Ferrite-backed Embedded / NFC Antenna Pulse Part Number W3579 The W3579 is a flexible Near Field Communication (NFC) antenna ideal for tight-space embedded products such as tablets, laptops, and payment terminal devices. It is intended for secure payment or security access applications where connect distances are constricted to keep sensitive informa- tion safe. The W3579 has a semi-flexible sintered ferrite backing designed to optimize magnetic fields, thus increasing the corresponding field strength of the antenna. The W3759 is a thin, flexible antenna that can be fed with customer-supplied spring clips, contacts, direct-solder methods or with the use of Pulses own W9908/W9909 C-clips. Mounting the antenna is easily accomplished using the thin but aggressive holding adhesive backing. Recommended for mounting on the inside of battery covers, or locations where the antenna will be on or in close proximity to ground planes or displays. Features - Excellent performances on metal surfaces - Thin, semi-flexible structure - Easily assembles to device covers or mechanics - Well-known antenna concept, reliable technology - RoHS compliant product Applications - Mobile devices - Payment terminals - Sharing / pairing Electrical Specifications Frequency MHz * 13.56 Environmental Specifications 40 EMVCo Reading Distance mm * 28 Grid Scan (avg) Operating Temperature C -40 to +85 Impedance * 50 / 80 Self Resonance Frequency MHz ** 42 Mechanical Specifications Inductance H ** 1.6 Color Black Resistance ** 3.60 1.38 x 1.97 x 0.012 Q-Factor** 37.8 Dimensions in/mm (35 x 50 x 0.30) Matched Q Value*** 5-30 NOTE: Electrical characteristics depend on distance from metal objects and the location of the antenna on the device. Measured in free space * With matching network ** Bare coil without any matching network *** With matching network (adjustable). Typical network picture refer to page 2. San Diego, CA 858 674 8100 Vancouver, WA 360 944 7551 Europe 49 7032 7806 0 Asia 86 755 33966678 North Asia 886 3 4356768 China 86 512 6807 9998 1 pulseelectronics.com/products/antennas L150.B (2/14)Ferrite-backed Embedded NFC Antenna Pulse Part Number W3579 NOTE: Terminal Dimensions 5.75 x 2 mm Recommended matching network Component Value Note Lemc 560 nH Filter resonance at 15.4 MHz Cemc 180 pF Filter resonance at 15.4 MHz C1 25 pF Antenna matching component, value depends on the antenna environ- ment Antenna matching C2 180 pF Antenna matching component, value depends on the antenna Includes C2a and C2b values) environment Antenna matching Rq 0 Ohm Rq resistors used to lower Q-value Input EMC Filter Matching Q-factor Output to Antenna 22 pulseelectrpulseelectronics.onics.ccom/om/prproducts/oducts/antantennasennas L150.B (2/14)