CN101432928A - Antenna structure and wireless communication device employing the same - Google Patents
Antenna structure and wireless communication device employing the same Download PDFInfo
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- CN101432928A CN101432928A CNA2007800156037A CN200780015603A CN101432928A CN 101432928 A CN101432928 A CN 101432928A CN A2007800156037 A CNA2007800156037 A CN A2007800156037A CN 200780015603 A CN200780015603 A CN 200780015603A CN 101432928 A CN101432928 A CN 101432928A
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Abstract
A radiation electrode 3 is formed on a substrate 2 of a surface mount antenna 1. One end 3G of the radiation electrode 3 forms a ground connection portion connected to ground, and the other end 3K of the radiation electrode 3 forms an open end. A ground connection electrode 4 for connecting the open end 3K of the radiation electrode 3 to ground via a capacitance is provided on the substrate 2. No feeding electrode for feeding power to the radiation electrode 3 is provided on the substrate 2. This surface mount antenna 1 is mounted on a non-ground region (a region on which a ground electrode 8 is not formed) of a board 6 so as to constitute an antenna structure 7. On the board 6 of the antenna structure 7, a feeding electrode 11 for capacitively feeding power to the radiation electrode 3 is provided.
Description
Technical field
The radio communication device that the present invention relates to be arranged on the antenna structure of radio communication devices such as portable telephone set and use this antenna structure.
Background technology
The example (for example with reference to patent documentation 1) of a kind of mode of existing surface-mounted antenna has been shown by the stereogram of signal in Fig. 8.This surface-mounted antenna 30 has dielectric base body 31.In dielectric base body 31, be formed with radiation electrode 32.In addition, in dielectric base body 31, be formed with current electrode 33 and earthy electrode 34.Radiation electrode 32 has frequency that predetermined radio communication uses as resonance frequency, carries out antenna work.One distolateral 32a ground connection of this radiation electrode 32.The distolateral 32b of another of this radiation electrode 32 is the open end.Above-mentioned current electrode 33 and radiation electrode 32 capacitive coupling are to radiation electrode 32 capacitances to supply power.The open end 32b capacitive coupling of earthy electrode 34 and radiation electrode 32 makes the open end 32b ground connection of radiation electrode 32.
For example, above-mentioned surface-mounted antenna 30 carries and works on the circuit substrate 36 of radio communication device.In this circuit substrate 36, be provided with ground area Zg and non-ground area Zf.Ground area Zg is the zone that is formed with ground electrode 37.Non-ground area Zf is the zone that does not form ground electrode 37.The predetermined setting position of the non-ground area Zf that surface-mounted antenna 30 carries at circuit substrate 36.Like this, by carrying surface-mounted antenna 30 at the setting position of circuit substrate 36, the radiation electrode 32 of surface-mounted antenna 30 be electrically connected to the ground electrode 37 and the ground connection of circuit substrate 36 a distolateral 32a.In addition, earthy electrode 34 also is electrically connected to the ground electrode 37 of circuit substrate 36.Thus, the open end 32b of radiation electrode 32 utilizes earthy electrode 34, arrives ground electrode 37 by capacity earth.And the current electrode 33 of surface-mounted antenna 30 is connected to and is formed on the high-frequency circuit 38 that for example radio communication on the circuit substrate 36 is used.
Surface-mounted antenna 30 structures as mentioned above.In the structure of this surface-mounted antenna 30, by the length of the end 32a side that connects from the ground of radiation electrode 32 to open end 32b, and the size of the open end 32b of radiation electrode 32 and the electric capacity between the earthy electrode 34, the resonance frequency of decision radiation electrode 32.In addition, by the position that forms of the total length of current electrode 33 and current electrode 33, the matching status of high-frequency circuit 38 sides that decision radiation electrode 32 and radio communication are used.
In Fig. 9 a, the example (for example with reference to patent documentation 2) of the another kind of mode of surface-mounted antenna is shown by the stereogram of signal.This surface-mounted antenna 40 has dielectric base body 41.In this dielectric base body 41, be formed with radiation electrode 42 and current electrode 43.Radiation electrode 42 carries out antenna work.One distolateral 42a of this radiation electrode 42 is connected to ground.The distolateral 42b of another of radiation electrode 42 is the open end.The open end 42b capacitive coupling of current electrode 43 and radiation electrode 42 is in order to form to radiation electrode 42 capacitances to supply power.
Shown in Fig. 9 a, the predetermined desired location of the non-ground area Zf that such surface-mounted antenna 40 is carried at circuit substrate 45.Carry surface-mounted antenna 40 by the setting position at circuit substrate 45, a distolateral 42a of the radiation electrode 42 of surface-mounted antenna 40 is electrically connected to the ground electrode 46 and the ground connection of circuit substrate 45.In addition, current electrode 43 is electrically connected to high-frequency circuit 47.High-frequency circuit 47 is formed in the circuit that the radio communication of circuit substrate 45 is used.Surface-mounted antenna 40 structures as above.In the structure of this surface-mounted antenna 40, by the size of the electric capacity between the open end 42b of current electrode 43 and radiation electrode 42, and the end 42a side that connects from the ground of radiation electrode 42 decides the resonance frequency of radiation electrode 42 to the length of open end 42b.
Patent documentation 1:JP spy opens flat 10-13139 communique
Patent documentation 2:JP spy opens the 2004-165965 communique
Summary of the invention
But in the structure of the surface-mounted antenna 30 of Fig. 8, the power supply of radiation electrode 32 (being the part of current electrode 33 to radiation electrode 32 capacitances to supply power) is in a distolateral 32a from radiation electrode 32 to the way of open end 32b.And the power supply of radiation electrode 32 is arranged on the good part of coupling of high-frequency circuit 38 sides that radiation electrode 32 and radio communication use.In other words, in order to carry out capacitances to supply power to radiation electrode 32 from current electrode 33, the good part of coupling of high-frequency circuit 38 sides of using in radiation electrode 32 and radio communication forms current electrode 33.
According to such structure, produce as follows defective.That is, not not equal because of for example machine of radio communication device, the circuit of high-frequency circuit 38 constitutes not simultaneously, in radiation electrode 32, can obtain different with the position of the part of the good coupling of high-frequency circuit 38 sides.For this reason, surface-mounted antenna 30 for example must change the formation position of current electrode 33 with respect to radiation electrode 32 by the machine of each radio communication device, so that radiation electrode 32 and high-frequency circuit 38 sides become good matching status.In other words, surface-mounted antenna 30, the machine design by each radio communication device becomes the antenna of machine special use for this reason.For this reason, surface-mounted antenna 30 is difficult to general.
With respect to this, in the surface-mounted antenna shown in Fig. 9 a 40, be the structure of current electrode 43 to the open end of radiation electrode 42 42b power supply.Thus, even if do not change the formation position of current electrode 43, also can access the good coupling of radiation electrode 42 and high-frequency circuit 47 sides.In other words, surface-mounted antenna 40 owing to be provided with the match circuit of the matching status of corresponding radiation electrode 42 and high-frequency circuit 47 on circuit substrate 45, just can access the good coupling of radiation electrode 42 and high-frequency circuit 47 sides.Based on this situation, surface-mounted antenna 40 is easy to general.Therefore, surface-mounted antenna 40 can realize that cost reduces.In addition, design alteration that surface-mounted antenna 40 can rapid corresponding radio communication device etc.
But, in surface-mounted antenna 40, be easy to generate problem as follows.In the structure of surface-mounted antenna 40, the maximum position of the electric field in the radiation electrode 42 is open end 42b, this open end 42b and current electrode 43 capacitive coupling.Surface-mounted antenna 40 with such structure has the such equivalent electric circuit shown in Fig. 9 b.And, the resonance frequency of radiation electrode 42 main with radiation electrode 42 itself with inductance (inductance) value, the electric capacity that reaches between radiation electrode 42 and the current electrode 43 is associated, and by its decision.The radiation electrode 42 of this surface-mounted antenna 40, and ground electrode 46 between, and and regard as ground around parts between, form such electric capacity (parasitic capacitance (stray the capacitance)) Cb shown in the dotted line of Fig. 9 b easily.This parasitic capacitance Cb, owing to can the resonance frequency of radiation electrode 42 be made a very bad impression, so can produce the problem that what is called causes the deterioration of antenna performance.
The present invention has structure as follows, as the device that is used to solve above-mentioned problem.Be antenna structure of the present invention, have:
Surface-mounted antenna has the structure that is formed with the radiation electrode that carries out antenna work in matrix; And
Substrate has the ground area that is formed with ground electrode and does not form the non-ground area of ground electrode,
This antenna structure has the structure of carrying above-mentioned surface-mounted antenna in the above-mentioned non-ground area of aforesaid substrate, it is characterized in that,
The one distolateral ground connecting portion that becomes the above-mentioned ground electrode ground connection of aforesaid substrate of the above-mentioned radiation electrode of above-mentioned surface-mounted antenna, the distolateral open end that becomes of another of above-mentioned radiation electrode, above-mentioned radiation electrode has from above-mentioned ground connecting portion to the way of above-mentioned open end by the power supply of capacitances to supply power
In the above-mentioned matrix of above-mentioned surface-mounted antenna, be formed with the open end capacitive coupling that is used for above-mentioned radiation electrode, the open end of this radiation electrode be electrically connected to the earthy electrode of the above-mentioned ground electrode of aforesaid substrate by electric capacity,
In aforesaid substrate, be formed with the current electrode that carries out capacitances to supply power to the power supply of the above-mentioned radiation electrode of above-mentioned surface-mounted antenna.
In addition, radio communication device of the present invention is characterized by setting and has the antenna structure of its specific structure in the present invention.
According to the present invention, be formed on distolateral ground connecting portion, the distolateral open end that becomes of another of radiation electrode of becoming of the radiation electrode in the matrix of surface-mounted antenna.In addition, in the matrix of surface-mounted antenna, be formed with the earthy electrode that is used for the open end of radiation electrode being connected to ground by electric capacity.The open end of radiation electrode is that electric field becomes maximum position, and capacity earth is passed through in its open end.Thus, radiation electrode, and be configured in around ground electrode between, and and be counted as ground parts between, be difficult to form parasitic capacitance.Thus, the present invention can suppress the deterioration of the antenna performance that parasitic capacitance causes.
In addition, in the present invention, constitute and in the matrix of surface-mounted antenna, do not form current electrode, on the substrate of configuration surface mount type antenna, form current electrode.Thus, in the present invention, the general possibility that becomes of surface-mounted antenna.Its reason is performed as follows explanation.
The circuit that is electrically connected to the high-frequency circuit that the radio communication of the radiation electrode of surface-mounted antenna uses constitutes, and is for example different because of the machine of radio communication device.Thus, because of machine of radio communication device etc., radiation electrode is different with the matching status of high-frequency electrical trackside.Thus, mate well, just must change formation position according to the machine of radio communication device with respect to the current electrode of radiation electrode in order to make radiation electrode and high-frequency electrical trackside.Thus, in the matrix of surface-mounted antenna, be formed with under the situation of current electrode, be necessary machine design alteration surface-mounted antenna by each radio communication device.
With respect to this, antenna structure of the present invention constitutes on the substrate that carries surface-mounted antenna current electrode is set, and does not form current electrode in the matrix of surface-mounted antenna.Thus, the present invention, under the situation of the machine that changes radio communication device, the formation position of only changing the current electrode of substrate gets final product, and need not change the design of surface-mounted antenna.In other words, in antenna structure of the present invention, surface-mounted antenna can become common surface-mounted antenna in the various wireless communication device, surface-mounted antenna general more or less freely.
In addition, because the present invention has the structure of reactance (reactance) portion of the resonance frequency that is provided for adjusting radiation electrode on substrate,, also can adjust the resonance frequency of change radiation electrode so do not carry out the design alteration of surface-mounted antenna.Thus, in the present invention, on substrate, be provided for adjusting the structure of reactive part of the resonance frequency of radiation electrode, make the general of surface-mounted antenna become easier.
In addition, owing to comprise having the structure that radiation electrode has a plurality of antenna resonance patterns of mutually different resonance frequency, so surface-mounted antenna makes the radio communication in mutually different a plurality of frequency bands become possibility.Thus, even a plurality of antennas are not set in radio communication device, the radio communication in a plurality of frequency bands also becomes possibility.Thus, comprise the radio communication device of the antenna structure with above-mentioned a plurality of antenna resonance patterns, the situation that a plurality of antennas must be set with radio communication device is compared, and can realize the miniaturization and the cost degradation of radio communication device.
In addition, in the present invention, current electrode also can be as the structure of antenna work, is not only radiation electrode, and current electrode also can be as antenna work.In other words, comprise that current electrode also can be as the antenna structure of the present invention of the structure of antenna work, the radio communication in a plurality of mutually different frequencies becomes possibility, can realize variation.Thus, owing to possess antenna structure of the present invention, just can realize the miniaturization and the cost degradation of radio communication device.
Description of drawings
Fig. 1 is the illustraton of model that is used to illustrate the antenna structure of the 1st embodiment.
Fig. 2 a is the stereogram that is used to illustrate an example of the surface-mounted antenna that constitutes antenna structure shown in Figure 1.
Fig. 2 b is the signal expanded view of the surface-mounted antenna of Fig. 2 a.
Fig. 2 c is the schematic circuit diagram of the surface-mounted antenna of Fig. 2 a.
Fig. 3 a is the figure that is used to illustrate other example of antenna structure.
Fig. 3 b is the figure that is used to illustrate other example of antenna structure.
Fig. 4 a is the figure that is used to illustrate the alternate manner example of radiation electrode.
Fig. 4 b is the figure that is used to illustrate the alternate manner example of radiation electrode.
Fig. 4 c is the figure that is used to illustrate the alternate manner example of radiation electrode.
Fig. 5 a is the figure that is used to illustrate the antenna structure of the 2nd embodiment.
Fig. 5 b is the figure that is used to illustrate the antenna structure of the 2nd embodiment.
Fig. 6 a is the figure that is used to illustrate the antenna structure of the 3rd embodiment.
Fig. 6 b is the figure that is used to illustrate the antenna structure of the 3rd embodiment.
Fig. 7 a is the stereogram that is used to illustrate other embodiment.
Fig. 7 b is the stereogram that is used to illustrate other embodiment.
Fig. 7 c is the expanded view that is used to illustrate other embodiment.
Fig. 8 is the figure that is used to illustrate a conventional example of surface-mounted antenna.
Fig. 9 a is the stereogram that is used to illustrate another conventional example of surface-mounted antenna.
Fig. 9 b is the circuit diagram that is used to illustrate another conventional example of surface-mounted antenna.
Symbol description
1 surface-mounted antenna, 2 matrixes
3 radiation electrodes, 4 earthy electrodes
6 circuit substrates, 7 antenna structures
8 ground electrodes, 11 current electrodes
12 high-frequency circuits
Embodiment
Below, the embodiment that the present invention is correlated with is described with reference to the accompanying drawings.
In Fig. 1, schematically represent the antenna structure of the 1st embodiment.The antenna structure 7 of this 1st embodiment is to carry surface-mounted antenna 1 on substrate 6.Have, substrate 6 for example is the circuit substrate of radio communication device again, and it illustrates aftermentioned.
Fig. 2 a extracts surface-mounted antenna shown in Figure 1, by the figure shown in the stereogram of signal.Fig. 2 b is the expanded view of signal of the surface-mounted antenna of Fig. 2 a.This surface-mounted antenna 1 for example has the rectangular-shaped matrix 2 that is formed by dielectric.In this matrix 2, be formed with radiation electrode 3 and earthy electrode 4.In the example of Fig. 2 a, Fig. 2 b, by rear end face 2B, 2T goes up elongation formation to radiation electrode 3 in the above from the bottom surface of matrix 2 2D side.This radiation electrode 3 is radiation electrodes of λ/4 types.One distolateral (end of bottom surface 2D side) 3G of this radiation electrode 3 becomes the ground connecting portion of ground connection.Another of radiation electrode 3 distolateral (end of top 2T side) 3K is the open end.Have, λ represents the wavelength of the electric wave that radio communication is used again.
In addition, by front end face 2F, 2T goes up elongation formation to grounding electrode 4 in the above from the bottom surface of matrix 2 2D side.The extension front end of this earthy electrode 4, with the open end 3K of radiation electrode 3 across arranged spaced.In addition, the extension front-end configuration of earthy electrode 4 and open end 3K between have the static capacity of predetermined setting the position.For with the open end 3K capacitive coupling of radiation electrode 3, and the open end 3K of radiation electrode 3 is connected to ground by electric capacity, form this earthy electrode 4.
In this 1st embodiment, surface-mounted antenna 1 is by above-mentioned such formation.In addition, this surface-mounted antenna 1 has equivalent electric circuit such shown in the solid line of Fig. 2 c.Thus, the main inductance value of the resonance frequency of radiation electrode 3 own with radiation electrode 3, and the open end 3K of radiation electrode 3 and the capacitor C g between the earthy electrode 4 be associated, and by its decision.Based on this situation, in surface-mounted antenna 1, design radiation electrode 3 makes it can have the resonance frequency of setting.In other words, one side is considered the dielectric constant of matrix 2, one side makes ground connecting portion 3G from the radiation electrode 3 relevant with the inductance value of radiation electrode 3 to the physical length of open end 3K, the open end 3K of radiation electrode 3 and the connection that are relative to each other such as capacitor C g between the earthy electrode 4, designs.
As shown in Figure 1, in the 1st embodiment, for example, surface-mounted antenna 1 carries on the substrate (circuit substrate) 6 of radio communication device, constitutes antenna structure 7.In circuit substrate 6, be provided with ground area Zg and non-ground area Zf.Ground area Zg is the zone that is formed with ground electrode 8.Non-ground area Zf is the zone that does not form ground electrode 8.In the antenna structure 7 of this 1st embodiment, configuration surface mount type antenna 1 is so that stride across the non-ground area Zf of circuit substrate 6.And the ground connecting portion 3G of a distolateral radiation electrode 3 of this surface-mounted antenna 1 and another distolateral earthy electrode 4 of surface-mounted antenna 1 are provided in respectively on the ground electrode 8, for example with welding and ground connection such as scolders.
And, in the non-ground area Zf of circuit substrate 6, form current electrode 11.Current electrode 11 is electrically connected to the high-frequency circuit 12 that the radio communication of radio communication device is used.In order to give the radiation electrode 3 of surface-mounted antenna 1, form current electrode 11 from the signal capacitances to supply power of high-frequency circuit 12.In the example of Fig. 1, the part of current electrode 11 is goed deep into the downside of the matrix 2 of surface-mounted antenna 1, across interval and radiation electrode 3 relative configurations.In the antenna structure 7 of this 1st embodiment, in radiation electrode 3, the position of current electrode 11 capacitances to supply power (that is the power supply of radiation electrode 3) is position as follows.In other words, this position is the part that can obtain the matched well of radiation electrode 3 and high-frequency circuit 12 sides as the position from ground connecting portion 3G to the way of open end 3K.
The equivalent electric circuit of the antenna structure 7 of this 1st embodiment is the equivalent electric circuits that increase the capacitor C a shown in the dotted line in the equivalent electric circuit of the surface-mounted antenna shown in Fig. 2 c 1.This capacitor C a is the electric capacity that is made of current electrode 11 and radiation electrode 3.In the antenna structure 7 of the 1st embodiment, the radiation electrode 3 of surface-mounted antenna 1, its two ends are ground connection respectively.Thus, capacitor C a is little to the relevant degree of the resonance frequency of radiation electrode 3, and capacitor C a is main relevant with the coupling of radiation electrode 3 and high-frequency circuit 12 sides.Based on this situation, in the resonance frequency by radiation electrode 3 and capacitor C g decision, capacitor C a is set to the capacity of the good coupling that can access radiation electrode 3 and high-frequency circuit 12 sides.And the size of design current electrode 11 etc. are so that can become the capacity of this setting.
Have again, in order to obtain the matched well of radiation electrode 3 and high-frequency circuit 12 sides, also can be shown in Fig. 3 a.In other words, the path of the electricity of part and ground in the way that connects self-powered electrode 11 tremendously high frequency circuit 12 can be set, the capacitor C c that coupling usefulness is set in this path forms surface-mounted antenna 1.
In addition, in the radio communication device of a plurality of machines, carry under the situation of surface-mounted antenna 1, have the situation that only is difficult to carry out the radio communication in desirable frequency band with surface-mounted antenna 1.Its reason is because surface-mounted antenna 1 is not designed to certain radio communication device special use in a plurality of machines.In the case, for example as follows, capacitor (condenser) portion by being provided as reactive part in circuit substrate 6 and as inductor (inductor) portion of reactive part just can carry out the radio communication in desirable frequency band.
For example, only use surface-mounted antenna 1, resonance frequency uprises and is difficult to carry out under the situation of the radio communication in desirable frequency band, shown in the dotted line of Fig. 3 b, inductor portion 13 is set.That is, be arranged on circuit substrate 6, on the guiding path of ground connecting portion that connects radiation electrode 3 and ground electrode 8, in series be provided as the inductor portion 13 of reactive part.Thus, can pay the inductance composition, can reduce the resonance frequency of radiation electrode 3 radiation electrode 3.Based on this situation, for example, have the inductor portion 13 of the inductance value that is used to revise the part high by design, just can access the antenna structure that in desirable frequency band, carries out radio communication with respect to the resonance frequency of the surface-mounted antenna 1 of the resonance frequency of purpose.
In addition, shown in the dotted line of Fig. 3 b,, also can adjust the resonance frequency of radiation electrode 3 even capacitor department 14 is set.In other words, be arranged on circuit substrate 6, on the guiding path that connects earthy electrode 4 and ground electrode 8, in series be provided as the capacitor department 14 of reactive part, radiation electrode 3 is paid electric capacity.Even this capacitor department 14 is set, radiation electrode 3 is paid electric capacity, also can adjust the resonance frequency of radiation electrode 3.In other words, even if such capacitor department 14 is set, also can access the antenna structure that in desirable frequency band, carries out radio communication.
And, undoubtedly, also can inductor portion 13 and capacitor department 14 be set both sides, become the structure of carrying out the radio communication in the desirable frequency band.Have, inductor portion 13 and capacitor department 14 can be made of the electronic component (reactance component) with inductance (inductance) or electric capacity (capacitance) again.In addition, inductor portion 13 and capacitor department 14 can also be made of the wiring that forms on circuit substrate 6 (conductor pattern).
Have, in the example of Fig. 1～shown in Figure 3, though radiation electrode 3 is banded, radiation electrode 3 also can adopt other shape again.For example, shown in Fig. 4 a, can on radiation electrode 3, form slit S, make radiation electrode 3 become spiral (spiral) shape.In addition, shown in Fig. 4 b, radiation electrode 3 also can a part or whole part become bending.And shown in Fig. 4 c, radiation electrode 3 also can become helix (helical) shape.
The radiation electrode 3 of such shape shown in Fig. 4 a～Fig. 4 c is compared with radiation electrode 3 shown in Figure 1, and electrical length can extend.In other words, the radiation electrode 3 of such shape shown in Fig. 4 a～Fig. 4 c is compared with radiation electrode 3 shown in Figure 1, can increase the inductance value that radiation electrode 3 has.Thus, the radiation electrode 3 of such shape can be realized the miniaturization of radiation electrode 3 shown in Fig. 4 a～Fig. 4 c, can realize the miniaturization of matrix 2.Thus, the radiation electrode 3 of such shape shown in Fig. 4 a～Fig. 4 c can be realized surface-mounted antenna 1 and use the miniaturization of its antenna structure 7.
Below, the 2nd embodiment is described.Have again, in the explanation of this 2nd embodiment, give same-sign, omit the repeat specification of its common part the structure division identical with the 1st embodiment.
In this 2nd embodiment, radiation electrode 3 has a plurality of antenna resonance patterns that have mutually different resonance frequency.Antenna structure 7 is for carrying out the structure of the radio communication in mutually different a plurality of frequency band.Have in the structure of a plurality of antenna resonance patterns at radiation electrode 3 being used for, various structures are arranged, can have arbitrary structure.If for example, for example, the such structure shown in the such structure shown in Fig. 5 a and Fig. 5 b is arranged.
In Fig. 5 a example, radiation electrode 3 is branching into a plurality of (being 2 in the example of Fig. 5 a) from the position of connecting portion 3G in the way of open end 3K, ground.In radiation electrode 3, be formed with a plurality of branching electrode 15a, 15b.In other words, in radiation electrode 3, be provided with from the open end 3K incision of this radiation electrode 3 and the slit 20 that forms to ground connecting portion 3G elongation.Then, be formed with a plurality of branching electrode 15a, the 15b that slit 20 thus forms.For example, constitute branching electrode 15a, so that can have the 1st antenna resonance pattern of resonance in predetermined resonance frequency.In addition, constitute branching electrode 15b, so that can have the 2nd higher antenna resonance pattern of the 1st antenna resonance pattern resonance frequency of comparing.Utilize such branching electrode 15a, 15b, radiation electrode 3 can have a plurality of antenna resonance patterns.
In the example of Fig. 5 b, radiation electrode 3 has body 3 ' and floating electrode (floatingelectrode) 16.Body 3 ', one distolateral be ground connecting portion 3G, another is distolateral to be open end 3K.Constitute radiation electrode 3, so that the frequency excitation of using with predetermined radio communication, carry out antenna work.In addition, floating electrode 16 is by being formed on slit 21 and body 3 on the radiation electrode 3 ' separate.This floating electrode 16 and body 3 ' electromagnetic coupled, and, be the electrode that electricity suspends.Constitute this floating electrode 16, so that the frequency excitation of using with the predetermined radio communication different, carry out antenna work with the resonance frequency of body 3 ' have.Utilize such body 3 ' and floating electrode 16, radiation electrode 3 just can have a plurality of antenna resonance patterns.
The above-mentioned structure in addition of the 2nd embodiment is identical with the 1st embodiment.In this 2nd embodiment, radiation electrode 3 has a plurality of antenna resonance patterns that have mutually different resonance frequency.Thus, possess the surface-mounted antenna 1 of the 2nd embodiment or the antenna structure 7 of this surface-mounted antenna 1 and can suppress to maximize, and can make its variation.
The 3rd embodiment below is described.Have again, in the explanation of this 3rd embodiment, give same-sign, omit the repeat specification of its common part the structure division identical with the 1st or the 2nd each embodiment.
In the antenna structure 7 of this 3rd embodiment, current electrode 11 also can be as antenna work.In other words, current electrode 11 has frequency that predetermined radio communication uses as resonance frequency, can carry out antenna work.Also can there be various structures in the structure as antenna work at current electrode 11, can have arbitrary structure.The one example shown in Fig. 6 a, is the example of structure that current electrode 11 becomes inverse-F antenna.In addition, another example shown in Fig. 6 b, is the example that current electrode 11 becomes the shape of loop aerial.Have again, in Fig. 6 a and Fig. 6 b, the radiation electrode 3 in the omission matrix 2 and the diagram of earthy electrode 4.
Structure outside this 3rd embodiment above-mentioned is identical with the 1st or the 2nd embodiment.The 3rd embodiment like this like this owing to be that current electrode 11 is also as the structure of antenna work, so can realize the variation of antenna structure 7.Especially, having so diversified surface-mounted antenna 1 shown in the 2nd embodiment and current electrode 11 also makes the radio communication in multiband more become possibility as the structure of antenna work.Thus, have so diversified surface-mounted antenna 1 shown in the 2nd embodiment and current electrode 11 and also can provide the antenna structure 7 that promotes further a plurality ofization as the structure of antenna work.
The 4th embodiment below is described.This 4th embodiment relates to the example of radio communication device.The radio communication device of this 4th embodiment is provided with the antenna structure 7 shown at least one each embodiment of the 1st～the 3rd.There are various structures in the structure of the radio communication device outside this, can adopt arbitrary structure, omit its explanation at this.In addition, because the structure of the surface-mounted antenna 1 of each embodiment of the 1st～the 3rd and antenna structure 7 is above-mentioned, so also omit the explanation of this formation.
Have again, the invention is not restricted to the mode of each embodiment of the 1st～the 4th, can adopt the mode of various enforcements.For example, in each embodiment of the 1st～the 4th, though the matrix 2 of surface-mounted antenna 1 is rectangular-shaped, matrix 2 also can be other a shape such as cylindric, triangle column, polygonal column.
In addition, in the example of this Fig. 1～Fig. 6, the open end 3K of the radiation electrode 3 of configuration surface mount type antenna 1 on the 2T on matrix 2.In addition, extend to form earthy electrode 4 on the 2T in the above from the front end face 2F of matrix 2, this extends the open end 3K capacitive coupling of front end and radiation electrode 3.But, for example, shown in Fig. 7 a, also can constitute, the open end 3K of configuration radiation electrode 3 on the front end face 2F of matrix 2, earthy electrode 4 is in the open end 3K capacitive coupling of the front end face 2F and the radiation electrode 3 of matrix 2.In addition, also can be shown in Fig. 7 b.In the structure of Fig. 7 b, the open end 3K of radiation electrode 3 is configured on the top 2T of matrix 2.In addition, earthy electrode 4 is configured on the front end face 2F of matrix 2.And, become the open end 3K of radiation electrode 3 of top 2T and the earthy electrode 4 capacity coupled structures of front end face 2F.And, can also be for shown in the expanded view of Fig. 7 c.In the structure of Fig. 7 c, the open end 3K of radiation electrode 3 is configured on the top 2T of matrix 2.In addition, earthy electrode 4 is formed on the bottom surface 2D of matrix 2.And, become the open end 3K of radiation electrode 3 of top 2T and the earthy electrode 4 capacity coupled structures of bottom surface 2D.
Also have in addition, radiation electrode 3 or grounding electrode 4 also can be formed on to a part or whole part the inside of matrix 2.Like this, the formation position separately of the open end 3K of radiation electrode 3 and grounding electrode 4 can suitably be set according to the capacity of requirement predetermined between the open end 3K of radiation electrode 3 and the grounding electrode 4, is not defined.
And in the example of the antenna structure shown in Fig. 1～Fig. 7 c, the part of current electrode 11 is goed deep into the downside configuration of surface-mounted antenna 1.But a part that yet can current electrode 11 is not goed deep into the downside of surface-mounted antenna 1.In other words, current electrode 11 can be formed on have predetermined electric capacity (electric capacity that promptly mates usefulness) can with the radiation electrode 3 capacity coupled positions of surface-mounted antenna 1.
The present invention can make the deterioration that do not cause antenna performance and carry surface-mounted antenna of the same race become possibility in the various wireless communication device.Thus, the present invention is preferably as the antenna structure and the radio communication device thereof that are possessed in the radio communication devices such as portable phone that require varied machine.
Claims (6)
1. antenna structure has:
Surface-mounted antenna has the structure that is formed with the radiation electrode that carries out antenna work in matrix; And
Substrate has the ground area that is formed with ground electrode and does not form the non-ground area of ground electrode,
This antenna structure has the structure of carrying above-mentioned surface-mounted antenna in the above-mentioned non-ground area of aforesaid substrate, it is characterized in that,
The one distolateral ground connecting portion that becomes the above-mentioned ground electrode ground connection of aforesaid substrate of the above-mentioned radiation electrode of above-mentioned surface-mounted antenna, the distolateral open end that becomes of another of above-mentioned radiation electrode, above-mentioned radiation electrode has from above-mentioned ground connecting portion to the way of above-mentioned open end by the power supply of capacitances to supply power
In the above-mentioned matrix of above-mentioned surface-mounted antenna, be formed with the open end capacitive coupling that is used for above-mentioned radiation electrode, by electric capacity the open end of this radiation electrode is electrically connected to the earthy electrode of the above-mentioned ground electrode of aforesaid substrate,
In aforesaid substrate, be formed with the current electrode that carries out capacitances to supply power to the power supply of the above-mentioned radiation electrode of above-mentioned surface-mounted antenna.
2. antenna structure according to claim 1 is characterized in that, is formed with the slit in above-mentioned radiation electrode, and this slit is used to form a plurality of antenna resonance patterns with mutually different resonance frequency.
3. according to claim 1 or the described antenna structure of claim 2, it is characterized in that current electrode has the frequency of predetermined communication usefulness as resonance frequency, also can be as antenna work.
4. according to claim 1 each described antenna structure to the claim 3, it is characterized in that, in substrate, be provided with the guiding path of the ground electrode of the ground connecting portion that is used to connect radiation electrode and aforesaid substrate, in this guiding path, be inserted with the reactive part of the resonance frequency that is used to control radiation electrode.
5. according to claim 1 each described antenna structure to the claim 3, it is characterized in that, in substrate, be provided with the guiding path of the ground electrode of the earthy electrode that is used to connect surface-mounted antenna and aforesaid substrate, in this guiding path, be inserted with the reactive part of the resonance frequency that is used to control radiation electrode.
6. a radio communication device is characterized in that, is provided with claim 1 each described antenna structure to the claim 5.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006254565 | 2006-09-20 | ||
| JP254565/2006 | 2006-09-20 | ||
| JP053077/2007 | 2007-03-02 |
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| Publication Number | Publication Date |
|---|---|
| CN101432928A true CN101432928A (en) | 2009-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800156037A Pending CN101432928A (en) | 2006-09-20 | 2007-08-21 | Antenna structure and wireless communication device employing the same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142596A (en) * | 2009-12-09 | 2011-08-03 | Tdk株式会社 | Antenna device |
| CN103050781A (en) * | 2011-08-23 | 2013-04-17 | 苹果公司 | Distributed loop antennas |
| CN103563173A (en) * | 2011-05-25 | 2014-02-05 | 株式会社村田制作所 | Antenna device and communication terminal device |
| CN104737367A (en) * | 2012-10-11 | 2015-06-24 | 微软公司 | Multiband antenna |
| CN106816706A (en) * | 2015-11-30 | 2017-06-09 | 深圳富泰宏精密工业有限公司 | Antenna structure and the radio communication device using the antenna structure |
-
2007
- 2007-08-21 CN CNA2007800156037A patent/CN101432928A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102142596A (en) * | 2009-12-09 | 2011-08-03 | Tdk株式会社 | Antenna device |
| US8525732B2 (en) | 2009-12-09 | 2013-09-03 | Tdk Corporation | Antenna device |
| CN103563173A (en) * | 2011-05-25 | 2014-02-05 | 株式会社村田制作所 | Antenna device and communication terminal device |
| CN103050781A (en) * | 2011-08-23 | 2013-04-17 | 苹果公司 | Distributed loop antennas |
| US8963794B2 (en) | 2011-08-23 | 2015-02-24 | Apple Inc. | Distributed loop antennas |
| CN103050781B (en) * | 2011-08-23 | 2015-09-02 | 苹果公司 | Distributed ring antenna |
| CN104737367A (en) * | 2012-10-11 | 2015-06-24 | 微软公司 | Multiband antenna |
| CN104737367B (en) * | 2012-10-11 | 2018-12-04 | 微软技术许可有限责任公司 | Multiband antenna |
| US10224630B2 (en) | 2012-10-11 | 2019-03-05 | Microsoft Technology Licensing, Llc | Multiband antenna |
| CN106816706A (en) * | 2015-11-30 | 2017-06-09 | 深圳富泰宏精密工业有限公司 | Antenna structure and the radio communication device using the antenna structure |
| CN106816706B (en) * | 2015-11-30 | 2020-07-14 | 深圳富泰宏精密工业有限公司 | Antenna structure and wireless communication device using same |
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Application publication date: 20090513 |