CN1276544C - Antenna device - Google Patents
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- CN1276544C CN1276544C CN 02103563 CN02103563A CN1276544C CN 1276544 C CN1276544 C CN 1276544C CN 02103563 CN02103563 CN 02103563 CN 02103563 A CN02103563 A CN 02103563A CN 1276544 C CN1276544 C CN 1276544C
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Abstract
An antenna apparatus comprises a substrate, a chip antenna mounted on the substrate, and a ground pattern disposed on the substrate, at least a portion on the side of a power supply terminal of an antenna conductor in the chip antenna being overlapped with the ground pattern.
Description
Technical field
The present invention relates to the antenna assembly that in the small communication devices of mobile phone etc., uses.
Background technology
In order to realize the miniaturization of mobile phone etc., people know the chip aerial of surface installing type are installed to antenna assembly on the printed circuit board (PCB).In order to make the communication equipment miniaturization, must make chip aerial miniaturization as much as possible.But, exist the problem that narrows down when the bandwidth that makes chip aerial miniaturization aft antenna.
Summary of the invention
The object of the present invention is to provide antenna assembly small-sized and that bandwidth is wideer.
Antenna assembly of the present invention is characterised in that to possess: substrate; Be installed to the chip aerial that possesses antenna conductor on the aforesaid substrate; Be formed on the ground wire figure on the part of aforesaid substrate; To the power supply terminal of above-mentioned chip aerial power supply, be configured so that wherein the part of the part of above-mentioned power supply terminal side of above-mentioned power supply terminal and above-mentioned antenna conductor and above-mentioned ground wire figure is overlapping.
If make to become such formation, then the size of substrate can reduce the chip aerial so big amount in ground wire figure one side of submerging, and also makes the coupling that is easy to obtain chip aerial and supply lines simultaneously.
Description of drawings
Figure 1A and Figure 1B show the antenna assembly of embodiments of the invention 1, and Figure 1A is a front view, and Figure 1B is an end view.
Fig. 2 A and Fig. 2 B show in the antenna assembly of Figure 1A and Figure 1B, and the width of dielectric piece is made to become the also narrow example of meander width than meander shape (meander) antenna conductor, and Fig. 2 A is a front view, and Fig. 2 B is an end view.
The curve chart of Fig. 3 shows in Fig. 2 A and Fig. 2 B, the variation of the VSWR when the overlapping dimension B of antenna conductor and ground wire figure is changed.
The curve chart of Fig. 4 shows in Fig. 2 A and Fig. 2 B, the variation of the bandwidth when the overlapping dimension B of antenna conductor and ground wire figure is changed.
Fig. 5 A and Fig. 5 B show an example of existing antenna assembly, and Fig. 5 A is a front view, and Fig. 5 B is an end view.
Fig. 6 A and Fig. 6 B show an example of the antenna assembly of embodiments of the invention 2, and Fig. 6 A is a front view, and Fig. 6 B is an end view.
The curve chart of Fig. 7 shows in the antenna assembly of Fig. 6 A and Fig. 6 B, the variation of the VSWR when the overlapping dimension B of antenna conductor and ground wire figure is changed.
The curve chart of Fig. 8 shows in the antenna assembly of Fig. 6 A and Fig. 6 B, the variation of the bandwidth when the overlapping dimension B of antenna conductor and ground wire figure is changed.
Fig. 9 A and Fig. 9 B show an example of the antenna assembly of embodiments of the invention 3, and Fig. 9 A is a front view, and Fig. 9 B is an end view.
The curve chart of Figure 10 shows in the antenna assembly of Fig. 9 A and Fig. 9 B, the variation of the VSWR when the overlapping dimension B of antenna conductor and ground wire figure is changed.
The curve chart of Figure 11 shows in the antenna assembly of Fig. 9 A and Fig. 9 B, the variation of the bandwidth when the overlapping dimension B of antenna conductor and ground wire figure is changed.
Figure 12 A and Figure 12 B show an example of the antenna assembly of embodiments of the invention 4, and Figure 12 A is a front view, and Figure 12 B is an end view.
Figure 13 A and Figure 13 B show an example of the antenna assembly of embodiments of the invention 5, and Figure 13 A is a front view, and Figure 13 B is an end view.
Figure 14 A and Figure 14 B show the chip aerial of the antenna assembly of embodiments of the invention 6, and Figure 14 A is the perspective oblique view, and Figure 14 B is a profile.
Figure 15 A and Figure 15 B show the state of test sheet antenna performance, and Figure 15 A is a front view, and Figure 15 B is an end view.
Figure 16 A and Figure 16 B show the chip aerial of the antenna assembly of embodiments of the invention 7, and Figure 16 A is the perspective oblique view, and Figure 16 B is a profile.
The front view of Figure 17 A and Figure 17 B shows the antenna assembly of embodiments of the invention 8.
The curve chart of Figure 18 shows the pad width of antenna assembly of Figure 17 A and Figure 17 B and the relation of bandwidth.
The curve chart of Figure 19 shows the pad width of antenna assembly of Figure 17 A and Figure 17 B and the relation of resonance frequency.
The curve chart of Figure 20 shows the pad width of antenna assembly of Figure 17 A and Figure 17 B and the relation of VSWR.
Figure 21 A and Figure 21 B show the chip aerial of the antenna assembly that uses in Figure 17 A and Figure 17 B, Figure 21 A is the perspective oblique view, and Figure 21 B is a profile.
Figure 22 A～Figure 22 C shows the variation of the chip aerial that uses in the antenna assembly of embodiments of the invention 8, Figure 22 A is a top view, and Figure 22 B is a front view, and Figure 22 C is a bottom view.
Embodiment
Below, explain embodiments of the invention referring to accompanying drawing.
Figure 1A and Figure 1B show the antenna assembly of embodiments of the invention 1, and Figure 1A is a front view, and Figure 1B is an end view.
The antenna assembly of embodiment 1 on the printed circuit board (PCB) 10 that has ground wire figure 18 on the single side surface of insulated substrate 16, is equipped with single side surface or inner chip aerial with meander shape antenna conductor 22 at dielectric piece 20.In embodiment 1, meander shape antenna conductor 22 possesses close part 22a of meander pitch and the thin part 22b of meander pitch.The close part 22a of meander pitch forms in power supply terminal 26 1 sides, and one side forms the part 22b that the meander pitch is dredged on the top.In addition, the part 22b that part 22a that the meander pitch is close and meander pitch are dredged forms feasible meander respectively and repeatedly repeats.Have again, in embodiment 1, chip aerial 12 is installed to be and makes part or all of part 22a that the meander pitch is close overlapping with ground wire figure 18, and the part of more past top one side that compares (being the part 22b that the meander pitch is dredged at least) is installed to be and feasiblely gives prominence to away from the top of ground wire figure 18.
In formation as described above, adopt chip aerial 12 is overlapped onto the way that the size B on the ground wire figure 18 adjusts, just can easily obtain the coupling between chip aerial 12 and the coaxial supply lines 14, just can reduce VSWR (voltage standing wave ratio).In existing formation,, must when being designed to make that VSWR descends, then will produce the problem that bandwidth narrows down to the shape or the power supply terminal more following time such as position partly of antenna conductor for reducing VSWR.
The antenna assembly of Fig. 2 A and Fig. 2 B is an antenna assembly of having realized the miniaturization of chip aerial in the antenna assembly of Figure 1A and Figure 1B.Being constructed as follows of chip aerial.Make the width of dielectric piece 20 form to such an extent that the meander width of ratio antenna conductor 22 is also narrow, the mid portion of the meander Width of antenna conductor 22 is embedded in the dielectric piece 20, make the surface curvature of two side portions along dielectric piece 21.
Fig. 3 is a measurement result of measuring the relation of overlapping dimension B in the sort of antenna assembly shown in Fig. 2 A and Fig. 2 B and VSWR, and Fig. 4 measures the overlapping dimension B in the sort of antenna assembly shown in Fig. 2 A and Fig. 2 B and the measurement result of bandwidth relationship.Employed printed circuit board (PCB) 10 is of a size of wide 33mm * long 150mm (size of insulated substrate 16), ground wire figure 18 is of a size of wide 33mm * long 120mm, anchor pad 32 is of a size of wide 2mm * long 1mm, the profile of chip aerial 12 is wide 4.2mm * long 16mm * thick 1.1mm, between the close part 22a line of the meander pitch of meander shape antenna conductor 22/live width is 150/150 μ m totally 27 circles, between the part 22b line that the meander pitch is dredged/live width is 200/200 μ m totally 17 circles.The meander width of the meander shape antenna conductor before crooked is 8.7mm.In Fig. 3 and Fig. 4, overlapping dimension B is the state that chip aerial is separated from ground wire figure 18 shown in Fig. 5 A and Fig. 5 B for bearing, and is that canonical is the state that ground wire figure 18 and chip aerial are piled up shown in Fig. 2 A and Fig. 2 B.Mensuration is carried out after coaxial supply lines 14 is connected to network antenna.Resonance frequency is 1033MHz when B=3mm.
By Fig. 3 and Fig. 4 as can be known,, then can adopt the way of the installation site (size B) of adjusting chip aerial 12, adjust VSWR if adopt the installation constitution of embodiment 1.Therefore, the adjustment of VSWR is easy, in addition, makes VSWR low, then can obtain the effect that bandwidth broadens.In other words, have and be easy to the advantage that obtains mating.In the past, then bandwidth will narrow down when reducing VSWR, if adopt embodiment 1, then the result just becomes to improving this point significantly.Under the situation of embodiment 1, owing to made the close part 22a one of meander pitch stress to be laminated on the ground wire figure 18, so above-mentioned particular significant effect.In addition, owing to can make the size A in the needed zone of fixing up an aerial wire of printed circuit board (PCB) 10 (in other words, not having the zone of ground wire figure 18) form also forr a short time, so be effective to the miniaturization of communication equipment than existing zone.
In addition, adopt the way on the pad 32 that is welded to ground wire figure 18 at the anchor pad part 30A, the 30B that form on the bottom surface of dielectric piece 20 and forms in the position of opening, chip aerial 12 is installed on the printed circuit board (PCB) 10 from the edge separation of ground wire figure 18.Here, highlight, then can also reduce the size A in the zone that does not have ground wire figure 18 of printed circuit board (PCB) 10 if in advance above-mentioned pad 32 is formed the top that makes not from chip aerial 12.
Fig. 6 A and Fig. 6 B show the antenna assembly of embodiments of the invention 2.In Fig. 6 A and Fig. 6 B,, give same label and omit detailed explanation for those identical parts of antenna assembly with Fig. 2 A and Fig. 2 B.
The antenna assembly of embodiment 2 forms constant pitch to the meander pitch of the antenna conductor 22 in the such antenna assembly of Fig. 2 A and Fig. 2 B.
Fig. 7 is the measurement result that is determined at the relation of overlapping dimension B in the antenna assembly of Fig. 6 A and Fig. 6 B and VSWR.In addition, Fig. 8 is the measurement result that is determined at the relation of overlapping dimension B in the antenna assembly of Fig. 6 A and Fig. 6 B and bandwidth.In embodiment 2, employed printed circuit board (PCB) 10 is of a size of wide 33mm * long 150mm (size of insulated substrate 16), ground wire figure 18 is of a size of wide 33mm * long 120mm, anchor pad 32 is of a size of wide 2mm * long 1mm, the profile of chip aerial 12 is wide 4.3mm * long 16.0mm * thick 1.2mm, between the meander pitch lines of meander shape antenna conductor 22/and live width is 200/180 μ m totally 37 circles.The meander width of the meander shape antenna conductor 22 before crooked is 8.9mm.Resonance frequency is 952MHz when B=3mm.
According to Fig. 7 and Fig. 8 as can be known, similarly to Example 1, the adjustment of VSWR is easy, in addition, has the effect that bandwidth broadens when VSWR is low.
Embodiment 3
Fig. 9 A and Fig. 9 B show the antenna assembly of embodiments of the invention 3, in Fig. 9 A and Fig. 9 B, for those identical parts of antenna assembly with Fig. 2 A and Fig. 2 B, give same label and omit detailed explanation.
The antenna assembly of embodiment 3 increases to wide 4mm * long 3mm to the size of the anchor pad 32 in the antenna assembly of Fig. 6 A and Fig. 6 B.In addition, the antenna assembly of embodiment 3 makes anchor pad 32 than the outstanding number mm in the top of chip aerial 12 (for example, 2mm) forward.
Figure 10 is the measurement result that is determined at the relation of overlapping dimension B in the antenna assembly of Fig. 9 A and Fig. 9 B and VSWR.In addition, Figure 11 is the measurement result that is determined at the relation of overlapping dimension B in the antenna assembly of Fig. 9 A and Fig. 9 B and bandwidth.Resonance frequency is 874MHz when B=3mm.
According to Figure 10 and Figure 11 as can be known, similarly to Example 1, the adjustment of VSWR is easy, in addition, has the effect that bandwidth broadens when VSWR is low.
Figure 12 A and Figure 12 B show the antenna assembly of embodiments of the invention 4, in Figure 12 A and Figure 12 B, for those parts identical with the antenna assembly of Figure 1A and Figure 1B, give same label and omit detailed explanation.
Being constructed as follows of the antenna assembly of embodiment 4.On printed circuit board (PCB) 10, form stripline runs 34 as supply lines.In addition, a side forms power supply terminal 26 below the dielectric piece 20 of chip aerial 12.Then, by means of the welding etc. the power supply terminal 26 of chip aerial 12 is connected on the above-mentioned stripline runs 34.In the antenna assembly of embodiment 4, also can obtain effect similarly to Example 1.
Figure 13 A and Figure 13 B show the antenna assembly of embodiments of the invention 5, in Figure 13 A and Figure 13 B, for those parts identical with the antenna assembly of Figure 1A and Figure 1B, give same label and omit detailed explanation.
Under the situation of the antenna assembly of embodiment 5, on the face of a side of the installation chip aerial 12 of insulated substrate 16, form the stripline runs 34 of power supply usefulness, ground wire figure 18 is set on the face of an opposite side.
From embodiment 1 to embodiment 5, explanation be that the meander pitch of the meander shape antenna conductor of chip aerial is done to become the situation of homogeneous and to form closely in power supply terminal one side, the situation that one side forms thinly on the top.Be not limited thereto, chip aerial also can form the meander pitch of meander shape antenna conductor thinly in power supply terminal one side, and one side forms closely on the top.
In addition, from embodiment 1 to embodiment 5, though the explanation be chip aerial antenna conductor for the meander shape situation,, be under the spiral helicine situation at the antenna conductor of chip aerial, the present invention can be suitable for too.
If adopt embodiment 1 to embodiment 5, then can be so that the antenna conductor of its power supply terminal one side and ground wire figure carry out overlappingly like that chip aerial being installed on the substrate.By means of this, can reduce the size in the zone that does not have ground wire figure of substrate.Therefore, can realize the miniaturization of communication equipment.The design of antenna, manufacturing in addition,, can obtain the coupling of chip aerial and supply lines, so will become easily by means of the way that its overlapping dimension is adjusted if owing to make the power supply terminal one of chip aerial stress to be laminated on the ground wire figure.
Figure 14 A and Figure 14 B show the antenna assembly of embodiments of the invention 6, in Figure 14 A and Figure 14 B, for those parts identical with the antenna assembly of Figure 1A and Figure 1B, give same label and omit detailed explanation.
The chip aerial 12 of embodiment 6, the shape of its meander shape antenna conductor 22 is same with embodiment 1 substantially, but the meander shape antenna conductor 22 that plane formula ground is formed is embedded in the dielectric piece 20.Meander shape antenna conductor 22 is advanced with meandering shape in one direction.The part 22b that this antenna conductor 22 has the close part 22a of meander pitch and dredges.The close part 22a of meander pitch is set at power supply terminal 26 1 sides of antenna conductor 22.On the other hand, the thin part 22b of meander pitch then is set at top one side.Part 22a that the meander pitch is close and the part 22b that dredges form meander respectively and make a plurality of pitches carry out repetition.In addition, with close by comparison this side of part 22a of part 22b that the meander pitch is dredged, the number of turn (the so-called here number of turn is equivalent to 2 times of pitch number) forms manyly.Power supply terminal 26 is projected into the outside of dielectric piece 20 and comes, and the head portion of antenna conductor 22 constitutes fixed terminal 27 along the outer surface bending of dielectric piece 20.Power supply terminal 26 also can form the shape same with power supply terminal 27.If it is also wide that the conductor live width of the part 22b that the meander pitch is dredged forms the conductor live width of part 22a of De Bimi in advance, then can realize wideer broadband.
In the example of Figure 14 A and Figure 14 B, power supply terminal 26 is arranged on close part 22a one side of meander pitch, power supply terminal 27 is arranged on thin part 22b one side.Also can be arranged on part 22b one side that the meander pitch is dredged to power supply terminal in contrast, fixed terminal is arranged on close part 22a one side.But, as the back will be said, the formation of Figure 14 A and Figure 14 B this can be to reduce resonance frequency.
Figure 15 A and Figure 15 B show chip aerial 12 as described above are loaded on the circuit substrate 10, carry out the state of the performance test of antenna.Circuit substrate 10 has ground wire figure 18 like that at the remaining a part of size A of single face one side of insulated substrate 16.Chip aerial 12 is loaded as and makes power supply terminal 26 1 side parts are overlapped onto on the ground wire figure 18, and the center conductor 24 of coaxial supply lines 14 is connected on the power supply terminal 26.28 of the external conductors of coaxial supply lines 14 are fixed on the ground wire figure 18 with welding portion 36.The power supply terminal 27 of the head portion of chip aerial 12 is welded on the pad 32 that forms on the zone that does not have ground wire figure 18 of insulated substrate 16.
Chip aerial of the present invention for test, shown in Figure 14 A and Figure 14 B, have in meander pitch close part one side the chip aerial (embodiment 1) of power supply terminal and in contrast is set, part one side of dredging in the meander pitch is provided with so 2 kinds of the chip aerials (embodiment 2) of power supply terminal.Shown in the sizes of each chip aerial and its circuit substrate of loading etc. are following.
The meander width of meander shape antenna conductor 22: 7.2mm
The thickness of meander shape antenna conductor 22: 100 microns
The close part 22a of meander pitch: between live width/line=150/150 micron, 25 circles
The part 22b that the meander pitch is dredged: between live width/line=200/200 micron, 17 circles
The length and width of dielectric piece 20, thick: 15 * 8 * 0.6mm
The dielectric coefficient of dielectric piece 20: 3.4
The length of ground wire figure 18 and wide: 120 * 33mm
The length of the lap of ground wire figure 18 and chip aerial 12: 2mm
For comparing, remove a meander pitch done to become outside constant (between live width/line=170.6/170.6 micron, 42 circles), manufactured experimently chip aerial same as described above (comparative example 1), it similarly be loaded into above-mentioned same substrate on, carry out same test.It the results are shown in table 1.
Table 1
| Bandwidth (MHz) (VSWR=2) | Centre frequency (MHz) | Relative bandwidth (%) | |
| Embodiment 1 a close side is powered | 96 | 849 | 11.3 |
| The side power supply that | 141 | 930 | 15.2 |
| The branch of comparative example 1 no density | 81 | 854 | 9.4 |
According to table 1, as can be known: be provided with the antenna (embodiment 1) of part that the meander pitch dredges and close part, the antenna (comparative example 1) constant compared with the meander pitch comes, and bandwidth can form widely.In addition, also as can be known: the situation of powering from a side and a side of dredging of the close side power supply of the pitch of meandering compares, and centre frequency can form lowly.Keep following invariable of state meander pitch form close antenna (comparative example 1) with miniaturization, although centre frequency can form lowly, exist the difficult problem that bandwidth and relative bandwidth narrow down.
Embodiment 7
Figure 16 A and Figure 16 B show the antenna assembly of embodiments of the invention 7, in Figure 16 A and Figure 16 B, for those identical parts of antenna assembly with Figure 14 A and Figure 14 B, give same label and omit detailed explanation.
Being constructed as follows of the chip aerial 12 of embodiment 7.The mid portion of the meander Width of meander shape antenna conductor 22 is embedded in the dielectric piece 20.Then turn back overlappingly along the outer peripheral face and the above-mentioned mid portion of dielectric piece 20 in the both ends of meander Width, form meander shape antenna conductor 22 three-dimensionally.So just can reduce the width dimensions of chip aerial 12.On a side's who turns back at the meander Width both ends of the meander shape antenna conductor 22 of dielectric piece 20 the face, be provided with resin-coated 21.
In embodiment 7, the part 22b this point that meander shape antenna conductor 22 has the close part 22a of meander pitch and dredges, form to such an extent that many this point with close this side of part 22a than the meander pitch number of the part 22b that dredges, and the method to set up of power supply terminal 26 and power supply terminal 27 etc. is the same with embodiment 6.
Secondly, the performance of the chip aerial that constitutes as Figure 16 A and Figure 16 B is studied.For the chip aerial of the present invention of test, have in meander pitch close part one side the chip aerial (embodiment 3) of power supply terminal and in contrast is set, part one side of dredging in the meander pitch is provided with so 2 kinds of the chip aerials (embodiment 4) of power supply terminal.The size of two antennas is as follows.The meander Width both ends that make meander shape antenna conductor are that the part of width l=1.4mm is turned back, and the antenna shapes size is made to become 16 * 4.4 * 1.2mm.Remove the dielectric coefficient of dielectric piece is done to become beyond 20, with embodiment the 1, the 2nd, the same.The size of circuit substrate also is identical.
For comparing, use the meander shape antenna conductor identical with comparative example 1, manufactured experimently the chip aerial (comparative example 2) that is turned back in the Width both ends of meandering with embodiment 3,4, this has also been carried out same test.It the results are shown in table 2.
Table 2
| Bandwidth (MHz) (VSWR=2) | Centre frequency (MHz) | Relative bandwidth (%) | |
| Embodiment 3 close sides are powered | 94 | 997 | 9.5 |
| The side power supply that | 84 | 1036 | 8.1 |
| The branch of comparative example 2 no densitys | 81 | 1043 | 7.8 |
This result has also shown the tendency same with the result of table 1.In addition, as can be known from the results of Table 2, as Figure 16 A and Figure 16 B under the situation of the end of the Width antenna of turning back, come side's relative bandwidth of close side power supply wide compared with the side power supply of dredging.And centre frequency also is that a side of close side power supply is low.By this result as can be known: when in crooked density meander, carrying out close side power supply, just can realize further ' miniaturization ' and ' broadband ' simultaneously.
Though explanation is the chip aerial with meander shape antenna conductor in embodiment 6 and embodiment 7,, the present invention can use similarly for the chip aerial with helical antenna.
Figure 17 A and Figure 17 B show the antenna assembly of embodiments of the invention 8, in Figure 17 A and Figure 17 B, for those parts identical with the antenna assembly of Figure 1A and Figure 1B, give same label and omit detailed explanation.
The antenna assembly of embodiment 8 is installed in chip aerial 12 on the single side surface of insulated substrate 16 and has on the printed circuit board (PCB) 10 of ground wire figure 18.Printed circuit board (PCB) 10 has the rectangular pads 32 that antenna loads usefulness from leaving on the position come with the edge of the ground wire figure 18 of the face of the ground wire figure 18 opposite sides of insulated substrate 16 tops.Chip aerial 12 is installed to be and makes its head portion be positioned at pad 32 tops, and its cardinal extremity part (power supply terminal one side) is overlapping with ground wire figure 18.Also can not use coaxial supply lines 14 and replace the stripline runs that use forms on printed circuit board (PCB) 10.Chip aerial 12 as shown in figure 21, is arranged on meander shape antenna conductor 22 inside of dielectric piece 20.Meander shape antenna conductor 22, the two end portions that is bent into feasible meander Width is carried out overlapping (promptly be bent into and make that the two ends of meander Width are close) in the pars intermedia office.In addition, meander shape antenna conductor 22 is formed and makes in power supply terminal 26 1 sides meander pitch closely, and one side forms thinly on the top.Part 22a that the meander pitch of meander shape antenna conductor 22 is close and the part 22b that dredges are formed respectively and make a plurality of pitches of meander repeat.Power supply terminal 26 is the parts that connect the center conductor 24 of coaxial supply lines 14.In addition,, on the position of the dorsal part that is equivalent to power supply terminal 26, form the 1st power supply terminal 27, on the position of the dorsal part on the top of the shape antenna conductor 22 that is equivalent to meander, form the 2nd fixed terminal 40 at the back side of dielectric piece 20.The 2nd fixed terminal 40 conducts with meander shape antenna conductor 22 by the conductor 22c around the end face of dielectric piece 20.In addition, on the side's at the both ends of the meander Width that loads meander shape antenna conductor 22 face, be provided with resin-coated 21.The chip aerial 12 of Xing Chenging like this is installed to be the 1st fixed terminal 27 is positioned on the pad 41, and the 2nd fixed terminal 40 is positioned on the pad 32, makes that part or all and the ground wire figure of part 22a that the meander pitch is close are overlapping.Install with common surface installing type parts and similarly carry out.If make that part 22a that the meander pitch of meander shape antenna conductor 22 is close and ground wire figure 18 carry out overlappingly installing like that,, just can easily obtain the coupling of chip aerial 12 and coaxial supply lines 14 then by means of its overlapping dimension is adjusted.
The antenna assembly of trial-production Figure 17 is tested its performance, learns that bandwidth produces big variation owing to the size of the pad 32 that forms on printed circuit board (PCB) 10.So the width W and the length L that change pad 32 have been carried out various tests.Figure 18 shows its result to Figure 20.Employed chip aerial 12, shown in Figure 21 A and Figure 21 B, the two end portions of the meander Width of meander shape antenna conductor 22 is bent to the mid portion top, and the meander pitch is close in power supply terminal 26 1 sides, than more past top one side then become and dredge.The meander width (width dimensions of deployed condition) of meander shape antenna conductor 22 is 8.7mm, the length of meander direct of travel is 15mm, the close part 22a conductor width/conductor separation of meander pitch is 150/150 μ m totally 27 circles, part 22b conductor width/conductor separation that the meander pitch is dredged is 200/200 μ m totally 17 circles, and the meander Width after the bending of both ends is of a size of 4mm.The thickness of dielectric piece 20 is 1mm, and dielectric coefficient is 20.Chip aerial 12 will be installed as and make power supply terminal 26 1 sides and the only overlapping 3mm of ground wire figure 18 of meander shape antenna conductor 22, top one side then with the only overlapping 3mm of pad 32.
Figure 18 shows the result that the variation of the bandwidth under the situation of width W that changes pad and length L is measured.According to this figure as can be known, if the pad width W then can obtain wide bandwidth below 2 times (8mm) of the meander Width size (4mm) of meander shape antenna conductor 22.In addition, also learn: when pad is wide increase compare also big the time, bandwidth can reduce greatly.Therefore, the pad width W must be set at below 2 times of meander Width size at meander shape antenna conductor.
For guaranteeing wideer bandwidth, it is desirable to pad width W work is become below 1.75 times of meander Width size of meander shape antenna conductor, even more ideal is to do to become below 1.5 times.In addition, even if the pad width W bandwidth that narrows down also can not narrowed down.But during stable when chip aerial consider to be installed, the pad width W it is desirable to do to become more than 0.5 times of meander Width size of meander shape antenna conductor, and even more ideal is to do to become more than 1 times.Figure 19 is a measurement result of measuring the resonance frequency under the situation that changes pad width W and length L.According to this figure as can be known, if form the pad width greatly then can reduce resonance frequency.This is because then can bring into play cause with extended antenna conductor length same effect when adding the large bonding pad width.
Figure 20 is a measurement result of measuring the VSWR under the situation that changes pad width W and length L.By this result also as can be known, it is following that as long as pad width do becomes 2 times (8mm) of meander Width size of meander shape antenna conductor.
In embodiment 8, chip aerial also can be that Figure 22 A is to the sort of shape shown in Fig. 2 C similarly to Example 1.This chip aerial 12 is arranged on the meander shape antenna conductor 22 of flatness on the surface (or inner) of the dielectric piece 20 of high-dielectric coefficient.Meander shape antenna conductor 22 is formed and makes in power supply terminal 26 1 sides meander pitch closely, and one side forms thinly on the top.Part 22a that the meander pitch of meander shape antenna conductor 22 is close and the part 22b that dredges are formed respectively and make a plurality of pitches of meander repeat.Power supply terminal 26 is the parts that connect the center conductor 24 of coaxial supply lines 14.In addition,, on the position of the dorsal part that is equivalent to power supply terminal 26, form the 1st power supply terminal 27, on the position of the dorsal part on the top of the shape antenna conductor 22 that is equivalent to meander, form the 2nd fixed terminal 40 at the back side of dielectric piece 20.The 2nd fixed terminal 40 conducts with meander shape antenna conductor 22 by the conductor 22c around the end face of dielectric piece 20.In addition, on the side's at the both ends of the meander Width that loads meander shape antenna conductor 22 face, be provided with resin-coated 21.The chip aerial 12 of Xing Chenging like this is installed to be and makes the 1st fixed terminal 27 be positioned at pad 41 tops, makes the 2nd fixed terminal 40 be positioned at pad 32 tops, makes that part or all and the ground wire figure of part 22a that the meander pitch is close are overlapping.Install with common surface installing type parts and similarly carry out.If make that part 22a that the meander pitch of meander shape antenna conductor 22 is close and ground wire figure 18 carry out overlappingly installing like that,, just can easily obtain the coupling of chip aerial 12 and coaxial supply lines 14 then by means of its overlapping dimension is adjusted.
Manufacture experimently antenna assembly as described above, its performance is tested, obtained tendency similarly to Example 8.
In embodiment 8, though explanation is that the shape of pad work is become rectangle, the shape of pad also can be other a shape and be not limited to rectangle.
If adopt above-mentioned each embodiment, then can obtain chip aerial small-sized and that bandwidth is wide.
In addition, adopt the fixing pad width of top one side of chip aerial is made to become the way below 2 times of meander width of shape antenna conductor of meandering, just can realize the broadband of chip aerial.Adopt again the top one side mounting of chip aerial is fixed to the way that is used for realizing on the broadband pad, can also make the further miniaturization of chip aerial, reduce to realize the miniaturization of substrate than the edge of the ground wire figure of the substrate size in (zone that does not have ground wire figure) more forward.
Can derive following invention from each above-mentioned embodiment.Antenna assembly of the present invention is characterised in that: possess substrate, be installed to the chip aerial on the aforesaid substrate and carry out the overlapping ground wire figure that is installed to the substrate top like that with at least a portion of power supply terminal one side of the antenna conductor of above-mentioned chip aerial.If adopt this antenna assembly, then the size of substrate can reduce chip aerial and ground wire figure carries out overlapping so big amount, also makes the coupling that is easy to obtain chip aerial and supply lines simultaneously.
As chip aerial, can use (1) surface or inner chip aerial that is provided with meander shape antenna conductor, or (2) are provided with the chip aerial of helical antenna conductor etc. at dielectric piece.The meander of antenna conductor or (and/or) pitch of spiral can be homogeneous, also can be that thin part and close part are arranged.
In addition, it is desirable to: above-mentioned antenna conductor, be meander shape or helical form, perhaps above-mentioned chip aerial has meander shape antenna conductor, above-mentioned meander shape antenna conductor possesses the part that the close part of meander pitch and meander pitch are dredged, and will be installed as on aforesaid substrate and make that part or all and ground wire figure of part that the meander pitch is close are overlapping.In addition, antenna conductor at chip aerial is under the spiral helicine situation, it is desirable to: the screw pitch of antenna conductor forms closely in power supply terminal one side, one side forms thinly on the top, and will be installed as on substrate and make that part or all and ground wire figure of part that the screw pitch of this helical antenna conductor is close are overlapping.
If make to become such formation, then purpose can become more easily for the adjustment that obtains coupling.
In above-mentioned each antenna assembly, also possess on the aforesaid substrate of being arranged on, the head portion of chip aerial is fixed to the locational pad that leaves from the edge of above-mentioned ground wire figure, above-mentioned pad being formed the top that makes not from above-mentioned chip aerial highlight, is desirable making aspect the further miniaturization of substrate.
Another antenna assembly of the present invention is characterised in that: possess antenna conductor and be meander shape or helical form, above-mentioned antenna conductor has the close part of meander pitch or screw pitch and the chip aerial of the part of dredging.By means of this, make antenna miniaturization and broadband be able to two upright.
In said antenna device, meander pitch or the close part of screw pitch are set at power supply terminal one side of above-mentioned antenna conductor, the part of dredging is set at top one side of above-mentioned antenna conductor, or the number of turn of the turn ratio of the close part of meander pitch or the screw pitch way of dredging is many, is realizing that further is desirable aspect broadband.
In addition, in above-mentioned each antenna assembly, also possess to be configured in and leave the locational antenna that comes from the edge of the ground wire figure of aforesaid substrate top the pad of usefulness is installed, above-mentioned chip aerial is installed to be and makes and to be provided with a side one side of power supply terminal towards ground wire figure one side, make the opposing party's one side and above-mentioned pad overlapping, the width of above-mentioned pad becomes below 2 times of meander Width size for meander shape antenna conductor, perhaps the pad width becomes to 0.5 to 1.75 times of the meander Width size of meander shape antenna conductor, is realizing that aspect the further miniaturization be desirable.
Another antenna assembly of the present invention is characterised in that: have on the single face of insulated substrate on the substrate of ground wire figure, chip aerial with meander shape antenna conductor is installed in the surface or the inner antenna assembly that constitutes of dielectric piece, aforesaid substrate leaves the position of coming at the edge from the ground wire figure of insulated substrate top and has the pad that antenna is installed usefulness, above-mentioned chip aerial is installed to be and makes and to be provided with a side one side of power supply terminal towards ground wire figure one side, make the opposing party's one side and above-mentioned pad overlapping, the width of above-mentioned pad becomes below 2 times of meander Width size for meander shape antenna conductor.By means of this, can realize the miniaturization of substrate.In addition, adopt the way below 2 times that the width of pad work is become the meander Width size of meander shape antenna conductor, even if it is broadband to use small-sized chip aerial also can realize.
In addition, said here ' meander Width size ' is though the distance (identical with the meander width) between the two ends that under the situation of the meander shape antenna conductor of plane formula are the meander Width, but, under the situation of the two ends of feasible meander Width, then be the distance between sweep near crooked like that three-dimensional meander shape antenna conductor.The pad width is advisable to make to become 0.5 to 1.75 times of meander Width size, says to do becoming 1 to 1.5 times even more ideally and is advisable.It is desirable to, the meander pitch becomes close in power supply terminal one side, and one side becomes and dredges on the top, and will be installed as and make that part or all and ground wire figure of part that the meander pitch is close are overlapping.
Claims (8)
1. antenna assembly is characterized in that possessing:
Substrate;
Be installed to the chip aerial that possesses antenna conductor on the aforesaid substrate;
Be formed on the ground wire figure on the part of aforesaid substrate;
To the power supply terminal of above-mentioned chip aerial power supply, wherein
A part that is configured so that the part of above-mentioned power supply terminal side of above-mentioned power supply terminal and above-mentioned antenna conductor and above-mentioned ground wire figure is overlapping.
2. antenna assembly according to claim 1 is characterized in that: above-mentioned antenna conductor is a meander shape or spiral helicine.
3. antenna assembly according to claim 1, it is characterized in that: above-mentioned chip aerial, has meander shape antenna conductor, above-mentioned meander shape antenna conductor possesses the part that the close part of meander pitch and meander pitch are dredged, and will be installed as on aforesaid substrate and make that part or all and above-mentioned ground wire figure of part that the meander pitch is close are overlapping.
4. according to the antenna assembly of claim 1, it is characterized in that: possess antenna conductor and be that meander shape or helical form and above-mentioned antenna conductor possess the close part of meander pitch or screw pitch and the chip aerial of the part of dredging.
5. antenna assembly according to claim 4 is characterized in that: meander pitch or the close part of screw pitch are set at power supply terminal one side of above-mentioned antenna conductor, and thin part is set at top one side of above-mentioned antenna conductor.
6. antenna assembly according to claim 4 is characterized in that: the number of turn of the part that the turn ratio of the part that meander pitch or screw pitch are close is dredged is many.
7. antenna assembly according to claim 4 is characterized in that: the antenna that also possesses on the part that does not form ground wire figure that is configured on the aforesaid substrate is installed the pad of usefulness,
Above-mentioned chip aerial is installed to be and makes that the side and the ground wire figure that are provided with power supply terminal are overlapping, makes opposite side and above-mentioned pad overlapping,
The width of above-mentioned pad becomes below 2 times of meander Width size for above-mentioned meander shape antenna conductor.
8. antenna assembly according to claim 7 is characterized in that: the pad width becomes 0.5 to 1.75 times for the meander Width size of meander shape antenna conductor.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001030938A JP2002224796A (en) | 2001-02-07 | 2001-02-07 | Operation monitoring system for core making machine |
| JP030957/2001 | 2001-02-07 | ||
| JP030956/2001 | 2001-02-07 | ||
| JP2001030957 | 2001-02-07 | ||
| JP030938/2001 | 2001-02-07 | ||
| JP030958/2001 | 2001-02-07 | ||
| JP2001030956 | 2001-02-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1369928A CN1369928A (en) | 2002-09-18 |
| CN1276544C true CN1276544C (en) | 2006-09-20 |
Family
ID=27345930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02103563 Expired - Fee Related CN1276544C (en) | 2001-02-07 | 2002-02-07 | Antenna device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1276544C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418223C (en) * | 2005-04-15 | 2008-09-10 | 诠欣股份有限公司 | System chip capable of integrating micro-antenna |
| CN103222111A (en) * | 2010-11-19 | 2013-07-24 | 株式会社藤仓 | Antenna integrated harness |
| CN104143694B (en) * | 2013-05-06 | 2021-02-09 | 深圳富泰宏精密工业有限公司 | Antenna structure and wireless communication device using same |
-
2002
- 2002-02-07 CN CN 02103563 patent/CN1276544C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1369928A (en) | 2002-09-18 |
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