CN202183791U - Antenna circuit of mobile terminal - Google Patents
Antenna circuit of mobile terminal Download PDFInfo
- Publication number
- CN202183791U CN202183791U CN2011202609213U CN201120260921U CN202183791U CN 202183791 U CN202183791 U CN 202183791U CN 2011202609213 U CN2011202609213 U CN 2011202609213U CN 201120260921 U CN201120260921 U CN 201120260921U CN 202183791 U CN202183791 U CN 202183791U
- Authority
- CN
- China
- Prior art keywords
- antenna
- radio
- tvs pipe
- portable terminal
- frequency input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses an antenna circuit of a mobile terminal. The mobile terminal comprises an antenna radiation body and a PCB (Printed Circuit Board), the PCB is provided with a radio-frequency chip, a grounded point, an antenna radio-frequency input signal feed point and an ESD (Electro-static Discharge) device, wherein the antenna radiation body is electrically connected with the antenna radio-frequency input signal feed point and the grounded point respectively, one end of the ESD device is grounded, and the other end of the ESD device is electrically connected with the radio-frequency chip and the antenna radio-frequency input signal feed point respectively. In the antenna circuit of the mobile terminal, one ESD device is arranged between the radio-frequency chip and the antenna radio-frequency input signal feed point, and the static electricity is effectively introduced into the ground of the PCB circuit board when an antenna of a mobile phone bears static interference, therefore, a static electricity protection function is exerted, and the antenna performance of the mobile phone is effectively ensured.
Description
Technical field
The utility model relates to the antistatic design of portable terminal device, particularly a kind of antenna circuit of portable terminal.
Background technology
Nowadays, the function of mobile phone is abundant day by day, but the volume of mobile phone is more and more lighter and handier, compact.People pursue cell-phone function abundant with compact conformation in, antenna for mobile phone has but received external dimensions and has limited with the inner space.In order effectively to enlarge antenna volume, antenna for mobile phone often is exposed to below the battery of mobile phone face-piece, the zone that back cover is above, and this Antenna Design is for many low costs but the radio frequency chip of antistatic effect difference has brought great challenge.
At present; The electrostatic designs circuit of mobile phone 2G/3G antenna has only been considered the influence that electric capacity brings; And do not consider of the thresholding effect of the clamp voltage of antistatic device to radiofrequency signal, and make antenna for mobile phone still receive the interference of static easily, the performance of antenna is affected easily.
Summary of the invention
In view of the weak point of above-mentioned prior art, the purpose of the utility model is to provide a kind of antenna circuit of portable terminal, to solve the problem that the prior art antenna for mobile phone is subject to electrostatic interference.
In order to achieve the above object, the utility model has been taked following technical scheme:
A kind of antenna circuit of portable terminal; Said portable terminal comprises antenna radiator and PCB circuit board; Wherein, said PCB circuit board is provided with radio frequency chip, earth point, antenna radio-frequency input signals load point and ESD device, and said antenna radiator is electrically connected with said antenna radio-frequency input signals load point and earth point respectively; One end ground connection of said ESD device, the other end are electrically connected with radio frequency chip and antenna radio-frequency input signals load point respectively.
The antenna circuit of described portable terminal, wherein, the ESD device is the TVS pipe.
The antenna circuit of described portable terminal, wherein, the equivalent capacity of said TVS pipe is less than 0.5pF.
The antenna circuit of described portable terminal, wherein, said TVS pipe adopts paster TVS pipe.
The antenna circuit of described portable terminal, wherein, antenna radio-frequency input signals load point to the distance of ESD device less than the distance of ESD device to radio frequency chip.
Compared to prior art; The antenna circuit of the portable terminal that the utility model provides; Adopted between radio frequency chip and antenna radio-frequency input signals load point an ESD device has been set, made when antenna for mobile phone receives electrostatic interference, static has been imported to effectively in the ground of PCB circuit board; Promptly play the electrostatic defending effect, guaranteed the antenna performance of mobile phone again effectively.
The antenna circuit of the portable terminal that the utility model provides has promptly been considered the influence that electric capacity brings; Considered of the thresholding effect of the clamp voltage of electrostatic devices again to radiofrequency signal; Therefore the utility model has also been realized antenna link is protected, and reduces the restriction of antenna to structure.
Description of drawings
Fig. 1 is the structured flowchart of the antenna circuit of the utility model portable terminal.
Fig. 2 makes the oscillogram of the reaction time for the utility model TVS plumber.
Embodiment
The utility model provides a kind of antenna circuit of portable terminal, through between antenna radio-frequency input signals load point and radio frequency chip, increasing electrostatic protection element, solves antenna link to the electrostatic problem between the radio frequency chip.
For the purpose, technical scheme and the effect that make the utility model is clearer, clear and definite, below develop simultaneously embodiment to the utility model further explain with reference to accompanying drawing.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The antenna circuit of the portable terminal that the utility model embodiment provides; See also Fig. 1; Described portable terminal is preferably mobile phone, and it comprises antenna radiator 1 and PCB circuit board 2, and said PCB circuit board 2 is provided with radio frequency chip 3, earth point 11, antenna radio-frequency input signals load point 12 and ESD (Electro-Static discharge; Static discharges) device 4; Said antenna radiator 1 is electrically connected with earth point 11 with said antenna radio-frequency input signals load point 12 respectively, an end ground connection of said ESD device 4, and the other end is electrically connected with radio frequency chip 3 and antenna radio-frequency input signals load point 12 respectively.When antenna for mobile phone receives electrostatic interference, static is imported to effectively in the ground of PCB circuit board 2, promptly played the electrostatic defending effect, effectively guaranteed the transmit power needs of radio-frequency antenna again.
Among the utility model embodiment; Said ESD device is TVS pipe (Transient Voltage Suppressor; Transient Voltage Suppressor), when electrostatic pulse arrives 1 last time of antenna radiator, the TVS pipe can be with the response time (subnanosecond level) that is exceedingly fast; The high impedance at antenna radiator two ends is become Low ESR; To absorb an instantaneous large-current, the voltage clamp of managing TVS two interpolars is on a predetermined numerical value, thereby the circuit element of protection its rear end does not receive the impact of high voltage transient spike.
Because common electrostatic protection element can not satisfy the demand of radio-frequency emission power and static simultaneously, therefore, the utility model needs to consider how to select suitable TVS pipe from antenna performance and TVS pipe performance parameter two aspects.
One, antenna performance is to the requirement of TVS pipe:
1, under the ideal situation, the equivalence appearance value of TVS pipe is more little, and its influence to antenna is more little.Among the utility model embodiment, the equivalent capacity of TVS pipe is designed to less than 0.5pF, thereby can revise the influence that electric capacity brings through the size or the match circuit of adjustment antenna.
2, when operating handset during in the GSM900/GSM850/DCS1800/PCS1900 frequency range, its maximum transmission power is 33dBm, according to formula: 10lgP/1mW=33dBm, can draw P=2W.The mobile phone radio frequency chip is 50 ohm to the circuit impedance between the antenna at present, according to Ohm's law: P=U
2/ R, the average voltage that can calculate on the antenna link is 10V.Its corresponding crest voltage is that (its computing formula is 14.14V: Ui
2=U
2/ 2).When the clamp voltage of TVS pipe during less than the voltage of radio frequency transmit signal, the mobile phone transmitting power can receive corresponding reduction, when therefore in the antenna for mobile phone link, increasing the TVS pipe, should select the TVS pipe of operational voltage value greater than the voltage of radio frequency transmit signal.
Two, the action effect of TVS sees also Fig. 2, and ordinate is represented electrostatic induced current size I
PP, abscissa is represented the reaction time.Can know that from figure after static took place, through 30ns, it is original 60% that its electric current drops to, and drops to 30% after the 60ns, visible its action time is very fast.For selecting suitable TVS, we need consider following parameter.
V
RBe the working inverse voltage of TVS pipe, promptly TVS manages the maximum working voltage of the circuit that inserts.In the present embodiment, V
RShould be not less than the maximum voltage of circuit ability operate as normal, otherwise the leakage current of TVS pipe will increase.
V
BrBe the reverse breakdown voltage of TVS pipe, promptly can cause the TVS pipe that the voltage of avalanche breakdown takes place.This voltage must be higher than the ceiling voltage that circuit can operate as normal, otherwise the TVS pipe will puncture by circuit voltage, causes the circuit cisco unity malfunction.
V
CBe the clamping voltage of TVS pipe, promptly the TVS pipe is added in the voltage between its two ends after breakdown, and this voltage must be lower than the ceiling voltage that circuit can bear, otherwise circuit can damage by high voltage, this means that the TVS pipe does not play effect.
C
dBe the equivalent capacity of TVS pipe, the appearance value of this electric capacity must be selected according to the speed of the signal of being protected, if excessive, can cause signal integrity to be destroyed, and the equivalent capacitance value of the high more selected TVS pipe of signal rate should be more little.
P
PPBe the peak power of TVS pipe, be the product of peak current and clamping voltage.This value is big more, and the ability that the esd pulse that expression TVS pipe can bear impacts is strong more.
I
RBe the leakage current of TVS pipe, when promptly the TVS pipe is not worked, flow through electric current wherein in place in circuit, because this electric current can directly influence Overall Power Consumption, so it is more little good more.
Rd is the dynamic electric resistor of TVS pipe, and this more parameters is little good more, because V
C=V
BR+ I * rd, so it is more little, clamping voltage V
CMore little.
Manage the consideration of above-mentioned performance based on TVS, the utility model when selecting the TVS pipe, its equivalent capacity C
d<0.5pF; Working inverse voltage V
R>15V; Reverse breakdown voltage V
Br, clamping voltage V
cMore little good more (and V
c>V
Br>V
R); The peak power PPP value of TVS pipe is the bigger the better leakage current I
R, dynamic electric resistor rd is more little good more.In the present embodiment, said TVS pipe adopts paster TVS pipe, and its electronics material specification is 0402 to make the layout of PCB circuit board simple.
In order better to realize its effect; When the PCB layout, need satisfy: TVS pipe near the antenna radio-frequency input signals load point on the PCB circuit board (antenna radio-frequency input signals load point to the distance of ESD device less than the distance of ESD device to radio frequency chip), makes its delivery pathways short as far as possible as far as possible; And TVS pipe ground connection is functional, and path is unblocked over the ground to guarantee it, and with better release electrostatic, under the situation that does not influence antenna performance, the utility model increases the TVS pipe trace width of end over the ground for this reason.
In sum; The antenna circuit of the portable terminal that the utility model provides; Adopted between radio frequency chip and antenna radio-frequency input signals load point an ESD device has been set, made when antenna for mobile phone receives electrostatic interference, static has been imported to effectively in the ground of PCB circuit board; Promptly play the electrostatic defending effect, guaranteed the antenna performance of mobile phone again effectively.
The antenna circuit of the portable terminal that the utility model provides has promptly been considered the influence that electric capacity brings; Considered of the thresholding effect of the clamp voltage of electrostatic devices again to radiofrequency signal; Therefore the utility model has also been realized antenna link is protected, and reduces the restriction of antenna to structure.
Simultaneously, so the TVS pipe encapsulation little (component specification is 0402) that the utility model increased is also fairly simple concerning the layout of PCB circuit board.
It is understandable that; Concerning those of ordinary skills; Can be equal to replacement or change according to the technical scheme and the utility model design thereof of the utility model, and all these changes or replacement all should belong to the protection range of the appended claim of the utility model.
Claims (5)
1. the antenna circuit of a portable terminal; Said portable terminal comprises antenna radiator and PCB circuit board; It is characterized in that said PCB circuit board is provided with radio frequency chip, earth point, antenna radio-frequency input signals load point and ESD device, said antenna radiator is electrically connected with said antenna radio-frequency input signals load point and earth point respectively; One end ground connection of said ESD device, the other end are electrically connected with radio frequency chip and antenna radio-frequency input signals load point respectively.
2. the antenna circuit of portable terminal according to claim 1 is characterized in that, the ESD device is the TVS pipe.
3. the antenna circuit of portable terminal according to claim 2 is characterized in that, the equivalent capacity of said TVS pipe is less than 0.5pF.
4. according to the antenna circuit of claim 2 or 3 described portable terminals, it is characterized in that said TVS pipe adopts paster TVS pipe.
5. the antenna circuit of portable terminal according to claim 1 is characterized in that, antenna radio-frequency input signals load point to the distance of ESD device less than the distance of ESD device to radio frequency chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202609213U CN202183791U (en) | 2011-07-22 | 2011-07-22 | Antenna circuit of mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202609213U CN202183791U (en) | 2011-07-22 | 2011-07-22 | Antenna circuit of mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202183791U true CN202183791U (en) | 2012-04-04 |
Family
ID=46176811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202609213U Expired - Fee Related CN202183791U (en) | 2011-07-22 | 2011-07-22 | Antenna circuit of mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202183791U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716428A (en) * | 2015-03-13 | 2015-06-17 | 惠州Tcl移动通信有限公司 | Antenna bandwidth expansion device and mobile terminal |
| CN106533491A (en) * | 2016-10-20 | 2017-03-22 | 捷开通讯(深圳)有限公司 | Radio frequency module and mobile terminal for improving wireless signal intensity |
| CN108076598A (en) * | 2016-11-14 | 2018-05-25 | 英业达科技有限公司 | Electronic device |
| TWI774259B (en) * | 2021-03-08 | 2022-08-11 | 啟碁科技股份有限公司 | Electronic device and antenna feeding device |
-
2011
- 2011-07-22 CN CN2011202609213U patent/CN202183791U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716428A (en) * | 2015-03-13 | 2015-06-17 | 惠州Tcl移动通信有限公司 | Antenna bandwidth expansion device and mobile terminal |
| CN104716428B (en) * | 2015-03-13 | 2017-11-10 | 惠州Tcl移动通信有限公司 | A kind of beamwidth of antenna expanding unit and mobile terminal |
| CN106533491A (en) * | 2016-10-20 | 2017-03-22 | 捷开通讯(深圳)有限公司 | Radio frequency module and mobile terminal for improving wireless signal intensity |
| CN108076598A (en) * | 2016-11-14 | 2018-05-25 | 英业达科技有限公司 | Electronic device |
| TWI774259B (en) * | 2021-03-08 | 2022-08-11 | 啟碁科技股份有限公司 | Electronic device and antenna feeding device |
| US11916286B2 (en) | 2021-03-08 | 2024-02-27 | Wistron Neweb Corporation | Electronic device and antenna feeding device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120404 Termination date: 20130722 |