Agrident ABR200 ABR200 OEM RFID Reader Module (134.2kHz) User Manual

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Agrident GmbH, Steinklippenstr. 10, D-30890 Barsinghausen
Phone +49 5105 582573-10 - Fax +49 5105 582573-17
ABR200
Antenna Tuning Manual
Firmware 1.00 and higher
V18/12/13
ABR200 Antenna Tuning Manual
© Copyright 2013 by Agrident GmbH
TB
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system,
or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or
otherwise, without prior written permission of Agrident GmbH.
Agrident GmbH reserves the right to make changes to any and all parts of this documentation
without obligation to notify any person or entity of such changes.
December 2013
Agrident GmbH
Steinklippenstr. 10
30890 Barsinghausen
Germany
Phone +49 (0) 51 05 582573-10
Fax +49 (0) 51 05 582573-17
E-Mail: mail@agrident.com
www.agrident.com
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ABR200 Antenna Tuning Manual
Content
Introduction.......................................................................................................... 4
Tuning the antenna using ASR-PC-Demo ........................................................... 5
Antenna Tuning using an Oscilloscope ............................................................... 6
Capacitor selection .............................................................................................. 8
Trouble shooting .................................................................................................. 8
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ABR200 Antenna Tuning Manual
Introduction
If an antenna is connected to the ABR200 reader module, the antenna has to be adapted to the
ABR200 reader module in order to get the optimum reading range. The inductance of the
antenna builds a series resonant circuit together with the resonant circuit capacitors on the
reader.
The antenna tuning could be done by using an oscilloscope or the PC-Software ASR-PC-Demo.
Alternatively the antenna voltage can be requested using the corresponding command by any
other software or host processor.
For ferrite antennas, which are not already casted, the antenna tuning is pretty easy. If the coil
is moved on the ferrite the antenna inductance is changing. The tuning is perfect if the
maximum antenna voltage is reached.
In order to have the optimum reading performance, the resonant circuit needs to be tuned to the
correct resonant frequency, in this case 134.2 KHz. The resonant frequency depends on the
antenna inductance and the capacitance on the reader board.
f 
2 LC
f…resonant frequency, here 134.2 KHz
L…Inductance (here in µH)
C…Capacitance (here in nF)
The ABR200 has a basic capacitor with a value of 4.7nF on-board. During the in-circuit-test in
production a maximum of 2 more capacitors is added to the reader board in order to match the
on-board capacitance to an inductance of exactly 275µH. That means, if your antenna always
has an inductance of 275µH (plus/minus 1 percent), you should not need to do further tuning.
That would also apply if you want to connect Agrident external stick antennas to the ABR200
because these are already factory tuned to 275µH.
For air-coils and casted antennas the antenna inductance is fixed and cannot be changed
anymore. The only way to tune to the correct resonant frequency is to adapt the capacitance to
the antenna inductance. This has to be done on the customer’s PCB.
Please note that, if you cannot meet an exact target inductance of 275µH,
your antenna inductance must me SMALLER than this value. Then it is
still possible to tune to resonance by adding capacitance. Removing
capacitance is not possible because this is fixed on the ABR200.
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ABR200 Antenna Tuning Manual
The following picture shows how additional capacitors have to be connected to the ABR200:
In this example there are 3 additional capacitors, which can be set with jumpers. On a
customer’s PCB one capacitor (or maybe 2) with the correct value would be enough BUT the
correct value is not the same for every unit. The antenna tuning has to be done for every reader
individually! Change the capacitance until you have reached the maximum antenna voltage.
Tuning the antenna using ASR-PC-Demo
Start ASR-PC-Demo and connect the ABR200 to the software. Go to the “Tuning” tab.
The antenna voltage can be requested from the
ABR200 by pressing the “get” button. The
voltage depends on the antenna Q (inductance
and resistance). In this example the antenna Q
is pretty high (>>100) and thus the antenna
voltage is also fairly high (but absolutely ok).
In order to request the antenna voltage
repeatedly you can check the box “poll”. The
PC-Software will request the readers antenna
voltage until the box is unchecked again. This
can be useful while moving the coil on a ferrite
rod in order to tune to the correct inductance.
In this example the voltage of the antenna is 305V. This value could differ from the antenna
voltage measured with an oscilloscope. Change the coil position on the antenna rod until the
maximum voltage is reached. Try to find the maximum very carefully since small changes of the
coil position result in big changes of the antenna voltage.
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ABR200 Antenna Tuning Manual
Antenna Tuning using an Oscilloscope
It is also possible to tune the antenna to the correct inductance and thus to the maximum
voltage using an Oscilloscope.
Connect the oscilloscope to Pin2 of the right connection terminal – that is the high voltage side
of the resonant circuit.
The oscilloscope settings for the following examples are:
Channel 1:
Time:
Trigger:
Measurement:
50Volts/Div
2µs/Div
Auto
Peak-Peak and Frequency
Example for a correctly tuned antenna:
There are two references for indicating that the antenna tuning is okay:
1. Maximum possible voltage
2. The small peak on the sine wave is exactly at the top and the bottom of the curve.
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ABR200 Antenna Tuning Manual
Example for an antenna, where the inductance is too low:
In that example the antenna inductance is too low and the coil is too much at the top of the
ferrite (voltage too low and peak more to the right). Move the coil more to the middle of the
ferrite. In case of air-coils or casted ferrite antennas, add capacitance.
decrease inductance
increase inductance
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ABR200 Antenna Tuning Manual
Example for an antenna, where the inductance is too high:
In that example the antenna inductance is too high and the coil is too much to the middle of the
ferrite (voltage too low and peak more to the left). Move the coil more to the top of the ferrite. In
case of air-coils or casted ferrite antennas, remove capacitance on your end. If all your
additional capacitance is removed and the inductance is still too high, remove 1 turn (or more
turns if necessary) from the antenna coil.
Capacitor selection
Because of their smaller size you should use SMD capacitors only. In case of SMD capacitors
only NP0 (C0G) types should be used. The rated voltage must be at least 500V. The required
capacities depend on the deviation of your antenna inductance from the target inductance
(275µH). This can be calculated fairly easy using the formula for the resonant frequency.
Trouble shooting
For any problem please contact us:
Agrident GmbH
Steinklippenstr. 10
30890 Barsinghausen
Germany
Telephone
FAX
+49 5105 582573-10
+49 5105 582573-17
Mail: support@agrident.com
18/12/13
Page 8 of 8

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