7

TP0702UCAP-0720J

7.2

± 5%

30

125

220

500

61.1

50

8.6

3

2.7

TP0702UCAP-0900J

9.0

± 5%

30

125

180

450

84.7

55

8.6

3

2.7

TP0702UCAP-1850J

18.5

± 5%

30

125

87

400

165

90

8.6

3

2.7

Premo Group; http://www.grupopremo.com/es/file/940