CN204809389U - FPC antenna - Google Patents

Abstract

The utility model discloses a FPC antenna. This FPC antenna includes medium basement, copper sheet and black cover membrane, and the copper sheet setting is in the medium basement, and feed portion that the copper sheet was provided with the line of rabbet joint and was connected with the line of rabbet joint covers the membrane at the copper sheet except the part of feed portion covers black, and the line of rabbet joint is sinuous line structure for FPC antenna's return loss is less than - 10dB. Through above mode, the utility model discloses can realize little volume antenna to FPC antenna's return loss is less than - 10dB.

Description

A kind of FPC antenna

Technical field

The utility model relates to antenna technical field, particularly relates to a kind of FPC antenna.

Background technology

Wireless communication system is widely used in every field in recent years, and user can not be subject to distance limit, utilizes wireless communication system to carry out the transmission of information and information.And antenna is one of element important in wireless communication field, the size at present in order to respond electronic product reduces and the diversity of outward appearance, and soft antenna, because possessing flexible, that application elasticity is large feature, is extensively incorporated in various electronic installation.

Antenna, as the bridge of radio communication, is the key realizing radio communication.Along with the development of wireless communication technology and electronic technology, the wireless electronic product in daily life becomes more and more less, more and more thinner, and more and more gentlier, and function becomes from strength to strength.The miniaturization of antenna does not catch up with the paces of electronics miniaturization, often becomes the bottleneck of wireless electronic product volume-diminished.Theoretically, the operation wavelength of antenna is directly proportional to antenna size.Namely be want to reduce the size that the operating frequency of antenna will increase antenna, this difficult point with regard to making the miniaturization of antenna become research.

Utility model content

The utility model embodiment provides a kind of FPC antenna, can realize Antenna of small dimensions, and the return loss of FPC antenna is less than-10dB.

First aspect provides a kind of FPC antenna, it comprises medium substrate, copper sheet and black covering film, copper sheet is arranged in medium substrate, the current feed department that copper sheet is provided with the line of rabbet joint and is connected with the line of rabbet joint, at copper sheet except the part of current feed department covers black covering film, the line of rabbet joint is snake structure, makes the return loss of FPC antenna be less than-10dB.

Wherein, the line of rabbet joint comprises the first revers turn part, the second revers turn part, the 3rd revers turn part, the 4th revers turn part, the 5th revers turn part, the 6th revers turn part, the 7th revers turn part, the 8th revers turn part and the 9th revers turn part that connect successively, and the 9th revers turn part is connected with current feed department.

Wherein, first revers turn part is vertical with the second revers turn part, second revers turn part is vertical with the 3rd revers turn part, 3rd revers turn part is vertical with the 4th revers turn part, 4th revers turn part is vertical with the 5th revers turn part, and the 5th revers turn part is vertical with the 6th revers turn part, and the 6th revers turn part is vertical with the 7th revers turn part, 7th revers turn part is vertical with the 8th revers turn part, and the 8th revers turn part is vertical with the 9th revers turn part.

Wherein, line of rabbet joint width is 0.6mm, the length of the first revers turn part is 11mm, and the length of the second revers turn part is 8.1mm, and the length of the 3rd revers turn part is 21.8mm, the length of the 4th revers turn part is 1.3mm, the length of the 5th revers turn part is 7.1mm, and the length of the 6th revers turn part is 5.3mm, and the length of the 7th revers turn part is 30.1mm, the length of the 8th revers turn part is 8.1mm, and the length of the 9th revers turn part is 25.1mm.

Wherein, the shape of FPC antenna is rectangle, and the length of FPC antenna is 32.8mm, and the width of FPC antenna is 11.5mm.

Wherein, current feed department is connected by thimble with the circuit board that FPC antenna is mated.

Wherein, FPC antenna is fitted on housing.

Wherein, FPC antenna comprises first component and second component, and first component is vertical with second component to be arranged.

Wherein, the frequency of FPC antenna is 430MHz-440MHz.

Pass through such scheme, the beneficial effects of the utility model are: FPC antenna of the present utility model comprises medium substrate, copper sheet and black covering film, copper sheet is arranged in medium substrate, the current feed department that copper sheet is provided with the line of rabbet joint and is connected with the line of rabbet joint, at copper sheet except the part of current feed department covers black covering film, the line of rabbet joint is snake structure, can realize Antenna of small dimensions, and the return loss of FPC antenna is less than-10dB.

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.Wherein:

Fig. 1 is the structural representation of the FPC antenna of the utility model first embodiment;

Fig. 2 is the schematic diagram that the current feed department shown in Fig. 1 is connected with circuit board by thimble;

Fig. 3 is the schematic diagram that the FPC antenna shown in Fig. 1 is fitted on housing;

Fig. 4 is the structural representation of the FPC antenna of the utility model second embodiment.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under performing creative labour prerequisite, all belong to the scope of the utility model protection.

Shown in Figure 1, Fig. 1 is the structural representation of the FPC antenna of the utility model first embodiment.As shown in Figure 1, FPC (flexible PCB) antenna 10 that the present embodiment discloses comprises medium substrate (scheme depending on), copper sheet 11 and black covering film (figure does not look).Wherein, copper sheet 11 is arranged in medium substrate.In other embodiments, those skilled in the art can also utilize other metal material to replace copper sheet 11, such as gold.

The current feed department that copper sheet 11 is provided with the line of rabbet joint 12 and is connected with the line of rabbet joint 12, the line of rabbet joint 12 and current feed department 13 are all arranged in medium substrate 11, at copper sheet 11 except the part of current feed department 13 covers black covering film, namely current feed department 13 does not cover black covering film, and the line of rabbet joint 12 is in snake structure.

The FPC antenna 10 of the present embodiment adopts meander technology, to make electric current bend, effectively can extend the active path of electric current.Namely effectively extending current path when not changing the physical dimension of FPC antenna 10, reducing the resonance frequency of FPC antenna 10.The resonance frequency of FPC antenna 10 meets following formula:

$f=\frac{c}{2\sqrt{{\mathrm{\ϵ}}_r{\mathrm{\μ}}_r}}\sqrt{{\left(\frac{m}{L}\right)}^2+{\left(\frac{n}{W}\right)}^2}---\left(1\right)$

Wherein, c is the light velocity in vacuum; L is the length of FPC antenna 10; W is the width of FPC antenna 10; ε _rfor the relative dielectric constant of medium substrate 11; μ _rfor the magnetic conductive rate of medium substrate 11.

Known according to formula (1), the resonance frequency of FPC antenna 10 and the relative dielectric constant of medium substrate and magnetic conductive rate are inversely proportional to, and therefore medium substrate adopts the medium substrate of high-k (such as ceramic material or quartz etc.) or high magnetic permeability (as magnetic material) effectively can reduce the resonance frequency of FPC antenna 10; But adopt the medium substrate of high-k or high magnetic permeability, stronger surface wave can be motivated, it is a kind of loss power, add the surface loss of FPC antenna 10, the radiant power of FPC antenna 10 is caused to be far smaller than the input power of antenna, reduce the efficiency of FPC antenna 10, and cause FPC antenna 10 gain to decline.Reduce the loss caused by surface wave by the surface using black covering film to cover FPC antenna 10, and then improve the gain of FPC antenna 10.

Wherein, the snake structure of the line of rabbet joint 12 comprises the first revers turn part 121, second revers turn part 122, the 3rd revers turn part 123, the 4th revers turn part 124, the 5th revers turn part 125, the 6th revers turn part 126, the 7th revers turn part 127, the 8th revers turn part 128 and the 9th revers turn part 129 that connect successively, 9th revers turn part 129 is connected with current feed department 13, and the line of rabbet joint 12 has 8 corners.First revers turn part 123 is vertical with the second revers turn part 122, second revers turn part 122 is vertical with the 3rd revers turn part 123,3rd revers turn part 123 is vertical with the 4th revers turn part 124,4th revers turn part 124 is vertical with the 5th revers turn part 125,5th revers turn part 125 is vertical with the 6th revers turn part 126, and the 6th revers turn part 126 is vertical with the 7th revers turn part 127, and the 7th revers turn part 127 is vertical with the 8th inflection 128,8th revers turn part 128 is vertical with the 9th revers turn part 129, and namely the inflection angle of the line of rabbet joint 12 is 90 degree.In other embodiments of the present utility model, inflection angle can also be set to other angles by those of ordinary skill in the art, and such as inflection angle is 85 degree.

Preferably, the width of the line of rabbet joint 12 is 0.6mm, the length of the first revers turn part 121 is 11mm, and the length of the second revers turn part 122 is 8.1mm, and the length of the 3rd revers turn part 123 is 21.8mm, the length of the 4th revers turn part 124 is 1.3mm, the length of the 5th revers turn part 125 is 7.1mm, and the length of the 6th revers turn part 126 is 5.3mm, and the length of the 7th revers turn part 127 is 30.1mm, the length of the 8th revers turn part 128 is 8.1mm, and the length of the 9th revers turn part 129 is 25.1mm.

The shape of FPC antenna 10 is preferably rectangle, and namely the shape of copper sheet 11 is rectangle, and the length L of FPC antenna 10 is 32.8mm, and the width W of FPC antenna 10 is 11.5mm.In other embodiments of the present utility model, FPC antenna 10 can also be arranged to other shapes by those skilled in the art, such as square.

As shown in Figure 2, current feed department 13 is connected by thimble 14 with the circuit board 15 that FPC antenna 10 is mated, and realizes reception/emitting radio frequency signal to make circuit board 15 by thimble 14, current feed department 13 and FPC antenna 10.

As shown in Figure 3, FPC antenna 10 can also be fitted on housing 16.Wherein, housing 16 comprises sidepiece 161 and bottom 162, and FPC antenna 10 comprises first component 101 and second component 102, first component 101 is vertical with second component 102 to be arranged, first component 101 is fitted on bottom 162, and second component 102 is fitted on sidepiece 161, and namely FPC antenna 10 is collapsible.

When the material of housing 16 is determined, if when changing material or the size of housing 16, the performance of FPC antenna 10 also can change, such as relative dielectric constant increases, the resonance frequency of corresponding FPC antenna 10 reduces, can adjust short by the end of FPC antenna 10, to make the path of effective current shorten, and then the resonance frequency of FPC antenna 10 raises.

In addition, as shown in Figure 4, FPC antenna 10 needs lower-left end and bottom righthand side to be all arranged to radian according to practical application, and wherein L1 is 12.4mm, L2 be 10.2mm, W1 is 1mm.

In impedance bandwidth, the return loss requirement of FPC antenna is less than-10dB, the present embodiment disclose FPC antenna 10 return loss can reach-20dB to-30dB.

The present embodiment disclose FPC antenna 10 frequency be 430MHz-440MHz, the frequency of FPC antenna 10 is preferably 433MHz.

In sum, FPC antenna of the present utility model comprises medium substrate, copper sheet and black covering film, copper sheet is arranged in medium substrate, the current feed department that copper sheet is provided with the line of rabbet joint and is connected with the line of rabbet joint, at copper sheet except the part of current feed department covers black covering film, the line of rabbet joint is snake structure, can realize Antenna of small dimensions, and the return loss of FPC antenna is less than-10dB.

The foregoing is only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.

Claims (9)

1. a FPC antenna, it is characterized in that, described FPC antenna comprises medium substrate, copper sheet and black covering film, described copper sheet is arranged in described medium substrate, the current feed department that described copper sheet is provided with the line of rabbet joint and is connected with the described line of rabbet joint, at described copper sheet except the part of described current feed department covers described black covering film, the described line of rabbet joint is snake structure, makes the return loss of described FPC antenna be less than-10dB.

2. FPC antenna according to claim 1, it is characterized in that, the described line of rabbet joint comprises the first revers turn part, the second revers turn part, the 3rd revers turn part, the 4th revers turn part, the 5th revers turn part, the 6th revers turn part, the 7th revers turn part, the 8th revers turn part and the 9th revers turn part that connect successively, and described 9th revers turn part is connected with described current feed department.

3. FPC antenna according to claim 2, it is characterized in that, described first revers turn part is vertical with described second revers turn part, described second revers turn part is vertical with described 3rd revers turn part, described 3rd revers turn part is vertical with described 4th revers turn part, described 4th revers turn part is vertical with described 5th revers turn part, described 5th revers turn part is vertical with described 6th revers turn part, described 6th revers turn part is vertical with described 7th revers turn part, described 7th revers turn part is vertical with described 8th revers turn part, and described 8th revers turn part is vertical with described 9th revers turn part.

4. FPC antenna according to claim 3, it is characterized in that, described line of rabbet joint width is 0.6mm, the length of described first revers turn part is 11mm, the length of described second revers turn part is 8.1mm, the length of described 3rd revers turn part is 21.8mm, the length of described 4th revers turn part is 1.3mm, the length of described 5th revers turn part is 7.1mm, the length of described 6th revers turn part is 5.3mm, the length of described 7th revers turn part is 30.1mm, and the length of described 8th revers turn part is 8.1mm, and the length of described 9th revers turn part is 25.1mm.

5. FPC antenna according to claim 4, is characterized in that, the shape of described FPC antenna is rectangle, and the length of described FPC antenna is 32.8mm, and the width of described FPC antenna is 11.5mm.

6. the FPC antenna according to claim 1-5 any one, is characterized in that, described current feed department is connected by thimble with the circuit board that described FPC antenna is mated.

7. the FPC antenna according to claim 1-5 any one, is characterized in that, described FPC antenna is fitted on housing.

8. FPC antenna according to claim 7, is characterized in that, described FPC antenna comprises first component and second component, and described first component is vertical with described second component to be arranged.

9. FPC antenna according to claim 1, is characterized in that, the frequency of described FPC antenna is 430MHz-440MHz.