CN1324761C - Double-frequency antenna - Google Patents
Double-frequency antenna Download PDFInfo
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- CN1324761C CN1324761C CNB031051111A CN03105111A CN1324761C CN 1324761 C CN1324761 C CN 1324761C CN B031051111 A CNB031051111 A CN B031051111A CN 03105111 A CN03105111 A CN 03105111A CN 1324761 C CN1324761 C CN 1324761C
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Abstract
The present invention discloses a double-frequency antenna which comprises a multi-layer baseplate, a first metal conducting wire, a second metal conducting wire and a shaft sleeve structure, wherein the first metal conducting wire also comprises a first feed-in end and a first open circuit end, the equivalent current paths of the first feed-in end and the first open circuit end can form a quarter wavelength structure of the frequency of a second frequency band, and thus, the antenna can be used for transmitting and receiving the frequency of the second frequency band. The antenna can be used for transmitting and receiving the frequency of a first frequency band via the structure of the second metal conducting wire. In addition, the shaft sleeve structure formed outside the metal conducting wires is used for enlarging the frequency bandwidth of the frequency of the second frequency band.
Description
Technical field
The present invention relates to field of antenna, particularly a kind of dual-band antenna with wideband design.
Background of invention
Along with advancing by leaps and bounds of wireless communication technique, the Mobile Communications product has become the main flow of present stage sci-tech product, comprise mobile phone, PDA or notebook computer etc., these products are with after communication module group combines, not only can be connected to local-area network, transmitting-receiving e-mail, more can receive, make the function that reaches resource-sharing and data transmission each other as real time informations such as news, stocks.
To be applied in Wireless LAN is example, frequency range is the high-frequency range that belongs to ISM2.4GHz, only present ISM band (Industrial Scientific Medical Band), there are more and more many wireless telecommunications systems to use blue-tooth device (Blue Tooth), therefore use the communication apparatus of close frequency band can interfere with each other each other, comprise co-channel interference (Co-Channel Interference) and adjacent disturb frequently (Next-ChannelInterference), furthermore product is popularized too much with the frequency range product, interference problem heals and becomes serious, so present stage trend turned to another more the frequency band of high frequency (about 5.725-5.850GHz) develop.
With printing-type inverted F shaped antenna of the prior art is example, please refer to a substrate 10, a grounded metal 11, a strip metal 12, a short circuit pin 14 and the feed pin 16 of comprising shown in Figure 1, wherein grounded metal 11, strip metal 12, short circuit pin 14 and feed pin 16 are the printed circuit that is distributed on the substrate 10.Feed pin 16 is outwards to be lived in stretching by strip metal 12 in being connected to a match circuit (not shown), wherein, is not connected to each other to avoid the phenomenon that is short-circuited between feed pin 16 and the grounded metal 11.Parallel to each other between strip metal 12 and the grounded metal 11 again, and short circuit pin 14 is to be located at an end (short-circuit end) 18 of strip metal 12 and to be connected in grounded metal 11, the other end (open end) the 19th of itself and strip metal 12 forms the structure of open circuit-short circuit, and wherein the distance between open end and the short-circuit end is to be principle approximately with the quarter-wave.
If will satisfy the characteristic of double frequency transmission simultaneously, only need satisfy quarter-wave principle in theory than low-frequency range, but in fact not only return loss (Return Loss) is serious in another higher frequency band of transmitting, and the frequency of transmission band (about 8-9GHz) does not belong to existing communications protocol.So though known antenna assembly has the effect of double frequency, only having can be for transmission than the frequency of low-frequency range, the frequency of higher frequency band has no value at all.In view of this, by exposure of the present invention, not only reach the purpose that double frequency all can transmit simultaneously on existing communications protocol, the frequency bandwidth (bandwidth) that more increases the higher frequency band frequency increases the degree of freedom of transmission.
Summary of the invention
Purpose of the present invention is for providing a kind of design of dual-band antenna.
Another object of the present invention makes return loss (ReturnLoss) reduce for providing a kind of at the higher transmission band frequency, and has the dual-band antenna of broad frequency range design.
A kind of dual-band antenna can provide one first band frequency and one second band frequency to carry out the wireless signal transmission, wherein comprises:
One multilager base plate, it comprises one first substrate and one second substrate at least;
One first plain conductor is to be formed on this first substrate, and it comprises one first feed side and one first open end;
One second plain conductor, be to be formed on this second substrate, it comprises one second feed side, a spiral metal structure and one second open end, and wherein this second feed side is to utilize one first conductive through hole to be connected to the appropriate location of this first plain conductor: and
One oversleeve structure is the outside that is formed at described plain conductor;
First band frequency of this dual-band antenna transmission wherein, be by the generation of being resonated of the conductor structure between this first feed side and this second open end, this second band frequency is then by the generation of being resonated of the conductor structure between this first feed side and this first open end, and utilizes this oversleeve structure to increase the frequency range of this second band frequency.
Described dual-band antenna, wherein said second plain conductor also comprises a wave metal structure.
Described dual-band antenna, wherein said multilager base plate also comprise one the 3rd substrate, and this oversleeve structure further comprises:
One the first metal layer is to be made on the 3rd substrate;
One second metal level is a side edge surface that is made in this multilager base plate, and produces electric connection with this first metal layer;
One the 3rd metal level is to be made on the 3rd substrate; And
One the 4th metal level is to be made in the side edge surface of the multilager base plate of this second metal level relatively, and produces electric connection with the 3rd metal level.
Described dual-band antenna, the length of wherein said oversleeve structure are to be about 1/3 to 2/3 of this first plain conductor straight length length overall.
A kind of dual-band antenna can provide one first band frequency and one second band frequency to carry out the wireless signal transmission, wherein comprises:
One multilager base plate, it comprises one first substrate and one second substrate at least;
One first plain conductor, be to comprise a plurality of plain conductors of going up that are formed on this first substrate, with a plurality of plain conductors down that are formed on this second substrate, comprise one first feed side and one first open end again, described a plurality of plain conductors of going up see through this a plurality of plain conductors down of a plurality of second conductive through holes connections; And
One second plain conductor is to be formed on this second substrate, and it comprises one second feed side, a spiral metal structure and one second open end, and wherein this second feed side is to utilize one first conductive through hole to be connected to the appropriate location of this first plain conductor;
First band frequency of this dual-band antenna transmission wherein, be by the generation of being resonated of the conductor structure between this first feed side and this second open end, this second band frequency is then by the generation of being resonated of the conductor structure between this first feed side and this first open end.
Described dual-band antenna wherein also comprises an oversleeve structure, is the outside that is formed at described plain conductor.
Described dual-band antenna, wherein said multilager base plate also comprise one the 3rd substrate, and this oversleeve structure further comprises:
One the first metal layer is to be made on the 3rd substrate;
One second metal level is a side edge surface that is made in this multilager base plate, and produces electric connection with this first metal layer;
One the 3rd metal level is to be made on the 3rd substrate; And
One the 4th metal level is to be made in the side edge surface of the multilager base plate of this second metal level relatively, and produces electric connection with the 3rd metal level;
Wherein this oversleeve structure is in order to increase the frequency range of this first band frequency.
Described dual-band antenna, the length of wherein said oversleeve structure are to be about 1/3 to 2/3 of this first plain conductor straight length length overall.
Described dual-band antenna, wherein said second plain conductor also comprises a wave metal structure.
According to technical scheme provided by the invention, not only can reach the purpose that double frequency all can transmit simultaneously on existing communications protocol, the frequency bandwidth (bandwidth) that more increases the higher frequency band frequency increases the degree of freedom of transmission.
Description of drawings
Fig. 1 is a single-band antenna device schematic diagram of prior art;
Fig. 2 is the schematic diagram according to the double-frequency antenna unit of first embodiment of the invention:
Fig. 3 is the end view according to the double-frequency antenna unit of first embodiment of the invention;
Fig. 4 is the schematic diagram according to the double-frequency antenna unit of second embodiment of the invention;
Fig. 5 is the end view according to the double-frequency antenna unit of second embodiment of the invention;
Fig. 6 is the frequency response measurement figure according to the double-frequency antenna unit of second embodiment of the invention.
The figure number explanation
10 substrates, 11 grounded metals
12 strip metals, 14 short circuit pins
16 feed pins, 18 short-circuit ends
19 open ends, 20,40 multilager base plates
21,22,42 second feed sides, 41 first feed sides
23, plain conductor 24,44 first conductive through holes on 43
25,26,46 times plain conductors of 45 second conductive through holes
27,47 first plain conductors, 28,48 first open ends
29,49 the 3rd conductive through holes, 30,50 second plain conductors
31,51 spiral metal structures, 32,52 wave metal structures
33,53 second open ends, 34,54 open circuit metal tapes
35 first substrates, 37 second substrates
60 the first metal layers, 61 second metal levels
62 the 3rd metal levels 63 the 4th metal level
64 oversleeve structures 65 the 3rd substrate
Embodiment
The present invention is a kind of device design of dual-band antenna, the frequency of two kinds of frequency ranges such as one first band frequency and one second band frequency not only can be transmitted and receive to this design, and the transmitting bandwidth of higher frequency band frequency (second band frequency) is increased, increase the degree of freedom of high-band frequency transmission.Below introduce detailed description of the present invention.
According to first embodiment of the invention, provide a kind of in order to transmit the double-frequency antenna unit of one first band frequency and one second band frequency.Its structure comprises that a multilager base plate and the circuit that is distributed in the multilager base plate comprise: first plain conductor, second plain conductor.Wherein, in a preferred embodiment, first plain conductor is formed by being made in first substrate in the multilager base plate and the plain conductor up and down of second substrate, comprises one first feed side and one first open end in addition.Second plain conductor is to comprise, and spiral metal structure and wave metal structure are second substrates that is made in the multilager base plate, and sees through the appropriate location and second feed side that a conductive through hole connects first plain conductor, comprises one second open end in addition.The equivalent current path of wherein said first feed side to the first open end is to form the quarter-wave structure that is about second band frequency; The equivalent current path of first feed side to the second open end then forms the quarter-wave structure that is about first band frequency, makes antenna assembly have the function of double frequency transmission.
See also shown in Figure 2ly, it is the schematic diagram for dual-band antenna first embodiment of the present invention.Its structure comprises, a multilager base plate 20, first plain conductor 27, second plain conductor 30.About multilager base plate 20 Material Selection, in a preferred embodiment of the present invention, be to select low temperature co-fired multilayer ceramic substrate (Low-TemperatureCofired Ceramics for use, LTCC), come this antenna assembly of framework with 8 layers structure, in the sintering furnace of the many degree of 850-900 Celsius, with metallic circuit structure fabrications such as copper, silver, gold on multilayer ceramic substrate, form integrated ceramic component with run-in index printing coating process sintering, in addition, the material of multilager base plate 20 also can be selected multilayer board (PCB) materials such as FR-4, FR-5, PTFE for use.
Seeing also Fig. 3, is the end view for first embodiment of the invention.Explanation comprises the two-layer ceramic substrate at least in multilager base plate 20 structures, one first substrate 35 and one second substrate 37 are to make the metallic conducting wire structure of antenna of the present invention.In a preferred embodiment, first plain conductor 27 (can simultaneously with reference to Fig. 2), be to comprise a plurality of plain conductors 23 of going up that are formed on first substrate 35, with a plurality of plain conductors 26 down that are formed on second substrate 37, and see through the three-dimensional wavy structure that a plurality of second conductive through holes 25 are formed by connecting, have more one first feed side 21 and one first open end 28 in addition.First feed side 21 is in order to be connected to a feed circuit (not shown), and with the current path of first open end 28 distance be principle with the quarter-wave of second band frequency, also because the bending stereochemical structure of first plain conductor 27 makes that the straight length of antenna is shortened.And quarter-wave distance is the equivalent current path of oscillation signal, makes this antenna assembly be transmitted, receive second band frequency of higher-frequency (about 5-6GHz).In like manner, first plain conductor 27 also can be made in one deck ceramic substrate plane, and shape is also non-limiting in wavy kenel, and above embodiment gives an example, and is not in order to limit scope of the present invention.
Second plain conductor 30 is to be formed on second substrate 37.Its structure comprises a spiral metal structure 31 and a wave metal structure 32, comprises one second feed side 22 and one second open end 33 in addition.Wherein second feed side 22 is to utilize one first conductive through hole 24 to be connected to the appropriate location of described first plain conductor 27, and by the increase of the helical number of turns of spiral metal structure 31, produce inductive effect, make that the effective wavelength of HFS is elongated, effectively reduce the frequency that it can use frequency range.In addition, the way that also has about second open end 33 is to make an open circuit metal tape 34 in addition in first substrate, 35 positions of multilager base plate 20, sees through one the 3rd conductive through hole 29 again and is connected to wave metal structure 32.Wherein said metallic conducting wire structure is to select metal materials such as copper, silver, gold, in screen printing (Printing Screen) mode, is formed on the ceramic substrate.In addition, spiral metal structure 31 and wave metal structure 32 also can be made in different layers ceramic substrate plane respectively, and the shape of wave metal is also non-limiting in wavy kenel, and above embodiment gives an example, and is not in order to limit scope of the present invention.
The current path distance of first feed side 21 and second open end 33 (or open circuit metal tape 34) is a principle with the quarter-wave of first band frequency, also because the bending structure of spiral metal structure 31 and wave metal structure 32 makes that the straight length of antenna is shortened.And quarter-wave distance is the equivalent current path of oscillation signal, makes this antenna assembly be transmitted, receive first band frequency (about 2.4GHZ) than low frequency.
In sum, produce second band frequency of higher-frequency by 27 resonance of first plain conductor; And first plain conductor 27 produces first band frequency than low frequency in conjunction with the resonance of second plain conductor 30, and by the inductive effect that spiral metal structure 31 produces, makes this antenna assembly can transmit, receive the frequency of two frequency ranges.
According to second embodiment of the invention, provide a kind ofly in order to transmitting one first band frequency and one second band frequency, and have the double-frequency antenna unit of wideband design at second band frequency of higher-frequency.Its apparatus structure is more to increase an oversleeve (sleeve) structure in first embodiment, and it comprises a first metal layer, one second metal level, one the 3rd metal level and one the 4th metal level.Wherein the first metal layer and the 3rd metal level are on the 3rd substrate that is made in respectively in the multilager base plate, and produce electric connection with second metal level that is made in the substrate side surface and the 4th metal level respectively, make metal-layer structure form the shape of coating to first plain conductor, as same oversleeve (sleeve) structure, making the transmission of second band frequency that produced by the resonance of first plain conductor receive frequency range increases.
See also shown in Figure 4ly, it is the schematic diagram for dual-band antenna second embodiment of the present invention.Its structure comprises, a multilager base plate 40, first plain conductor 47, second plain conductor 50 and an oversleeve (sleeve) structure 64.Different with first embodiment of the invention is that present embodiment has increased by an oversleeve structure 64, is to comprise metal-layer structures such as a first metal layer 60, one second metal level 61, one the 3rd metal level 62 and one the 4th metal level 63.See also Fig. 5, wherein the first metal layer 60 and the 3rd metal level 62 are the 3rd substrates 65 that are made in respectively in the multilager base plate 40.In a preferred embodiment, the position of this 3rd substrate 65 is ceramic substrate layers of selecting to be different from described first substrate 35 and second substrate 37 and substrate between the two in multilager base plate 40, and the first metal layer 60 is contacted with other metallic circuit structures with the 3rd metal level 62.61 of second metal levels are made in a side edge surface of multilager base plate 40, and produce electric connection with the first metal layer 60; 63 of the 4th metal levels are made in substrate 40 another side edge surface of relative second metal level 61, and produce electric connection with the 3rd metal level 62.Described metal material can be selected metals such as copper, silver, gold, in the mode of screen printing (Printingscreen), is formed on the ceramic substrate.
Described oversleeve structure 64 starts from 41 places, first feed side, extends to the about 1/3-2/3 of first plain conductor, 47 straight lengths place, to the shape of first plain conductor, 47 formation coatings, as same oversleeve (Sleeve) structure.After adding this oversleeve structure 64, the CURRENT DISTRIBUTION of seeing into from the feed side can be along with frequency not be done very big change, and institute is not so that impedance also can significantly change along with frequency, therefore reach the wideband effect, make the frequency range of second band frequency that produces by 47 resonance of first plain conductor increase.
Please refer to shown in Figure 6ly, is the frequency response chart that measures according to second embodiment of the invention.Illustrate antenna assembly under the permissible situation of return loss (return loss) (S11＜-10dB) transmission that had of first frequency frequency range and second frequency frequency range, receive frequency range, in the frequency range scope that 80MHZ is arranged approximately than the first frequency frequency range (about 2.4GHZ) of low frequency; And include 4.9GHZ to 7.8GHZ at the second frequency frequency range frequency range of higher-frequency, scope comprises the different communications protocol in present stage each department, the different frequency range that makes different regions use all can reach the purpose of transmission and reception by dual-band antenna of the present invention, significantly increases the convenience that antenna uses.
Sum up describedly, dual-band antenna of the present invention design has following advantage:
(1) because the bending structure of first plain conductor with the bending flat structure of second plain conductor, makes the entire length of antenna assembly shorten many.
(2) because the inductive effect that the helical structure in second plain conductor produces makes that antenna assembly according to the present invention reaches the purpose that double frequency all can transmit, receive.
(3) oversleeve (sleeve) structure makes the frequency range of second band frequency of higher-frequency increase, and then increases the degree of freedom of antenna transmission, receive frequency, and the utilizability of antenna is significantly increased.
Though the present invention illustrates as above with preferred embodiment, so it is not only to terminate in described embodiment in order to limit the present invention's spirit with the invention entity, and the modification of being done in not breaking away from spirit of the present invention and scope all should be included in the patent claim.
Claims (5)
1, a kind of dual-band antenna can provide one first band frequency and one second band frequency to carry out the wireless signal transmission, it is characterized in that comprising:
One multilager base plate, it comprises one first substrate, one second substrate and one the 3rd substrate at least;
One first plain conductor is to be formed on this first substrate, and it comprises one first feed side and one first open end;
One second plain conductor, be to be formed on this second substrate, it comprises one second feed side, a spiral metal structure and one second open end, and wherein this second feed side is to utilize one first conductive through hole to be connected to the appropriate location of this first plain conductor: and
One oversleeve structure comprises:
One the first metal layer is to be made on the 3rd substrate;
One second metal level is a side edge surface that is made in this multilager base plate, and produces electric connection with this first metal layer;
One the 3rd metal level is to be made on the 3rd substrate; And
One the 4th metal level is to be made in the side edge surface of the multilager base plate of this second metal level relatively, and produces electric connection with the 3rd metal level;
The length of described oversleeve structure is to be 1/3 to 2/3 of this first plain conductor straight length length overall;
First band frequency of this dual-band antenna transmission wherein, be by the generation of being resonated of the conductor structure between this first feed side and this second open end, this second band frequency is then by the generation of being resonated of the conductor structure between this first feed side and this first open end, and utilizes this oversleeve structure to increase the frequency range of this second band frequency.
2, dual-band antenna as claimed in claim 1 is characterized in that: described second plain conductor also comprises a wave metal structure.
3, a kind of dual-band antenna can provide one first band frequency and one second band frequency to carry out the wireless signal transmission, it is characterized in that comprising:
One multilager base plate, it comprises one first substrate and one second substrate at least;
One first plain conductor, comprise a plurality of plain conductors of going up that are formed on this first substrate, with a plurality of plain conductors down that are formed on this second substrate, comprise one first feed side and one first open end again, described a plurality of plain conductors of going up see through this a plurality of plain conductors down of a plurality of second conductive through holes connections; And
One second plain conductor is to be formed on this second substrate, and it comprises one second feed side, a spiral metal structure and one second open end, and wherein this second feed side is to utilize one first conductive through hole to be connected to the appropriate location of this first plain conductor;
First band frequency of this dual-band antenna transmission wherein, be by the generation of being resonated of the conductor structure between this first feed side and this second open end, this second band frequency is then by the generation of being resonated of the conductor structure between this first feed side and this first open end.
4, dual-band antenna as claimed in claim 3 is characterized in that: described substrate also comprises one the 3rd substrate, and described dual-band antenna also comprises an oversleeve structure, and this oversleeve structure comprises:
One the first metal layer is to be made on the 3rd substrate;
One second metal level is a side edge surface that is made in this multilager base plate, and produces electric connection with this first metal layer;
One the 3rd metal level is to be made on the 3rd substrate; And
One the 4th metal level is to be made in the side edge surface of the multilager base plate of this second metal level relatively, and produces electric connection with the 3rd metal level;
Wherein this oversleeve structure is in order to increase the frequency range of this second band frequency; The length of described oversleeve structure is to be 1/3 to 2/3 of this first plain conductor straight length length overall.
5, dual-band antenna as claimed in claim 4 is characterized in that: described second plain conductor also comprises a wave metal structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031051111A CN1324761C (en) | 2003-03-03 | 2003-03-03 | Double-frequency antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031051111A CN1324761C (en) | 2003-03-03 | 2003-03-03 | Double-frequency antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1527436A CN1527436A (en) | 2004-09-08 |
| CN1324761C true CN1324761C (en) | 2007-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031051111A Expired - Fee Related CN1324761C (en) | 2003-03-03 | 2003-03-03 | Double-frequency antenna |
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| CN (1) | CN1324761C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103380541A (en) * | 2011-02-18 | 2013-10-30 | 西门子公司 | A meander line antenna |
| CN113690621B (en) * | 2021-08-30 | 2024-05-07 | 杭州泛利科技有限公司 | Miniaturized high efficiency bluetooth antenna based on multilayer PCB board |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6320545B1 (en) * | 1999-06-24 | 2001-11-20 | Murata Manufacturing Co., Ltd. | Surface-mount antenna and communication apparatus using the same |
| CN1375117A (en) * | 1999-07-22 | 2002-10-16 | 艾利森公司 | Flat dual frequency band antennas for wireless communicators |
-
2003
- 2003-03-03 CN CNB031051111A patent/CN1324761C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6320545B1 (en) * | 1999-06-24 | 2001-11-20 | Murata Manufacturing Co., Ltd. | Surface-mount antenna and communication apparatus using the same |
| CN1375117A (en) * | 1999-07-22 | 2002-10-16 | 艾利森公司 | Flat dual frequency band antennas for wireless communicators |
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| Publication number | Publication date |
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| CN1527436A (en) | 2004-09-08 |
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