SIM card radio frequency antenna device for mobile communication terminal
Technical Field
The utility model relates to a radio frequency antenna technique of multi-functional SIM card, in particular to SIM card radio frequency antenna device for mobile communication terminal.
Background
As is well known, a Dual-Interface (Dual-Interface) SIM card is a multifunctional SIM card, which has two interfaces, a contact Interface and a non-contact Interface, wherein the contact Interface can implement a telecommunication function, and the non-contact Interface can implement a non-telecommunication function such as mobile payment. The dual-interface SIM card communicates with the non-contact terminal through the RF antenna, so that the non-telecommunication functions such as mobile payment of the non-contact interface are applied.
Mobile payment is an emerging value-added service for mobile communications. In the process of realizing the mobile payment function, a Radio Frequency (RF) interface on the dual-interface SIM card is responsible for receiving and transmitting information from the non-contact card reader, and meanwhile, the normal telecommunication application function of the SIM card is not influenced.
The function of the dual-interface SIM card non-contact interface requires an external RF antenna, and when connecting the RF antenna, the RF antenna needs to be connected to the non-contact interface of the SIM card by using the idle contacts C4 and C8 (as shown in fig. 1) of the dual-interface SIM card module. Because the non-contact interface of the dual-interface SIM card is a passive body, when the non-contact card reader carries out read-write operation on the card, a signal sent by the non-contact card reader is formed by superposing two parts: one part is a power supply signal, and the signal generates resonance with the L/C of the signal after being received by the card to generate instant energy to supply the chip to work; the other part is to combine the data signal to command the chip to complete the read-write, modification, storage, etc. of the data and return to the non-contact card reader.
For a mobile communication terminal such as a mobile phone, because a dual-interface SIM card needs to be inserted into the mobile phone, an RF antenna of the dual-interface SIM card inevitably approaches a mobile phone battery, and a housing of the mobile phone battery is mostly metal, so when a non-contact card reader is driven by the RF antenna and reads the dual-interface SIM card, magnetic lines of force of the antenna of the non-contact card reader will pass through the antenna of the dual-interface SIM card, and at this time, the magnetic lines of force vertically act on a metal surface of the mobile phone battery, and an eddy current is formed on the metal surface of the mobile phone battery, which causes energy loss, so that a non-contact channel of the dual-interface SIM.
Fig. 2 is a schematic diagram of the operation of the non-contact terminal and the dual-interface SIM card RF antenna, which includes a non-contact terminal 201, a mobile phone rear cover 202, a dual-interface SIM card 203, an RF antenna 204, a magnetic conductive material 205, and a mobile phone battery 206. Normally, when the RF antenna 204 of the dual-interface SIM card 203 is close to the antenna of the contactless terminal 201, magnetic lines of force generated by the antenna of the contactless terminal 201 pass through the RF antenna 204, so that the RF antenna 204 of the dual-interface SIM card 203 generates a current to activate a contactless communication channel. However, as can be seen from fig. 2, magnetic lines of force generated by the antenna of the contactless terminal 201 act perpendicularly on the metal surface of the mobile phone battery 206 when passing through the RF antenna 204, and eddy currents are formed to cause field distortion, which interferes with the normal operation of the RF antenna 204 to cause energy loss, thereby preventing the contactless communication channel from being activated normally.
In summary, in order to implement mobile payment by using a dual-interface SIM card, the problem of interference of a mobile phone battery on an RF antenna of the dual-interface SIM card must be solved.
In order to solve the above problems, the prior art provides the following solutions:
scheme for customizing rear cover of mobile phone
This scheme needs the special cell-phone back cover of customization, and the lid can outwards thicken behind the cell-phone of customization, pastes lid inboard behind the cell-phone the RF antenna of two interface SIM cards to cover behind the cell-phone the two interface SIM cards inserted, non-contact interface and RF antenna connection, wherein: one end of a flexible cable can be connected with the contact interface of the double-interface SIM card, and the other end of the flexible cable bypasses the mobile phone battery to be connected with the SIM card slot of the mobile phone. The purpose of doing so is to increase the distance between cell-phone battery and the RF antenna to weaken cell-phone battery to the interference of RF antenna, guarantee that the non-contact interface of double-interface SIM card normally works.
The disadvantage of this scheme is that a dedicated mobile phone rear cover needs to be designed, and the mobile phone rear cover needs to be replaced if a user wants to use the mobile phone for payment, so that the cost of application and popularization is greatly increased.
Low-cost antenna assembly scheme
The scheme does not need to modify the mobile phone and the mobile phone rear cover, and the flexible RF antenna and the flexible cable are integrated by designing the flexible RF antenna. One end of the flexible cable is connected with the flexible RF antenna, the other end of the flexible cable bypasses the mobile phone battery and is connected with the non-contact interface of the double-interface SIM card, the flexible RF antenna leans against the mobile phone battery, and a layer of magnetic conductive material is arranged between the flexible RF antenna and the battery. The magnetic conductive material between the flexible RF antenna and the mobile phone battery is used for changing the direction of magnetic lines of force, so that the magnetic lines of force cannot vertically act on the mobile phone battery, further, eddy current is inhibited, and current loss is reduced.
The scheme has the defects that the effect of the magnetic conductive material is very limited, and test results show that the interference of a mobile phone battery on the dual-interface SIM card RF antenna cannot be completely overcome, so that the stable work of the dual-interface SIM card RF antenna cannot be ensured.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a SIM card radio frequency antenna device for mobile communication terminal for under the prerequisite of realizing the telecom function, the lid behind most users need not change new cell-phone or the dedicated cell-phone of customization, need not increase too many cost, just can be reliable and stable use non-telecom functions such as mobile payment.
The technical scheme of the utility model is that: a SIM card radio frequency antenna device for a mobile communication terminal, comprising: a radio frequency antenna; the radio frequency antenna accessory is used for bearing the radio frequency antenna and fixing the radio frequency antenna on the outer side of a mobile communication terminal battery; and the flexible connecting piece is used for connecting the radio frequency antenna with the SIM card positioned on the inner side of the mobile communication terminal battery.
The SIM card radio frequency antenna device for mobile communication terminal further includes: the SIM card accessory is used for bearing an SIM card and is connected with the flexible connecting piece; the flexible connecting piece is connected with the radio frequency antenna accessory, so that the SIM card positioned at the inner side of the mobile communication terminal battery is connected with the radio frequency antenna positioned at the outer side of the mobile communication terminal battery.
The SIM card accessory is provided with a connecting end connected with two contacts of SIM cards C4 and C8, and a connecting end connected with the flexible connecting piece.
The SIM card accessory is provided with a plurality of connecting ends used for being connected with the flexible connecting piece, the connecting ends extend to different directions, and only one connecting end with a proper extending direction is adopted to be connected with the flexible connecting piece.
Those of the plurality of connecting terminals that are not connected to the flexible connector are cut away from the SIM card mating member.
The radio frequency antenna fitting is provided with a metal sheet 301 and a metal sheet 302; the flexible connecting piece comprises a flexible connecting component with a metal electrode and a flexible conductor component; wherein,
the metal sheets 301 and 302 are connected to the metal electrodes, the flexible connecting assembly with metal electrodes is connected to the flexible conductor assembly, and the flexible conductor assembly is connected to the SIM card.
The radio frequency antenna assembly is provided with a spring contact group 101 and a spring contact group 102; the flexible connecting piece comprises a flexible connecting component with a metal electrode and a flexible conductor component; the spring contact group 101 and the spring contact group 102 are connected to the metal electrodes, the flexible connecting assembly with the metal electrodes is connected to the flexible conductor assembly, and the flexible conductor assembly is connected to the SIM card.
The radio frequency antenna is fixed on the outer side of the non-battery rear cover of the mobile communication terminal by the radio frequency antenna accessory; the rear cover is provided with a through hole, and the spring contact group 101 and the spring contact group 102 are fixed on the radio frequency antenna outside the rear cover and are connected with the metal electrode through the through hole of the rear cover.
The SIM card radio frequency antenna device for mobile communication terminal further includes: and the cover covers the radio frequency antenna accessory, and the radio frequency antenna is connected with a capacitor.
The mobile communication terminal is a mobile phone or a PDA; the SIM card refers to a dual-interface SIM card.
The beneficial effects of the utility model reside in that, through providing a SIM card radio frequency antenna device for mobile communication terminal, under the condition that need not reform transform the cell-phone, improved the compatibility of double-interface SIM card and the reliable and stable nature of work, greatly reduced the cost of popularization of new application, can effectively promote the popularization of mobile payment, create new economic benefits.
Drawings
FIG. 1 is a diagram illustrating a SIM card module according to the prior art;
FIG. 2 is a schematic diagram of a non-contact terminal and an RF antenna of a SIM card in the prior art;
fig. 3 is a structural view of a radio frequency antenna accessory according to embodiment 1 of the present invention;
FIG. 4 is a schematic view of a SIM card accessory having four connection points according to the present invention;
FIG. 5 is a schematic view of the SIM card accessory of FIG. 4 with three connection points cut away;
fig. 6a to 6c are schematic assembly views of a radio frequency antenna assembly according to embodiment 1 of the present invention;
fig. 7a is a schematic view of the connection between the flexible connecting assembly with metal electrodes and the flexible conductor assembly according to the present invention;
fig. 7b is a schematic view of a flexible conductor assembly of the present invention;
fig. 7c is a schematic view of a flexible connection assembly with metal electrodes according to the present invention;
fig. 8 is an assembly diagram of embodiment 1 of the present invention;
fig. 9 is a structural view of a radio frequency antenna accessory according to embodiment 2 of the present invention;
fig. 10a is an external view of the rear cover of the mobile phone of the present invention;
fig. 10b is a schematic view of the rear cover of the mobile phone of the present invention;
fig. 11a to 11c are schematic assembly views of embodiment 2 of the present invention;
fig. 12 is a schematic view of the final assembly of embodiment 2 of the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings. This solution comprises two main components: radio frequency antenna assemblies and dual interface SIM card assemblies, also known as flex cable adapters to which radio frequency antennas are connected. Wherein:
one end of the flexible cable is connected with the non-contact interface of the dual-interface SIM card through welding or bonding, and the other end of the flexible cable is designed into two contacts. The rf antenna is connected to the contacts of the flex cable.
Example 1
For a mobile phone with a back cover integrated with a battery, a radio frequency antenna is customized, a flexible cable bypasses the battery and is connected with a contact of the flexible cable connected with a dual-interface SIM card through an elastic device (such as a spring contact). The detailed description of the device is as follows: the radio frequency antenna assembly carries a non-contact antenna (radio frequency antenna) for communicating with a non-contact terminal and is fixed on a mobile phone battery (the fixing process is shown in fig. 6a to 6C), and the tail ends of two side wings of the radio frequency antenna assembly are respectively provided with a metal sheet 301 and 302 (shown in fig. 3) for connecting metal electrodes 701 and 702 (shown in fig. 7C) on a flexible connecting component (also called as a flexible circuit connecting component 2) with metal electrodes, so that the connection with two contacts of SIM cards C4 and C8 is realized; the SIM card accessory is an adapter, one end of the SIM card accessory is connected with two contacts C4 and C8 of the mobile phone SIM card, and the other end of the SIM card accessory is connected with a flexible connecting component with a metal electrode (as shown in figure 7 a) through a flexible conductor component (as shown in figure 7b, also called as a flexible circuit 'connecting component 1'), so that the flexible connection of the mobile phone SIM card and a non-contact antenna is ensured, in order to be compatible with most mobile phones, the SIM card accessory is designed with connecting lines in four directions (as shown in figure 4), and the other three connecting lines can be cut off by selecting a proper connecting line according to different SIM card slot designs in different mobile phones (as shown in figure 5); two or three-way connection lines can also be provided.
The flexible circuit connecting assembly 1 is a flexible circuit, two ends of the flexible circuit are respectively provided with a metal electrode which is used for connecting the SIM card matching piece with the flexible circuit connecting assembly 2; the flexible circuit "connection assembly 2" is also a flexible circuit having two metal electrodes thereon for connecting to metal plates on the two side wings of the "radio frequency antenna assembly".
For a mobile phone without a back cover, the final assembly schematic diagram of the whole scheme is shown in fig. 8: one end of the SIM card accessory is connected with two contacts of C4 and C8 of the SIM card, the other end of the SIM card accessory is connected with a flexible circuit connecting component 2 through a flexible circuit connecting component 1, two metal electrodes on the connecting component 2 are respectively connected with metal sheets on two side wings of the radio frequency antenna accessory, and flexible and reliable connection of a non-contact antenna and the SIM card is guaranteed, so that stable and reliable non-contact communication between the mobile phone and a non-contact terminal is realized.
Example 2
For a mobile phone with a rear cover separated from a battery, a flexible cable connected with a dual-interface SIM card bypasses the battery to enable a contact of the flexible cable to face upwards, and the other surface of the flexible cable leans against the battery. Then, holes can be punched in the rear cover, the radio frequency antenna penetrates through the holes and is connected with the contact of the flexible cable through an elastic device, so that the reliability of connection is guaranteed, and the rear cover of the mobile phone and the battery are easy to detach. There is a certain distance between the radio frequency antenna and the rear cover of the mobile phone. The detailed description of the device is as follows: as shown in fig. 9, the "radio frequency antenna accessory" is a non-contact antenna, and is used for communicating with a non-contact terminal, and is fixed on the back cover of the modified mobile phone (see fig. 10a and 10b after the fixing, a certain distance is left between the non-contact antenna and the back cover of the mobile phone, and the non-contact antenna may be filled with a magnetic conductive material or not), two metal sheets are respectively welded with an elastic device (such as a spring) in the center of the accessory, and the other end of the elastic device respectively passes through two holes on the back cover of the modified mobile phone, and is connected with two metal electrodes on a flexible circuit "connection assembly 2" (see fig. 11a to 11C), so as to realize the connection with two contacts of the SIM card C4 and C8; the SIM card accessory is an adapter, one end of the SIM card accessory is connected with two contacts C4 and C8 of a mobile phone SIM card, and the other end of the SIM card accessory is connected with a connecting component 2 through a flexible circuit connecting component 1, so that the flexible connection of the mobile phone SIM card and a non-contact antenna is ensured, in order to be compatible with most mobile phones, the SIM card accessory is designed with connecting lines in four directions, and the other three connecting lines can be cut off by selecting a proper connecting line according to different SIM card slot designs in different mobile phones (see fig. 4 and 5); the flexible circuit connecting assembly 1 is a flexible circuit, two ends of the flexible circuit are respectively provided with a metal electrode which is used for connecting the SIM card adapter with the connecting electrode assembly 2; the flexible circuit "connection assembly 2" is also a flexible circuit, on which two metal electrodes are provided for connecting elastic devices welded to the "radio frequency antenna assembly".
For a handset with a back cover, the final assembly of the whole system is schematically shown in fig. 12: one end of the SIM card accessory is connected with two contacts of C4 and C8 of the SIM card, the other end of the SIM card accessory is connected with a flexible circuit connecting component 2 through a flexible circuit connecting component 1, two metal electrodes on the connecting component 2 are connected with elastic devices 101 and 102 welded in the center of the radio frequency antenna accessory, and flexible and reliable connection of a non-contact antenna and the SIM card is guaranteed, so that stable and reliable non-contact communication between a mobile phone and a non-contact terminal is realized. The radio frequency antenna is adhered to the outer side of the rear cover of the mobile phone, a capacitor can be added on the antenna in order to improve the efficiency of the antenna, and the size of the capacitor is determined according to the actual situation.
The SIM card in the above embodiments may be a (U) SIM card, i.e. a 3G-capable SIM card.
The utility model provides a technical scheme makes the produced magnetic line of force of non-contact terminal's antenna directly pass the SIM card antenna and do not receive the interference of mobile phone battery's metal surface through the "disconnect-type" structural design of innovation, arrange the radio frequency antenna of SIM card in the outside of lid or battery (the cell-phone of no back lid) behind the cell-phone promptly, couple together through nimble convenient adapter, resilient means, flexible circuit and the inside SIM card of cell-phone, just so guaranteed the stability, the reliability of non-contact communication passageway work. In addition, because the inside SIM draw-in groove design diverse of various cell-phones, in addition in order to guarantee that the user can dismantle lid/battery behind the cell-phone at will, realize good compatibility and convenient easy-to-use, the utility model provides an adapter, resilient means and the flexible circuit of innovative design accomplish the SIM card and be connected between the contactless antenna.
The utility model has the effects that: the antenna providing the non-contact communication channel is placed outside the rear cover/battery of the mobile phone, so that the 'eddy' interference generated on the metal surface of the mobile phone battery is avoided, and the stable, reliable and normal operation of the non-contact communication channel is ensured;
on the premise of ensuring stable and reliable work of non-contact application functions, in order to facilitate a user to freely detach the rear cover/battery of the mobile phone, the flexible and reliable connection between the non-contact antenna and the flexible cable led out by the SIM card is realized through the elastic device with innovative design. As is well known, there are two types of back plates for mobile phones, one is a back cover of the mobile phone, and the other is a back plate without a back cover but only a back surface of a battery, so there are two types of corresponding elastic device designs:
the corresponding elastic device with the back cover is designed as follows: an elastic device is inserted after two holes are punched in the rear cover of the mobile phone, the part of the elastic device outside the rear cover of the mobile phone is connected with the non-contact antenna in a welding mode (the non-contact antenna and the rear cover of the mobile phone are at a certain distance and can be filled with magnetic conductive materials or not), the part of the elastic device inside the rear cover of the mobile phone is connected with a flexible circuit led out from the SIM card through an adapter, and the adapter is connected with two contacts C4 and C8 of the SIM card in a welding or bonding mode, so that the flexible and reliable connection of the non-contact antenna and the SIM card is guaranteed.
The design of the elastic device without the rear cover is as follows: a non-contact antenna is bonded on the back of the mobile phone battery, and a flexible circuit extending out of the non-contact antenna is connected with a flexible circuit led out of the SIM card through an adapter, so that the flexible and reliable connection of the non-contact antenna and the SIM card is ensured.
The innovative adapter design of compatible most of cell-phones, because the inside SIM card slot design diverse of various cell-phones, cell-phone inner structure also diverse, in order to guarantee good compatibility and convenient easy-to-use, the utility model provides an innovative design's adapter, because the various possible directions of SIM card insertion cell-phone have been considered in the design, such adapter both can compatible the inside SIM card slot design of various different cell-phones, the flexible circuit demand to connecting resilient means that has considered the different productions of cell-phone inner structure simultaneously again is different, so adopted nimble "transmission" connected mode design, can compatible various different cell-phones, realize the nimble of cell-phone SIM card and non-contact antenna, reliably be connected.
The above detailed description is merely illustrative of the present invention and is not intended to be limiting.