CN1241442C - Mobile phone built-in antenna module - Google Patents

Abstract

The invention provides a built-in antenna module of mobile phone, comprising: a first flat antenna, responding to a first frequency band, one end of which is connected with a first winding antenna, and the other end is connected with a second winding antenna; a second plate-like antenna, which is isolated from the first plate-like antenna and is responsive to a second frequency band, and one end of which is connected with the first winding-folding antenna in a conduction way, and the other end of which is connected with the second winding-folding antenna in a conduction way; the first winding and folding antenna and the second winding and folding antenna are respectively connected to the signal feed-in end and the grounding end of the mobile phone circuit board.

Description

Mobile phone built-in antenna module

Technical field

The invention relates to a mobile phone built-in antenna module, in particular to a mobile phone built-in antenna module with stable sending and receiving signals, reduced volume and flexible installation.

Background technique

The use of the current mobile phone can be said to have reached the point where everyone has one mobile phone. Because the radio signal is used to transmit the signal, the antenna structure used to sense the radio is an extremely important device in the mobile phone. As far as the current common mobile phones are concerned, most of them are designed with exposed antennas, that is, the antennas protrude outside the mobile phone casing to receive or transmit radio signals. However, due to the vulnerability of such exposed antennas to foreign objects The shortcomings of large electromagnetic waves are generated when bending, breaking and receiving or transmitting radio due to collision. Therefore, there are also built-in antennas installed inside the mobile phone case, which make the antenna less likely to be damaged and reduce the influence of electromagnetic waves.

As shown in Figure 1, it is a kind of existing mobile phone dual frequency built-in antenna device 6, and it has a housing 60, a first planar antenna 61, and a first plank antenna 61 spaced apart from the first Two planar antennas 62. The first planar antenna 61 is laid on the upper surface 601 of the housing 60 to respond to high-frequency signals. One end of the antenna 61 is connected to a coil spring 611 located in the housing 60, and the other end is also connected to a coil spring 611 located in the housing 60. The coil spring 612. The second planar antenna 62 is also spaced from the first planar antenna 61 on the upper surface of the housing 60, and has an area larger than the first planar antenna 61, in order to respond to low-frequency signals, and one end below it is also connected to a The other end of the coil spring 621 in the housing 60 is connected to a coil spring 622 in the housing 60 . The areas of the two planar antennas 61 and 62 are related to the predetermined signal frequency bands of the communication system they respond to.

Please refer to Fig. 2 together, in order to make this antenna device 6 can be electrically connected with the circuit board 71 of mobile phone 7 and move, do not guide corresponding flat antenna 61, One end of 62 is respectively connected to a feed-in conductive terminal 64, and one end of the other coil springs 612, 622 not connected to the corresponding planar antenna 61, 62 is also connected to a grounding conductive terminal 65 respectively. As shown in FIG. 1 , one end of each conductive terminal 64 , 65 is clamped to the housing 60 , and the other end extends vertically downward for a certain distance and then bends to extend vertically. And because of the setting of the conductive terminals 64, 65, two signal feed-in terminals must also be set on the mobile phone circuit board 71 to connect the feed-in conductive terminal 64 and the two ground terminals with power supply, and to connect the ground conductive terminal 65 with power supply. Therefore, as shown in FIG. 2 , when the antenna device 6 is assembled in the mobile phone 7 , the conductive ends 641 , 651 of the conductive terminals 64 , 65 must be connected and fixed on corresponding terminals of the circuit board 71 .

However, in practical applications and manufacturing processes, the above-mentioned antenna device 6 still has many disadvantages as follows:

1. Unstable response frequency band: Taking the first planar antenna 61 as an example, it works together through its own area and the corresponding two sets of helical coils 611 and 612 to correspond to a preset response frequency band. However, due to the helical coils 611 and 612 It is a three-dimensional elastic object, which is often susceptible to external forces, pultrusion, torsion, deformation or change of pitch, resulting in an error between its actual inductive effect and relative response frequency band and the original design value, so the effect of receiving and sending signals from mobile phones obtained by it is not good. Stablize.

Two, the volume is relatively large: the existing antenna device 6 needs to have upper and lower layers of independent planar antennas 61, 62, and corresponding two sets of helical coils 611, 612, 621, 622, so it needs to occupy a certain height space Moreover, it consumes more materials and parts, and the internal space and overall volume of the mobile phone it is installed on also needs to be larger, which is obviously contrary to the trend of personal communication products striving for lightness and compactness.

3. Lack of installation flexibility: the flat antennas 61, 62 and other components are arranged in a fixed-shaped housing 60, which cannot be slightly deformed or flexed according to the installation space conditions inside the mobile phone, so the mobile phone needs to be matched with the housing 60 The size and shape reserve a specific space, but it is impossible to make the most economical and efficient configuration and utilization of the overall internal space.

Contents of the invention

An object of the present invention is to provide a mobile phone built-in antenna module with stable sending and receiving effect, which is easy to adjust the response frequency range, reduces the overall volume and saves the internal space of the mobile phone, and has high installation flexibility.

The object of the present invention is achieved by providing a mobile phone built-in antenna module, which is installed inside the mobile phone casing and electrically connected to the circuit board in the mobile phone. The antenna module includes: a first planar antenna , has a certain area to respond to a first frequency band, one end of which is connected to a first zigzag antenna, and the other end is connected to a second zigzag antenna; a second planar antenna is connected to the first planar antenna The antenna is arranged on the same plane and is isolated from the first planar antenna so that it cannot be electrically conducted. The second planar antenna has a certain area to respond to a second frequency band, and one end thereof is connected to the first folded antenna. , and the other end is connected with the second zigzag antenna; the first zigzag antenna is in a continuous zigzag shape, and one of the first zigzag antennas is connected to the signal feed of the circuit board end; and the second zigzag-shaped antenna is also in a continuous zigzag shape, and one of the second zigzag-shaped antennas is connected to the ground terminal of the circuit board.

Therefore, the present invention replaces the helical coil with a folded antenna, and has a relatively stable response frequency band. By changing the position of the ground point and the signal connection point, the range of the two frequency bands can be elastically adjusted at the same time, and the overall volume is reduced and the cost is reduced. And it can be made into a flexible thin sheet as a whole, so it has a high degree of flexibility in installation shape and size.

Description of drawings

FIG. 1 is a perspective view of an existing dual-frequency antenna device;

FIG. 2 is a perspective view of the existing dual-frequency antenna device of FIG. 1 assembled inside the mobile phone;

Fig. 3 is a plan view of a preferred embodiment of the mobile phone built-in antenna module of the present invention;

FIG. 4 is a three-dimensional schematic view of the preferred embodiment assembled inside the mobile phone.

Detailed ways

A preferred embodiment of the present invention shown in Fig. 3 and Fig. 4 mainly includes a body 1, a first folded antenna 2 and a second folded antenna 3, and are integrally arranged on a mobile phone 4 casing internal.

The main body 1 is roughly a rectangular thin plate, on which a larger-area first planar antenna 11 and a smaller second planar antenna 12 are formed by conductive materials (such as metal), wherein the first planar antenna 11 has an area Suitably responsive to a lower first frequency band, the area of the second planar antenna 12 is responsive to a higher second frequency band. Between the first planar antenna 11 and the second planar antenna 12, there is an L-shaped strip-shaped insulating region 13, the long side end (upper) end of the L-shaped insulating region 13 extends to the upper edge of the body 1, and the short side end ( The right end extends to the right edge of the body 1, so that the two planar antennas 11, 12 are isolated from each other and cannot be electrically connected. In the actual production process, the main body 1 can form two isolated copper foils (i.e., planar antennas 11, 12) on the surface of an insulating substrate, and the exposed substrate between the two copper foils is used as the insulating region 13. Any structure or method for electrically isolating the flat conductors (that is, the respective antennas 11, 12) is applicable.

The first planar antenna 11 forms a first connection end 111 on the near left side of the upper edge in FIG. The first connection end 111 and the second connection end 121 are respectively connected to the first connection arm 21 and the second connection arm 22 on the left and right sides of the first zigzag antenna 2 . The first folded antenna 2 in the shape of a planar sheet extends upward for a certain distance from its two connecting arms 21 , 22 , and then is folded vertically and relatively continuously along the left and right directions to form a plurality of first folded portions 23 that are perpendicular to each other. The first folded portion 23 has a specific position and is provided with a signal connection point 24 to be electrically connected to a signal feed-in terminal 411 of the circuit board 41 in the mobile phone 4 .

The first planar antenna 11 forms a third connection end 112 on the lower side of the right edge in the figure, and the second planar antenna 12 forms a fourth connection end 122 on the lower side of the right edge. The third connecting end 112 and the fourth connecting end 122 are respectively connected to the third connecting arm 31 on the lower side of the second zigzag antenna 3 and the fourth connecting arm 32 on the upper side. The second folded antenna 3, which is also in the shape of a plane sheet, extends from its two connecting arms 31, 32 to the right for a certain distance, and then is folded vertically and relatively continuously in the up and down direction to form a plurality of second folded portions perpendicular to each other. 33 . The second folded portion 33 extends upward for a certain distance through the upper fourth connecting arm 31 . In this embodiment, the total length of the second folded portion 33 is greater than that of the first folded portion 23 . The second folded portion 33 has a specific position and is provided with a grounding point 34 for electrically connecting to a grounding terminal 412 of the circuit board 41 in the mobile phone 4 .

It should be noted that the shape of the above-mentioned first and second bending parts 23, 33 is not limited to continuous vertical bending up and down along the same plane as shown in this preferred embodiment. The curved arc or other non-perfect straight line structure with inductive effect all falls within the essential scope of the present invention.

According to the above structure, with the ground point 34 of the second folded portion 33 as a reference, the second folded portion 33 below the ground point 34, the first planar antenna 11 and the first fold on the left side of the signal connection point 24 can be Part 23 works together to respond to the aforesaid lower first frequency band; and the second winding part 33 above the ground point 34, the second planar antenna 12 and the first winding on the right side of the signal connection point 24 Section 23 cooperates to respond to the aforesaid higher second frequency band. At the same time, through the adjustment and change of the positions of the ground point 34 and the signal connection point 24, the corresponding bandwidth range can be changed, and the length of the second winding portion 33 above the fourth connecting arm 32 can also be changed according to its response. The range of the second frequency band is fine-tuned.

In summary, the present invention has the following advantages:

1. Response frequency band is stable: the helical coil of the existing mobile phone hidden antenna is easily deformed by external force, causing an error between the actual response frequency band and the original design value; the present invention abandons the three-dimensional elastic helical coil design and uses a flat and The folded antennas 2 and 3 which are not easily deformed by external forces are replaced, so the corresponding response frequency bands are relatively stable, and a better effect of sending and receiving signals by the mobile phone can be obtained.

Two, the response frequency band is easy to adjust: as mentioned above, the present invention only needs to change the positions of the ground point 34 and the signal connection point 24 to simultaneously elastically adjust the range of the first and second frequency bands without wrapping the folded antenna 2 , 3 and other components in accordance with the increase or decrease in length, so it can be easily adjusted to be suitable for different bandwidths used in various regions; and through the increase or decrease in the length of the second winding part 33 above the fourth connecting arm 32, it can also be directly related to its response The frequency range is fine-tuned.

3. Volume reduction and cost reduction: The existing dual-frequency hidden antenna needs to have two independent planar antennas on the upper and lower layers, and corresponding two sets of helical coils, so it needs to occupy a certain height space; the present invention changes the two The planar antennas 11, 12 are arranged on the same plane, and the four sets of helical coils are simplified into two folded antennas 2, 3, which not only can reduce the cost of materials, but also greatly reduce the overall height, and the area in the plane direction There is also no significant increase, so the internal space of the mobile phone it is installed in can be relatively reduced, which is especially important for the structure and shape of mobile phones that emphasize lightness, lightness and compactness.

4. High installation flexibility: Also because the body 1 and the folded antenna 2 and 3 are arranged in a plane as a whole, and can be made into a thin sheet with a certain degree of flexibility, it can be moderately bent and deflected according to the shape of the limited space inside the mobile phone, so it has Maximum installation shape and size flexibility.

The above only describes the embodiments of the present invention, but does not limit the present invention. Various changes or modifications made according to the spirit of the present invention are included in the claims of the present invention.

Claims (11)

1. a built-in antenna module for mobile phone is installed in hand set machine shell inside, and is electrically connected with circuit board in this mobile phone, and this Anneta module comprises:

One first tabular antenna has certain area with in response to one first frequency band, and the one end connects one first curved type antenna, and the other end then connects one second curved type antenna;

One second tabular antenna, be located at same plane with this first tabular antenna, and with this first tabular antenna can't conduct the ground isolation configuration, this second tabular antenna has certain area with in response to one second frequency band, one end and this first curved type antenna connect, and the other end then connects with this second curved type antenna;

This first curved type antenna is continuous curved type, and the place on this first curved type antenna connects the signal feed side to this circuit board; And

This second curved type antenna also is continuous curved type, and the place on this second curved type antenna connects the earth terminal to this circuit board.

2. built-in antenna module for mobile phone as claimed in claim 1, wherein this first curved type antenna and the second curved type antenna isolation are arranged at same plane.

3. built-in antenna module for mobile phone as claimed in claim 1 or 2, wherein this first curved type antenna integral body is positioned at same plane.

4. built-in antenna module for mobile phone as claimed in claim 1 or 2, wherein this second curved type antenna integral body is positioned at same plane.

5. built-in antenna module for mobile phone as claimed in claim 3, wherein this first curved type antenna is vertically to form around folding continuously along same plane.

6. built-in antenna module for mobile phone as claimed in claim 4, wherein this second curved type antenna is vertically to form around folding continuously along same plane.

7. built-in antenna module for mobile phone as claimed in claim 1, wherein this Anneta module also comprises an insulated substrate, itself and this first tabular antenna and the second tabular antenna are that same plane earth is arranged between this first tabular antenna and the second tabular antenna, and above-mentioned two tabular antennas are isolated mutually.

8. built-in antenna module for mobile phone as claimed in claim 1, wherein to connect to the position, signal feed side of this circuit board be to adjust to this first curved type antenna.

9. as claim 1 or 8 described built-in antenna module for mobile phone, wherein to connect to the earth terminal position of this circuit board be to adjust to this second curved type antenna.

10. built-in antenna module for mobile phone as claimed in claim 1, wherein this first curved type antenna has two relative outer ends along its length direction, and connects for this first tabular antenna and the second tabular antenna respectively with this two relative outer end.

11. as claim 1 or 10 described built-in antenna module for mobile phone, wherein this second curved type antenna has an outer end along its length direction, connects for this first tabular antenna, and connects for this second tabular antenna with one place, inboard along this length direction.

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