NEAR FIELD COMMUNICATION ANTENNA FOR MOBILE HANDSET WITH METALLIC CASE

摘要

The present invention relates to an NFC antenna of a mobile communications terminal having a metallic case, comprising: an NFC antenna feeding part and impedance matching circuit (1) which is realized on a metallic case of the backside of a mobile communications terminal to be operated at 13.56 MHz within a maximum 10cm distance; the metallic case (2) of the backside of the mobile communications terminal; an FR4 substrate (3) which is mounted right under the metallic case (2) of the backside of the mobile communications terminal; a lower part (4) which is a part where an NFC antenna is to be realized and which is acted as an emitter for transmission (Tx) and reception (Rx) and is not included in a metallic part of the metallic case (2) of the backside of the mobile communications terminal; an upper part (5) which is a part where the NFC antenna is to be realized and which is acted as an emitter for reception (Rx) and is not included in the metallic part of the metallic case (2) of the backside of the mobile communications terminal; a thin crack part (6) to configure a loop antenna on the upper part (5) which is not included in the metallic part of the metallic case (2) of the backside of the mobile communications terminal; a thick crack part (7) to configure the loop antenna on the upper part (5) which is not included in the metallic part of the metallic case (2) of the backside of the mobile communications terminal; and a part (8) which is folded to the downward wall surface of the loop antenna on the upper part (5) of the metallic case (2) of the backside of the mobile communications terminal, wherein the metallic case itself is realized as a single turn loop antenna on the backside case of the mobile communications terminal using a 13.56 MHz NFC antenna.