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Antenna Pulls In NFC Applications

Nov. 4, 2010

Suitable for mobile telephones and portable wireless devices, a new stamp-sized antenna from Pulse, a Technitrol Company, operates in the 13.56-MHz near-field-communications (NFC) and is integrated with a second antenna with cellular frequency ranges of 824 to 960 MHz and 1710 to 2170 MHz for wireless connectivity using GSM and WCDMA in a single device. The stamp antenna, which measures 15 x 20 x 5 mm, can read small radio-frequency-identification (RFID) tags with diameters from 15 to 65 mm at distances from 5 to 20 mm. The RoHS-compliant NFC antenna operates at 13.56 MHz with an H-field of 1.5 A/m and a return loss of 25 dB. It is integrated with a cellular antenna with 58-percent efficiency from 824 to 960 MHz and 59-percent peak efficiency from 1710 to 2170 MHz. Both antennas have 50-Ohm impedance and operating temperature range of -40 to +80 deg.C. The separate NFC antenna can be integrated into a mobile device's back cover with a snap-fit structure.

About the Author

Jack Browne | Technical Contributor

Jack Browne, Technical Contributor, has worked in technical publishing for over 30 years. He managed the content and production of three technical journals while at the American Institute of Physics, including Medical Physics and the Journal of Vacuum Science & Technology. He has been a Publisher and Editor for Penton Media, started the firm’s Wireless Symposium & Exhibition trade show in 1993, and currently serves as Technical Contributor for that company's Microwaves & RF magazine. Browne, who holds a BS in Mathematics from City College of New York and BA degrees in English and Philosophy from Fordham University, is a member of the IEEE.