CN102497725A - Circuit board capable of reducing antenna electromagnetic interference - Google Patents
Circuit board capable of reducing antenna electromagnetic interference Download PDFInfo
- Publication number
- CN102497725A CN102497725A CN201110378149XA CN201110378149A CN102497725A CN 102497725 A CN102497725 A CN 102497725A CN 201110378149X A CN201110378149X A CN 201110378149XA CN 201110378149 A CN201110378149 A CN 201110378149A CN 102497725 A CN102497725 A CN 102497725A
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- CN
- China
- Prior art keywords
- circuit board
- antenna
- interference source
- electromagnetic interference
- inductance
- 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.)
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Abstract
The invention provides a circuit board capable of reducing antenna electromagnetic interference. An antenna and an interference source are arranged on the circuit board. The interference source is connected to the circuit board through a stitch. An inductor is connected between the stitch and ground of the circuit board. By using the circuit board of the invention, the electromagnetic interference generated by the interference source around the antenna to the antenna can be reduced.
Description
Technical field
The present invention relates to a kind of circuit board that reduces the antenna electromagnetic interference, particularly a kind of reduction is installed on the circuit board of the peripheral element of the antenna on the circuit board to the electromagnetic interference of antenna generation.
Background technology
Because it is compact that portable electron device (like mobile phone) is now stressed; So it is tightr, general that inner each element of electronic installation all discharges, and can place elements such as camera lens or earphone jack near the antenna of mobile phone; These element-external all have interference source to center on; And when antenna and interference source resonance frequency are close, then cause easily to interfere with each other, and cause the reduction of aerial radiation usefulness.
Summary of the invention
In view of this, so a kind of circuit board that reduces the antenna electromagnetic interference need be provided, can reduce of the sky magnetic disturbance of the peripheral element of the antenna of installing on the circuit board to the antenna generation.
One antenna and an interference source are set on the circuit board of this reduction antenna electromagnetic interference, and this interference source is connected to circuit board through a stitch, between the ground of this stitch and circuit board, is connected an inductance.
Compared to prior art, the present invention is through being connected an inductance between the peripheral interference source of antenna and the circuit board that this antenna and peripheral interference source are installed, to reduce the electromagnetic interference of peripheral interference source to the antenna generation.
Description of drawings
Fig. 1 is the sketch map that is installed on the circuit board in the electronic installation in an embodiment of the present invention.
When Fig. 2 does not connect inductance for the interference source on the circuit board, the reflection loss figure of gps antenna.
When Fig. 3 connects an inductance for interference source on the circuit board shown in Figure 1, the reflection loss figure of gps antenna.
The main element symbol description
| |
1 |
| |
10 |
| |
11 |
| Stitch | 101 |
| |
13 |
| |
12 |
| |
21 |
| The second place | 22 |
| The |
23 |
| The 4th position | 31 |
Following embodiment will combine above-mentioned accompanying drawing to further specify the present invention.
Embodiment
As shown in Figure 1, an antenna 11 and an interference source 10 are set on the circuit board 1 in being installed on an electronic installation.The resonance frequency of the resonance frequency of this interference source 10 and this antenna 11 is more approaching.This interference source 10 is connected to circuit board 1 through a stitch 101.Between the ground 13 of this stitch 101 and circuit board, be connected an inductance 12.Connect the resonance frequency length that this inductance 12 can prolong interference source 10, the resonance frequency of interference source 10 and antenna 11 is staggered, thereby reduce the electromagnetic interference of 10 pairs of antennas 11 of interference source, make antenna 11 usefulness recover normal.In this execution mode, this interference source 10 is for being covered in the metallic object near the element of this antenna 11.
In this execution mode, this antenna 11 is a gps antenna, and its frequency range that receives signal is 1.575GHz, the value of this inductance 12 at 12nH between the 82nH.The size of this inductance 12 is according to the interfering frequency decision of interference source 10; If the frequency ratio of the interfering frequency of interference source 10 and antenna 11 is more approaching; Then can select an inductance 12 that big inductance value is arranged; If the interfering frequency of interference source 10 and the frequency of antenna 11 differ bigger, then can select an inductance 12 that less inductance value is arranged.
As shown in Figure 2, the reflection loss figure of the gps antenna when on circuit board 1, not inserting inductance 12.Transverse axis among the figure is the frequency of signal, and the longitudinal axis is the loss value of signal, and under the normal condition, GPS need resonate in the second place 22, and promptly frequency is in the position of 1.575GHz, yet causes resonance shift to primary importance because interference source 10 disturbs, i.e. 1.4206GHz.The frequency response of being resonated for interference source 10 between the second place 22 and the 3rd position 23.
As shown in Figure 3, the reflection loss figure of the gps antenna during for access inductance 12 on circuit board 1.Transverse axis among the figure is the frequency of signal, and the longitudinal axis is the loss value of signal, and 31 places, the 4th position are that the frequency range 1.575GHZ place of gps antenna produces resonance place.It is thus clear that after having added inductance 12, resonance place of signal returns to the frequency range 1.575GHZ place of GPS.
In addition; As shown in Figure 2, when not adding inductance 12, signal resonance place is that primary importance 21 pairing loss of signal values are-15.408; And after adding inductance 12; Signal resonance place i.e. the 4th position 31 corresponding loss of signal values is reduced to-25.902DB, and visible, signal radiation efficient has also obtained significant raising.
Claims (4)
1. a circuit board that reduces the antenna electromagnetic interference is provided with an antenna and an interference source on this circuit board, and this interference source is connected to circuit board through a stitch, it is characterized in that, between the ground of this stitch and circuit board, is connected an inductance.
2. the circuit board of reduction antenna electromagnetic interference as claimed in claim 1 is characterized in that, this interference source is the metallic object that is covered near the element of this antenna.
3. the circuit board of reduction antenna electromagnetic interference as claimed in claim 1 is characterized in that, this antenna is a gps antenna, and its frequency range that receives signal is 1.575GHz.
4. the circuit board of reduction antenna electromagnetic interference as claimed in claim 1 is characterized in that, the value of this inductance at 12nH between the 82nH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110378149XA CN102497725A (en) | 2011-11-24 | 2011-11-24 | Circuit board capable of reducing antenna electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110378149XA CN102497725A (en) | 2011-11-24 | 2011-11-24 | Circuit board capable of reducing antenna electromagnetic interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102497725A true CN102497725A (en) | 2012-06-13 |
Family
ID=46189500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110378149XA Pending CN102497725A (en) | 2011-11-24 | 2011-11-24 | Circuit board capable of reducing antenna electromagnetic interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102497725A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1422096A (en) * | 2001-11-30 | 2003-06-04 | 萨基姆公司 | Mobile telephone with parts mounted at antenna position |
| CN2807617Y (en) * | 2005-07-04 | 2006-08-16 | 于江宏 | Mobile phone circuit board for improving function of mobile phone antenna |
-
2011
- 2011-11-24 CN CN201110378149XA patent/CN102497725A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1422096A (en) * | 2001-11-30 | 2003-06-04 | 萨基姆公司 | Mobile telephone with parts mounted at antenna position |
| CN2807617Y (en) * | 2005-07-04 | 2006-08-16 | 于江宏 | Mobile phone circuit board for improving function of mobile phone antenna |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120613 |