Abstract: A holding device having a printed circuit board includes a base having a securing recess at a top surface thereof, a securing connector fixed in the securing recess and connected with the printed circuit board, a holding shell rotatably covered to the securing connector, and a flexible antenna of flat plate shape. The antenna has a rectangular radiating body, and a strip-shaped connecting portion extended outwards from a side of the radiating body. A free end of the connecting portion is held by the holding shell and rotated to connect with the securing connector electrically and detachably. An exposed portion of the connecting portion is bent so that the radiating body is attached to the top surface of the base.

Abstract: A holding device having a printed circuit board includes a base having a securing recess at a top surface thereof, a securing connector fixed in the securing recess and connected with the printed circuit board, a holding shell rotatably covered to the securing connector, and a flexible antenna of flat plate shape. The antenna has a rectangular radiating body, and a strip-shaped connecting portion extended outwards from a side of the radiating body. A free end of the connecting portion is held by the holding shell and rotated to connect with the securing connector electrically and detachably. An exposed portion of the connecting portion is bent so that the radiating body is attached to the top surface of the base.

Abstract: A RFID antenna etched on a printed circuit board defined a first edge and a second edge includes a first antenna radiator, a second antenna radiator and a tag chip. The first antenna radiator located at the second edge has a first radiating portion. A first connecting portion bends outwards from an end of the first radiating portion. A second radiating portion extends from an end of the first connecting portion. A third radiating portion bends inwards from an end of the second radiating portion. The second antenna radiator has a fourth radiating portion extended along the first edge. A second connecting portion bends outwards and towards the first radiating portion from an end of the fourth radiating portion. A fifth radiating portion extends along the second edge from an end of the second connecting portion. The tag chip locates between the third radiating portion and the fifth radiating portion.

Abstract: A wireless trading system used for trading by an electronic money card includes a reading device including a reading unit for wirelessly reading account information of the electronic money card and a transmitting unit for transmitting out the account information read by the reading unit, a communication device, a commerce platform for providing the service of trading, and a payment platform for providing the service of paying trading bills.

Abstract: A RFID antenna etched on a printed circuit board defined a first edge and a second edge includes a first antenna radiator, a second antenna radiator and a tag chip. The first antenna radiator located at the second edge has a first radiating portion. A first connecting portion bends outwards from an end of the first radiating portion. A second radiating portion extends from an end of the first connecting portion. A third radiating portion bends inwards from an end of the second radiating portion. The second antenna radiator has a fourth radiating portion extended along the first edge. A second connecting portion bends outwards and towards the first radiating portion from an end of the fourth radiating portion. A fifth radiating portion extends along the second edge from an end of the second connecting portion. The tag chip locates between the third radiating portion and the fifth radiating portion.

Abstract: A communication system includes a phone device and an electronic card. The phone device includes a microprocessor, a dialing unit and an identifying unit connected with the microprocessor respectively. The identifying unit includes a reader and an induction antenna. The electronic card includes a tag antenna having a matching frequency with the induction antenna, and a memory unit storing a plurality of telephone numbers therein. The reader can wirelessly read the telephone numbers in the memory unit by means of the induction antenna and the tag antenna and further transmit the telephone numbers into the microprocessor. Then the dialing unit generates pulse signals according to the telephone numbers from the microprocessor and further sends the pulse signals out. A method of using the above-mentioned communication system includes: placing the phone device in an off-hook state, and placing the electronic card within an effective range of the identifying unit.