CN201700125U - Data card-used mobile terminal and shielding case thereof - Google Patents

Abstract

The utility model discloses a data card-used mobile terminal and a shielding case thereof. The outer surface of the shielding case of the data card-used mobile terminal is provided with a trough line, so the flow path of the current on the outer surface of the shielding case can be damaged, and the magnetic densities of different currents on the near field can mutually offset, thereby the peak value of SAR value can be greatly decreased.

Description

Data card class portable terminal and radome thereof

Technical field

The utility model relates to the portable terminal technology, in particular to a kind of data card class portable terminal and radome thereof.

Background technology

Along with the development of wireless technology, become more and more popular by the wireless Modem online, particularly data card class portable terminal has the advantage that can surf the Net easy to carry whenever and wherever possible.But data card class portable terminal tends to be close to human body and places, and its electromagnetic radiation may damage human body.(Specific Absorption Rate SAR) assesses the influence of electromagnetic radiation to human body generally to adopt specific absorption rate in the world.At present, more and more higher to the requirement of data card SAR value, it has become an important indicator weighing performance.Studies show that, the SAR value is that the uneven feed by antenna causes, find through experiment, the maximum point of SAR value is not generally at antenna area, because be subjected to for example influence of notebook computer of terminal equipment of installation data card class portable terminal, the focus of SAR value often is positioned on the radome at antenna rear.

Reducing the antenna SAR value does not at present also have method preferably, and conventional method is to reduce the conducted power of terminal, or pastes absorbing material and copper-surfaced skin on radome, and these methods all can bring aerial radiation power to reduce largely.

Summary of the invention

Main purpose of the present utility model is to provide a kind of data card class portable terminal and radome thereof, to address the above problem at least.

According to an aspect of the present utility model, a kind of radome of data card class portable terminal is provided, offer the line of rabbet joint on the outer surface of this radome.

According on the other hand of the present utility model, provide on a kind of outer surface of radome and offered the line of rabbet joint, comprising: radome, offer the line of rabbet joint on the outer surface of this radome.

By the utility model, employing is offered the line of rabbet joint on the outer surface of the radome of data card class portable terminal, destroys the unsymmetrical current that produces SAR value problem, and then reaches the effect that reduces the antenna SAR value.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:

Fig. 1 is the floor map according to the data card class portable terminal of the utility model embodiment;

Fig. 2 is according to the cross bath radome surface current flow path schematic diagram of offering of the present utility model;

Fig. 3 is the SAR test macro schematic diagram according to the utility model embodiment;

Fig. 4 is the SAR focus distribution map according to the utility model embodiment;

Fig. 5 is the arbitrary shape line of rabbet joint decomposing schematic representation according to the utility model embodiment.

Embodiment

Hereinafter will describe the utility model with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.

According to embodiment of the present utility model, a kind of radome of data card class portable terminal is provided, offer the line of rabbet joint on the outer surface of this radome.

Find that by analysis the monopole antenna of data card class portable terminal is uneven feed structure, the electric current above antenna, some current direction the conducting medium at antenna below or rear, this is the main cause that causes SAR too high.

The most of zone of the conducting medium at antenna below or rear is the radome of data card class portable terminal, offer the line of rabbet joint by outer surface at radome, flow path that can break current, make the electric current on the radome wriggle mobile, particularly the sense of current of the line of rabbet joint both sides in cut-off current path is just opposite, they can be offset in the magnetic field intensity near field, thereby make that the peak value of SAR value can be reduced significantly.

In implementation process, the above-mentioned line of rabbet joint can be for breaking the arbitrary shape of the unsymmetrical current of ring on the radome, cross for example, and Y font or T font preferably, below are introduced the radome according to card class portable terminal that the utility model provides with the cross line of rabbet joint.

Fig. 1 is that as shown in Figure 1, main antenna is positioned at the end of data card according to the floor map of the data card class portable terminal of the utility model embodiment, and diversity antenna is positioned at a side of card, and except the headroom district of antenna, other parts are the zone of radome.The USB swivel head is positioned at the other end of data card.During the data card operate as normal, main antenna transmitting power and received power, diversity antenna is only as reception antenna.

As shown in Figure 1, the surface of radome has cross bath.In order to reduce the SAR value of antenna, measure the SAR value distribution map of this face by the SAR measuring system, determine the hotspot location of SAR value, find the relevant position on the radome.With this regional center is initial point, perpendicular to the direction of current flow slotted line, does the line of rabbet joint perpendicular to the above-mentioned line of rabbet joint from this line of rabbet joint mid point then.When unsymmetrical current is flowed through the line of rabbet joint, can be blocked by the line of rabbet joint, these direction of current flow are different, and the near field mutual superposition that is produced is offset, and can disperse SAR value energy, must bring reducing of SAR value.

Fig. 2 is according to the cross bath radome surface current flow path schematic diagram of offering of the present utility model, offers the principle that the cross line of rabbet joint can reduce the SAR value below in conjunction with Fig. 2 concrete analysis on the surface of shielding trench.

As shown in Figure 2, the electric current of level trough both sides is made up of a plurality of little current element, gets the current element I of a certain section line of rabbet joint both sides ₁And I ₂, then according to the basic theories of short electrical dipole field, in the ideal case, these two current element are similar to anti-phase, and two fields that current element produced are as follows:

Current element I ₁The electromagnetic field that is produced is:

$E_{r1}=\frac{I_{1}L\cos \mathrm{\θ}{e}^{\mathrm{j\ω}[t-(r/c)]}}{2\mathrm{\π}{\mathrm{\ϵ}}_0}(\frac{1}{{\mathrm{cr}}^2}+\frac{1}{\mathrm{j\ω}{r}^3});$

$E_{\mathrm{\θ}1}=\frac{I_{1}L\sin \mathrm{\θ}{e}^{\mathrm{j\ω}[t-(r/c)]}}{4\mathrm{\π}{\mathrm{\ϵ}}_0}(\frac{\mathrm{j\ω}}{c^{2}r}+\frac{1}{{\mathrm{cr}}^2}+\frac{1}{j{\mathrm{\ωr}}^3});$

${\left|H\right|}_1=H_{\mathrm{\φ}1}=\frac{I_{1}L\sin \mathrm{\θ}{e}^{\mathrm{j\ω}[t-(r/c)]}}{4\mathrm{\π}}(\frac{\mathrm{j\ω}}{\mathrm{cr}}+\frac{1}{r^2});$

H _r1＝H _θ1＝0

Current element I ₂The electromagnetic field that is produced is:

$E_{r2}=\frac{I_2\mathrm{Lcis\θ}{e}^{\mathrm{j\ω}[t-(r/c)]}}{2\mathrm{\π}{\mathrm{\ϵ}}_0}(\frac{1}{{\mathrm{cr}}^2}+\frac{1}{{\mathrm{j\ωr}}^3})$

$E_{\mathrm{\θ}2}=\frac{I_{2}L\sin \mathrm{\θ}{e}^{\mathrm{j\ω}[t-(r/c)]}}{4\mathrm{\π}{\mathrm{\ϵ}}_0}(\frac{\mathrm{j\ω}}{c^{2}r}+\frac{1}{{\mathrm{cr}}^2}+\frac{1}{{\mathrm{j\ωr}}^3})$

${\left|H\right|}_2=H_{\mathrm{\φ}2}=\frac{I_{2}L\sin \mathrm{\θ}{e}^{\mathrm{j\ω}[t-(r/c)]}}{4\mathrm{\π}}(\frac{\mathrm{j\ω}}{\mathrm{cr}}+\frac{1}{r^2})$

H _r2＝H _θ2＝0

By current element I ₁And I ₂The electromagnetic field that is produced is superposed to

$E_r=\frac{(I_1-I_2)L\cos \mathrm{\θ}{e}^{\mathrm{j\ω}[t-(r/c)]}}{2\mathrm{\π}{\mathrm{\ϵ}}_0}(\frac{1}{{\mathrm{cr}}^2}+\frac{1}{\mathrm{j\ω}{r}^3})$

$E_{\mathrm{\θ}}=\frac{(I_1-I_2)L\sin \mathrm{\θ}{e}^{\mathrm{j\ω}[t-(r/c)]}}{4\mathrm{\π}{\mathrm{\ϵ}}_0}(\frac{\mathrm{j\ω}}{c^{2}r}+\frac{1}{{\mathrm{cr}}^2}+\frac{1}{j{\mathrm{\ωr}}^3})$

$\left|H\right|=H_{\mathrm{\φ}}=\frac{(I_1-I_2)L\sin \mathrm{\θ}{e}^{\mathrm{j\ω}[t-(r/c)]}}{4\mathrm{\π}}(\frac{\mathrm{j\ω}}{\mathrm{cr}}+\frac{1}{r^2})$

H _r＝H _θ＝0

By above-mentioned analysis as can be seen, work as I ₁And I ₂In the time of oppositely, I ₁And I ₂The field intensity that is produced can be cancelled out each other, thereby reduces SAR value, when two current element equivalent reverse, i.e. I ₁=-I ₂The time, E _r=E _θ=H _φ=H _r=H _θ=0.This moment is minimum by the field that unsymmetrical current produced, and the SAR value obtains reducing.

In order to determine the particular location of fluting, need to determine the SAR value distribution situation on radome surface, in implementation process, can but be not limited to obtain SAR value distribution map by the SAR test system and test, Fig. 3 is the SAR test macro schematic diagram according to the utility model embodiment.The method that obtains SAR value distribution map by the SAR test system and test is as follows: the data card portable terminal inserts notebook computer by the USB mouth, and computer is fixed on SAR test macro tissue fluid bottom land, and keeping identity distance to be measured is 5mm from bottom land.Move the SAR test macro, obtain the SAR value distribution map of this face, as shown in Figure 4, the position of Fig. 4 central point is the peak of SAR value.By contrast SAR value distribution map and data card itself, on radome, determined the relevant position.

In implementation process, after the position of determining SAR value peak value, can determine concrete mode of grooving according to the position of SAR value peak value on the radome, concrete grooving method is the center for the position with SAR value peak value, opens the orthogonal line of rabbet joint that two width are 0.2mm-0.5mm.Wherein, the length of every line of rabbet joint is (λ is the electromagnetic wavelength that portable terminal sends) between λ/50-λ/20, to guarantee not influence the shield effectiveness of radome.Thereby destroyed the flow path of electric current on the shielding trench, make the electric current on the shielding trench wriggle mobile, particularly the sense of current of the line of rabbet joint both sides in cut-off current path is just opposite, and they are just offset in the magnetic field intensity near field, and the peak value of SAR value can be reduced significantly.

In implementation process, preferably, also can on the outer surface of the radome of slotting, add one deck absorbing material, thereby further reduce the SAR value.

Need to prove that above-mentioned cross bath is the mode of grooving that a kind of ratio is easier to realize, as shown in Figure 5.Any combination that line can resolve into horizontal line and vertical line on the radome outer surface, therefore, the line of rabbet joint on the radome that the utility model embodiment provides is not limited in the cross line of rabbet joint, also comprise arbitrarily to fall the line of rabbet joint form that SAR is a purpose, for example line of rabbet joint form such as Y font or T font.

According to the utility model embodiment, a kind of data card class portable terminal also is provided, this data card class portable terminal comprises radome, offers the line of rabbet joint on the outer surface of this radome.

Preferably, the center of the line of rabbet joint is positioned at the specific absorption rate SAR peak of radome on the radome of this data card class portable terminal.

Preferably, on the radome of this data card class portable terminal the line of rabbet joint be shaped as cross, comprise the orthogonal two strip line of rabbet joint.

Preferably, the groove width of above-mentioned pilot trench line is between 0.2mm to 0.5mm.

Preferably, the length of above-mentioned pilot trench line is between λ/50-λ/20, and wherein, λ is the electromagnetic wavelength that portable terminal sends.

Preferably, post absorbing material on the outer surface of the radome of this data card class portable terminal.

As can be seen from the above description, the utility model adopts on the outer surface of the radome of data card class portable terminal and offers the line of rabbet joint, destroys the unsymmetrical current that produces SAR value problem, and then reaches the effect that reduces the antenna SAR value.

The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.

Claims (12)

1. the radome of a data card class portable terminal is characterized in that, offers the line of rabbet joint on the outer surface of described radome.

2. radome according to claim 1 is characterized in that, the center of the described line of rabbet joint is positioned at the specific absorption rate SAR peak of the radome of not offering the line of rabbet joint.

3. radome according to claim 1 is characterized in that, the described line of rabbet joint be shaped as cross, comprise the orthogonal two strip line of rabbet joint.

4. radome according to claim 3 is characterized in that the groove width of described pilot trench line is between 0.2mm to 0.5mm.

5. radome according to claim 3 is characterized in that, the length of described pilot trench line is between λ/50-λ/20, and wherein, described λ is the electromagnetic wavelength that described portable terminal sends.

6. according to each described radome of claim 1 to 5, it is characterized in that, post absorbing material on the outer surface of described radome.

7. a data card class portable terminal is characterized in that, comprises radome, offers the line of rabbet joint on the outer surface of described radome.

8. data card class portable terminal according to claim 7 is characterized in that, the center of the described line of rabbet joint is positioned at the specific absorption rate SAR peak of the radome of not offering the line of rabbet joint.

9. data card class portable terminal according to claim 7 is characterized in that, the described line of rabbet joint be shaped as cross, comprise the orthogonal two strip line of rabbet joint.

10. data card class portable terminal according to claim 9 is characterized in that the groove width of described pilot trench line is between 0.2mm to 0.5mm.

11. data card class portable terminal according to claim 9 is characterized in that, the length of described pilot trench line is between λ/50-λ/20, and wherein, described λ is the electromagnetic wavelength that described portable terminal sends.

12. according to each described data card class portable terminal of claim 7 to 9, it is characterized in that, post absorbing material on the outer surface of described radome.

Images