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ANT-125K, RF Solutions ANT-125K Dáileacháin - Electronics-ic.com
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Micro RWD 125kHz Antenna Specification
The Micro RWD has been designed to interface to a simple low Q (10-20) antenna coil
of around 700uH (micro Henry) inductance operating at a carrier frequency of 125 kHz.
For maximum range and performance the following factors should be considered:
1) Maximum range and coupling between transponder and RWD is based on the ratio
of their antenna diameters. Very approximately the RWD antenna loop diameter
should be 2-3 times the diameter of the transponder coil. The basic method of
communication is via magnetic flux linkage (like an air-cored transformer) so the
more lines of flux that intersect the transponder coil, the better the overall
performance. For ISO card transponders there is little benefit in using an RWD
antenna larger than 10cm diameter. Circular antenna coils generally give a more
2) The Micro RWD is designed to give up to 400ma pulse current with a peak voltage
of up to 200v. This can give a 20cm read/write range with HT2 ISO card
transponders. Lower burst current can be achieved by inserting an additional series
resistor in the antenna loop circuit (22R in series would typically reduce pulse
current/voltage by about half using example antennas). This is recommended in
order to give the optimum signal-to-noise ratio and Q value.
3) Sample antenna supplied is for demonstration only. The characteristics of an
antenna for EMC/WT approval will vary according to shape of coil, type of wire
used, style of winding, bobbin material, compaction of windings etc.
4) If the antenna is to be positioned remote to the Micro RWD a screened twisted pair
cable can be used to connect them. The screen should be connected to the Antenna
GND pin on the Micro RWD. Cable lengths up to 1.5 metres have been tested and
perform well with no significant system degradation.
5) The capacitance and inductive effect of antenna cable and physical positioning of
the antenna should be taken into account when designing the antenna coil and if
necessary the inductance of the coil should be adjusted to compensate. The 125KHz
tuned circuit is basically an RLC network with the C element fixed on the Micro
RWD board. Tuning the antenna inductance (L) for optimum performance is quite
simple, the positioned antenna system should be connected to the Micro RWD and
power applied. An oscilloscope should be connected between the AN 2 pin and the
GND pin. Without a transponder in the field a pulsed 125kHz sine wave will be
seen with a peak voltage of up to +/-180v, with small switching “steps” visible near
the peaks and troughs of the sine wave.
ANT-125K Achoimre na n-ábhar
ib techno logy 1 Data Sheet ANTENNA_1 25.PDF 4 Pages Last Revise d 21/09/ 09 Micro RW D 125kHz Antenna Specif ication The Mi cro RWD has been designed to inte rface to a simple low Q (10-20) a ntenna coil of around 700uH (micro Henry) induc tance operating at a carrie r frequency of 125 kHz. For maxi mum range and performance the f ollowing factors should be c onsidered: 1) Maximum range and coupling be tween transponder and RWD is b ased on the ratio of their a ntenna diameters. Very approximate ly the RWD antenna loop diame ter should be 2-3 times the diameter of the tra nsponder coil. The
ib techno logy 2 Optimum tuni ng and performance is achie ved when these “steps” are seen exac tly at the maxi mum and minimum points of the sine wave, the peak voltage wi ll also be at its ma ximum value. The ante nna series resistor (R) should be set to limit the peak voltage t o 110v maximum in order to give the best Q value and optimum signal-to- noise ra tio (For practical purposes use + /-100v peak voltage as l imit) . 6) For optim um performance the anten na Q should not exceed 20 and t o achieve relia ble tuning at 125kHz the antenna ind uctance should be around 700uH. Higher Q a
ib techno logy 3 8) Ferrite Shielding When the RWD antenna coil is positi oned close to metal objects suc h as the reader housing or e ven the PCB ground pla ne then the RF field induces eddy curre nts in the met al. This absorbs the RF field ene rgy and has the effect of detuning the antenna (re ducing the inductance). Both these factors can very signifi cantly affec t the pe rformance of the RWD system. Therefore for operation i n metallic environments i t may be necessary to s hield the antenna with ferrite. This shieldi ng has the effect of concentratin g the magnetic field lines close to
ib techno logy 4 Example Antennas A) 0.236mm diameter (34 swg) Ena melled Cu wire. Antenna 14.5cm internal diameter, 45 turns. Approx 70 0uH Maximum range: approx 20cm with HT2 card transponders B) 0.236mm diameter (34 swg) Ena melled Cu wire. Antenna 10cm internal diameter, 55 t urns. Approx 70 0uH Maximum range: approx 15cm with HT2 card transponders C) 0.236mm diameter (34 swg) Ena melled Cu wire. Antenna 7cm internal diameter, 67 turns. Approx 70 0uH Maximum range: approx 10-15cm with HT2 card transponders Examples of a ntenna (C) and a very small antenna for applications wi th limited sp
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