CN1992429A - Capacitance loading inner antenna - Google Patents
Capacitance loading inner antenna Download PDFInfo
- Publication number
- CN1992429A CN1992429A CN 200510130796 CN200510130796A CN1992429A CN 1992429 A CN1992429 A CN 1992429A CN 200510130796 CN200510130796 CN 200510130796 CN 200510130796 A CN200510130796 A CN 200510130796A CN 1992429 A CN1992429 A CN 1992429A
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- CN
- China
- Prior art keywords
- sheet metal
- antenna
- bonding jumper
- square type
- type sheet
- 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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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
- H01Q5/364—Creating multiple current paths
- H01Q5/371—Branching current paths
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Support Of Aerials (AREA)
- Details Of Aerials (AREA)
Abstract
The invention discloses a capacitive loading internal antenna, used for clamshell phones, including the conductor unit comprised by the first rectangular metal sheet and the second rectangular metal sheet, also including: the antenna unit, installed at the top of the first rectangular metal sheet and used to form GSM resonator; the capacitive loading unit, installed at the top of the first rectangular metal sheet and connecting with the antenna unit, and used to form DCS resonator, and to implement the matching of the antenna input impedance. In the invention, the capacitance loading internal antenna, the antenna unit and the capacitance loading unit are all single planar structure, easy to manufacture; the effect integration of the capacitive load unit and antenna unit reducing the total volume of the antenna and feed electricity; the antenna adaptively impedance matching the cell phone environment, which stables the antenna performance; when the return wave loss is equal to -8dB, the antenna respectively implements 70MHz and 140MHz impedance bandwidth for 0.92GHz and 2.0GHz.
Description
Technical field
The present invention relates to mobile communication terminal, particularly the antenna in the mobile communication terminal.
Background technology
At present, mobile phone all is a clamshell phone much to GSM/DCS (Global System of Mobile Communication/Digital CellularSystem), and clamshell phone utilizes built-in aerial to carry out the transmission and the reception of signal mostly.
Yet there is following shortcoming in the built-in aerial of present clamshell phone:
Antenna element and capacitive load unit are difficult to make;
The integrated degree of capacitive load unit and antenna element is low, and the antenna feed volume is big;
Can't realize the self adaptation impedance matching of antenna, the antenna performance instability to mobile phone environment.
Summary of the invention
The object of the present invention is to provide a kind of capacitance loading inner antenna, be easy to manufacturing, integrated level height, stable performance simultaneously, solve existing clamshell phone built-in aerial be difficult to make, volume is big and unsettled shortcoming.
To achieve these goals, the invention provides a kind of capacitance loading inner antenna, be used for clamshell phone, comprise the conductor element that constitutes by the first square type sheet metal and the second square type sheet metal, also comprise:
Antenna element is arranged at the top of the first square type sheet metal, is used to form the GSM resonator;
The capacitive load unit is arranged at the top of the first square type sheet metal, is electrically connected with antenna element, is used to form the DCS resonator, and is used to realize the coupling of antenna feed impedance;
Above-mentioned capacitance loading inner antenna, the capacitive load unit specifically comprises:
First bonding jumper is parallel to the top of the first square type sheet metal;
Second bonding jumper is vertically connected between the top of first bonding jumper and the first square type sheet metal;
The 3rd bonding jumper be arranged in parallel with second bonding jumper interval preset distance, and the top is connected with the rear end of first bonding jumper, and integral body is positioned at the bottom of first bonding jumper;
Electric capacity is arranged at the top, rear end of first bonding jumper front interval preset distance of the front end and first bonding jumper;
Above-mentioned capacitance loading inner antenna, second bonding jumper can be with respect to first bonding jumper and the first square type sheet metal top slide, change the spacing distance between second bonding jumper and the 3rd bonding jumper, be used for, realize the coupling of antenna feed impedance in conjunction with changes in capacitance.
Above-mentioned capacitance loading inner antenna, antenna element specifically comprises:
The resonance sheet metal, inside is formed with given shape and the opening cavity towards front end, bottom and cavity are to there being a plurality of rectangular depression, the top front end is connected with the top of electric capacity, bottom front is connected with the 3rd bonding jumper, and simultaneously top and bottom parallel and be arranged at the top of the first square type sheet metal at interval preset distance;
Feed port sheet metal 22, (being sheet metal 22 bottoms is electrically connected with RF transmission line from cell phone transceiver for the antenna RF distributing point in the bottom, the ground of this transmission line is electrically connected with the top of the first square type sheet metal), the top of sheet metal 22 is connected with the bottom of the 3rd bonding jumper.
Above-mentioned capacitance loading inner antenna, the inner cavity that forms of described resonance sheet metal comprise continuously arranged successively first rectangular enclosure, second rectangular enclosure and at least one the 3rd cavity with preset width and height from the front end to the rear end;
The first rectangular enclosure top is concordant with resonance sheet metal top;
The second rectangular enclosure top is concordant with resonance sheet metal top;
The 3rd cavity comprises the 5th rectangular enclosure and the 6th rectangular enclosure that certain distance is all arranged to resonance sheet metal top and bottom of two perforations;
The bottom of resonance sheet metal and the first rectangular enclosure opposite position are the rectangle blank of preset width and height; The bottom of resonance sheet metal also has and the same line of symmetry of the 5th cavity, and the rectangular depression of preset width and height is arranged.
Capacitance loading inner antenna of the present invention, built-in aerial for the GSM/DCS mobile phone, have unique plane space structure and lumped capacity and load the integrated of loop, can load the loop by tuning this, improve the electric property of antenna on the one hand, on the other hand, realized the self adaptation impedance matching of antenna to mobile phone environment, increased the scope of application of antenna greatly, had the following advantages: antenna element and capacitive load unit are the single face planar structure, are easy to make; The effective integration of capacitive load unit and antenna element has reduced antenna, feed cumulative volume; Antenna has been stablized antenna performance to the self adaptation impedance matching of mobile phone environment; When return loss equal-during 8dB, antenna has been realized the impedance bandwidth of 70MHz and 140Mhz respectively at 0.92GHz, 2.0GHz.
Description of drawings
Fig. 1 is the overall structure figure of capacitance loading inner antenna of the present invention;
Fig. 2 is the detailed structure schematic diagram of antenna element and capacitive load unit;
When Fig. 3 was C=0.3pF, antenna return loss was to the dependence schematic diagram of resonance length Lf;
Fig. 4 is the dependence schematic diagram of antenna return loss to loading capacitance C;
Fig. 5 is C=0.3pF, and during Lf=1.9mm, return loss is to the frequency dependence schematic diagram;
Fig. 6 (a), Fig. 6 (b), Fig. 6 (c) they are C=0.3pF, during Lf=1.9mm, and the comparison schematic diagram of gain characteristic actual measurement and theoretical value.
Embodiment
Capacitance loading inner antenna of the present invention is used for clamshell phone, comprising: conductor element 1, antenna element 2 and capacitive load unit 3, wherein:
Capacitive load unit 3 is arranged at the top of the first square type sheet metal, and is electrically connected with antenna element 2, forms the DCS resonator, is used for two-band (GSM/DCS) electromagnetic radiation, is used to realize the coupling of antenna feed impedance simultaneously;
Wherein the first square type sheet metal, the second square type sheet metal, antenna element and capacitive load unit have constituted the conversion open architecture of electromagnetic wave and high-frequency current jointly.
Below in conjunction with Fig. 1 and Fig. 2 each part of capacitive load formula built-in antenna of the present invention is elaborated, Fig. 1 is the overall structure figure of capacitance loading inner antenna of the present invention, and Fig. 2 is the antenna element 2 of capacitance loading inner antenna of the present invention and the detailed structure schematic diagram of capacitive load unit 3.
As shown in Figure 1, conductor element 1 is the first square type sheet metal 11 and the second square type sheet metal 12, and when clamshell phone was in open mode, the two was certain included angle, and was not electrically connected; And the upper end of the combination of antenna element 2 and capacitive load unit 3 and the first square type sheet metal 11 is electrically connected.
As shown in Figure 2, the capacitive load unit 3 of capacitive load formula built-in antenna of the present invention specifically comprises:
First bonding jumper 31 is parallel to the top of the first square type sheet metal 11;
Second bonding jumper 32 has specific width L0 and length W2, is vertically connected between the top of first bonding jumper 31 and the first square type sheet metal 11, and can be with respect to first bonding jumper 31 and the first square type sheet metal, 11 top slide;
The 3rd bonding jumper 33,32 spacing distance Lf be arranged in parallel with second bonding jumper, and the top is connected with the rear end of first bonding jumper 31, and integral body is positioned at the bottom of first bonding jumper 31;
Electric capacity 34 is arranged at the top, rear end of first bonding jumper 31, highly is Wc, and the front end distance of the front end and first bonding jumper 31 is L2;
When second bonding jumper 32 slides with respect to first bonding jumper 31 and the first square type sheet metal 11, can change its with the 3rd bonding jumper 33 between spacing distance Lf, in conjunction with the variation of capacitor C, the coupling of realization antenna feed impedance.
As shown in Figure 2, the antenna element 2 of capacitive load formula built-in antenna of the present invention specifically comprises:
Resonance sheet metal 21, inside is formed with a given shape and the opening cavity 210 towards front end, it forms electromagnetic coupled, the impedance bandwidth of broadening GSM, the top front end is connected with the top of electric capacity 34, bottom front is connected with the 3rd bonding jumper 33, and simultaneously top and bottom all is parallel to the top of the first square type sheet metal 11, and the W3 setting of being separated by of the top of bottom and the first square type sheet metal 11;
Feed port sheet metal 22, (being sheet metal 22 bottoms is electrically connected with RF transmission line from cell phone transceiver for the antenna RF distributing point in the bottom, the ground of this transmission line is electrically connected with the top of the first square type sheet metal 11), the top of sheet metal 22 is connected with the bottom of the 3rd bonding jumper 33, forms the feed port of antenna.
These resonance sheet metal 21 top length are L1, the rear end height is W1, concrete shape and structure are as shown in Figure 2, resonance sheet metal 21 inside be formed with a given shape and opening towards the cavity 210 of front end comprise from resonance sheet metal 21 front ends to the rear end continuously arranged successively first rectangular enclosure 2101, second rectangular enclosure 2102 and at least one the 3rd cavity 2103, form the GSM resonator by specific cavity shape, be used for the impedance bandwidth of broadening GSM resonator.
Wherein, first rectangular enclosure, 2101 tops are concordant with resonance sheet metal 21 tops, and the bottom is W1-W4 to the height at resonance sheet metal 21 tops, and width is L3;
Second rectangular enclosure, 2102 tops are concordant with resonance sheet metal 21 tops, and the bottom is W1 to the height at resonance sheet metal 21 tops, and width is L3-L4;
The 3rd cavity 2103 comprises the rectangular enclosure 21031 and 21032 of two perforations, wherein:
Rectangular enclosure 21031 tops and resonance sheet metal 21 distance from top Ws highly are W1-W4-Ws, and width is Ls1+2Lt; Rectangular enclosure 21032 tops and resonance sheet metal 21 distance from top Wt highly are W1-Wt, and width is Ls2;
Simultaneously, the bottom of resonance sheet metal 21 and first rectangular enclosure, 2101 opposite positions are the rectangle blank, and width is L4, highly is W1; The bottom of this resonance sheet metal 21 also has and cavity 21031 same line of symmetries, and width is Ls1, highly is the rectangular depression of W4.
For the DCS resonator, the GSM resonator is the low-loss loading element; For the GSM resonator, the DCS resonator is the low-loss loading element equally, and being used of the two constituted GSM/DCS two waveband radiator.
Antenna element is when existing conductor element, formed two electromagnetic resonance loops, their difference resonance is at two working frequency range (GSM900/DCS1800), simultaneously, the high-frequency current of low frequency end (GSM900 frequency range) presents higher reactance at the distributing point place to the DCS resonator; The high-frequency current of same front end (DCS frequency range) presents higher reactance at the distributing point place to the GSM resonator, and GSM resonator and DCS resonator have good electromagnetic isolation degree, have simplified circuit debugging.
In conjunction with Fig. 1 and Fig. 2, structure and finite element method according to capacitive load formula built-in antenna of the present invention obtain following data:
L1＝22.6mm
L2＝6.6mm
L3＝7.4mm
L0＝0.4mm
L4＝3.9mm
Lf＝5.7mm
Ls1＝2.0mm
Ls2＝1.6mm
Lt＝0.2mm
W1＝8.4mm
W2＝7.0mm
W3＝0.4mm
W4＝3.8mm
Ws＝3.0mm
Wt＝2.2mm
Wc＝1.8mm
c＝0.2pF
εr＝3.8
Suppose to become after clamshell phone is renovated the angles of 158 degree simultaneously.
Carry out the antenna manufacturing by above-mentioned size, and test, actual measurement and numerical result such as Fig. 3, Fig. 4, Fig. 5 and shown in Figure 6 at the standard microwave dark room.
As seen from Figure 3, built-in aerial of the present invention can be operated in the GSM900/DCS1800 frequency range effectively, owing to do not consider the influence of mobile phone plastic housing here, resonance frequency is by being higher than the GSM900/DCS1800 Frequency Design, and, when C=0.3pF, change Lf and can obviously change the recessed limit degree of depth of resonance curve of the return loss of DCS resonant tank, but do not change the resonant frequency range of DCS resonant tank; In conjunction with Fig. 4, the resonance frequency that can obtain the DCS resonant tank is mainly by L2, W2 and loading capacitance C decision; The change of Lf does not simultaneously all have obvious influence to the resonant frequency range and the recessed limit degree of depth of resonance curve of GSM resonant tank, illustrate that at this moment the electromagnetic isolation degree is higher between the DCS resonant tank and GSM resonant tank.
As seen from Figure 4, loading capacitance C can obviously change the resonant frequency range of DCS and GSM, but do not change resonant bandwidth, this is because loading capacitance C is positioned at the cause of the terminate load position of two resonant tanks, utilizes loading capacitance C to realize the Adaptive matching of built-in aerial impedance of the present invention.
Can find out that by Fig. 5, Fig. 6 built-in aerial impedance value of the present invention and measured value have higher consistency.
Simultaneously; shown in Fig. 6 (a); in ° plane, θ=90 and Φ=180 °; [implication is seen Fig. 6 (c) for θ and Φ; DCS has 10dB; GSM has the power depression of 15dB; this direction is pointed to corresponding to human head location; shown in Fig. 6 (b); on ° plane, Φ=90 and θ=270 ° direction is pointed to corresponding to the human head location direction; DCS has 10dB; GSM has the power depression of 15dB, and therefore, this curve has disclosed built-in antenna of mobile phone of the present invention and had very low SAR (Signal Absorb Ratio; the signal absorption ratio) characteristic promptly has the certain protection effect to human body.
By further measurement, can draw this antenna and have medium gain (greater than 0.5dBi).
Capacitive load formula built-in antenna of the present invention can reach following index:
Antenna size: 29.2mm*7mm*0.1mm
Antenna structure: plane individual layer
PCB：80mm*35mm*1m
Operating frequency: 890～960MHz; 1710～1890MHz
Input impedance: 50 Ω
Input vswr: less than 2.2
Gain: greater than 0.5dBi
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (6)
1, a kind of capacitance loading inner antenna is used for clamshell phone, comprises the conductor element that is made of the first square type sheet metal and the second square type sheet metal, it is characterized in that, also comprises:
Antenna element is arranged at the top of the first square type sheet metal, is used to form the GSM resonator;
The capacitive load unit is arranged at the top of the first square type sheet metal, is electrically connected with antenna element, is used to form the DCS resonator.
2, capacitance loading inner antenna according to claim 1 is characterized in that, the capacitive load unit specifically comprises:
First bonding jumper is parallel to the top of the first square type sheet metal;
Second bonding jumper is vertically connected between the top of first bonding jumper and the first square type sheet metal;
The 3rd bonding jumper be arranged in parallel with second bonding jumper interval preset distance, and the top is connected with the rear end of first bonding jumper, and integral body is positioned at the bottom of first bonding jumper;
Electric capacity is arranged at the top, rear end of first bonding jumper, the front interval preset distance of the front end and first bonding jumper.
3, capacitance loading inner antenna according to claim 2, it is characterized in that, second bonding jumper can be with respect to first bonding jumper and the first square type sheet metal top slide, change the spacing distance between second bonding jumper and the 3rd bonding jumper, in conjunction with changes in capacitance, realize the coupling of antenna feed impedance.
4, according to claim 2 or 3 described capacitance loading inner antennas, it is characterized in that antenna element specifically comprises:
The resonance sheet metal, inside is formed with given shape and the opening cavity towards front end, bottom and cavity are to there being a plurality of rectangular depression, the top front end is connected with the top of electric capacity, bottom front is connected with the 3rd bonding jumper, top and bottom is parallel simultaneously, and interval, the top of the bottom and first square type sheet metal preset distance;
The feed port sheet metal, the bottom is electrically connected with the RF transmission line of cell phone transceiver, and the sheet metal top is connected with the bottom of the 3rd bonding jumper.
5, capacitance loading inner antenna according to claim 4, it is characterized in that the inner cavity that forms of described resonance sheet metal comprises continuously arranged successively first rectangular enclosure, second rectangular enclosure and at least one the 3rd cavity with preset width and height from the front end to the rear end;
The first rectangular enclosure top is concordant with resonance sheet metal top;
The second rectangular enclosure top is concordant with resonance sheet metal top;
The 3rd cavity comprises the 5th rectangular enclosure and the 6th rectangular enclosure that certain distance is all arranged to resonance sheet metal top and bottom of two perforations;
The bottom of resonance sheet metal and the first rectangular enclosure opposite position are the rectangle blank of preset width and height; The bottom of resonance sheet metal also has and the same line of symmetry of the 5th cavity, and the rectangular depression of preset width and height is arranged.
According to claim 1,2 or 3 described capacitance loading inner antennas, it is characterized in that 6, the first square type sheet metal and the second square type sheet metal are the main frame mainboard PCB ground and the upturning lid PCB ground of described clamshell phone.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510130796 CN1992429B (en) | 2005-12-30 | 2005-12-30 | Capacitance loading inner antenna |
| PCT/CN2006/001372 WO2007076651A1 (en) | 2005-12-30 | 2006-06-16 | Capacitor loaded built-in antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510130796 CN1992429B (en) | 2005-12-30 | 2005-12-30 | Capacitance loading inner antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1992429A true CN1992429A (en) | 2007-07-04 |
| CN1992429B CN1992429B (en) | 2011-10-26 |
Family
ID=38214452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510130796 Expired - Fee Related CN1992429B (en) | 2005-12-30 | 2005-12-30 | Capacitance loading inner antenna |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1992429B (en) |
| WO (1) | WO2007076651A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5291210A (en) * | 1988-12-27 | 1994-03-01 | Harada Kogyo Kabushiki Kaisha | Flat-plate antenna with strip line resonator having capacitance for impedance matching the feeder |
| CN2476881Y (en) * | 2000-12-30 | 2002-02-13 | 深圳市中兴通讯股份有限公司 | Built-in planar aerial for mobile phone |
| US6798383B2 (en) * | 2001-02-05 | 2004-09-28 | Sony Corporation | Low profile small antenna and constructing method therefor |
| CN2530353Y (en) * | 2001-08-27 | 2003-01-08 | 耀登科技股份有限公司 | Capacitor loading monopole plane antenna |
-
2005
- 2005-12-30 CN CN 200510130796 patent/CN1992429B/en not_active Expired - Fee Related
-
2006
- 2006-06-16 WO PCT/CN2006/001372 patent/WO2007076651A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007076651A1 (en) | 2007-07-12 |
| CN1992429B (en) | 2011-10-26 |
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Granted publication date: 20111026 Termination date: 20201230 |