CN103474757A - Antenna system - Google Patents
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- CN103474757A CN103474757A CN2013104137314A CN201310413731A CN103474757A CN 103474757 A CN103474757 A CN 103474757A CN 2013104137314 A CN2013104137314 A CN 2013104137314A CN 201310413731 A CN201310413731 A CN 201310413731A CN 103474757 A CN103474757 A CN 103474757A
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Abstract
The embodiment of the invention discloses an antenna system, and relates to the field of communication. The broadband and miniaturization of the antenna system are achieved at the same time. The antenna system comprises a metal earth plate, a dielectric plate, two power dividers, two phase shifters and a radiating body, wherein the metal earth plate is connected with the dielectric layer, the two power dividers and the two phase shifters are located on the dielectric plate, and the radiating body is respectively connected with the metal earth plate and the phase shifters. The radiating body comprises a radiating metal plate, a metal column and four L-type probes, wherein the metal column is respectively and electrically connected with the metal earth plate and a radiating metal plate, the four L-type probes form a quadrangle, and the two diagonal lines of the quadrangle are respectively parallel to the two diagonal lines of the radiating metal plate. Each of the four L-type probes comprises a metal feeder pillar and a metal feeder panel. One end of each metal feeder pillar is connected with one phase shifter. The other ends of the metal feeder pillars are connected with the metal feeder panels. The metal feeder panels of the L-type probes on at least one diagonal line of the quadrangle are parallel to the radiating metal plate.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of antenna system.
Background technology
Along with the fast development of wireless communication technology, antenna system is also more and more higher to broadband requirement.The main design thought of broadband antenna system is difference independent design antenna radiation unit and feeding network.Analysis based on the Principle of Antenna structure can be found, the broadband antenna system that generally all is based on larger volume of antenna system realizes, as everyone knows, the antenna system of traditional macro base station is also brought greatly and difficulty is installed, addressing is difficult and safeguards the problems such as inconvenient just because of its volume.
Therefore, how to realize the broadband and miniaturization of antenna system simultaneously, become the important topic of those skilled in the art's research.
Summary of the invention
Embodiments of the invention provide a kind of antenna system, have realized the broadband and miniaturization of antenna system simultaneously.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A first aspect of the present invention, a kind of antenna system is provided, comprise: interconnective metal ground plate and dielectric-slab, and be positioned at two power splitters and two phase shifters on described dielectric-slab, and the radiant body be connected respectively with described phase shifter with described metal ground plate;
Wherein, described two power splitters are respectively used to produce the signal transmission that the two-way amplitude is identical and phase place is identical; The described two-way amplitude signal transmission identical and that phase place is identical that described two phase shifters are respectively used to that described power splitter is produced is converted to the identical but signal transmission of single spin-echo of two-way amplitude;
Wherein, described radiant body comprises: the radiation metal plate, metal column, four L-type probes, described metal column is electrically connected with described metal ground plate and described radiation metal plate respectively, described four L-type probes form a quadrangle, and described tetragonal two diagonal are parallel with two diagonal of described radiation metal plate respectively; Each L-type probe in described four L-type probes comprises metal feeder pillar and metal feed flat board, for described radiation metal plate is carried out to feed, one end of described metal feeder pillar is connected with described phase shifter, the other end is connected with described metal feed is dull and stereotyped, and the described metal feed that the described L-type probe on described tetragonal at least one diagonal comprises is dull and stereotyped parallel with described radiation metal plate.
In conjunction with first aspect, in a kind of possible implementation, described radiation metal plate is square.
In conjunction with first aspect and above-mentioned possible implementation, at another kind, in possible implementation, the described metal feeder pillar that the described L-type probe on described tetragonal at least one diagonal that described four L-type probes form comprises is vertical with described radiation metal plate.
In conjunction with first aspect and above-mentioned possible implementation, at another kind in possible implementation, between the dull and stereotyped and described radiation metal plate of the described metal feed that the described L-type probe on described tetragonal at least one diagonal that described four L-type probes form comprises, be provided with gap.
In conjunction with first aspect and above-mentioned possible implementation, at another kind, in possible implementation, the described metal feed that the described L-type probe on described tetragonal at least one diagonal that described four L-type probes form comprises is dull and stereotyped for square.
In conjunction with first aspect and above-mentioned possible implementation, at another kind, in possible implementation, described power splitter comprises main transmission line, for input signal being divided into to the two-way signal transmission; Two first branch's transmission lines, two second branch's transmission lines, one end of described two first branch's transmission lines connects respectively the two ends of described main transmission line, the other end of described two first branch's transmission lines connects respectively an end of described two second branch's transmission lines, the other end of described two second branch's transmission lines connects respectively described phase shifter, and signal transmission that phase place identical identical for generation of the two-way amplitude.
In conjunction with first aspect and above-mentioned possible implementation, at another kind in possible implementation, the length of every first branch's transmission line in described two first branch's transmission lines be respectively every described the first transmission line institute of branch signal transmission wavelength 1/4th.
In conjunction with first aspect and above-mentioned possible implementation, at another kind in possible implementation, described phase shifter comprises the first transmission line, the second transmission line and the 3rd transmission line, and described the first transmission line and described the second transmission line are for exporting the identical but signal transmission of single spin-echo of two-way amplitude; Wherein, the transmission line that described the first transmission line is linear phase, described the second transmission line and described the 3rd transmission line form the transmission line of nonlinear phase;
One end of described the first transmission line connects described power splitter, and the other end connects described radiant body; One end of described the second transmission line connects described power splitter, and the other end connects described radiant body; One end of described the 3rd transmission line is connected on the second transmission line, other end open circuit or short circuit.
In conjunction with first aspect and above-mentioned possible implementation, at another kind in possible implementation, 1/4th of the wavelength that the length of described the 3rd transmission line is described the 3rd transmission line institute signal transmission.
The antenna system that the embodiment of the present invention provides, comprise interconnective metal ground plate and dielectric-slab, and be positioned at two power splitters and two phase shifters on dielectric-slab, and the radiant body be connected respectively with phase shifter with metal ground plate, this radiant body comprises: the radiation metal plate, metal column, four L-type probes, by the air between radiation metal plate and metal ground plate and dielectric-slab as dielectric layer, realize take the micro-strip paster antenna structure that the radiation metal plate is metal patch, thereby realized the miniaturization of antenna system.By power splitter, phase shifter, and four L-type probes that comprise metal feeder pillar and metal feed flat board carry out feed in the mode of 4 coupling feeds to the radiation metal plate, make the radiant body of antenna system there is wider impedance bandwidth, and then contribute to realize the broadband of antenna system, and then realized the broadband and miniaturization of antenna system simultaneously.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation of a kind of antenna system that Fig. 1 provides for the embodiment of the present invention;
The vertical view of a kind of antenna system that Fig. 2 provides for the embodiment of the present invention;
The end view of a kind of antenna system that Fig. 3 provides for the embodiment of the present invention;
The structural representation of a kind of power splitter that Fig. 4 provides for the embodiment of the present invention;
The structural representation of a kind of phase shifter that Fig. 5 provides for the embodiment of the present invention;
The reflection coefficient curve of four ports under a kind of application scenarios that four metal feeder pillars in four L-type probes of the radiant body in the antenna system that Fig. 6 provides for the embodiment of the present invention are connected with phase shifter;
The S parameter curve of power splitter under a kind of application scenarios in the antenna system that Fig. 7 provides for the embodiment of the present invention;
The phase difference that phase shifter in the antenna system that Fig. 8 provides for the embodiment of the present invention produces under a kind of application scenarios with frequency variation curve;
The two-dimensional directional figure of antenna system under a kind of application scenarios that Fig. 9 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of structure chart of antenna system, as shown in Figure 1, this antenna system can comprise: interconnective metal ground plate 10 and dielectric-slab 20, and be positioned at 31,32 and two phase shifters 41,42 of two power splitters on dielectric-slab 20, and the radiant body be connected respectively with phase shifter 41,42 with metal ground plate 10.
Exemplary, shown in Figure 1, dielectric-slab 20 covers the upper surface of metal ground plate 10, power splitter 31 and power splitter 32 cover respectively the upper surface of dielectric-slab 20, phase shifter 41 and phase shifter 42 cover respectively the upper surface of dielectric-slab 20, the structure that this power splitter and phase shifter all cover on dielectric-slab 20 is called microstrip line construction, has advantages of miniaturization.
Wherein, two power splitters 31,32 are respectively used to produce the signal transmission that the two-way amplitude is identical and phase place is identical; The two-way amplitude signal transmission identical and that phase place is identical that two phase shifters 41,42 are respectively used to that power splitter is produced is converted to that the two-way amplitude is identical but then the signal transmission of single spin-echo exports radiant body to.
Exemplary, shown in Figure 1, power splitter 31 is connected with phase shifter 41, that is to say that identical and signal transmission single spin-echo is converted to the identical but signal transmission of single spin-echo of two-way amplitude to phase shifter 41 for two-way amplitude that power splitter 31 is produced, same, power splitter 32 is connected with phase shifter 42, that is to say that identical and signal transmission single spin-echo is converted to the identical but signal transmission of single spin-echo of two-way amplitude to phase shifter 42 for two-way amplitude that power splitter 32 is produced.
Wherein, radiant body comprises: radiation metal plate 501, metal column 502, four L- type probes 5031,5032,5033,5034, the two ends of metal column 502 are electrically connected with metal ground plate 10 and radiation metal plate 501 respectively, four L- type probes 5031,5032,5033,5034 form a quadrangle, and tetragonal two diagonal are parallel with two diagonal of radiation metal plate 501 respectively; Each L-type probe in four L- type probes 5031,5032,5033,5034 comprises metal feeder pillar and metal feed flat board, for radiation metal plate 501 is carried out to feed, one end of metal feeder pillar is connected with phase shifter, the other end is connected with the metal feed is dull and stereotyped, and the metal feed that the L-type probe on tetragonal at least one diagonal comprises is dull and stereotyped parallel with radiation metal plate 501.
Exemplary, with reference to the vertical view of the antenna system shown in Fig. 1-2, four L-type probes are L-type probe 5031, L-type probe 5032, L-type probe 5033 and L-type probe 5034.Wherein, L-type probe 5031 comprises metal feeder pillar 5031a and the dull and stereotyped 5031b of metal feed, L-type probe 5032 comprises metal feeder pillar 5032a and the dull and stereotyped 5032b of metal feed, L-type probe 5033 comprises metal feeder pillar 5033a and the dull and stereotyped 5033b of metal feed, L-type probe 5034 comprises metal feeder pillar 5034a and the dull and stereotyped 5034b of metal feed, and L-type probe 5031, L-type probe 5032, L-type probe 5033 and L-type probe 5034 form a quadrangle, and tetragonal two diagonal that form are parallel with two diagonal of radiation metal plate 501 respectively, and the metal feed that the L-type probe on tetragonal at least one diagonal comprises is dull and stereotyped parallel with radiation metal plate 501, formed tetragonal in, L-type probe on diagonal can be L-type probe 5031 and L-type probe 5033, perhaps L-type probe 5032 and L-type probe 5034, that is to say that so the dull and stereotyped 5031b of metal feed is all parallel with radiation metal plate 501 with the dull and stereotyped 5033b of metal feed, and/or, the dull and stereotyped 5032b of metal feed is all parallel with radiation metal plate 501 with the dull and stereotyped 5034b of metal feed.
And, exemplary, shown in Fig. 1-2, two outputs of phase shifter 41 connect respectively the end of the metal feeder pillar 5031a that L-type probe 5031 comprises and the end of the metal feeder pillar 5033a that L-type probe 5033 comprises, two outputs of phase shifter 42 connect respectively the end of the metal feeder pillar 5032a that L-type probe 5032 comprises and the end of the metal feeder pillar 5034a that L-type probe 5034 comprises, the other end of metal feeder pillar 5031a is connected with the dull and stereotyped 5031b of metal feed, the other end of metal feeder pillar 5032a is connected with the dull and stereotyped 5032b of metal feed, the other end of metal feeder pillar 5033a is connected with the dull and stereotyped 5033b of metal feed, the other end of metal feeder pillar 5034a is connected with the dull and stereotyped 5034b of metal feed, the two-way amplitude that phase shifter 41 is exported like this is identical but signal transmission single spin-echo can be inputted metal feeder pillar 5031a and metal feeder pillar 5033a, then just can carry out differential feed to radiation metal plate 501 by the dull and stereotyped 5031b of metal feed and the dull and stereotyped 5033b of metal feed, the two-way amplitude of phase shifter 42 outputs is identical but signal transmission single spin-echo can be inputted metal feeder pillar 5032a and metal feeder pillar 5034a, then just can carry out differential feed to radiation metal plate 501 by the dull and stereotyped 5032b of metal feed and the dull and stereotyped 5034b of metal feed.
Wherein, the end view of antenna system shown in Figure 3, be understandable that, the radiation metal plate 501 that radiant body is comprised and the air between metal ground plate 10 and dielectric-slab 20 are as dielectric layer, just can realize take the micro-strip paster antenna that radiation metal plate 501 is metal patch, the sectional thickness of this micro-strip paster antenna structure is lower than traditional base station antenna die-casting a period of time, and then realized the miniaturization of antenna system.And the two-way amplitude of exporting referring to Fig. 1 phase shifter 41 is identical but signal transmission single spin-echo is inputted metal feeder pillar 5031a and metal feeder pillar 5033a, the two-way amplitude of phase shifter 42 outputs is identical but signal transmission single spin-echo is inputted metal feeder pillar 5032a and metal feeder pillar 5034a, so just, can be by excitation metal feeder pillar 5031a, metal feeder pillar 5032a, metal feeder pillar 5033a and metal feeder pillar 5034a, make the dull and stereotyped 5031b of metal feed, the dull and stereotyped 5032b of metal feed, the dull and stereotyped 5034b of the dull and stereotyped 5033b of metal feed and metal feed is to radiation metal plate 501 feed that is coupled, this 4 coupling feed ways make radiant body have wider impedance bandwidth, thereby contribute to realize the broadband of antenna system.And, due to the identical but single spin-echo of the signal transmission amplitude of metal feeder pillar 5031a and metal feeder pillar 5033a input, so just, can carry out the anti-phase feed of constant amplitude to the dull and stereotyped 5031b of metal feed and the dull and stereotyped 5033b of metal feed, produce+45 degree polarized radiations, but single spin-echo identical due to the signal transmission amplitude of metal feeder pillar 5032a and metal feeder pillar 5034a input simultaneously, can carry out the anti-phase feed of constant amplitude to the dull and stereotyped 5032b of metal feed and the dull and stereotyped 5034b of metal feed like this, produce-45 degree polarized radiations, thereby formation dual polarized antenna, feeding classification effectively reduces the electromagnetism mutual coupling between two L-type probes on the quadrangle diagonal like this, thereby improved cross polarization discrimination (the cross polarization discrimination of antenna, XPD) performance.
Optionally, radiation metal plate 501 is square.
Wherein, the radiation metal plate 501 that radiant body comprises can be square, can effectively reduce like this deterioration of antenna system degree of polarization.Be understandable that, when radiation metal plate 501 is square, due to four L- type probes 5031, 5032, 5033, 5034 tetragonal two diagonal that form are parallel with two diagonal of radiation metal plate 501 respectively, that is to say so, four L- type probes 5031, 5032, 5033, the metal feed that in 5034, two adjacent L-type probes comprise is dull and stereotyped mutually vertical, exemplary, as shown in Figure 2, the dull and stereotyped 5032b of metal feed that the dull and stereotyped 5031b of the metal feed that L-type probe 5031 comprises comprises with L-type probe 5032 is mutually vertical, the dull and stereotyped 5033b of metal feed that the dull and stereotyped 5032b of the metal feed that L-type probe 5032 comprises comprises with L-type probe 5033 is mutually vertical, the dull and stereotyped 5034b of metal feed that the dull and stereotyped 5033b of the metal feed that L-type probe 5033 comprises comprises with L-type probe 5034 is mutually vertical, the dull and stereotyped 5031b of metal feed that the dull and stereotyped 5034b of the metal feed that L-type probe 5034 comprises comprises with L-type probe 5031 is mutually vertical, that is to say between adjacent metal feed flat board mutually vertical, reduced like this electromagnetism mutual coupling between adjacent metal feed flat board, thereby improved the isolation characteristic of four feed port.
Optionally, the metal feeder pillar that the L-type probe on tetragonal at least one diagonal of four L- type probe 5031,5032,5033,5034 formations comprises is vertical with radiation metal plate 501.
Exemplary, four L-type probes can be L-type probe 5031, L-type probe 5032, L-type probe 5033 and L-type probe 5034, these four L- type probes 5031, 5032, 5033, 5034 form a quadrangle, and form tetragonal in, L-type probe on diagonal can be L-type probe 5031 and L-type probe 5033, perhaps L-type probe 5032 and L-type probe 5034, that is to say that metal feeder pillar 5031a is all vertical with radiation metal plate 501 with metal feeder pillar 5033a, and/or, metal feeder pillar 5032a is all vertical with radiation metal plate 501 with metal feeder pillar 5034a, can further reduce the deterioration of antenna system degree of polarization like this.
Optionally, between the metal feed flat board that the L-type probe on tetragonal at least one diagonal of four L- type probe 5031,5032,5033,5034 formations comprises and radiation metal plate 501, be provided with gap.
Exemplary, as shown in Figure 3, four L- type probes 5031, 5032, 5033, be provided with gap between the metal feed flat board that L-type probe on 5034 tetragonal at least one diagonal that form comprises and radiation metal plate 501, specifically for example, four L-type probes can be L-type probe 5031, L-type probe 5032, L-type probe 5033 and L-type probe 5034, these four L- type probes 5031, 5032, 5033, 5034 form a quadrangle, and form tetragonal in, L-type probe on diagonal can be L-type probe 5031 and L-type probe 5033, perhaps L-type probe 5032 and L-type probe 5034, that is to say that the dull and stereotyped 5031b of metal feed and the dull and stereotyped 5033b of metal feed all and between radiation metal plate 501 are provided with gap, and/or, the dull and stereotyped 5032b of metal feed and the dull and stereotyped 5034b of metal feed all and between radiation metal plate 501 are provided with gap, the scope in this gap can be: be less than or equal to 0.12 wavelength, wherein this wavelength refers to the electromagnetic wavelength that operating frequency is corresponding.
Optionally, the metal feed that the L-type probe on tetragonal at least one diagonal of four L- type probe 5031,5032,5033,5034 formations comprises is dull and stereotyped for square.
Exemplary, as shown in Figure 2, four L-type probes can be L-type probe 5031, L-type probe 5032, L-type probe 5033 and L-type probe 5034, and the L-type probe on diagonal can be L-type probe 5031 and L-type probe 5033, or L-type probe 5032 and L-type probe 5034.
Optionally, power splitter 31, power splitter 32 comprise respectively main transmission line 301, for input signal being divided into to the two-way signal transmission; Two first branch's transmission lines 302, two second branch's transmission lines 303, one end of two first branch's transmission lines 302 connects respectively the two ends of main transmission line 301, the other end of two first branch's transmission lines 302 connects respectively an end of two second branch's transmission lines 303, the other end of two second branch's transmission lines 303 connects respectively phase shifter, and signal transmission that phase place identical identical for generation of the two-way amplitude.
Exemplary, as shown in Figure 4, the power splitter 31 of take is introduced as example, power splitter 31 comprises main transmission line 301, two first branch's transmission lines 302 can be the first transmission line 302a of branch and the first transmission line 302b of branch, and two second branch's transmission lines 303 can be the second transmission line 303a of branch and the second transmission line 303b of branch.Concrete annexation can be: an end of main transmission line 301 is connected with the end of the first transmission line 302a of branch, the other end is connected with the end of the first transmission line 302b of branch, the other end of the first transmission line 302a of branch is connected with the end of the second transmission line 303a of branch, the other end of the first transmission line 302b of branch is connected with the end of the second transmission line 303b of branch, and the other end of the other end of the second transmission line 303a of branch and the second transmission line 303b of branch is connected with phase shifter 41 respectively.This power splitter 31 also comprises an input port A1, two output port A2, A3.Input port A1 is positioned on main transmission line 301, and output port A2, A3 lay respectively at the end of the second transmission line 303a of branch and the second transmission line 303b of branch.
Wherein, input signal is after input port A1 input, be divided into the two-way signal transmission after main transmission line 301, wherein a road signal transmission exports phase shifter 41 to from output port A2 after the first transmission line 302a of branch and the second transmission line 303a of branch, and another road signal transmission exports phase shifter 41 to from output port A3 after first branch's transmission line and the second transmission line 303b of branch.First branch's transmission line 302 is different from the length of second branch's transmission line 303, width is also different, can go out to form the second order impedance transformation at plane of reference T1 and T2 like this, utilize this stepped impedance transformation transmission line can realize the high-order impedance transformation, thereby spread bandwidth, the two-way signal transmission of exporting from main transmission line 301 like this is after through first branch's transmission line 302 and second branch's transmission line 303, at the reflected wave at plane of reference T0 place with the stack that disappears mutually of certain phase difference, thereby make reflected wave keep less value in broad frequency band, the impedance that realizes power splitter is broadband, thereby contribute to further to realize the broadband of antenna system.
Need to illustrate, comprising power splitter 32 formations in the embodiment of the present invention all can be with reference to the formation shown in figure 4.
Optionally, the length of every first branch's transmission line in two first branch's transmission lines 302 can be 1/4th of the wavelength of every the first transmission line institute of branch signal transmission.
Optionally, phase shifter 41, phase shifter 42 comprise that respectively the first transmission line 401, the second transmission lines 402 and the 3rd transmission line 403, the first transmission lines 401 and the second transmission line 402 are for exporting the identical but signal transmission of single spin-echo of two-way amplitude; Wherein, the transmission line that the first transmission line 401 is linear phase, the second transmission line 402 and the 3rd transmission line 403 form the transmission line of nonlinear phase; One end of the first transmission line 401 connects power splitter, and the other end connects radiant body; One end of the second transmission line 402 connects power splitter, and the other end connects radiant body; One end of the 3rd transmission line 403 is connected on the second transmission line 402, other end open circuit or short circuit.
Exemplary, as shown in Figure 5, think and be introduced with phase shifter 41, phase shifter 41 comprises the first transmission line 401, it has two port C1, C4, the second transmission line 402, it has two port C2, C3, simultaneously with reference to figure 4, the output port A3 of power splitter 31 can be connected with port C1, the output port A2 of power splitter 31 can be connected with port C2, simultaneously with reference to figure 1 by port C3, identical but signal transmission single spin-echo of the two-way amplitude of C4 output can output in the metal feeder pillar that two L-type probes on the quadrangle diagonal that radiant body comprises comprise, and an end of the 3rd transmission line 403 is connected on the second transmission line 402, other end open circuit or short circuit, wherein the other end of the 3rd transmission line 403 is opened a way, the other end that can refer to the 3rd transmission line 403 is unsettled, one end of the 3rd transmission line 403 is connected on the second transmission line 402, other end short circuit, the two ends that can refer to the 3rd transmission line 403 are connected on the diverse location of the second transmission line 402, for example, the 3rd transmission line 403 and the second transmission line 402 can be formed to T-shaped structure.What certainly can understand is, the antenna system that the embodiment of the present invention provides comprises two phase shifters 41,42, identical but the signal transmission of single spin-echo of the amplitude of two phase shifters, 41,42 outputs, be respectively used to export in the metal feeder pillar that two L-type probes on two diagonal of quadrangle comprise.
Wherein, by the 3rd transmission line 403 1 ends are connected on the second transmission line 402, other end open circuit or short circuit, make the signal of transmission in the second transmission line 402 there is nonlinear phase place, and in actual use, can pass through to adjust the length difference between the first transmission line 401 and the second transmission line 402 according to the demand of actual use scenes, there is certain phase difference while making the signal transmission with same phase by C1 and C2 input from C3 and C4 output, realize the purpose of phase shift, in the embodiment of the present invention, because the phase difference of two L-type probes that need to be on the quadrangle diagonal is 180 degree, therefore can be by the setting to the first transmission line 401 and the second transmission line 402 length difference, while making the signal transmission with same phase by C1 and C2 input from C3 and C4 output, phase difference is 180 degree.Simultaneously, by the end by the 3rd transmission line 403, be connected on the second transmission line 402, other end open circuit or short circuit, for example the 3rd transmission line 403 and the second transmission line 402 are formed to T-shaped structure, making phase difference near frequency range working frequency points is non-linear with frequency change, thereby realize the phase shift effect of 180 degree in bandwidth range, also contribute to further to realize the broadband of antenna system.
Optionally, the length of the 3rd transmission line 403 can be 1/4th of the wavelength of 403 signal transmissions of the 3rd transmission line.
For the performance of the antenna system provided in the embodiment of the present invention is described, below gives an example and be specifically described in conjunction with experimental data.
In the antenna system provided in the embodiment of the present invention, the size of each building block can be: dielectric-slab 20 is of a size of 150mm * 150mm * 1mm, and its relative dielectric constant is 2.2; Radiation metal plate 501 is of a size of 48mm * 48mm * 1mm, and is highly 17mm apart from dielectric-slab 20; The thickness of the thickness of the thickness of radiation metal plate 501, dielectric-slab 20 and metal ground plate 10 is respectively 0.5mm, 1mm and 1mm.
From above-mentioned parameter, the height of antenna system is 19.5mm, this height is lower than 1/4th of operation wavelength, so the sectional thickness of the antenna system that provides of the embodiment of the present invention is far below die casting a period of time of conventional antenna for base station, thereby realized the miniaturization of antenna system.
The reflection coefficient curve of four ports of the radiant body in antenna system as shown in Figure 6 is known, the reflection coefficient of four ports that four metal feeder pillar 5031a, 5032a, 5033a, 5034a in four L-type probes of radiant body are connected with phase shifter lower than-10dB, meets the impedance bandwidth requirement of conventional antenna for base station in 1.92GHz～2.69GHz.
The S parameter curve of the power splitter in antenna system as shown in Figure 7 is known, and the S12 of power splitter and the difference of S13 are less than 0.1dB in 1.9GHz～2.7GHz frequency range, can in broadband range, realize good constant amplitude merit minute function; Wherein the S parameter refers to the circuit characteristic index of power splitter, and this index comprises S12 and S13, and S12 and S13 mean respectively the energy size of two output port A2, A3 institute output signals of power splitter.
The phase difference that phase shifter in antenna system produces as shown in Figure 8 is known with frequency variation curve, and phase shifter can be realized 180 degree phase shifts in 1.9GHz～2.7GHz frequency range, and error is in 174～189 degree scopes, and worst error is 9 degree only.
By Fig. 6-Fig. 8, can be found out, the impedance bandwidth of antenna system reaches the requirement of macro station antenna.
The two-dimensional directional figure of antenna system as shown in Figure 9 is known, and more than the directional diagram gain of antenna system in 1.92GHz～2.69GHz frequency range reaches 8.6dB, and beam quality reaches traditional base station antenna requirement.
The antenna system that the embodiment of the present invention provides, comprise interconnective metal ground plate and dielectric-slab, and be positioned at two power splitters and two phase shifters on dielectric-slab, and the radiant body be connected respectively with phase shifter with metal ground plate, this radiant body comprises: the radiation metal plate, metal column, four L-type probes, by the air between radiation metal plate and metal ground plate and dielectric-slab as dielectric layer, realize take the micro-strip paster antenna structure that the radiation metal plate is metal patch, thereby realized the miniaturization of antenna system.By power splitter, phase shifter, and four L-type probes that comprise metal feeder pillar and metal feed flat board carry out feed in the mode of 4 coupling feeds to the radiation metal plate, make the radiant body of antenna system there is wider impedance bandwidth, and then contribute to realize the broadband of antenna system, and then realized the broadband and miniaturization of antenna system simultaneously.
And the present invention adopts microstrip line construction to realize the broadband of power splitter and phase shifter, make antenna system there is thickness low, the characteristics that bandwidth range is wide, the impedance bandwidth of antenna system reaches the requirement of macro station antenna, and radiation parameter is close with traditional macro station antenna.
Through the above description of the embodiments, the those skilled in the art can be well understood to the mode that the present invention can add essential common hardware by software and realize, can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Understanding based on such, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium can read, floppy disk as computer, hard disk or CD etc., comprise some instructions with so that computer equipment (can be personal computer, server, or the network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (9)
1. an antenna system, is characterized in that, comprising: interconnective metal ground plate and dielectric-slab, and be positioned at two power splitters and two phase shifters on described dielectric-slab, and the radiant body be connected respectively with described phase shifter with described metal ground plate;
Wherein, described two power splitters are respectively used to produce the signal transmission that the two-way amplitude is identical and phase place is identical; The described two-way amplitude signal transmission identical and that phase place is identical that described two phase shifters are respectively used to that described power splitter is produced is converted to the identical but signal transmission of single spin-echo of two-way amplitude;
Wherein, described radiant body comprises: the radiation metal plate, metal column, four L-type probes, described metal column is electrically connected with described metal ground plate and described radiation metal plate respectively, described four L-type probes form a quadrangle, and described tetragonal two diagonal are parallel with two diagonal of described radiation metal plate respectively; Each L-type probe in described four L-type probes comprises metal feeder pillar and metal feed flat board, for described radiation metal plate is carried out to feed, one end of described metal feeder pillar is connected with described phase shifter, the other end is connected with described metal feed is dull and stereotyped, and the described metal feed that the described L-type probe on described tetragonal at least one diagonal comprises is dull and stereotyped parallel with described radiation metal plate.
2. antenna system according to claim 1, is characterized in that,
Described radiation metal plate is square.
3. antenna system according to claim 1, is characterized in that,
The described metal feeder pillar that described L-type probe on described tetragonal at least one diagonal that described four L-type probes form comprises is vertical with described radiation metal plate.
4. antenna system according to claim 1, is characterized in that,
Be provided with gap between the described metal feed flat board that described L-type probe on described tetragonal at least one diagonal that described four L-type probes form comprises and described radiation metal plate.
5. antenna system according to claim 1, is characterized in that,
The described metal feed that described L-type probe on described tetragonal at least one diagonal that described four L-type probes form comprises is dull and stereotyped for square.
6. antenna system according to claim 1, is characterized in that,
Described power splitter comprises main transmission line, for input signal being divided into to the two-way signal transmission; Two first branch's transmission lines, two second branch's transmission lines, one end of described two first branch's transmission lines connects respectively the two ends of described main transmission line, the other end of described two first branch's transmission lines connects respectively an end of described two second branch's transmission lines, the other end of described two second branch's transmission lines connects respectively described phase shifter, and signal transmission that phase place identical identical for generation of the two-way amplitude.
7. antenna system according to claim 6, is characterized in that,
The length of every first branch's transmission line in described two first branch's transmission lines be respectively every described the first transmission line institute of branch signal transmission wavelength 1/4th.
8. antenna system according to claim 1, is characterized in that,
Described phase shifter comprises the first transmission line, the second transmission line and the 3rd transmission line, and described the first transmission line and described the second transmission line are for exporting the identical but signal transmission of single spin-echo of two-way amplitude; Wherein, the transmission line that described the first transmission line is linear phase, described the second transmission line and described the 3rd transmission line form the transmission line of nonlinear phase;
One end of described the first transmission line connects described power splitter, and the other end connects described radiant body; One end of described the second transmission line connects described power splitter, and the other end connects described radiant body; One end of described the 3rd transmission line is connected on the second transmission line, other end open circuit or short circuit.
9. antenna system according to claim 8, is characterized in that,
/ 4th of a wavelength that the length of described the 3rd transmission line is described the 3rd transmission line institute signal transmission.
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