XE1218AS000BF Просмотр технического описания (PDF) - Unspecified
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XE1218AS000BF Datasheet PDF : 11 Pages
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Datasheet XE1218A: Low
Power single die FM receiver
6.4 Recommended antenna
All antenna types need to be adapted with regards to the selected operating frequency. In the examples below
the antennas are tuned for an incoming frequency of 160.350MHz (FO + FIF: 160.325MHz + 25kHz). The
antenna can be a printed wire on the PCB, or real estate permitting a wire or a coil.
In the case of a wire antenna, its length should be slightly above 40mm (Figure 1). It can either be printed
straight on the PCB or a loose wire can be used. A magnetic coil antenna however is recommended because
unlike a wire antenna, it is less sensitive to de-tuning by the proximity of the body.
The coil is made of 1.8 turns of a 0.4mm diameter copper wire. The diameter of the antenna is 14mm for a
typical coil inductance of 140nH (Figure 2). The coil is soldered in such a way as to be elevated from the PCB
by at least 10mm, this is to reduce losses due to the ground plane effect of the board.
The value of the capacitors given here may change slightly for different PCBs.
120nH
L > 40mm
22pF
2-10pF
Figure 1
RFI
RFG
D = 14mm
H > 10mm
3.9pF
2-10pF
Figure 2
RFI
RFG
XEMICS 2002
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11
D0204-157
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