CN103956588A - Pattern-reconfigurable antenna - Google Patents
Pattern-reconfigurable antenna Download PDFInfo
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- CN103956588A CN103956588A CN201410198621.5A CN201410198621A CN103956588A CN 103956588 A CN103956588 A CN 103956588A CN 201410198621 A CN201410198621 A CN 201410198621A CN 103956588 A CN103956588 A CN 103956588A
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Abstract
The invention provides a pattern-reconfigurable antenna which comprises an active oscillator connected with a feeder, a front passive oscillator and a rear passive oscillator, wherein the front passive oscillator and the rear passive oscillator are symmetrically arranged on the front side of the active oscillator and the rear side of the active oscillator respectively and are horizontally parallel to the active oscillator. The pattern-reconfigurable antenna is characterized in that the active oscillator is composed of two symmetrically arranged S-shaped active oscillator bodies, the end, located at the symcenter, of each S-shaped active oscillator body is narrower than the other end of each S-shaped active oscillator body; a lower passive oscillator parallel to the active oscillator is further arranged below the active oscillator, and a lower dielectric plate is arranged between the active oscillator and the lower passive oscillator. The antenna can achieve reconfiguration of an antenna pattern according to the requirements of a system, the radiation efficiency of the antenna is improved, unnecessary losses of energy are reduced, meanwhile the antenna has a low SAR value, backward radiation of the antenna can be reduced, and radiation to a human body can be lowered. The pattern-reconfigurable antenna has the advantages of being small in size, low in weight, easy to conform and the like and can be widely applied to mobile communication terminals and portable equipment at a low-frequency range.
Description
Technical field
The present invention relates to directional diagram reconstruct antenna technical field, be specially a kind of directional diagram reconstructable aerial.The present invention has realized the miniaturization of reconstructable microstrip aerial, can be used in the mobile communication equipments such as mobile phone and colony terminal.
Background technology
In recent years, fast development along with wireless communication technology, the effect of radio communication in people's life is more and more outstanding, the frequency spectrum resource of radio communication is day by day exhausted, in order to realize the multi-functional and ultra broadband of high Capacity Communication System, multiple-input, multiple-output (MultipleInput MultipleOutput, MIMO) technology starts to be widely studied and applies.Due to many antennas of MIMO Technology Need, so the structure of communication system can become complicated, and the mutual coupling meeting between antenna brings the problem of electromagnetic compatibility aspect, increases system development difficulty and cost.Phased array antenna technology is relatively ripe, but has the shortcomings such as expensive and high-tech difficulty that feeding network is complicated, need increase phase shifter and cause thus, and under this background, reconfigurable antenna arises at the historic moment.Reconfigurable antenna can be divided into frequency reconfigurable antenna, directional diagram reconstructable aerial, frequency and directional diagram reconfigurable antenna, polarization reconfigurable antenna etc. simultaneously according to function.Concrete methods of realizing is in antenna radiator, to load variable capacitance diode, RF-PIN or mems switch, changes the radiation characteristic of antenna by the state of control switch, makes an antenna have the function of multiple antenna.Reconfigurable antenna for improving capability of wireless communication system, expanding system function, increase system works bandwidth, realize the aspects such as software radio important technical guarantee is provided, will bring far-reaching influence to wireless communication technology.
At present, most of reconfigurable antenna of studying has only been realized the reconstruct of the specific character in directional diagram, frequency and polarization mode, mixes reconfigurable antenna because variable element is more, therefore realizes more difficult.But along with people are more and more to the demand of wireless communication technology, the function of radio communication terminal can get more and more, working frequency range also can be more and more wider, mix the appearance of reconstruct antenna, not only can effectively reduce the radiation of antenna to human body, and can realize the broadband operation of antenna, the multifunction of wireless terminal product is had to real meaning, therefore, directional diagram reconstructable antenna for mobile phone has huge market using value, so the miniature antenna of design direction figure reconfigurable function has great importance to increasing the practicality of antenna.
Summary of the invention
The object of the present invention is to provide a kind of directional diagram reconstructable aerial.By controlling the on off state of mems switch 201, realize the reconstruct of antenna pattern, reduce directional diagram towards the gain on people side, reduce the radiation of antenna to human body, reduce the unnecessary loss of antenna energy, improve the utilance of antenna energy.This antenna can use on the portable equipments such as the mobile terminal of low-frequency range or colony terminal.
The technical solution adopted in the present invention:
A kind of directional diagram reconstructable aerial, comprise the active dipole 101 being connected with feeder line 401 and be symmetricly set in respectively active dipole 101 both sides, front and back and with front parasitic element 102 and the rear parasitic element 103 of active dipole 101 horizontal parallel, it is characterized in that: described active dipole 101 is comprised of two symmetrically arranged snakelike active dipoles, it is narrower that snakelike active dipole is positioned at one end of symmetrical centre, and the other end is wider; Below active dipole 101, being also provided with a lower parasitic element 105 parallel with active dipole 101, is lower dielectric-slab 302 between active dipole 101 and lower parasitic element 105.
Wherein, above active dipole, be also provided with the upper parasitic element parallel with active dipole 104 active dipoles 101.
Wherein, be provided with 2 mems switches 201 on described upper parasitic element 104, these 2 mems switch 201 positions are with respect to upper parasitic element 104 Central Symmetry settings.
Wherein, the length of described active dipole 101 is 0.26 times of wavelength, and the length of upper parasitic element 104 is 0.19 times of wavelength.
Wherein, be provided with 2 mems switches 201 on described lower parasitic element 105, these 2 mems switch 201 positions are with respect to lower parasitic element 105 Central Symmetry settings.
Wherein, on described front parasitic element 102 and rear parasitic element 103, be respectively provided with 3 mems switches 201, one of them mems switch 201 is positioned at the center of parasitic element 102,103, and another two mems switches 201 are with respect to these parasitic element 102,103 Central Symmetry settings.
Wherein, it between active dipole 101 and upper parasitic element 104, is upper dielectric-slab 301, between active dipole 101 and lower parasitic element 105, be lower dielectric-slab 302, upper dielectric-slab 301 is identical with lower dielectric-slab 302 materials, and active dipole 101 all buries between upper dielectric-slab 301 and lower dielectric-slab 302.
Wherein, the spacing between described active dipole 101 and the spacing between front parasitic element 102 and active dipole 101 and rear parasitic element 103 is 0.064 times of wavelength; Spacing between described active dipole 101 and the spacing between upper parasitic element 104 and active dipole 101 and lower parasitic element 105 is 0.0085 times of wavelength.
Wherein, the drift angle that the wide end of snakelike active dipole 101 is corresponding with narrow end line is 5.8 degree.
The present invention has following advantage and characteristic with respect to prior art:
(1) adopt the stacked band Yagi antenna structure that declines, antenna pattern control is more flexible, improves capacity usage ratio, reduces the radiation of antenna to human body, and antijamming capability is strong.
(2) antenna active dipole adopts serpentine configuration, buries in medium, has effectively reduced antenna size, has expanded antenna applications scope.
(3) antenna structure is symmetrical, and structural parameters are easy to adjust, and antenna adjustment is simple, is easy to processing.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the vertical view of Fig. 1.
Embodiment
Current, reconfigurable antenna is also in the exploratory stage, and such antenna can be realized the variation of antenna pattern, polarization mode and working frequency range by loading technique, have the function that common antenna is realized multiple antenna, can effectively reduce antenna volume, reduce development cost.Wherein, the antenna of directional diagram reconstructable can need to be realized the reconstruct of directional diagram according to mobile terminal, improves antenna radiation efficiency, reduces the unnecessary loss of energy, can reduce antenna backward radiation simultaneously, has low SAR value characteristic, reduces human body radiation.The features such as it is little that the present invention has volume, lightweight, can be applied in mobile communication terminal and portable equipment widely.
Below in conjunction with accompanying drawing, for example concrete structure of the present invention is further described.
Embodiment 1:
As depicted in figs. 1 and 2, a kind of directional diagram reconstructable aerial of the present invention.Wherein, comprise the active dipole 101 being connected with feeder line 401 and be symmetricly set in respectively active dipole 101 both sides, front and back and with front parasitic element 102 and the rear parasitic element 103 of active dipole 101 horizontal parallel, described active dipole 101 is comprised of two symmetrically arranged snakelike active dipoles, it is narrower that snakelike active dipole is positioned at one end of symmetrical centre, and the other end is wider; The drift angle that the wide end of snakelike active dipole 101 is corresponding with narrow end line is 5.8 degree; Below active dipole, be also provided with a lower parasitic element 105 parallel with active dipole, the length of active dipole 101 is 0.26 times of wavelength, and the length of lower parasitic element 105 is 0.19 times of wavelength; On front parasitic element 102 and rear parasitic element 103, be respectively provided with 3 mems switches 201, one of them mems switch 201 is positioned at the center of parasitic element 102 and parasitic element 103, and another two mems switches 201 are respectively with respect to parasitic element 102 and parasitic element 103 Central Symmetry settings; On lower parasitic element 105, be provided with 2 mems switches 201, these 2 mems switch 201 positions are with respect to lower parasitic element 105 Central Symmetry settings, change antenna mems switch 201 states, just can realize the reconstruct of antenna pattern, select suitable size, just can meet the demand of required frequency range impedance bandwidth and directional diagram.
Described a kind of directional diagram reconstructable aerial, the snakelike active dipole 101 of this antenna, front parasitic element 102 and rear parasitic element 103 are printed on medium substrate 302 upper surfaces, lower parasitic element 105 is printed on the lower surface of medium substrate 302, form stacked structure with snakelike active dipole 101, the material of medium substrate 302 can be changed according to different application occasion, snakelike active dipole 101 is connected with balancer 401, and in reality, balancer is realized by metal printed line.
Described a kind of directional diagram reconstructable aerial, disconnection (or closed) by mems switch 201, control the closure (or disconnection) of front parasitic element 102 and the disconnection (or closed) of rear parasitic element 103, make front parasitic element 102 be operated in reflection oscillator (or director dipole) state, make rear parasitic element 103 be operated in director dipole (or reflection oscillator) state, the reconstruct in the horizontal direction of control antenna directional diagram; By the disconnection (or closed) of mems switch 201, control the disconnection (or closed) of lower parasitic element 105, make lower parasitic element 105 be operated in director dipole (or reflection oscillator) state, the reconstruct in the vertical direction of control antenna directional diagram; Control whole mems switches 201 simultaneously, can realize omnidirectional's reconstruct of antenna pattern.
Embodiment 2:
As depicted in figs. 1 and 2, another kind of embodiment of the present invention is on the basis of embodiment 1,2 mems switches on lower parasitic element have been deleted, 201 are adding dielectric-slab 301 and upper parasitic element 104 above active dipole 101, upper dielectric-slab 301 is identical with lower dielectric-slab 302 materials.Upper parasitic element 104 is printed on 301 upper surface of medium substrate, and active dipole 101, front parasitic element 102 and rear parasitic element 103 all bury between upper dielectric-slab 301 and lower dielectric-slab 302.Upper parasitic element 104 is symmetrical in respectively the upper and lower both sides of active dipole and parallel with snakelike active dipole 101 with lower parasitic element 105, and the length of upper parasitic element 104 is 0.09 times of wavelength; The length of lower parasitic element 105 is 0.19 times of wavelength.
Described a kind of directional diagram reconstructable aerial, because active dipole 101 buries between upper dielectric-slab 301 and lower dielectric-slab 302, so effectively reduced the dimensional structure of antenna; Upper parasitic element 104 length are less than snakelike active dipole 101, and upper parasitic element 104 is operated in director dipole state; Lower parasitic element 105 length are greater than snakelike active dipole 101, lower parasitic element 105 is operated in reflection oscillator state, antenna pattern is positioned at upper half-space in vertical direction, can adjust according to communication requirement the length of parasitic element 104 and lower parasitic element 105 on antenna, can change the beamwidth of antenna pattern in vertical plane, the directivity of the antenna pattern of this application example strengthens, and energy is more concentrated, has improved the utilance of antenna energy; Owing to having reduced mems switch, so complexity and the cost of the antenna reducing.
Embodiment 3:
As depicted in figs. 1 and 2, another kind of embodiment of the present invention is on the basis of embodiment 2, is provided with 2 mems switches 201 on upper parasitic element 104, and these 2 mems switch 201 positions are with respect to upper parasitic element 104 Central Symmetry settings; On lower parasitic element 105, be provided with 2 mems switches 201, these 2 mems switch 201 positions are with respect to lower parasitic element 105 Central Symmetry settings; The length of upper parasitic element 104 is 0.19 times of wavelength; The length of lower parasitic element 105 is 0.19 times of wavelength.
Described a kind of directional diagram reconstructable aerial, disconnection (or closed) by mems switch 201, control the disconnection (or closed) of front upper parasitic element 104 and the closure (or disconnection) of lower parasitic element 105, make parasitic element 104 be operated in director dipole (or reflection oscillator) state, make lower parasitic element 105 be operated in director dipole (or reflection oscillator) state, the reconstruct in the vertical direction of control antenna directional diagram; Control whole mems switches 201 simultaneously, can realize omnidirectional's reconstruct of antenna pattern, owing to having increased mems switch, the control of antenna pattern is more flexible, according to antenna parameter demand, adjust antenna size, just can meet the demand of the directional diagram reconstruct of arrowband frequency range.
Claims (9)
1. a directional diagram reconstructable aerial, comprise the active dipole (101) being connected with feeder line (401) and be symmetricly set in respectively both sides before and after active dipole (101) and with front parasitic element (102) and the rear parasitic element (103) of active dipole (101) horizontal parallel, it is characterized in that: described active dipole (101) is comprised of two symmetrically arranged snakelike active dipoles, it is narrower that snakelike active dipole is positioned at one end of symmetrical centre, and the other end is wider; Below active dipole, be also provided with a lower parasitic element (105) parallel with active dipole.
2. a kind of directional diagram reconstructable aerial according to claim 1, is characterized in that: in the top of active dipole (101), be also provided with a upper parasitic element (104) parallel with active dipole.
3. a kind of directional diagram reconstructable aerial according to claim 2, it is characterized in that: between active dipole (101) and upper parasitic element (104), be upper dielectric-slab (301), between active dipole (101) and lower parasitic element (105), be lower dielectric-slab (302), upper dielectric-slab (301) is identical with lower dielectric-slab (302) material, and active dipole (101) all buries between upper dielectric-slab (301) and lower dielectric-slab (302).
4. a kind of directional diagram reconstructable aerial according to claim 2, it is characterized in that: on described upper parasitic element (104), be provided with 2 mems switches (201), this 2 mems switches (201) position is with respect to upper parasitic element (104) Central Symmetry setting.
5. a kind of directional diagram reconstructable aerial according to claim 2, is characterized in that: the length of described active dipole (101) is 0.26 times of wavelength, and the length of upper parasitic element (104) is 0.19 times of wavelength.
6. a kind of directional diagram reconstructable aerial according to claim 1, it is characterized in that: on described lower parasitic element (105), be provided with 2 mems switches (201), this 2 mems switches (201) position is with respect to lower parasitic element (105) Central Symmetry setting.
7. a kind of directional diagram reconstructable aerial according to claim 1, it is characterized in that: on described front parasitic element (102) and rear parasitic element (103), be respectively provided with 3 mems switches (201), one of them mems switch (201) is positioned at the center of parasitic element (102,103), and another two mems switches (201) are with respect to this parasitic element (102,103) Central Symmetry setting.
8. a kind of directional diagram reconstructable aerial according to claim 2, is characterized in that: it is 0.064 times of wavelength that the spacing between the spacing between described active dipole (101) and front parasitic element (102) and active dipole (101) and rear parasitic element (103) is; Spacing between spacing between described active dipole (101) and upper parasitic element (104) and active dipole (101) and lower parasitic element (105) is 0.0085 times of wavelength.
9. a kind of directional diagram reconstructable aerial according to claim 1, is characterized in that: the drift angle that the wide end of snakelike active dipole (101) is corresponding with narrow end line is 5.8 degree.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410198621.5A CN103956588A (en) | 2014-05-12 | 2014-05-12 | Pattern-reconfigurable antenna |
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| CN201410198621.5A CN103956588A (en) | 2014-05-12 | 2014-05-12 | Pattern-reconfigurable antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193145A (en) * | 2018-09-11 | 2019-01-11 | 哈尔滨工业大学 | A kind of light-operated directional diagram reconstructable yagi aerial of printed form working in UHF waveband |
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| CN109193145A (en) * | 2018-09-11 | 2019-01-11 | 哈尔滨工业大学 | A kind of light-operated directional diagram reconstructable yagi aerial of printed form working in UHF waveband |
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Application publication date: 20140730 |