CN101572339B - Positioning antenna for portable terminal and portable terminal thereof - Google Patents
Positioning antenna for portable terminal and portable terminal thereof Download PDFInfo
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- CN101572339B CN101572339B CN 200810105640 CN200810105640A CN101572339B CN 101572339 B CN101572339 B CN 101572339B CN 200810105640 CN200810105640 CN 200810105640 CN 200810105640 A CN200810105640 A CN 200810105640A CN 101572339 B CN101572339 B CN 101572339B
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Abstract
The invention provides a positioning antenna for a portable terminal and the portable terminal thereof. The positioning antenna comprises a frequency selective surface and a microstrip antenna main body, wherein the frequency selective surface is provided with first resonant frequency and second resonant frequency; and the microstrip antenna main body is arranged below the frequency selective surface and provided with first characteristic information corresponding to the antenna directivity of the first resonant frequency and second characteristic information corresponding to the antenna directivity of the second resonant frequency. The invention solves the technical problem that the positioning can only be realized under certain fixed attitude in the prior art. The antenna has a restructurable directional diagram, not only can form high directional gain but also can be restructured into omnidirectional gain, and can be effectively positioned under any satellite attitude.
Description
Technical field
The present invention relates to the terminal antenna technology of navigation system, particularly relate to a kind of positioning antenna for portable terminal device and portable terminal device thereof.
Background technology
Popularizing global positioning system at notebook is the trend of future market, and global positioning system has higher requirements to polarization and the directional diagram (characteristic information of antenna directivity) of terminal antenna.The Big Dipper navigation system of China particularly requires highly to terminal antenna gain, even use the low noise amplifier of high-gain (40dB), antenna gain still is greater than 4dBi.And on notebook, the limited space that can be used for fixing up an aerial wire is even " little band positioning antenna " size is still too large: long approximately 50mm, wide 50mm, thickness 3～5mm, and satellite direction must remain in the normal direction on 50mm * 50mm plane+/-50 degree, is difficult to convenient the use; And using the little ceramic medium antenna gain of volume too low, this is first difficult problem of prior art.
On the other hand, consideration for cost or robustness, preferably same notebook is designed to both can use GPS (Global Positioning System, global positioning system) system, can use dipper system again, need multilayer dielectricity and have " the GPS-Big Dipper " double frequency positioning antenna now, in order to ensure enough bandwidth, antenna thickness is increased to about 6～10mm, has more aggravated this contradiction.Existing positioning antenna directional diagram is all fixed, thus notebook can only under a certain fixed pose, realize the location, be unfavorable for using at the volley, this is the Second Problem of prior art.
Some notebook has adopted the almag framework for sturdy and durable, and ThinkPad for example descends the radiance of antenna, and gain reduces, and how designs the positioning antenna of high-gain at the machine that metal framework is arranged, and this is the problem that the 3rd needs solve.
It below is the explanation of prior art being installed positioning antenna at notebook.
Prior art scheme 1: little band positioning antenna is installed at keyboard and touch-screen next door.
The shortcoming of this scheme is: in this piece zone of notebook, this antenna gain 0dBi that only has an appointment can normally use gps system, and hand can not use keyboard during use, and can only open under the state that keeps flat at notebook and locate.To dipper system, this antenna gain is not high enough, can't use.
Existing technical scheme 2: little band positioning antenna is installed at the LCD screen back side
The shortcoming of this scheme is: the LCD screen segment thickness increases by 5～10mm.For the notebook that uses the magnalium framework, common little band positioning antenna is too thick, can't be placed in the magnalium framework.
Existing technical scheme 3: the edge uses long narrow stick antenna above LCD screen
The shortcoming of this scheme is: because very narrow at the LCD screen superjacent air space, and antenna and the miscellaneous equipment of other frequency ranges to be installed also, the gain of the antenna 0dBi that only has an appointment own, and can't accomplish circular polarization, gain also will be lost 3dB, to such an extent as to gain is only had an appointment-3dBi, can use gps system, can't satisfy dipper system to the requirement of gain.
Summary of the invention
The purpose of this invention is to provide a kind of positioning antenna for portable terminal device and portable terminal device thereof, solve prior art can only realize the location under a certain fixed pose technical problem.
To achieve these goals, the invention provides a kind of positioning antenna for portable terminal device, comprising:
Compact frequency selective surface has the first resonance frequency and the second resonance frequency;
Microstrip antenna main body is arranged on described Compact frequency selective surface below, has the second characteristic information of the antenna directivity of first characteristic information of antenna directivity of corresponding described the first resonance frequency and corresponding described the second resonance frequency.
Preferably, above-mentioned positioning antenna, wherein, described microstrip antenna main body be shaped as thickness less than the flat pattern of length and width.
Preferably, above-mentioned positioning antenna, wherein, described Compact frequency selective surface is the flat board that is arranged with a plurality of holes, described the first resonance frequency and described the second resonance frequency are determined by shape, size and the spacing in described a plurality of holes.
Preferably, above-mentioned positioning antenna, wherein, the high-gain radiation direction of described the first characteristic information is the normal orientation of described Compact frequency selective surface, the high-gain radiation direction of described the second characteristic information is the tangential direction of described Compact frequency selective surface; Perhaps the high-gain radiation direction of described the second characteristic information is the normal orientation of described Compact frequency selective surface, and the high-gain radiation direction of described the first characteristic information is the tangential direction of described Compact frequency selective surface.
Preferably, above-mentioned positioning antenna, wherein, described the first resonance frequency is the corresponding operating frequency of Big Dipper navigation system, described the second resonance frequency is the corresponding operating frequency of global positioning system.
Preferably, above-mentioned positioning antenna wherein, also comprises switching device shifter, is arranged on described microstrip antenna main body, is used for making described positioning antenna be operated in described the first resonance frequency and/or described the second resonance frequency.
Preferably, above-mentioned positioning antenna, wherein, described microstrip antenna main body comprises what order superposeed: reference metal ground floor, metal ground layer, dielectric-slab, two relative triangle metal radiation patch; Described metal ground layer is printed on the lower surface of described dielectric-slab and connects described reference metal ground floor, and described Compact frequency selective surface covers described metal radiation paster top in the mode of insulation.
Preferably, above-mentioned positioning antenna, wherein, described switching device shifter is expansion paster and the switch that is arranged on described metal radiation paster.
On the other hand, provide a kind of portable terminal device, comprise main frame and the LCDs that is articulated in described main frame, also comprise the positioning antenna that is arranged on the described LCDs back side, described positioning antenna comprises:
Compact frequency selective surface has the first resonance frequency and the second resonance frequency;
Microstrip antenna main body is arranged on described Compact frequency selective surface below, has the second characteristic information of the antenna directivity of first characteristic information of antenna directivity of corresponding described the first resonance frequency and corresponding described the second resonance frequency.
Preferably, above-mentioned portable terminal device, wherein, described microstrip antenna main body be shaped as thickness less than the flat pattern of length and width.
Preferably, above-mentioned portable terminal device, wherein, described Compact frequency selective surface is the backboard of described LCDs, and described backboard is arranged with a plurality of holes, and described the first resonance frequency and described the second resonance frequency are determined by shape, size and the spacing in described a plurality of holes.
Preferably, above-mentioned portable terminal device, wherein, the high-gain radiation direction of described the first characteristic information is the normal orientation on plane, described liquid crystal display screen place, the high-gain radiation direction of described the second characteristic information is the tangential direction on plane, described liquid crystal display screen place; Perhaps, the high-gain radiation direction of described the second characteristic information is the normal orientation on plane, described liquid crystal display screen place, and the high-gain radiation direction of described the first characteristic information is the tangential direction on plane, described liquid crystal display screen place.
Preferably, above-mentioned portable terminal device, wherein, described portable terminal device is mobile phone or notebook computer, and described the first resonance frequency is the corresponding operating frequency of Big Dipper navigation system, and described the second resonance frequency is the corresponding operating frequency of global positioning system.
The technique effect of the embodiment of the invention is:
1) embodiment of the invention is made the Compact frequency selective surface structure with the magnalium framework of notebook, the firm support that had both kept the notebook LCD screen, can utilize again the aerial radiation sheet of the lamella space installation microstrip antenna in the support, make microstrip antenna main body be flat shape, had ultra-thin structure, save the space, reduced the impact of positioning antenna on liquid crystal display screen thickness.
2) Compact frequency selective surface has two resonance frequencys, the corresponding both direction figure of difference, the high-gain radiation direction of both direction figure is the angles of about 90 degree, not only can be operated in two frequency ranges, also in the normal direction at the LCD screen back side with tangentially can form high-gain.
Dual frequency characteristics is used in GPS-Big Dipper double locating system.This antenna can be operated in double frequency, carries out simultaneously the location of GPS and dipper system.
By the switch on the triangle radiation fin, can change resonance branch length, thereby form reconfigurable directional diagram.
The restructural directional diagram adapts to various operating states and the satellite angle of pitch.This antenna has reconfigurable directional diagram, not only can form high directive gain, and going back restructural is omnidirectional gain, can effective location under any attitude of satellite.
3) high-gain is applicable to dipper system.Because dipper system requires antenna gain very high, the used antenna of the embodiment of the invention can be realized high-gain at notebook, reaches the dipper system requirement.Complete machine has firm magnalium framework.For reinforced notebook computer, the magnalium framework is arranged, under the prerequisite that high-gain aerial has been installed, still keep the magnalium framework, make notebook very firm.
Description of drawings
The structure chart of the positioning antenna Compact frequency selective surface that Fig. 1 provides for the embodiment of the invention;
The decomposition chart of the positioning antenna that Fig. 2 provides for the embodiment of the invention;
The resonance frequency simulation parameter schematic diagram of the positioning antenna that Fig. 3 provides for the embodiment of the invention;
The expansion paster of the positioning antenna that Fig. 4 provides for the embodiment of the invention and the schematic diagram of switch;
The projection diagram of first direction figure in X-Y, X-Z, Y-Z plane that Fig. 5 a, 5b, 5c provide for the embodiment of the invention;
The projection diagram of second direction figure in X-Y, X-Z, Y-Z plane that Fig. 6 a, 6b, 6c provide for the embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, below in conjunction with accompanying drawing specific embodiment is described in detail.
The embodiment of the invention provides the frequency selectivity Ultrathin high gain restructural positioning antenna of a kind of portable terminal device location.Positioning antenna Compact frequency selective surface topology view as shown in Figure 1, positioning antenna comprises: Compact frequency selective surface 100, have the first resonance frequency and the second resonance frequency, the microstrip antenna main body (comprising the 201-204 among Fig. 2) of pancake (thickness is less than length and width), be close to and be arranged on described Compact frequency selective surface below, have the first direction figure of corresponding described the first resonance frequency and the second direction figure of corresponding described the second resonance frequency.
The decomposition chart of the positioning antenna that Fig. 2 provides for the embodiment of the invention; Pancake microstrip antenna main body is by reference metal ground 201, metal ground 202, and 203, two relative triangle metal radiation patch 204 of dielectric-slab form jointly.Metal Compact frequency selective surface 100 links to each other with reference ground 201, and ground level 202 is printed on the back side of dielectric-slab 203, links to each other with reference ground 201.Radiation patch 204 is in the front of dielectric-slab 203, and the tip of two pasters is feed port.Compact frequency selective surface 100 covers paster 204 tops, and paster is without electrical connection, be to be cut away periodically the hole and consisted of by a metal plate, but the hole hexagon also can be other shape such as square, circular.The selecting frequency characteristic of the shape in aperture, size and effect of distance Compact frequency selective surface.
Figure 3 shows that the resonance frequency simulation parameter schematic diagram of positioning antenna, the positioning antenna of the embodiment of the invention has two resonance frequencys, respectively can corresponding GPS and the Big Dipper a kind of, also can aim at simultaneously the operating frequency of two kinds of navigation systems.
The portable terminal device of the embodiment of the invention is the reinforced notebook computer with magnalium framework, positioning antenna is the superthin structure of flat pattern, be fitted in the frequently back side of curtain of notebook liquid crystal, the metal Compact frequency selective surface is the frequently back plate surface of curtain of liquid crystal, and is inner at the magnalium framework.Antenna has restructural (reconfigurability, be exactly the ability that systemic-function changes along with demand) two kinds of gains directional diagram (directional diagram be the expression antenna directivity characteristic curve, namely describe the emission that antenna has or receive the figure of electromagnetic wave ability on all directions), a kind of is normal direction along the LCD screen back side, and a kind of is the tangential of the LCD screen back side.The corresponding resonance frequency of each directional diagram.
Among a kind of embodiment of the present invention, the operating frequency of the corresponding Big Dipper navigation system of the first resonance frequency, the operating frequency of the corresponding GPS of the second resonance frequency.
Directional diagram belongs to the attribute of positioning antenna own, in with this situation as solid reference coordinate of antenna, the gain radiation direction of the directional diagram of this positioning antenna is indeclinable, and the radiation direction of the high-gain in the directional diagram itself is fixed with respect to this antenna.First direction figure corresponding to the first resonance frequency is shown in Fig. 5 a, 5b, 5c, take the plane at Compact frequency selective surface place as X-Y plane, the vertical X-Y plane of Z axis, if antenna horizontal positioned, then X-Y plane overlaps with horizontal plane, being oriented to straight down of Z axis, Fig. 5 a, 5b, 5c are the respectively perspective view in X-Y, X-Z, Y-Z plane of first direction figure.
Among Fig. 5 a, the radiation that gains as can be known is comparatively balanced at X-Y plane, Fig. 5 b, 5c as can be known, on X-Z, Y-Z plane, the radiation direction of high-gain is all towards the negative semiaxis of Z axis.Therefore, when positioning antenna is placed in the LCDs of notebook, when the notebook horizontal positioned, and display screen is closed, and X-Y overlaps with horizontal plane, at this time, the radiation direction of first direction figure high-gain is pointed to the negative semiaxis of Z axis, the satellite that namely points into the sky straight up, the first resonance frequency that at this time has first direction figure performance has good locating effect, namely has the locating effect of good Big Dipper navigation system.But, when display screen is opened, just rotate along with the rotation of antenna based on the radiation direction of the high-gain of the directional diagram of antenna itself, just point into the sky no longer straight up, but point to horizontal direction, at this time the locating effect of Big Dipper navigation system is less better.
The second direction figure that the second resonance frequency is corresponding such as Fig. 6 a, 6b, shown in the 6c, the high-gain radiation direction of second direction figure can be designed as the angle that is general 90 degree with the high-gain radiation direction of first direction figure, when display screen is opened, when the high-gain radiation direction of first direction figure is the level sensing, the high-gain radiation direction of second direction figure has just been pointed to satellite straight up, like this, no matter notebook computer is in any state, a total energy in two resonance frequencys has the high-gain demutation direction of pointing to satellite, namely can ensure the location that among Big Dipper navigation system and the GPS at least one can be good.
In another embodiment of the invention, as shown in Figure 4, by increasing expansion paster 205 and switch 206 on the triangle patch next door, and appropriate periodicity aperture and pitch-row are set for metal Compact frequency selective surface 100, can allow the resonance frequency of antenna change, make the first original resonance frequency become the second resonance frequency, thereby can select antenna to have any antenna pattern in Big Dipper frequency.Equally, also can select antenna to have any antenna pattern in the GPS frequency.
The below is described according to the situation parameter value.
Shown in Fig. 5 a, 5b, 5c, when the liquid crystal display screen closure, liquid crystal display screen is towards the Z axis positive direction, and the LCD screen back side is towards Z axis negative direction (sky straight up).Central at coordinate system with reference to ground and the earth.Under the first radiation mode, the radiation direction of antenna element is towards the half space of Z axis negative direction; Under the second radiation mode, the main radiation direction of antenna and X-Y plane angle are less.Two kinds of radiation modes all have wider 3dB gain pattern bandwidth.
In the gain of the first band antenna shown in Fig. 5 a, 5b, 5c, the linear polarization gain peak is about 8.27dBi, GPS and dipper system all are circular polarization, receive circularly polarized signal with linear polarized antenna, gain reduces 3dB, the present invention is 5.27dBi to the gain peak of right-handed circular polarization framing signal, and the gain far above general microstrip antenna 0dBi is specially adapted to dipper system.
In the gain pattern of the second band antenna at X-Y, Y-Z, the projection on the X-Z plane is shown in Fig. 6 a, 6b, 6c, the right-handed circular polarization gain is about 2.99dBi.Greater than 100 degree, the second mode of resonance has fine practicality greater than 60 degree to the angle of this antenna right-handed circular polarization gain more than 0dBi in the first mode of resonance.
The portable terminal device of the embodiment of the invention can also can be mobile phone for notebook computer, and portable terminal device comprises main frame and be articulated in the LCDs of described main frame that positioning antenna is arranged on the described LCDs back side.The described Compact frequency selective surface of positioning antenna is the backboard of described LCDs, when described LCDs in running order, the high-gain radiation direction of described first direction figure is the normal orientation on plane, described liquid crystal display screen place, when described LCDs is in closure state, the high-gain radiation direction of described second direction figure is the tangential direction on plane, described liquid crystal display screen place; Perhaps, when described LCDs in running order, the high-gain radiation direction of described second direction figure is the tangential direction on plane, described liquid crystal display screen place, when described LCDs is in closure state, the high-gain radiation direction of described first direction figure is the normal orientation on plane, described liquid crystal display screen place.
Adopt embodiment of the invention advantage afterwards to be:
1) embodiment of the invention is made the Compact frequency selective surface structure with the magnalium framework of notebook, the firm support that had both kept the notebook LCD screen, can utilize again the aerial radiation sheet of the lamella space installation microstrip antenna in the support, make microstrip antenna main body be flat shape, had ultra-thin structure, save the space, reduced the impact of positioning antenna on liquid crystal display screen thickness.
2) Compact frequency selective surface has two resonance frequencys, the corresponding both direction figure of difference, the high-gain radiation direction of both direction figure is the angle of about 90 degree, not only can be operated in two frequency ranges, also in the normal direction at the LCD screen back side with tangentially can form high-gain, thereby form reconfigurable directional diagram.
Dual frequency characteristics is used in GPS-Big Dipper double locating system.A kind of distortion of this antenna can be operated in double frequency, carries out simultaneously the location of GPS and dipper system.
The restructural directional diagram adapts to various operating states and the satellite angle of pitch.A kind of embodiment of this antenna has reconfigurable directional diagram, not only can form high directive gain, and going back restructural is omnidirectional gain, can effective location under any attitude of satellite.
3) high-gain is applicable to dipper system.Because dipper system requires antenna gain very high, the used antenna of the embodiment of the invention can be realized high-gain at notebook, reaches the dipper system requirement.Complete machine has firm magnalium framework.For reinforced notebook computer, the magnalium framework is arranged, under the prerequisite that high-gain aerial has been installed, still keep the magnalium framework, make notebook very firm.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. a positioning antenna that is used for portable terminal device is characterized in that, comprising:
Compact frequency selective surface has the first resonance frequency and the second resonance frequency;
Microstrip antenna main body is arranged on described Compact frequency selective surface below, has the second characteristic information of the antenna directivity of first characteristic information of antenna directivity of corresponding described the first resonance frequency and corresponding described the second resonance frequency;
The high-gain radiation direction of described the first characteristic information is the normal orientation of described Compact frequency selective surface, and the high-gain radiation direction of described the second characteristic information is the tangential direction of described Compact frequency selective surface; Perhaps the high-gain radiation direction of described the second characteristic information is the normal orientation of described Compact frequency selective surface, and the high-gain radiation direction of described the first characteristic information is the tangential direction of described Compact frequency selective surface.
2. positioning antenna according to claim 1 is characterized in that, described microstrip antenna main body be shaped as thickness less than the flat pattern of length and width.
3. positioning antenna according to claim 1 is characterized in that, described Compact frequency selective surface is the flat board that is arranged with a plurality of holes, and described the first resonance frequency and described the second resonance frequency are determined by shape, size and the spacing in described a plurality of holes.
4. according to claim 1,2 or 3 described positioning antennas, it is characterized in that described the first resonance frequency is the corresponding operating frequency of Big Dipper navigation system, described the second resonance frequency is the corresponding operating frequency of global positioning system.
5. positioning antenna according to claim 4 is characterized in that, also comprises switching device shifter, is arranged on described microstrip antenna main body, is used for making described positioning antenna be operated in described the first resonance frequency and/or described the second resonance frequency.
6. positioning antenna according to claim 5 is characterized in that, described microstrip antenna main body comprises what order superposeed: reference metal ground floor, metal ground layer, dielectric-slab, two relative triangle metal radiation patch;
Described metal ground layer is printed on the lower surface of described dielectric-slab and connects described reference metal ground floor, and described Compact frequency selective surface covers described metal radiation paster top in the mode of insulation.
7. positioning antenna according to claim 6 is characterized in that, described switching device shifter is expansion paster and the switch that is arranged on described metal radiation paster.
8. a portable terminal device comprises main frame and the LCDs that is articulated in described main frame, it is characterized in that also comprise the positioning antenna that is arranged on the described LCDs back side, described positioning antenna comprises:
Compact frequency selective surface has the first resonance frequency and the second resonance frequency;
Microstrip antenna main body is arranged on described Compact frequency selective surface below, has the second characteristic information of the antenna directivity of first characteristic information of antenna directivity of corresponding described the first resonance frequency and corresponding described the second resonance frequency;
The high-gain radiation direction of described the first characteristic information is the normal orientation on plane, described LCDs place, and the high-gain radiation direction of described the second characteristic information is the tangential direction on plane, described LCDs place;
Perhaps, the high-gain radiation direction of described the second characteristic information is the normal orientation on plane, described LCDs place, and the high-gain radiation direction of described the first characteristic information is the tangential direction on plane, described LCDs place.
9. portable terminal device according to claim 8 is characterized in that, described microstrip antenna main body be shaped as thickness less than the flat pattern of length and width.
10. portable terminal device according to claim 9, it is characterized in that, described Compact frequency selective surface is the backboard of described LCDs, and described backboard is arranged with a plurality of holes, and described the first resonance frequency and described the second resonance frequency are determined by shape, size and the spacing in described a plurality of holes.
11. portable terminal device according to claim 8, it is characterized in that, described portable terminal device is mobile phone or notebook computer, and described the first resonance frequency is the corresponding operating frequency of Big Dipper navigation system, and described the second resonance frequency is the corresponding operating frequency of global positioning system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810105640 CN101572339B (en) | 2008-04-30 | 2008-04-30 | Positioning antenna for portable terminal and portable terminal thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810105640 CN101572339B (en) | 2008-04-30 | 2008-04-30 | Positioning antenna for portable terminal and portable terminal thereof |
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| CN101572339A CN101572339A (en) | 2009-11-04 |
| CN101572339B true CN101572339B (en) | 2013-03-27 |
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| CN 200810105640 Active CN101572339B (en) | 2008-04-30 | 2008-04-30 | Positioning antenna for portable terminal and portable terminal thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105357339B (en) * | 2015-10-20 | 2018-08-21 | 努比亚技术有限公司 | A kind of antenna |
| CN108963460B (en) * | 2018-07-13 | 2020-05-19 | 西安电子科技大学 | Active frequency selection surface unit, array and directional diagram reconfigurable antenna |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5892485A (en) * | 1997-02-25 | 1999-04-06 | Pacific Antenna Technologies | Dual frequency reflector antenna feed element |
| US6342866B1 (en) * | 2000-03-17 | 2002-01-29 | The United States Of America As Represented By The Secretary Of The Navy | Wideband antenna system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5892485A (en) * | 1997-02-25 | 1999-04-06 | Pacific Antenna Technologies | Dual frequency reflector antenna feed element |
| US6342866B1 (en) * | 2000-03-17 | 2002-01-29 | The United States Of America As Represented By The Secretary Of The Navy | Wideband antenna system |
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