Linear Technology DC2181A Series Demo Manual page 7

theory of operation
AE1, the Receive Antenna
One of the main differences between the DC1967A and the
DC2181 demo boards, is that the wireless power receive
antenna is separate for the DC2181 demo board.
Several antennas were tested, with the criteria of pass-
ing 2.5W at 8mm spacing. The following table lists the
antennas that passed successfully:
MANUFACTURER CONSTRUCTION
TDK Ferrite on PCB
Inter-Technical Ferrite on PCB
Inter-Technical Ferrite on PCB
Inter-Technical Litz on Ferrite
Inter-Technical Litz on Ferrite
Inter-Technical Ferrite on PCB
TDK Wire on Ferrite
Würth Wire on Ferrite
*AE1 wireless power receive antenna shipped with DC2181
½ Power
Envelope
MFG PART NUMBER
B67410-A0223-X195
L41200R01
L41200R02*
L41200R03
L41200R04
L41200R05
WR282830-37M8-LR4
760308101303
Full Power
±1mm
17mm
18mm
1mm Minimum Clearance
Transmit Antenna
Figure 10. Power Transfer vs Axial Distance and Misalignment
DEMO MANUAL
The manufacturers can be contacted at:
Inter-Technical www.inter-technical.com, search for LTC4120
TDK www.tdk.components.com
Würth http://katalog.we-online.de/pbs/
datasheet/760308101303.pdf
AE1 is physically mounted with double sided tape, as well
as the electrical connection pins. Removing AE1 is likely
to damage the ferrite on the backside of the antenna. Only
remove AE1 when you have the a suitable replacement
at hand.
½ Power
±1mm
Full Power
Envelope
9mm
8mm
7mm
6mm
5mm
13mm
4mm
3mm
2mm
15mm
DC2181A-A/B
DC1967A-B with
25mm Receive
Antenna
DC2181A F10
dc2181afa
7