CN1288798C - Surface mounting antenna, antenna equipment and communication equipment using the antenna - Google Patents
Surface mounting antenna, antenna equipment and communication equipment using the antenna Download PDFInfo
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- CN1288798C CN1288798C CNB200310101493XA CN200310101493A CN1288798C CN 1288798 C CN1288798 C CN 1288798C CN B200310101493X A CNB200310101493X A CN B200310101493XA CN 200310101493 A CN200310101493 A CN 200310101493A CN 1288798 C CN1288798 C CN 1288798C
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Abstract
A surface mount antenna includes a loop-shaped radiation electrode arranged so as to be extended over a plurality of surfaces of a dielectric substrate. The front end side of the loop-shaped radiation electrode is branched to provide a plurality of branched radiation electrodes. One side end of the radiation electrode functions as a electric feeding portion connected to an external circuit. One of the branched radiation electrodes is an in-loop branched radiation electrode which is surrounded by a loop-shaped electrode portion including the radiation electrode portion extended from the feeding portion of the radiation electrode to a branching portion and the other branched radiation electrode connected to the radiation electrode portion, the in-loop branched radiation electrode being positioned at an interval from the loop-shaped electrode. A capacitance is generated between the one of the branched radiation electrodes and the radiation electrode portion extended from the feeding portion of the radiation electrode to the branching portion.
Description
Technical field
The present invention relates to a kind of surface-mounted antenna (surface mount antenna) that comprises the radiation electrode (radiationelectrode) that is deposited on the dielectric matrix, comprise the antenna equipment and the communication equipment of such antenna.
Background technology
Recently, attentiveness mainly concentrates on the multiband antenna, wherein, by using an antenna, can carry out radio communication on a plurality of frequency bands.For example, the radiation electrode of execution antenna operation comprises a plurality of modes of resonance with different resonance frequencys.Therefore, by utilizing a plurality of modes of resonance of radiation electrode, can use multiband antenna on a plurality of frequency bands, to carry out radio communication and (see the open No.2002-26624 (patent document 1) of Japanese laid-open patent application, the open No.EP0938158A2 specification (patent document 2) of european patent application, international open No.WO99/22420 brochure (patent document 3) and the open No.2002-158529 (patent document 4) of Japanese laid-open patent application.
Usually, for the multiband antenna of a plurality of modes of resonance of using radiation electrode, use the resonance under dominant mode and higher order mode.That is, in a plurality of modes of resonance of resonance electrode, the dominant mode resonance frequency is minimum, compares with the dominant mode resonance frequency, and the higher order mode resonance frequency is higher.Therefore, as follows: as in the lower band of a plurality of frequency bands that is the radio communication setting, to carry out the dominant mode resonance of radiation electrode, in the high frequency band of a plurality of frequency bands that is the radio communication setting, carry out the higher order mode resonance of radiation electrode to being provided with of radiation electrode.
Yet, for example,, be difficult to control independently the dominant mode resonance and the higher order mode resonance of radiation electrode for small size antenna such as surface-mounted antenna.For example, can carry out dominant mode resonance satisfactorily in some cases, but higher order mode resonance is insufficient.Therefore, be difficult to form the radiation electrode that dominant mode resonance and higher order mode resonance can be carried out simultaneously satisfactorily.
Summary of the invention
In order to overcome problem described above, the preferred embodiments of the present invention have proposed a kind of surface-mounted antenna, wherein, can control resonance under the dominant mode of radiation electrode and the resonance under the higher order mode thereof independently of each other, therefore, can as set in advance, easily carry out radio communication on a plurality of frequency bands.In addition, the preferred embodiments of the present invention have proposed a kind of antenna equipment of the surface-mounted antenna that comprises such novelty and the communication equipment that comprises this antenna equipment.
According to the preferred embodiments of the present invention, surface-mounted antenna comprises: dielectric matrix; Radiation electrode, can be used for carrying out antenna operation, and shape with annular, so that on a plurality of surfaces of dielectric matrix, extend, described radiation electrode comprises on the side that is arranged in it and the feed part that is connected with external circuit, branch the component of this radiation electrode on being present in the path of assigning to the other end from current feed department, so that a plurality of branches radiation electrode is provided, one of them of these branch's radiation electrodes is branch's radiation electrode in the ring, branch's radiation electrode is by comprising the radiation electrode part that partly extends to component from feed in this ring, and surround with another branch's radiation electrode that radiation electrode partly is connected, branch's radiation electrode and the ring electrode certain spacing of partly being separated by in the described ring, branch's radiation electrode and the radiation electrode that partly extends to component from feed form electric capacity between partly in ring, and the front end of each branch's radiation electrode is set on the different surface of dielectric matrix at least.
Simultaneously, according to another preferred embodiment of the present invention, antenna equipment comprises: substrate and have the unique texture of the preferred embodiments of the present invention and be arranged on surface-mounted antenna on the substrate of antenna equipment, described substrate has the interior grounding electrode at least one zone outside the installation region that is arranged on surface-mounted antenna, and described surface-mounted antenna is arranged on the non-ground area of substrate.
In addition, according to another preferred embodiment of the present invention, described communication equipment comprises the surface-mounted antenna or the antenna equipment of the unique texture with the preferred embodiments of the present invention.
In the surface-mounted antenna or antenna equipment of the preferred embodiments of the present invention, loop-shaped radiation is branched at the component that is present on the path of assigning to the other end from current feed department, so that a plurality of branches radiation electrode is provided, and the front end of these branch's radiation electrodes is arranged on the different surfaces of dielectric matrix at least, so that isolate mutually.Therefore, for example, preferably one of them of branch's radiation electrode is provided with, is better than other branch's radiation electrodes and the described radiation electrode electromagnetic coupled between partly thereby make it and partly extend to electromagnetic coupled between the radiation electrode part of component from feed.Therefore, the branch's radiation electrode that has a stronger electromagnetic coupled with the radiation electrode that partly extends to component from feed can serve as the radiation electrode that is used to control higher order mode.That is, disclosed can be by adjusting loop-shaped radiation beginning (open end) and the electric capacity (electromagnetic coupled degree) between the part of the radiation electrode relative with this beginning, resonance frequency or other characteristics under the control higher order mode.According to the preferred embodiments of the present invention, loop-shaped radiation has the structure that is branched from the component of a side of the feed part other end being present in, so that define a plurality of branches radiation electrode, and one of them of these branch's radiation electrodes can be served as the radiation electrode that is used to control higher order mode.Therefore, be used to control branch's radiation electrode of higher order mode, can control resonance frequency or coupling under the higher order mode of radiation electrode by use, and can be to the influence of working the mischief property of dominant mode.Thereby, the antenna electrode that can carry out antenna operation under dominant mode that sets in advance and higher order mode reliably can easily be provided.In addition, when situation changed, this radiation electrode can be easily and apace corresponding to new design.
In addition, according to the preferred embodiments of the present invention, one of them of branch's radiation electrode be by comprise from feed partly extend to component radiation electrode part and with ring that another branch's radiation electrode that this radiation electrode partly is connected surrounds in branch's radiation electrode, branch's radiation electrode and ring electrode are partly mutually across a certain distance in the described ring.Therefore, the electric field of branch's radiation electrode may be limited in the annular of branch's radiation electrode in the ring in the ring.Therefore, for example, even such as can serve as " " objects such as human body near antenna, also can avoid the electric field of radiation electrode to be attracted to consumingly " " generation of the problem of object.That is, this antenna can prevent to suffer the influence from the harmfulness of outside.
In addition, according to the preferred embodiments of the present invention, this radiation electrode is branched to the component on a side (the being open end side) path of the other end in a side (feed part) that is present in from an end, so that form a plurality of branches radiation electrode.In other words, the beginning of radiation electrode is separated into a plurality of electrodes, that is, and and a plurality of branches radiation electrode.The layout and the position at the beginning by each branch's radiation electrode is set, can reduce radiation electrode beginning and " " between electric capacity.This can make antenna efficiency and bandwidth be improved.
In addition, according to the preferred embodiments of the present invention, radiation electrode preferably has the structure of ring-type.Therefore, can easily increase the effective length of radiation electrode, thereby produce bigger electrical length, this can carry out on size has the dielectric matrix of restriction.In addition, can between the radiation electrode that partly extends to component from feed and branch's radiation electrode, electric capacity be set.Therefore, by electric capacity inductance (inductance) (electrical length) is applied to radiation electrode.According to this structure, can increase the inductance of radiation electrode.Therefore, can easily reduce surface-mounted antenna, comprise the antenna equipment of this surface-mounted antenna and the size that comprises the communication equipment of this antenna equipment.
Preferably, at least the radiation electrode that the front end of branch radiation electrode is partly extended to component in the ring from feed partly surrounds, and with this radiation electrode certain spacing of partly being separated by, branch's radiation electrode and near branch's radiation electrode in the ring and the spacing between the nearer relatively radiation electrode in feed part position part in ring is greater than branch's radiation electrode in ring with near branch's radiation electrode in encircling and from the spacing of the relative radiation electrode far away in feed part position between partly.Therefore, can encircle in the branch radiation electrode with produce highfield near branch's radiation electrode in the ring and in the annular that current feed department divides the part of relative radiation electrode far away to define.Therefore, can be as described above, prevent may by can serve as " " human body or the deterioration of the antenna performance that causes of the influence of other objects.In addition, can easily strengthen the coupling and the antenna efficiency of higher order mode.
In addition, compare with branch's radiation electrode in the ring position from feed part the nearer and length notch portion of branch's radiation electrode extension in the ring, under the situation of comparing position length of notch portion farther and that branch's radiation electrode extends in the ring from the feed part with branch radiation electrode in the ring, the highfield of generation can concentrate on the interior branch's radiation electrode of ring and be present between the radiation electrode of feed electrode one side.Therefore, though human body or other objects near antenna, also can prevent electric field attracted to " ".Thereby, can reduce because the change of the antenna performance that the influence of human body or other objects may cause.
Preferably, be arranged on no feed (no feeding) radiation electrode that produces double resonance under the higher order mode with loop-shaped radiation.In this case, because the double resonance state that loop-shaped radiation and no feed radiation electrode cause, so can increase bandwidth under the higher order mode of radiation electrode.For comprising the antenna equipment that is installed on the substrate and has the surface-mounted antenna of no feed radiation electrode, even be arranged on the electrical length of the no feed radiation electrode on the dielectric matrix of surface-mounted antenna, less than electrical length corresponding to the resonance frequency of setting, be not connected with grounding electrode via having the circuit that is arranged on the inductance on the substrate by will there being the feed radiation electrode, can compensate this short electrical length.Therefore, can as setting in advance, there be the operation of feed radiation electrode.This helps to reduce the size of surface-mounted antenna.
In addition, preferably, can be provided for adjusting the frequency adjustment member of the resonance frequency of radiation electrode.In this case, even,, also can adjust to resonance frequency by the frequency of utilization adjustment member because lower processing accuracy or other problems may cause the resonance frequency of radiation electrode to depart from mutually with appointed frequency.Therefore, can provide the antenna performance with high reliability surface-mounted antenna, comprise the antenna equipment of this surface-mounted antenna and the communication equipment that comprises this antenna equipment.
Preferably, can be provided for controlling the recess (cut-in) of resonance frequency of the higher order mode of radiation electrode.In this case, not only can easily be controlled at the resonance under the minimum higher order mode of a plurality of resonance condition medium frequencys under the higher order mode, and can easily control the resonance under the higher order mode that its frequency is higher than above-described low-limit frequency.
In addition, one of them of branch's radiation electrode be arranged on the upper surface of dielectric matrix and another branch's radiation electrode is arranged on the side surface of dielectric matrix or in the ring branch's radiation electrode have under the situation of bigger width, also can obtain above-described splendid advantage.
From the following detailed description of preferred embodiment that is adopted with reference to the accompanying drawings, other features of the present invention, key element, characteristic and advantage will become more apparent.
Description of drawings
Figure 1A and 1B illustrate according to the surface-mounted antenna of first preferred embodiment of the present invention and the antenna equipment that comprises this antenna;
Fig. 2 illustrates the model of the reduced form of the radiation electrode among Fig. 1;
Fig. 3 is an improved expanded view according to the surface-mounted antenna of first preferred embodiment of the present invention;
Fig. 4 A and 4B are other the improved expanded views according to the surface-mounted antenna of first preferred embodiment of the present invention;
Fig. 5 A and 5B are other the improved expanded views that also have according to first preferred embodiment of the present invention;
Fig. 6 A and 6B illustrate according to the surface-mounted antenna of second preferred embodiment of the present invention and the antenna equipment that comprises this antenna;
Fig. 7 A is similar with 6B to Fig. 6 A with 7B, illustrates according to the surface-mounted antenna of second preferred embodiment of the present invention and the antenna equipment that comprises this antenna;
Fig. 8 illustrates the model according to the surface-mounted antenna of second preferred embodiment, wherein is provided with a plurality of non-feed radiation electrodes;
Fig. 9 illustrates the 3rd preferred embodiment of the present invention;
Figure 10 illustrates an improvement of the 3rd preferred embodiment of the present invention.
Figure 11 A illustrates the model according to the surface-mounted antenna of another preferred embodiment of the present invention;
Figure 11 B is the expanded view according to the surface-mounted antenna of a preferred embodiment of the present invention;
Figure 12 is the expanded view according to the surface-mounted antenna of another preferred embodiment of the present invention;
Figure 13 is the expanded view of the surface-mounted antenna of another preferred embodiment of also having according to the present invention;
Figure 14 is the expanded view of example with surface-mounted antenna of the recess that forms in branch's radiation electrode;
Figure 15 is the curve chart of example that the impedance operator of surface-mounted antenna is shown.
Embodiment
The preferred embodiments of the present invention are described below with reference to the accompanying drawings.
Figure 1A is first preferred embodiment of surface-mounted antenna and the perspective illustration that comprises the antenna equipment of this antenna.Figure 1B is the expanded view of this surface-mounted antenna.
The antenna equipment 1 of first preferred embodiment comprises the surface-mounted antenna 2 that is installed in such as on the circuitry substrate of using 3 in communication equipment.Grounding electrode 4 is arranged on the circuitry substrate 3 outside the regional Z of installation surface mount type antenna 2 at least therein.Therefore, surface-mounted antenna 2 is by the non-ground area Z of mounted on surface in the circuitry substrate 3 that grounding electrode 4 wherein is not set.
Surface-mounted antenna 2 comprises: the radiation electrode 7 that is roughly the dielectric matrix 6 of rectangular shape and is provided with on matrix 6.For radiation electrode 7, its cardinal extremity (base-end) part is arranged on the side surface 6a of matrix 6.Radiation electrode 7 arranges that according to the mode of annular wherein, electrode 7 successively by side surface 6b and 6c, extends to side surface 6d from side surface 6a.In addition, the front side of radiation electrode 7 (front side) is branched, thereby radiation electrode 8A of branch and the radiation electrode 8B of branch are provided.That is, the radiation electrode 8a of branch of layout extends to side surface 6a from side surface 6d, and in other words, this branch's radiation electrode extends according to the mode of returning to base end side Q.The radiation electrode 8B of branch is arranged on the upper surface 6e.In Fig. 2, show radiation electrode 7 with the form of simplifying.In Fig. 1, a part that is arranged on the radiation electrode 7 of side surface 6a to the 6d is arranged, so that it bends on the upper surface 6e of matrix 6.In first preferred embodiment, the part in the scope from base end side Q to component in the radiation electrode 7 is called as main electrode 9, and wherein, electrode 7 is branched to radiation electrode 8A of branch and 8B from component.That is to say that radiation electrode 7 comprises: primary radiation electrode 9 and radiation electrode 8A of branch and 8B.
The feed part (that is, as the RF circuit of launching a receiving circuit) that the base end side Q formation of radiation electrode 7 is connected with the external circuit on being arranged on circuitry substrate 3.The radiation electrode 8A of each branch of radiation electrode 7 and the front end of 8B constitute the beginning (open end) respectively.Beginning 8ak and the 8bk of radiation electrode 8A of branch and 8B are arranged on the different surfaces of matrix 6.Especially, the beginning 8ak of the radiation electrode 8A of branch is arranged on the side surface 6a of matrix 6, and relative with the feed part Q of radiation electrode 7 and with this current feed department branch certain spacing of being separated by.In addition, the beginning 8bk of the radiation electrode 8B of branch is arranged on the upper surface 6e of matrix 6, and with radiation electrode 7 in do not comprise the part of feed part Q relative and with this part certain spacing of being separated by.
In first preferred embodiment, the radiation electrode 8B of branch is comprised, and the ring electrode of primary radiation electrode 9 (promptly extending to the radiation electrode part of component from the feed part Q of radiation electrode 7) and the radiation electrode 8A of branch that is connected with primary radiation electrode 9 partly surrounds, and with this ring electrode certain spacing of partly being separated by.Therefore, branch's radiation electrode 8B is (in-loop) branch radiation electrode in the ring.The front side of branch's radiation electrode (ring in branch radiation electrode) 8B is surrounded by primary radiation electrode 9, and with respect to primary radiation electrode 9 certain spacing of being separated by.Therefore, at the radiation electrode 8B of branch with surround between the primary radiation electrode 9 of the radiation electrode 8B of branch and formed electric capacity.
Be provided with the spacing Gk between the beginning 8bk of the radiation electrode 8B of branch and the primary radiation electrode 9 relative enough little, thereby make the beginning 8bk of the radiation electrode 8B of branch and primary radiation electrode 9 can carry out mutual electromagnetic coupled with beginning 8bk.On the other hand, be provided with the spacing g between the feed part Q of the beginning 8ak of the radiation electrode 8A of branch and radiation electrode 7 greater than spacing Gk, thereby make the beginning 8ak of the raddiating circuit 8A of branch and the feed part Q of radiation electrode 7 can carry out mutual electromagnetic coupled hardly.
The surface-mounted antenna 2 that will comprise the radiation electrode 7 that is arranged on the matrix 6 is arranged in the desired location on the circuitry substrate 3.Therefore, antenna 2 is connected with RF circuit 10 by such as wiring diagram (wiring pattern), chip coil (chip coil) or be arranged on the match circuit of other elements on the circuitry substrate 3.For example, by match circuit, signal is offered the feed part Q of radiation electrode 7 from external RF circuit 10 from the outside such as chip coil 11 or other elements.This signal is by feed part Q and 9 transmission of primary radiation electrode, so that arrive component.Then, signal is cut apart and is entered two lines, that is, a route is through the radiation electrode 8A of branch, and another route is through the radiation electrode 8B of branch.Like this, signal is launched.Emission by signal makes radiation electrode 7 radiation resonance, thereby can operate antenna.For the method that surface-mounted antenna 2 is arranged on the circuitry substrate 3, can use various technology.For example, be installed on the circuitry substrate 2, matrix 6 joined on the circuitry substrate 3 by material bonding or that other are suitable by the matrix 6 of welding (soldering) with surface-mounted antenna 2, or the like.Can use such technology arbitrarily.
Resonance under the dominant mode of radiation electrode 7 carries out according to the resonance condition similar to the dominant mode resonance of λ/4 unipole antennas.
There is certain relation in the whole radiation electrode 7 that comprises radiation electrode 8A of branch and the radiation electrode 8B of branch with resonance under the dominant mode of radiation electrode 7.Therefore, effective length in effective length in the scope of beginning 8ak from feed part Q to the radiation electrode 8A of branch, the scope of beginning 8bk from feed part Q to the radiation electrode 8B of branch etc. is provided with, thus make radiation electrode 7 have with the dominant mode that requires under the corresponding electrical length (electricallength) of resonance frequency.
In addition, much less, radiation electrode 8A of branch and the radiation electrode 8B of branch all with the higher order mode of radiation electrode 7 under resonance have certain relation.Yet in radiation electrode 8A of branch and 8B, there is stronger electromagnetic coupled in the radiation electrode 8B of branch and primary radiation electrode 9, therefore with the higher order mode of radiation electrode 7 under resonance frequency and impedance have bigger relation.The relation of the resonance frequency under the radiation electrode 8A of another branch and the higher order mode is relative less.
If can change with higher order mode and have the beginning 8bk of the radiation electrode 8B of branch of bigger relation and the spacing Gk between the primary radiation electrode 9 relative and opposed area (in other words with beginning 8bk, electric capacity between beginning 8bk and the radiation electrode relative part) with beginning 8bk, then can change the resonance frequency under the higher order mode significantly, and make the change of resonance frequency under the dominant mode keep as far as possible for a short time.Therefore, in this first preferred embodiment, the beginning 8bk of the radiation electrode 8B of branch and spacing Gk and the opposed area between the primary radiation electrode 9 are provided with, thereby make the resonance frequency under the higher order mode of radiation electrode 7 have the value of setting.
In addition, in first preferred embodiment, primary radiation electrode 9 arranges along two sides of the radiation electrode 8B of branch (side edge), and near electrode 8B and with the electrode 8B certain spacing of being separated by.At side of the radiation electrode 8B of branch with near an above-mentioned side and from the spacing Gn between the part of the nearer relatively primary radiation electrode 9 of feed part Q and at another side of the radiation electrode 8B of branch with near the spacing Gd between the part of another above-mentioned side and relative primary radiation electrode 9 far away with feed part Q, and the higher order mode radiation electrode 7 of working down and the coupling between RF circuit 10 sides have very big relation.Promptly, by adjusting spacing Gn and Gd (promptly, be adjusted at electric capacity that produces among the spacing Gn and the electric capacity that in spacing Gd, produces), the coupling in the time of can controlling the resonance of radiation electrode 7 under higher order mode, and can be to the influence of the working the mischief property of resonance under the dominant mode.Mate relevant with bandwidth.Therefore, in first preferred embodiment, spacing Gn and Gd are provided with, thereby realize radiation electrode 7 desired coupling under higher order mode, in addition, can increase frequency bandwidth.
Promptly, by adjusting spacing Gk, Gn and the Gd between branch's radiation electrode (branch's radiation electrode in the ring) 8B and the primary radiation electrode 9, can fully be independent of dominant mode, resonance frequency under the higher order mode and described coupling are controlled, and can be caused dangerous influence hardly the resonance that produces under the dominant mode.
In the example of Figure 1A and 1B, spacing Gn is substantially equal to spacing Gd.Yet these spacings Gn and Gd needn't be equal to each other.For example, as spacing Gn and Gd are studied the result who realizes satisfied coupling, shown in Fig. 4 A and 4B, disclosed in some cases, spacing Gn can be greater than spacing Gd.In this case, represented as the alternate long and short dash line among Fig. 4 A and the 4B, electric field is limited in the ring (loop) of the radiation electrode 7 that comprises primary radiation electrode 9 and the radiation electrode 8B of branch.Therefore, can avoid when can serve as " " such as the object of human body or other entities during near (reach) surface-mounted antenna 2, electric field attracted to " " object and to the problem of the influence of working the mischief property of antenna performance.In addition, in some cases, spacing Gn can be less than interval Gd.
For example, in order to improve coupling, spacing Gn and Gd are not adjusted, has the otch of width (slit) much at one but be provided with spacing Gn and Gd, and length Sn and Sd to otch adjust, so that control capacitance Cn and Cd, thereby can improve coupling under the higher order mode of radiation electrode 7.In the superincumbent description, length Sn (see figure 3) is to compare the length of position from the relative nearer and otch that extend along the radiation electrode 8B of branch of feed part Q with branch radiation electrode (branch's radiation electrode in the ring) 8B.Length Sd compares the length of position from the relative far away and otch that extend along the radiation electrode 8B of branch of feed part Q with the radiation electrode 8B of branch.Between the part of the nearer relatively primary radiation electrode 9 of feed part Q, produce capacitor C n in the radiation electrode 8B of branch and and position relative with the radiation electrode 8B of branch.Between the part of feed part Q primary radiation electrode 9 far away relatively, produce capacitor C d in the radiation electrode 8B of branch and and position relative with the radiation electrode 8B of branch.
In addition, in the example of Fig. 3, incision length Sn is more preferably greater than incision length Sd.In this case, compare the capacitor C n that the position produces in the nearer otch of feed part Q with the radiation electrode 8B of branch, greater than comparing the capacitor C d that the position produces in feed part Q otch far away with the radiation electrode 8B of branch.Therefore, the electric field strength between the part of the nearer primary radiation electrode 9 of feed part Q is bigger at radiation electrode 8B of branch and position.Thereby, can reduce because the change of the antenna performance that human body or other objects produce during near antenna.
As previously discussed, according to first preferred embodiment, the component on being present in from the feed part Q of a side end to the opposite side path at (beginning) is cut apart radiation electrode 7, so that form a plurality of radiation electrode 8A of branch and 8B.Thereby radiation electrode 7 has wherein that beginning one side of this electrode 7 is branched and the configuration that separates.Beginning of radiation electrode 7 and radiation electrode 7 " " between will produce the highest electric field.The beginning 7 and " " between electric field and the reduction of the antenna efficiency of surface-mounted antenna 2 and bandwidth between have certain relation.Yet in first preferred embodiment, preferably beginning one side with radiation electrode 7 branches into two radiation electrode 8A of branch and 8B.Therefore, compare with the radiation electrode 8A of branch as another branch's radiation electrode, as the radiation electrode 8B of branch of one of branch's radiation electrode can be positioned at from " " at a distance.Therefore, can be reduced in radiation electrode 7 and " " between the electric field strength that produces.Thereby, can improve the antenna efficiency and the bandwidth of surface-mounted antenna 2.
In addition, in first preferred embodiment, one of them of branch's radiation electrode constituted the radiation electrode 8B of branch in the ring.The fore-end of the radiation electrode 8B of branch is surrounded by primary radiation electrode 9 in the ring, and is provided with certain spacing between fore-end and primary radiation electrode 9, thereby can form electric capacity.Electric capacity can be applied to radiation electrode 7, thereby increase the inductance (electrical length) of radiation electrode 7.Therefore, each other under about equally the condition, compare, can reduce the resonance frequency of the radiation electrode 7 of first preferred embodiment with the resonance frequency of radiation electrode with linearity configuration in the effective length of radiation electrode.A reason is: corresponding to the inductance that is produced by above-mentioned electric capacity, increased the inductance of radiation electrode 7.In other words, when requiring identical resonance frequency, the effective length of the radiation electrode 7 of first preferred embodiment can be provided with shortlyer than effective length such as the linearized radiation electrode.Therefore, can easily reduce the size of matrix 6 (that is, surface-mounted antenna 2).
In addition, in first preferred embodiment, radiation electrode 7 has ring-type, and radiation electrode 7 is carried out branch at the feed part Q that is positioned at from radiation electrode 7 to the component on the path of a side of the other end, so that radiation electrode 8A of branch and 8B are set, and electromagnetic coupled is better than in the beginning of the radiation electrode 8A of branch and the electromagnetic coupled between the primary radiation electrode between the beginning of the radiation electrode 8B of branch and the primary radiation electrode 9.According to this structure, radiation electrode 8A of branch and 8B all with dominant mode under the resonance that produces have certain relation.Yet the radiation electrode 8B of branch has bigger relation with the resonance that forms under higher order mode, and the radiation electrode 8A of branch is almost irrelevant with this resonance.Therefore, its advantage is, can be with the radiation electrode 8B of branch with the electrode of doing to control to the resonance higher order mode under, thereby, can fully carry out the control of the resonance frequency under the dominant mode and coupling etc. each other independently and the resonance frequency under higher order mode is controlled and coupling etc.
According to first preferred embodiment, the primary radiation electrode 9 that partly constitutes radiation electrode 7 is arranged, thereby its all four side surface 6a at matrix 6 are extended to 6d continuously.Yet, needn't to 6d, primary radiation electrode 9 be set at all four side surface 6a of matrix 6.For example, shown in the expanded view of the surface-mounted antenna 2 shown in Fig. 5 A and 5B, at least one in the 6d of four side surface 6a that primary radiation electrode 9 can be arranged on matrix.
In addition, as shown in figure 14, can on the radiation electrode 8A of branch, form recess 21.In this case, shown in the curve chart of the impedance operator among Figure 15 A, can control, thereby make these two resonance condition mutual alignments in curve chart more approaching three rank and quadravalence resonance (higher order mode).By shown in Figure 15 B, surface-mounted antenna 2 (roughly have following size: width 8mm, length 23mm and thickness 6mm) is installed on the substrate 3 and tests, can obtain the curve chart among Figure 15 A.Solid line α in Figure 15 A represents the impedance operator that obtains when the length L of the grounding electrode on the substrate 34 is approximately 90mm.Dotted line β represents the impedance operator that obtains when the length L of the grounding electrode on the substrate 34 is approximately 180mm.Can construct surface-mounted antenna shown in Figure 14 2, thereby make first resonance (dominant mode) occur in the low-frequency band shown in Figure 15 A, and make second to the 4th resonance (higher order mode) occur in high frequency band.According to by the test that the present inventor carried out, confirmed that second to the 4th resonance (higher order mode) can be respectively be controlled by interior ring radiation electrode 8B of branch and the recess 21 that mainly forms in the radiation electrode 8A of branch.
Below, second preferred embodiment will be described.In the description of second preferred embodiment, use identical reference symbol to represent and the first preferred embodiment components identical, and no longer it is repeated in this description.
In preferred second embodiment, shown in Fig. 6 A, 6B, 7A and 7B, except annular radiation electrode 7, no feed radiation electrode 12 also is set on the matrix 6 of surface-mounted antenna 2, and between electrode 7 and 12, certain spacing is set.Preferably, except no feed radiation electrode 12, the structure of second preferred embodiment is identical with the structure of first preferred embodiment.Fig. 6 A and Fig. 7 A are respectively the perspective illustration of antenna equipment.Fig. 6 B is the expanded view of the surface-mounted antenna 2 shown in Fig. 6 A.Fig. 7 B is the expanded view of the surface-mounted antenna 2 shown in Fig. 7 A.
No feed radiation electrode 12 can carry out electromagnetic coupled with radiation electrode 7, so that with radiation electrode 7, produces the double resonance state under the higher order mode.Therefore, for example, can be increased in the bandwidth under the higher order mode.There is certain relation in no feed radiation electrode 12 with the electromagnetic coupled of radiation electrode 7 and the double resonance state of no feed radiation electrode 12 and radiation electrode 7.Distance D and above-mentioned electromagnetic coupled between no feed radiation electrode 12 and the radiation electrode 7 have certain relation.In second preferred embodiment, spacing between no feed radiation electrode 12 and the radiation electrode 7 etc. is provided with, thereby makes no feed radiation electrode 12 and radiation electrode 7 can have the double resonance state of requirement.
Shown in Fig. 6 A and 6B, the beginning 8bk of the radiation electrode 8b of branch and the front end of no feed radiation electrode 12 are provided with, thereby make the primary radiation electrode 9 that partly constitutes radiation electrode 7 between the front end of beginning 8bk and electrode 12.In this case, not only there are not the front end of feed radiation electrode 12 and the space D between the primary radiation electrode 9, and there is not a spacing d between the beginning 8bk of the front end of feed radiation electrode 12 and the radiation electrode 8B of branch, and the width W that is present in the part of the primary radiation electrode 9 between the beginning 8bk of the front end of no feed radiation electrode 12 and the radiation electrode 8B of branch, all there is certain relation in the electromagnetic coupled (that is double resonance) with no feed radiation electrode 12 and radiation electrode 7.Therefore, in this case, not only to but also to be provided with, thereby make no feed radiation electrode 12 and radiation electrode 7 can have satisfied double resonance state space D to the width W of spacing d and primary radiation electrode 9.
In the antenna electrode 1 of second preferred embodiment, shown in Fig. 6 A and 7A, the no feed radiation electrode 12 of surface-mounted antenna 2 is connected with the grounding electrode 4 on the circuitry substrate 3.For surface-mounted antenna 2, need reduce size.Simultaneously, the size of matrix 6 reduces and need meet the demands.Therefore, when on undersized matrix 6, not only forming loop-shaped radiation 7, and when forming the radiation electrode 12 of no feed, inevitably, must be provided with the zone that no feed radiation electrode 12 is positioned at narrower.Therefore, in some cases, it is shorter than desired length that the electrical length of no feed radiation electrode 12 becomes.For such situation, no feed radiation electrode 12 directly is not connected with grounding electrode 4, but comprises the circuit 13 with inductance on the adapter path of extending between no feed radiation electrode 12 and the grounding electrode 4.Circuit 13 can be applied to inductance no feed radiation electrode 12.Therefore, on the surface, the electrical length of no feed radiation electrode 12 becomes does not have feed radiation electrode 12 electrical length greater than reality.Therefore, form circuit 13, thereby have the inductance that can compensate the deficiency (shortness) of the electrical length of no feed radiation electrode 12.Therefore, on the surface, the electrical length of no feed radiation electrode 12 has the value of setting, thereby can and not have the satisfied double resonance state that produces between the feed radiation electrode 12 at radiation electrode 7.
According to second preferred embodiment, except loop-shaped radiation 7, no feed radiation electrode 12 is set also.Because the double resonance of radiation electrode 7 and no feed electrode 12 can increase the bandwidth under the higher order mode.
In the example of Fig. 6 A, 6B, 7A and 7B, preferably, a no feed radiation electrode 12 is set.Yet, for example, a plurality of no feed radiation electrode 12a and 12b can be set as shown in Figure 8.In this case, by layout and the electrical length of no feed radiation electrode 12a and 12b suitably are set, so that one of them that do not have a feed radiation electrode 12 can be served as the no feed radiation electrode of the double resonance under the dominant mode, and another serves as the no feed radiation electrode of the double resonance under the higher order mode, thereby can easily increase the bandwidth under dominant mode and the higher order mode simultaneously.In addition, can make a plurality of no feed radiation electrodes 12 all serve as the no feed radiation electrode of dominant mode and the higher order mode double resonance under one of them.
Various details the 3rd preferred embodiment in the description of the 3rd preferred embodiment, uses identical reference symbol to represent and the first and second preferred embodiment components identical, and no longer it is repeated in this description.
In the 3rd preferred embodiment, it is characterized in that, in loop-shaped radiation 7, form frequency adjustment member 14 as shown in Figure 9.Except frequency adjustment member 14, the structure of each in other structures of the 3rd preferred embodiment and first and second preferred embodiments is identical.
According to the 3rd preferred embodiment, arrange a plurality of parts 15 of removing electrode along the extended line of otch SL with certain spacing, so that definition frequency adjustment member 14.Frequency adjustment member 14 has increased the length of otch SL effectively.Promptly, by shearing (trimming) or other suitable technology, can downcut otch SL and adjacent electrode part between dividing the electrode part and remove electrode part (surrounding) between the part 15 of electrode by the dotted line P among Fig. 9, thereby increase the length of otch SL.Therefore can adjust resonance frequency changeably.
According to the 3rd preferred embodiment, as described above, the part of the resonance frequency that is used to adjust radiation electrode 7 is provided with.Therefore, can provide the surface-mounted antenna 2 that has as set in advance resonance frequency accurately, and the antenna equipment 1 that comprises such surface-mounted antenna.
In addition, according to the 3rd preferred embodiment, can applying frequency adjustment member 14, so that adjust the length of otch SL changeably, thereby can adjust the frequency of radiation electrode 7 changeably.In this case, for example, can use configuration shown in Figure 10.In example illustrated in fig. 10, be provided with a plurality of protuberances (protuberance) 16 along the side of the radiation electrode 8B of branch.These protuberances have constituted frequency adjustment member 14.In the frequency adjustment member 14 in the example of Figure 10, remove at least one protuberance 16 by shearing or other suitable technologies, thereby the electric capacity between the electrode 8B and 9 on otch SL both sides is changed changeably.Therefore, for example,, can adjust the resonance frequency of radiation electrode 7 changeably by shearing or other suitable technologies.
In the example shown in Fig. 9 and 10, on matrix 6, only be provided with loop-shaped radiation 7.Much less, have or not in setting under the situation of radiation electrode 12 of feed, also frequency adjustment member 14 can be set.
Below the 4th preferred embodiment will be described.The 4th preferred embodiment relates to a kind of communication equipment.It is characterized in that this antenna equipment has the antenna equipment 1 described and one of them of surface-mounted antenna 2 in first to the 3rd preferred embodiment.Except antenna equipment 1 or surface-mounted antenna 2, the structure of this communication equipment has no particular limits.Can suitably construct communication equipment, so that satisfy the various requirement that does not comprise its description in this manual.Therefore antenna equipment 1 described above and surface-mounted antenna 2 omit being repeated in this description it.
This communication equipment has the antenna equipment 1 described and one of them of surface-mounted antenna 2 in first to the 3rd preferred embodiment.Therefore, because the size of antenna equipment 1 or surface-mounted antenna 2 is less, can reduce the size of communication equipment.In addition, can strengthen the reliability of using the wireless antenna that this communication equipment carries out.
The present invention is not limited to first to the 4th preferred embodiment described above.Can also adopt various forms.For example, in first to the 4th preferred embodiment, only on the upper surface of matrix 6, be provided with the radiation electrode 8B of branch that partly constitutes radiating antenna 7.Yet, for example, can arrange the radiation electrode 8B of branch, thereby make it shown in Figure 11 A and 11B, on several surfaces of matrix 6, extend.Therefore, electrode 8B can be the branch's radiation electrode that has bigger width than the part of the branch's radiation electrode 8 except electrode 8B.
In addition, as shown in figure 12, the part of radiation electrode 7 has complications (meandering) shape.In this case, can increase the electrical length of radiation electrode 7.Therefore, can further realize reducing of size.Especially, if the part of meander-shaped is arranged on the zone of CURRENT DISTRIBUTION maximum in the radiation electrode 7, the part that then can strengthen meander-shaped is to increasing the electrical length effect of radiation electrode 7.Therefore, can realize that further bigger size reduces.
In addition, in first to the 4th preferred embodiment, at the beginning 8ak of the radiation electrode 8A of branch and the spacing g between the feed part Q more preferably greater than at the beginning 8bk of the radiation electrode 8B of branch and the spacing Gk between the primary radiation electrode 9.Yet, as shown in Figure 3, spacing g can be provided with to such an extent that be substantially equal to spacing Gk.In this case, for example, preferably increase the length of the radiation electrode 8B of branch that electrode 8B wherein surrounds by primary radiation electrode 9, thereby make the electromagnetic coupled between radiation electrode 8B of branch and the primary radiation electrode 9 be better than the beginning 8ak of the radiation electrode 8A of branch and the electromagnetic coupled between the feed part Q significantly.Simultaneously, in this case, can carry out antenna operation as first to the 4th preferred embodiment.Can obtain and the identical advantage of first to the 4th preferred embodiment.
In addition, in first to the 4th embodiment, consider one of them, promptly partly constitute the radiation electrode 8A of branch of radiation electrode 7 and the electrode 8A among the 8B, beginning 8ak is arranged on the surperficial 6a of the matrix 6 identical with the feed part Q of radiation electrode 7, so as relative with feed part Q and with the feed part Q certain spacing of being separated by.Yet, as shown in figure 13,, can arrange the beginning for radiation electrode 8A of branch and 8B one of them so that its feed part Q with radiation electrode 7 is not relative.
In addition, for branch's radiation electrode 8B in the ring that partly constitutes radiation electrode 7, its front end one side is surrounded by primary radiation electrode 9.Yet as shown in figure 13, the side of the radiation electrode 8B of branch is near primary radiation electrode 9 and spacing Gd of being separated by with it in the ring.The opposed side edges of the radiation electrode 8B of branch is near the radiation electrode 8A of branch and the certain spacing of being separated by with it in the ring.Therefore, can form the radiation electrode 8B of branch in the ring, so that its ring electrode that is comprised primary radiation electrode 9 and the radiation electrode 8A of branch surrounds.In the example of Figure 13, the resonance frequency of higher order mode can be controlled by the spacing of the beginning 8bk of the radiation electrode 8B of branch and the primary radiation electrode relative with beginning 8bk.In addition, the coupling under the higher order mode can be controlled by the spacing Gd between radiation electrode 8B of branch and the primary radiation electrode 9.The advantage that each surface-mounted antenna 2 of the surface-mounted antenna 2 shown in Figure 13 and first to the 4th preferred embodiment is roughly the same.
In addition, as shown in figure 14,, can easily control second, third and the 4th resonance (seeing Figure 15 A) under the higher order mode by in the radiation electrode 8A of branch, forming recess 21 with big width.
In addition, in first to the 4th preferred embodiment, in radiation electrode 7, form two branch's radiation electrodes, i.e. branch's radiation electrode 8A and 8B.Yet, can form at least three branch's radiation electrodes.
The present invention is not limited to each preferred embodiment described above, and can carry out various modifications in claim institute restricted portion.Be included in the technical field of the present invention by suitably being combined in the embodiment that disclosed technical characterictic obtains in each in the different preferred embodiments.
Claims (19)
1. a surface-mounted antenna comprises: dielectric matrix; Radiation electrode is used to carry out antenna operation, and according to the ring-type setting, so that on a plurality of surfaces of dielectric matrix, extend;
Described radiation electrode comprises the feed part that is arranged on the one side and is connected with external circuit, and this radiation electrode is branched at the component that exists along the route of assigning to the other end from current feed department, so that define a plurality of branches radiation electrode;
One of them of branch's radiation electrode is by comprising branch's radiation electrode in the ring that feed partly extends to the radiation electrode part of component and the ring electrode of another branch's radiation electrode of partly being connected with this radiation electrode surrounds, branch's radiation electrode and the ring electrode certain spacing of partly being separated by in the described ring;
Branch's radiation electrode and partly defined electric capacity between the two in the ring from the radiation electrode that feed partly extends to component; And
At least the front end of each branch's radiation electrode is arranged on the different surfaces of dielectric matrix.
2. surface-mounted antenna according to claim 1, it is characterized in that: the front end of branch's radiation electrode is partly surrounded by the radiation electrode that partly extends to component from feed in the ring at least, and the side of the fore-end at least of branch's radiation electrode and near this side and the spacing between the nearer relatively radiation electrode part in the position of feed part in ring is greater than another side of the fore-end at least of branch's radiation electrode in ring with near this another side and from the spacing of the relative radiation electrode far away in the position of feed part between partly.
3. surface-mounted antenna according to claim 1, it is characterized in that: the fore-end of the interior branch of ring radiation electrode is partly extended to the radiation electrode part of component by the feed from radiation electrode at least, surround by otch with the constant width of constant, with its position than branch's radiation electrode in the ring from the feed part far away and other notch portion that branch's radiation electrode extends in the ring compare, its position than branch's radiation electrode in the ring from the feed part near and in the ring notch portion of branch's radiation electrode extension have bigger length.
4. surface-mounted antenna according to claim 1, it is characterized in that: in partly constituting a plurality of branches radiation electrode of radiation electrode, the front end of branch's radiation electrode is arranged on the current feed department of radiation electrode and divides on the surface of identical dielectric matrix, and this front end and current feed department divide relative and with the current feed department branch certain spacing of being separated by, the front end of branch's radiation electrode is arranged on the matrix surface identical with the radiation electrode part that does not comprise the feed part in the ring, and this front end is relative with the radiation electrode part that does not comprise feed part and the certain spacing of being separated by with it, divide spacing between the front end of relative branch's radiation electrode in feed part with current feed department, greater than the spacing between the front end of branch's radiation electrode in radiation electrode part that does not comprise the feed part and the ring relative with the radiation electrode part that does not comprise the feed part.
5. surface-mounted antenna according to claim 1 is characterized in that: the branch radiation electrode is arranged on the upper surface of dielectric matrix in the ring, and one of them of other branch's radiation electrode is arranged on the side surface of dielectric matrix.
6. surface-mounted antenna according to claim 1 is characterized in that: the branch radiation electrode has bigger width than in other branch's radiation electrode any in the ring.
7. surface-mounted antenna according to claim 1, it is characterized in that: on the dielectric matrix except loop-shaped radiation is set, at least one no feed radiation electrode also is set, and no feed radiation electrode that is provided with and the loop-shaped radiation certain spacing of being separated by, and carry out electromagnetic coupled with loop-shaped radiation, thereby make no feed radiation electrode under higher order mode, produce the double resonance state with loop-shaped radiation.
8. surface-mounted antenna according to claim 1, it is characterized in that: at least one side surface of branch's radiation electrode passes through otch in the ring of setting, near the radiation electrode part that partly extends to component from feed, and in the electrode part that the place of contiguous otch exists, the frequency adjustment member is set, set frequency adjustment member change changeably the width of otch and length at least one of them so that adjust the resonance frequency of radiation electrode.
9. surface-mounted antenna according to claim 1 is characterized in that: one of them of branch's radiation electrode that partly constitutes radiation electrode has the recess of the resonance frequency under the higher order mode that is used to be controlled at radiation electrode.
10. surface-mounted antenna according to claim 1, it is characterized in that: by the spacing between the ring electrode that encircles interior branch's radiation electrode and comprise another branch's radiation electrode is set, perhaps, can adjust the coupling of antenna by the spacing between partly of branch's radiation electrode and the radiation electrode that partly extends to component from the feed of radiation electrode in the ring is set.
11. surface-mounted antenna according to claim 1 is characterized in that: the spacing between beginning by branch radiation electrode in the ring is set and the primary radiation electrode relative with the described beginning, can adjust the resonance frequency under the higher order mode.
12. antenna equipment that comprises substrate and surface-mounted antenna according to claim 1.
13. antenna equipment according to claim 12, it is characterized in that: described substrate has the grounding electrode in the zone that is arranged on the installation region that does not comprise surface-mounted antenna at least, and described surface-mounted antenna is arranged on the non-ground area of substrate.
14. antenna equipment according to claim 12, it is characterized in that: on the dielectric matrix except loop-shaped radiation is set, at least one no feed radiation electrode also is set, set no feed radiation electrode and the loop-shaped radiation certain spacing of being separated by, and carry out electromagnetic coupled with loop-shaped radiation, thereby make no feed radiation electrode under higher order mode, produce the double resonance state with loop-shaped radiation.
15. antenna equipment according to claim 14 is characterized in that: a side of an end of no feed radiation electrode is connected with the grounding electrode of substrate by having the circuit that is arranged on the inductance on the substrate.
16. communication equipment that comprises surface-mounted antenna according to claim 1.
17. communication equipment that comprises antenna equipment according to claim 12.
18. communication equipment that comprises antenna equipment according to claim 14.
19. communication equipment that comprises antenna equipment according to claim 15.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002308480 | 2002-10-23 | ||
| JP2002308480 | 2002-10-23 | ||
| JP2003316853 | 2003-09-09 |
Publications (2)
| Publication Number | Publication Date |
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| CN1497774A CN1497774A (en) | 2004-05-19 |
| CN1288798C true CN1288798C (en) | 2006-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200310101493XA Expired - Fee Related CN1288798C (en) | 2002-10-23 | 2003-10-21 | Surface mounting antenna, antenna equipment and communication equipment using the antenna |
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| CN (1) | CN1288798C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101227202B (en) * | 2007-01-19 | 2011-07-27 | 鸿富锦精密工业（深圳）有限公司 | Electronic device |
| US8044863B2 (en) * | 2008-11-26 | 2011-10-25 | Research In Motion Limited | Low profile, folded antenna assembly for handheld communication devices |
| JP5003729B2 (en) | 2009-06-18 | 2012-08-15 | 株式会社村田製作所 | Antenna and wireless communication device |
| CN102576939B (en) * | 2009-10-16 | 2015-11-25 | 株式会社村田制作所 | Antenna and wireless ic device |
| JP5645121B2 (en) * | 2010-12-28 | 2014-12-24 | 三菱マテリアル株式会社 | Antenna device substrate and antenna device |
| US11682838B2 (en) | 2018-06-29 | 2023-06-20 | Nokia Shanghai Bell Co., Ltd. | Multiband antenna structure |
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