CN1442930A - Medium antenna of high frequency radio communication equipment - Google Patents
Medium antenna of high frequency radio communication equipment Download PDFInfo
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- CN1442930A CN1442930A CN 03105115 CN03105115A CN1442930A CN 1442930 A CN1442930 A CN 1442930A CN 03105115 CN03105115 CN 03105115 CN 03105115 A CN03105115 A CN 03105115A CN 1442930 A CN1442930 A CN 1442930A
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Abstract
A dielectric antenna is provided for a high frequency wireless communication apparatus. The antenna includes a dielectric substrate and a conductive meander line layer formed on the dielectric substrate. A conductive feed line layer, having a greater line width than the width of the meander line layer, is also formed on the dielectric substrate. A conductive taper layer connects the conductive meander line layer to the conductive feed line layer. An edge of the conductive taper layer slants at an angle from an adjacent edge of the conductive feed line layer in a direction toward the conductive meander line layer.
Description
Invention field
The present invention relates to the antenna that radio communication is used, the high-frequency wireless communication dielectric antenna that is specifically related to have the so-called meander line structure that on medium substrate, forms.
Background of invention
Antenna is a kind of requisite building block in the radio communication, but relatively says, antenna has the shortcoming that consumes or take big quantity space.In order to reduce the size of antenna, known antenna structure working medium material, and at the top or the inner antenna line that forms of dielectric material.In No. 13126/1998 Japanese patent gazette, antenna one example according to the prior art is described.In order to suppress or to reduce the temperature rise (heating) that the power loss by radiation electrode causes, and the antenna in order to provide wavelength fluctuation to reduce, antenna has formation shown in Figure 13.With reference to Figure 13, antenna 2100 comprises: helix radiation electrode 2102, and it is formed on the outer surface of dielectric insulator 2101; Another electrode 2103, it is electrically connected with radiation electrode 2102, and the line width of this another electrode 2103 is greater than the line width of radiation electrode 2102; And feeder line end 2104, it is electrically connected with electrode 2103, is used for high-frequency signal is offered radiation electrode 2102 and another electrode 2103.Constitute according to this, electrode 2103 discharges the heat that the power loss by radiation electrode 2102 causes, and can suppress or reduce the temperature rise of radiation electrode 2102 and dielectric insulator 2101.As a result, can reduce the fluctuation of antenna wavelength.
When cutting down antenna size to realize miniaturization, that is: when satisfying space requirement, the antenna traces width, that is: the conductor width that forms antenna becomes quite little.When the antenna circuit was linearity configuration, the physical length of antenna must increase.Therefore, in order to save the space, antenna traces adopts wavy shape to form, for example resemble the 3rd, 114, shown in No. 582 Japan Patents and the 55618/1997th and No. 139621/1997 Japanese patent gazette like that.In this antenna, by adopting wavy shape, the antenna traces width is further shortened, to realize the shortening of antenna length.
In general, because the requirement of impedance matching, the quantity of element is many more, and antenna size is just big more.And, more likely can and the component package substrate on circuit between impedance takes place does not match, thereby cause the deterioration of radio-wave radiation characteristic.That is to say, more be difficult to effectively the high-frequency signal that provides from the feeder line end be sent to antenna traces.Do not match in order to control this impedance, generally the length of antenna traces is adjusted.Yet, consider the space requirement that rises steadily, that is: because the miniaturization requirement can not change antenna traces length arbitrarily.And, although know between the circuit of component package substrate-side and antenna traces and insert match circuit, tend to increase production cost yet set up this match circuit, and consume too much space, certainly, this runs in the opposite direction with the miniaturization requirement.
There is various factors can cause the impedance between antenna traces and the feeder line end parts not match.For example, when making that owing to design limit the antenna traces width is different from the signal transmission with feed-in band line width, when particularly making the antenna traces width less than feed-in band line width owing to antenna miniaturization, most possibly the impedance mismatch problem can take place.
Summary of the invention
The purpose of this invention is to provide a kind of dielectric antenna, this dielectric antenna can be eliminated the impedance that is caused by antenna miniaturization and not match, and do not set up special-purpose match circuit, thereby and can be effectively and prevent the decline of the radio-wave radiation efficient that causes economically because impedance does not match.
According to a first aspect of the invention, above-mentioned purpose of the present invention is to realize by the dielectric antenna that a kind of high frequency wireless communication apparatus is provided, and this dielectric antenna comprises: medium substrate; Conduction meander line layer, it is formed on the medium substrate; The electrically-conductive feed line layer, it is formed on the medium substrate, and the line width of this electrically-conductive feed line layer is greater than the line width of meander line layer; And conduction conial layer, it makes conduction meander line layer be connected with the electrically-conductive feed line layer, and the conductive layer of this conduction conial layer has sloping edge, and this sloping edge is in the direction towards conduction meander line layer, form angle γ with the joining edge of electrically-conductive feed line layer, this angle γ comprises 110 °～175 ° angle.
In the present embodiment, the formation of conduction conial layer can effectively realize impedance matching, does not save and do not influence the space of being brought by antenna miniaturization, and good radio-wave radiation characteristic can be provided.
According to a further aspect in the invention, this dielectric antenna comprises first wire portion and second wire portion, this first wire portion and second wire portion are formed on the medium substrate of antenna, and be electrically connected mutually by the connection wire portion with conical in shape, this conical in shape is expanded towards the second wire portion side from the first wire portion side according to the predetermined taper angle on width.When the bevel angle of this connection wire portion was 5 °～70 ° (preferably 8 °～68 ° more preferably is 10 °～60 °), antenna can suppress impedance and not match, and can effectively make the high-frequency signal radiation.
According to a further aspect in the invention, above-mentioned purpose of the present invention is to realize by the dielectric antenna that a kind of high frequency wireless communication apparatus is provided, and this antenna comprises: medium substrate; Conduction meander line layer, it is formed on the medium substrate; The electrically-conductive feed line layer, it is formed on the medium substrate, and the line width of this electrically-conductive feed line layer is greater than the line width of meander line layer; And extension feeder line, its feeder line band that forms from the surface at another medium substrate extends, the dielectric constant of this another medium substrate is less than the dielectric constant of above-mentioned medium substrate, and this another medium substrate is provided with ground plane on its another counter surface, the feeder line of this extension is from the position definite length extended of grounding electrode termination, and separates by another medium substrate; This predetermined length is about 2.5～7.5mm.
Of the present invention aspect this, by the extension feeder line is set, can effectively eliminate by the top medium substrate that forms the feeder line band and above form the impedance that the unit dielectric constant difference between the medium substrate of the antenna that comprises conduction meander line layer causes and do not match.
According to a further aspect in the invention, by the important feature of each embodiment of the invention described above is combined, can realize the coupling improvement.
According to a further aspect in the invention, provide various sizes factor and the relation relevant with the antenna meander line, this can improve the performance of dielectric antenna.
In the detailed description of following the preferred embodiments of the present invention, will propose other characteristics of the present invention and advantage, will understand other characteristics of the present invention and advantage perhaps below this, describing in detail.
Description of drawings
Fig. 1 is the perspective view according to the dielectric antenna of first embodiment of the invention;
Fig. 2 is the perspective view that illustrates according to another enforcement of the dielectric antenna of first embodiment of the invention;
Fig. 3 illustrates exemplary high-frequency wireless communication circuit module, is included in the perspective view of the dielectric antenna that is provided with on the medium substrate of this circuit module;
Fig. 4 is the profile of the dielectric antenna that is provided with on medium substrate, the figure shows feeder line according to a further aspect of the invention.
Fig. 5 is the perspective view of dielectric antenna according to another embodiment of the present invention, and wherein, this antenna is formed directly on the medium substrate, and this medium substrate is provided with the high-frequency wireless communication circuit module;
Fig. 6 (a), Fig. 6 (b) and Fig. 6 (c) show three kinds of different formations of the meander line portion of antenna according to a further aspect of the invention respectively;
Fig. 7 is the figure that illustrates by to measuring the experimental result that is obtained in the length and the relation between the corresponding reflection coefficient S11 of the extension feeder line of representing with β;
Fig. 8 illustrates the figure that measures the experimental result that is obtained by to the inflection width (d) and the relation between the reflection coefficient S11 of meander line model;
Fig. 9 is illustrated in the unit dielectric constant of the medium substrate that is provided with antenna and the figure of the relation between the reflection coefficient S11;
Figure 10 is the figure that is illustrated in the relation between the length of the width (w) that is formed at the meander line on the medium substrate and meander line;
Figure 11 is the perspective view of the co-plane waveguide that constitutes the feeder line band according to a further aspect of the invention;
Figure 12 (a) is the profile of the dielectric antenna that formed by the laminated medium substrate according to another embodiment of the present invention;
Figure 12 (b) is illustrated in the size of the dielectric antenna of stack in the medium substrate shown in Figure 12 (a) and the plane graph of formation; And
Figure 13 is the perspective view of above-mentioned dielectric antenna according to prior art.
Embodiment
Hereinafter with reference to accompanying drawing,, the embodiment according to first aspect present invention is described particularly with reference to Fig. 1.
With reference to Fig. 1, dielectric antenna 1 comprises: medium substrate 2, and it typically adopts aluminium oxide ceramics to make, and has rectangular solid shaped; And wire portion 220, it typically adopts silver (Ag) to form, and smokes on a first type surface 1u of medium substrate 2 and form.This wire portion 220 comprises: conduction meander line layer or element 202, electrically-conductive feed line layer or element 204, and conduction conial layer or element 203.Conial layer 203 makes an end of meander line layer 202 be connected with feeder line layer 204, and has edge 203A, and this edge 203A that is: becomes an angle lapping oblique with this joining edge 204A tilting towards the direction of the meander line layer 202 joining edge 204A with respect to feeder line layer 204.The angle γ that forms between these two edges is 110 °～175 °, more preferably is 120 °～170 °.The other end 212 of meander line layer 202 is not have the electricity end.The other end 214 of feeder line layer 204 is connected with the line feed terminals 205 that forms on the abutting end of medium substrate 2.
Use formation shown in Figure 2, prepared and the corresponding dielectric antenna of above-mentioned these characteristics, be provided with down experiment and use.In exemplary enforcement, to weighing as aluminium oxide, titanium oxide and the tin oxide of medium substrate 2 raw-material scheduled volumes and mix, and mixed-powder is carried out compression molded.Then, molded product is fired.The molded product of so firing is cut into medium substrate 2, and as implementing at this, this medium substrate 2 is a rectangular solid shaped, and width is 2.5mm, and length is 11mm, highly is 0.8mm.By silk screen printing the conductive paste of being made up of the Ag as main component is printed on the first type surface 1u of medium substrate 2, and this conductive paste is smoked to form wire portion 220.Adopt same way as to form line feed terminals 205.After smoking, wire portion 220 comprises: meander line layer or portion 202, and its line width (w) is 0.3mm, and line segregation is 0.3mm, and inflection width (d) is 1.5mm; Feeder line layer or portion 204, its line width (w2) is 1.5mm; And conial layer or portion 203, its bevel angle α is respectively 5 °, 16 °, 31 °, 50 ° and 70 °.Below with reference to Fig. 6 (a), parameter s and d are described in more detail.As shown in the figure, adopt the quantity of " loop " of tortuous or the formation that rises and falls to be about three.
In this way, made five kinds of antennas at the 5.2GHz frequency band, various antennas all have different bevel angle α, and the formation of various antennas all the formation with shown in Figure 2 is similar.
In order to compare, made a kind of antenna with this antenna traces pattern, this antenna traces pattern comprises: first wire portion 202, and it has line width same as the previously described embodiments (w), identical line segregation (s) and identical inflection width (d); And feeder line layer 204, it has the line width identical with these embodiment (w2), but has 90 ° angle α and γ (that is to say, cancelled conial layer or portion 203).
In compare test, each antenna all engages with the assessment substrate, and the use network analyzer during to 5.2GHz the reflection coefficient of this antenna measure.Following table 1 is the results list.
Table 1
| Bevel angle α (°) | Reflection coefficient (dB) | |
| | ????5 | ?????-35.140 |
| | ????16 | ?????-37.840 |
| | ????31 | ?????-57.550 |
| | ????49 | ?????-36.325 |
| | ????70 | ?????-34.985 |
| Comparative example | Zero | ?????-32.854 |
To be understood that and not have conical in shape and compare with the example that comparative example is represented from table 1, all have conical in shape, comprise that conial layer or portion 203 and the example of representing with embodiment 1～5 show that reflection coefficient and transmitting efficiency all are improved that is:.But also what confirm is that the conical in shape difference between Fig. 1 and Fig. 2 can not cause antenna performance significantly to change, as using that reflection coefficient and transmitting efficiency measure.Yet only from practical point of view, the formation of Fig. 2 can be preferred, because the formation of constituent ratio Fig. 1 of Fig. 2 is simple.
With reference to Fig. 3, according to a further aspect in the invention, show dielectric antenna 1 according to another embodiment, this dielectric antenna 1 is arranged on another medium substrate that forms Anneta module 40.In Fig. 3, comprise that the various electronic components of dielectric antenna 1 and antenna circuit element 43 are arranged on the medium substrate of Anneta module 40.
With reference to Fig. 4, on second medium substrate 42, form feeder line band 10, so that the back side of relevant ground connection backside conductive layer 11 overwrite media substrates 42.The packaging area or the installation position of the medium substrate 2 of dielectric antenna 1 is arranged in zone 12 on corresponding with the zone 12 ' that does not form ground connection back side lead 11 first type surface of representing with MP.
Longitudinal extension feeder line 10e is 205 definite length extended from feeder line band 10 to line feed terminals, this predetermined length represents with β, this longitudinal extension feeder line 10e be from in the zone of backside conductive layer 11 with do not form the corresponding position extension in boundary line (BL) between the zone of back side conductor layer 11.Surface encapsulation pad 5 is formed on the back side of dielectric antenna 1, is used for by weld part 9 line feed terminals 205 firmly being connected with the end of extending feeder line 10e.Form auxiliary pad 6 at the back side of medium substrate 2, so that engage with the supporting pad 15 that on substrate 42, forms by weld part 9.
The feeder line 10e that extends is reducing or preventing that impedance between dielectric antenna 1 and feeder line band 10 from being important aspect not matching, by the feeder line band 10 transmitting-receiving signals of telecommunication.As mentioned above, conventionally, between dielectric antenna and feeder line band, be provided with matching element.If in the medium substrate 42 of circuit module 41, be provided with feeder line 10, then need not matching element, wherein, the unit dielectric constant of medium substrate 42 is less than the unit dielectric constant of the medium substrate 2 of dielectric antenna 1.
As from the figure of Fig. 7, understanding, can find that the appropriate length β that extends feeder line 10e is about 2.5mm～7.5mm.
And, as shown in figure 11, on same first type surface MP, form feeder line band 110 and extend feeder line 110e, and on this same first type surface MP, can form two ground connection back side lead 111e, and, ground connection back side lead 111e is clipped in the middle feeder line band 110, that is: ground connection back side lead 111e is arranged on the opposite sides thereof.
With reference to Fig. 5, according to a further aspect in the invention, as shown in Figure 5, can use the common substrate of a medium substrate 42 as a plurality of elements, that is: as the medium substrate of antenna 3, be provided with the substrate of the various electronic components of associated antenna circuit module above also can be used as with conduction meander line layer 202, conduction conial layer 203 and electrically-conductive feed line layer 204.
With reference to Fig. 6 (a)～6 (c), according to a further aspect in the invention, to shown in Fig. 6 (c), should conscientiously design and constitute conduction meander line layer as Fig. 6 (a), to obtain best antenna performance, especially aspect line width (w), line segregation (s) and inflection width (d).
Below will describe according to being done result of experiment by the influence of checking complications or inflection width (d).At first, in these experiments, use aluminum oxide substrate (thickness: 1mm) as dielectric antenna substrate 2.Make the dielectric antenna that total track length is 30mm, wherein, can adopt various combinations to change inflection width (d), line width (w) and opposed edge (s) at interval.These antenna all connects with network analyzer (HP-8510C, by Hewlett-Packard (Hewlett Packard Co.) produce), and the reflection coefficient S11 of various antennas measures during to 2.4GHz.Fig. 8 shows the result.Following table 2 is tabulations of each measure dot number certificate of Fig. 8.
Table 2
| ????w/s | ????1/1 | ????0.5/1 | ????1/2 |
| Circuit (d=1) | ????-17.38 | ????-16.02 | ?????- |
| Circuit (d=2) | ????-13.44 | ?????- | ?????- |
| Circuit (d=3) | ????-9.32 | ?????- | ????-8.98 |
| Circuit (d=5) | ????-6.10 | ????-4.2 | ?????- |
These experimental results that to tabulate from table 2 are understood that (w) is more little for line width, and reflection coefficient (S11) is just more little, and this has nothing to do with line width (w) and opposed edge interval (s), and can improve the radiation efficiency of radio wave.It will also be understood that,, can obtain-8dB or following antenna gain value the antenna gain value of that is: satisfying the demand when inflection width (d) during less than 3mm.
When the unit dielectric constant that makes the dielectric material that forms antenna substrate 2 increases, can shorten antenna length.Yet this can cause in some cases, because non-loaded increase makes radio-wave radiation efficient reduce and/or bandwidth is narrower.In view of this, the dielectric material that forms antenna substrate 2 preferably has when 2.4GHz and is not more than 13 unit dielectric constant.Alumina content is that at least 98% aluminium oxide ceramics, mullite pottery or glass ceramics can be suitable for dielectric loss less material in high-frequency range in substrate of the present invention.In glass ceramics, preferably use a kind of ceramic system, this ceramic system is by being 1/40th～60 add to Pyrex or lead borosilicate glass such as the such inorganic filler of aluminium oxide and prepare by weight, because this composition has good common burning (co-firing) characteristic, and on the top of its this ceramic system or inner metallic circuit or the element of forming.And, can use such as the such inorganic/organic composite material of glass epoxide material and substitute ceramic medium material.
Below will be to using influence to describe as result of experiment by the inspection unit dielectric constant.In these experiments, prepare following material, as the material (thickness of all substrates all is 1mm) of the antenna substrate 2 of the dielectric antenna 1 of type shown in Figure 1.
Titanium dioxide ceramic:
(when 2.4GHz, unit dielectric constant: 21)
Aluminium oxide ceramics:
(when 2.4GHz, unit dielectric constant: 13)
Glass ceramics:
(when 2.4GHz, unit dielectric constant: 8)
The glass epoxide material:
(when 2.4GHz, unit dielectric constant: 4)
Various dielectric antennas are to use above-mentioned antenna substrate 2 to make, and with reference to Fig. 6 (a), (d) is set at 2mm the inflection width, and the opposed edge of cross line element 32 at interval (s) be set at line width (w) and equate, and the optimization total track length, to obtain the resonance frequency of 2.4GHz.These antenna all is connected with above-mentioned network analyzer, and the reflection coefficient (S11) when the 2.4GHz is measured.Fig. 9 shows the result.Will be understood that from experimental result shown in Figure 9 the unit dielectric constant of antenna substrate 2 is more little, reflection coefficient (S11) is just more little, thereby radio-wave radiation efficient improves just big more.When the unit dielectric constant is set to 13 or when following, can obtain-8dB allow antenna gain.
Refer again to Fig. 3 and Fig. 4, attention be that the optimum length (β p) of the extension feeder line length (β) of the feeder line 10e of extension is along with the line width (w) of the line width (Ws) of feeder line band 10 and antenna traces model 3 and change.In order to determine the optimum value of β p, can use a kind of known method, this method can provide simulation according to Theoretical Calculation.Yet, when definite each line width Ws or w, make substrate, on these substrates, extend β change of extension feeder line length or the variation of feeder line 10e.Then, each substrate all is connected with antenna, and uses above-mentioned known network analyzer that the reflection coefficient S11 when the target frequency is measured, can determine to make the extension feeder line length β of the value minimum of S11 like this, that is: can determine optimum length (β p).Have now found that, when the line width (Ws) of feeder line band 10 is 1.0～2.0mm, and the line width of antenna traces pattern 3 (w) is in the scope of 0.5～0.3mm the time, as exemplary value, can be adjusted into value in 2.4～7.5mm scope to extension feeder line length β the best of the feeder line 10e that extends.
Now a concrete example is probed into.Use a kind of aluminium oxide fired body (width: 3mm, length: 15mm, thickness: 1mm), as the dielectric material of the antenna substrate 2 that forms dielectric antenna 1 shown in Figure 1.With reference to Fig. 6 (a), smoke by the secondary of silk screen printing and Ag cream, form a kind of inflection width (d) and be the antenna traces pattern of 0.3mm for 0.3mm, opposed edge interval (s) for 2.4mm, line width (w).On the other hand, as shown in Figure 3 and Figure 4, preparing a kind of is that 50mm, width are that 25mm, thickness are the glass epoxy substrate of 1mm in commercially available length, as base plate for packaging 42.Forming width on a reverse first type surface of substrate 42 is that 25mm, length are the Cu system ground connection back side conductor layer 11 (thickness: 35 μ m) of 20mm, and on another first type surface, form feeder line band 10 (width: 1.4mm, thickness: 35 μ m), and have the extension feeder line 10e of various development length β.Except extending feeder line 10e, use above-mentioned network analyzer that the characteristic impedance Zo of the feeder line band 10 when the 2.4GHz is measured, thereby find that impedance is 50 Ω.
At next step, dielectric antenna is carried out surface encapsulation, that is: use scolder that dielectric antenna 1 is installed on the feeder line band 10 on the base plate for packaging with form shown in Figure 4, and use above-mentioned network analyzer that the reflection coefficient S11 when the 2.4GHz is measured.Fig. 7 shows the S11 value of mensuration like this, and this S11 value is to mark and draw according to the extension feeder line length β that extends feeder line 10e.To be understood that from Fig. 7 that S11 obviously than the little nearly β value of 10mm of the situation (β=0) when not forming extension feeder line 10e, like this, by the extension feeder line of appropriate length is set, can improve the radiation characteristic of radio wave.It will also be understood that it is minimum that S11 reaches, and this β value is corresponding with above-mentioned optimum length β p when β=5mm.In order to compare, when feeder line band 10 further stretches in boundary line BL (being represented by the negative value among Fig. 7) ground connection back side conductor layer 11 in addition, also to measure S11.Find that in this case as shown in Figure 7, S11 approaches 0, and is corresponding with total reflection, like this, the radiation of radio wave is considerably less.
Refer again to Fig. 6 (a), as mentioned above, antenna traces pattern 3 comprises a plurality of cross line elements 32, as shown in the figure, these cross line elements 32 extend in a certain direction, so that with the longitudinal axis of antenna 3 or line stretcher O intersects or intersect, and adopt side by side relationship to be arranged on the longitudinal direction of antenna.And shown in Fig. 6 (a), interconnect, and form solid line portion as a whole with complications or wavy shape in abutting connection with the end of cross line element 32.
Because antenna traces pattern 3 is a wavy shape, thereby can effectively shorten antenna total length L.As clearly visible among the figure, can't make inflection width (d) geometrically less than line width (w).Shown in Fig. 6 (b), therefore when shortening line width (w), can provide width less wavy shape.Even (d) is less for the inflection width, also can obtain remarkable result aspect the shortening antenna total length L.When the d/w value is set to 3 or when above, as in the primary condition aspect the predetermined shortening that realizes antenna length, preferably the absolute value of inflection width (d) is set at 3mm or following, this has nothing to do with line width (w).Like this,, also can control or suppress the deterioration of the radio-wave radiation characteristic of dielectric antenna effectively, and can provide size little and dielectric antenna that performance is high even adopt fluctuation or tortuous pattern.
Refer again to Fig. 4, and probe into more in detail to present embodiment, as mentioned above, the surface encapsulation pad 5 that forms at the back side of dielectric antenna 1 is connected with the end of extending feeder line 10e by weld part 9.Auxiliary pad 6 is connected with the supporting pad 15 of substrate-side by weld part 9.
As shown in Figure 4, antenna traces pattern 3 is arranged on the first type surface MP of antenna substrate 2 as a whole.When antenna substrate 2 adopts ceramic medium material to constitute, use and form antenna traces pattern 3, and this metal and ceramic medium material are smoked simultaneously, to form antenna traces model 3 such as the such refractory metal of platinum.In this case, because the circuit metal material of antenna traces pattern 3 must be expensive refractory metal, thereby its production cost probably can increase.
Compared with the above case, when adopting a kind of manufacture method, that is: antenna substrate 2 is fired, handle by antenna traces pattern 3 being carried out second metallization then, when on the first type surface MP of antenna substrate 2, forming this manufacture method of antenna traces pattern 3, can use the lower metal of fusing point economically, as the circuit metal material.More particularly, can use such as the lower metal cream of the such fusing point of Ag type cream and print pattern.This cream is applied to after smoking on the antenna substrate 2, and carries out secondary and smoke when a certain temperature, and this temperature is lower than the firing temperature of dielectric material, and when this temperature, carries out fully smoking of metal cream.Also can use electroless plating method or physical vacuum sedimentation to form circuit model.Concrete example comprises selected low electrical resistant material from following group, this group comprises: Ag type (the single material of Ag), Ag metal oxide (oxide of Mn, V, Bi, Al, Si or Cu), Ag glass adds (Ag-Pd, Ag-Pt, Ag-Rh etc.), and Cu type (the single material of Cu, Cu metal oxide, Cu-Pd, Cu-Pt, Cu-Rh etc.).What note is, also can use by polymer or smoke the protective dielectric layer (5～50 μ m are thick typically) that the type ceramic material forms such as the such low temperature of glass ceramics to cover the antenna traces pattern 3 that forms on the first type surface MP of antenna substrate 2.
As mentioned above, in the antenna traces pattern 3 shown in Fig. 6 (a), each cross line circuit component 32 all with the direction of antenna longitudinal extension direction quadrature, that is: form on the direction vertical with the longitudinal axis of antenna.Make in abutting connection with each interconnection line element 33 of cross line element 32 interconnection to form on the antenna longitudinal direction, that is: the longitudinal axis with antenna extends in parallel.On the antenna of antenna was vertical, the minimum possible value of the length of each cross line element 32 was line width (w).Therefore, major advantage is to shorten antenna length.Yet the form of antenna traces model of the present invention or formation are not limited to above-mentioned particular form.For example, can use the interconnection line element 33 that extends in parallel with the antenna longitudinal axis to make cross line element 32 interconnection of inclination, perhaps can adopt a kind of antenna traces pattern, in this antenna traces pattern, cross line element 32 engages by level and smooth interconnection, to form sinusoidal curve.This antenna traces pattern is being not so good as the pattern shown in Fig. 6 (a)～6 (c) aspect the shortening antenna length, but has the advantage that reduces the radio-wave radiation loss, because these models do not comprise the sharp bend portion shown in Fig. 6 (a)～6 (c).
The importance that shortens antenna length is carried out more detailed probing into, Figure 10 shows the line width (w) of dielectric antenna and the relation between the antenna length (L), wherein, the dielectric material that forms antenna substrate 2 is that aluminium oxide is smoked body (thickness: 1mm), and resonance frequency is set to 2.4GHz.In this case, fluctuation or inflection width (d) are 2mm, and the interval between the opposed edge of cross line element 32 (being defined as the distance between the opposed edge) is set to line width (w) and equates.To be understood that from Figure 10 that (w) is more little for the line width of antenna traces model 3, the effect aspect the shortening antenna length is just remarkable more.
When forming the existing unipole antenna of typical case on printed circuit board (PCB) in component package, for the necessary antenna length of resonance frequency that obtains 2.4GHz can reach 27mm.From Figure 10, will be appreciated that when using above-mentioned fluctuation circuit pattern,, antenna length can be shortened into the pact half (13.5mm) of unipole antenna length by using the line width of 0.3mm.Yet when line width (w) during less than 0.05mm, the increase of the inductive component of antenna pattern can make the antenna characteristics impedance increase.And being connected with the impedance that produces between the telecommunication circuit of antenna does not match and probably can make the radio-wave radiation decrease in efficiency.Therefore, line width w preferably is set to 0.05mm at least.
With reference to Figure 12 (a), also can adopt this formation according to dielectric antenna of the present invention, that is: antenna traces pattern 3 can be divided into the superimposed layer segmentation, represents with 3s, and each segmentation 3s is arranged in the different layers of the antenna substrate 2 that constitutes the stack body.Each superimposed layer segmentation 3s all is connected with contiguous segment by the conduction intermediary element of representing with 3v.In this constituted, shown in the dotted line among Figure 12 (b), the antenna meander line can be embedded in overlaying structure inside.In parameter (w), (s) and (d) with the similar size relationship of above-mentioned size relationship also applicable to this formation.Adopt this formation, can obtain antenna directivity, and do not depend on the first type surface of medium substrate specially.
In Fig. 6 (a) in abutting connection with (s) 0.1mm at least preferably at interval of the opposed edge between the cross line element 32, so that good radiation characteristic is provided.On the other hand, in order to realize the remarkable shortening of antenna length, the interval between the opposed edge preferably remains in the scope that is not more than twice line width (w).Refer again to Figure 12 (b), in this case, the interval between the opposed edge (s) is defined in the length of the center line O part at fluctuation range (d) center that the opposed edge by adjacency cross line element 32 blocks.
Although above antenna to different embodiment according to the subject invention is described and discusses, yet antenna of the present invention is not subject to these embodiment especially, but can carry out suitable change or modification in the case without departing from the scope of the present invention certainly.For example, although the wire portion 220 of the antenna traces pattern of antenna 1 has meander-shaped, yet this wire portion can have other shapes, for example, and spirality.And although wire portion 220 is shown as on the outer surface that is formed on medium substrate 2, yet wire portion 220 also can be formed on the inside and outside of medium substrate 2.
Claims (16)
1. high frequency wireless communication apparatus dielectric antenna, described antenna comprises:
Medium substrate;
Conduction meander line layer, it is formed on the medium substrate;
The electrically-conductive feed line layer, it is formed on the medium substrate, and the line width of described electrically-conductive feed line layer is greater than the line width of meander line layer; And
The conduction conial layer, it makes conduction meander line layer be connected with the electrically-conductive feed line layer, and described conduction conial layer has the edge, and this edge becomes angle γ inclination with the joining edge of electrically-conductive feed line layer, and this angle γ is towards conducting electricity the direction detection of meander line layer.
2. dielectric antenna according to claim 1,
Wherein said angle γ is that the edge by the edge of electrically-conductive feed line layer and conduction conial layer forms, and described angle γ is 110 °～175 ° angle.
3. dielectric antenna according to claim 1,
Wherein between the joining edge of the edge of conduction conial layer and conduction meander line layer, form inclined angle alpha, and described angle α is 5 °～70 ° angle.
4. dielectric antenna according to claim 1, wherein medium substrate has first dielectric constant, and wherein said antenna further comprises:
Another substrate;
The feeder line band, it is formed on the first surface of described another substrate; And
Ground plane, it is arranged on another counter surface of described another substrate;
Described electrically-conductive feed line layer is connected with the feeder line of extension, this extension feeder line extends from the described feeder line band that the described first surface at above-mentioned another medium substrate forms, the dielectric constant of described another substrate is less than described first dielectric constant, and the feeder line of described extension is from the position definite length extended β of grounding electrode termination, and separates by described another medium substrate.
5. dielectric antenna according to claim 4, wherein said predetermined length β is 2.4～7.5mm.
6. dielectric antenna according to claim 1, wherein said medium substrate comprise a part that forms the medium substrate of RF circuit module above it.
7. dielectric antenna according to claim 1, the width of the conduction meander line layer that wherein forms on medium substrate is 0.05～0.3mm.
8. dielectric antenna according to claim 1, wherein said electrically-conductive feed line layer has a width, and comprise a part, this part extends on the end surfaces of medium substrate, so that form line feed terminals thereon, by this line feed terminals emission or reception high frequency electrical signal, the width of described line feed terminals equates with the width of electrically-conductive feed line layer.
9. dielectric antenna according to claim 1, wherein said conduction meander line layer, described electrically-conductive feed line layer and described conduction conial layer comprise the copline part of shared layer.
10. dielectric antenna according to claim 1, wherein said medium substrate has first dielectric constant, and wherein said antenna also comprises:
Another substrate;
The feeder line band, it is formed on the first surface of described another substrate; And
The ground connection belt, it forms along the feeder line band on the first surface of described another medium substrate;
Described electrically-conductive feed line layer is connected with the feeder line of extension, this extension feeder line extends from the described feeder line band that the described first surface at described another medium substrate forms, described extension feeder line is from the position definite length extended 2.4～7.5mm of grounding electrode termination, and separates by described another medium substrate.
11. dielectric antenna according to claim 1, wherein the meander line layer has the longitudinal axis, and wherein the marginating compartment of measuring to the joining edge of adjacency meander line element from the edge of the first meander line element is greater than 0.1mm, and less than the twice of meander line element width; And with the direction of the longitudinal axis normal of meander line layer, the inflection width of measuring between the outside line edge of meander line layer is not more than 3mm.
12. dielectric antenna according to claim 1,
Wherein said angle γ is 130 °～165 ° angle.
13. dielectric antenna according to claim 1,
Wherein the inclined angle alpha that forms between the joining edge of the edge of conduction conial layer and conduction meander line layer is 16 °～49 °.
14. a high frequency wireless communication apparatus dielectric antenna, described antenna comprises:
Medium substrate;
Conduction meander line layer, it is formed on medium substrate inside, and has line width;
The electrically-conductive feed line layer, it is formed on medium substrate inside, and the line width of described electrically-conductive feed line layer is greater than the line width of meander line layer; And
The conduction conial layer, it is formed on medium substrate inside, and conduction meander line layer is connected with the electrically-conductive feed line layer, and the edge of this conduction conial layer becomes an angle lapping oblique in the direction towards conduction meander line layer with the joining edge of electrically-conductive feed line layer.
15. dielectric antenna according to claim 14, wherein said medium substrate are the parts of the medium substrate of top formation RF circuit module.
16. a high frequency wireless communication apparatus dielectric antenna, described antenna comprises:
First medium substrate, it has dielectric constant;
Conduction meander line layer, it is formed on first medium substrate, and has line width;
The electrically-conductive feed line layer, it is formed on first medium substrate, and the line width of this electrically-conductive feed line layer is greater than the line width of meander line layer;
Second medium substrate, its dielectric constant is less than the dielectric constant of first medium substrate;
The electrically-conductive feed line band, it is formed on the surface of second medium substrate;
Ground plane, it is formed on another counter surface of described second medium substrate; And
Extend feeder line, its described feeder line band that forms from the described surface at described second medium substrate extends, this extends the position definite length extended β of feeder line from described grounding electrode termination, and separates with described second medium substrate, and described predetermined length β is 2.5～7.5mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002056904 | 2002-03-04 | ||
| JP56904/2002 | 2002-03-04 |
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| Publication Number | Publication Date |
|---|---|
| CN1442930A true CN1442930A (en) | 2003-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03105115 Pending CN1442930A (en) | 2002-03-04 | 2003-03-04 | Medium antenna of high frequency radio communication equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820100B (en) * | 2005-02-01 | 2011-07-27 | 富士通株式会社 | A meander line antenna |
| CN102931490A (en) * | 2012-10-31 | 2013-02-13 | 大连海事大学 | Axial-mode cylindrical helical antenna |
| CN103380541A (en) * | 2011-02-18 | 2013-10-30 | 西门子公司 | A meander line antenna |
-
2003
- 2003-03-04 CN CN 03105115 patent/CN1442930A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820100B (en) * | 2005-02-01 | 2011-07-27 | 富士通株式会社 | A meander line antenna |
| CN103380541A (en) * | 2011-02-18 | 2013-10-30 | 西门子公司 | A meander line antenna |
| CN102931490A (en) * | 2012-10-31 | 2013-02-13 | 大连海事大学 | Axial-mode cylindrical helical antenna |
| CN102931490B (en) * | 2012-10-31 | 2014-11-05 | 大连海事大学 | Axial-mode cylindrical helical antenna |
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