APGRD001 Microchip Technology, APGRD001 Datasheet - Page 6
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APGRD001
Manufacturer Part Number
APGRD001
Description
REF DESIGN PKE PIC16F639
Manufacturer
Microchip Technology
Type
PKE, RKEr
Specifications of APGRD001
Frequency
125kHz
Processor To Be Evaluated
PIC16F639
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
PIC16F639, PIC16F636, PIC18F2680
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
AN1024
FIGURE 5:
The antenna orientation problem can be significantly
reduced if the three antennas are placed orthogonally
on the same PCB board. This increases the probability
that at least one of the transponder antennas faces
toward the base station antenna at a given incident
during application. Figure 6 shows a graphical
illustration
transponder board. A large air-core coil is used for LCZ
and two ferrite-core coils are used for LCX and LCY.
There are companies that make the ferrite coils
specifically for the 125 kHz RFID and low-frequency
sensing applications.
DS01024B-page 6
Effective Antenna Surface Area = S cos a
a
of
Magnetic field from the base station
placing
ANTENNA ORIENTATION
DEPENDENCY
Transponder’s LF antenna
with surface area S
three
Line of axis
antennas
on
the
FIGURE 6:
Note 1: Keep the size of the air-core antenna (LCZ)
2: Keep the separation between the antennas
as large as possible, given the PCB space
available.
as far apart as possible to reduce a mutual
coupling between them.
Ferrite-core Antenna
Air-core Antenna
(LCX Input Pin)
(LCZ antenna)
Transponder PCB
Ferrite-core Antenna
RECOMMENDED ANTENNA
PLACEMENT ON
TRANSPONDER BOARD
(LCY Input Pin)
© 2007 Microchip Technology Inc.