Tiny antennas suit RFID applications

A range of miniature, isotropic antennas is designed for RFID applications such as keyless entry, keyless go and RFID safety systems and anti-theft devices.

Available now from Copernica is a range of miniature, isotropic antennas designed for RFID applications such as keyless entry, keyless go and RFID safety systems and anti-theft devices.

Manufactured by German company Neosid, for which Copernica is the sole UK distributor, all the antennas operate at 125kHz and have Q factors from 23 to 30.

Sensitivity values range from 45 to 120mV/A/m and inductance values of the individual coils are typically 2.38, 2.47 or 4.70mH.

Other inductance, sensitivity and Q values are available to special order, together with a full custom design service.

All variants can be specified as lead free.

The antennas have a three-dimensional arrangement of the coils, as opposed to the customary individual coils for the x-, y- and z-axes, ensuring a highly homogenous sensitivity on all three levels.

Models in the range are the 3D 11 (11.0 x 11.0 x 2.5mm), 3D 14 (14 x 14 x 3.0mm) and 3D 15 (15 x 15 x 3.5mm).

To support fully automatic assembly, the antennas can be supplied with a pick and place dot surface (ASF) and a heat seal surface (HSF), which help secure the component to the PCB during reflow soldering.

Neosid holds patents on both these developments.

If required the antennas can be supplied with a protective plastic housing.

Suitable for both reflow and vapour phase soldering, the maximum soldering temperature is 230C for 5s; or 260C for 10s for lead-free devices.

Operating temperature range is -40 to +125C.

The antennas are supplied blister packed.

Neosid SMD products available from Copernica include chip and power inductors, tunable air coils, rod core chokes, wideband and toroidal-core transformers and tunable RF coils.

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