CN1222080C - Small multiple band antenna - Google Patents

Small multiple band antenna Download PDF

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Publication number
CN1222080C
CN1222080C CNB008113807A CN00811380A CN1222080C CN 1222080 C CN1222080 C CN 1222080C CN B008113807 A CNB008113807 A CN B008113807A CN 00811380 A CN00811380 A CN 00811380A CN 1222080 C CN1222080 C CN 1222080C
Authority
CN
China
Prior art keywords
antenna
feeding network
multiband
antenna elements
antenna element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB008113807A
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Chinese (zh)
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CN1369121A (en
Inventor
托马斯·鲁特福斯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Laird Technologies AB
Original Assignee
AMC Centurion AB
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Filing date
Publication date
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Publication of CN1369121A publication Critical patent/CN1369121A/en
Application granted granted Critical
Publication of CN1222080C publication Critical patent/CN1222080C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
  • Waveguide Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

A multiple frequency band antenna, comprising at least two antenna elements (10, 11, 20, 21, 60) connected via an antenna feeding network to a radio frequency source/receiver, said antenna elements being operable in at least two non-overlapping frequency bands. The antenna feeding network comprises means for connection to the radio frequency source/receiver, means for direct electrical connection to a feed-end portion of a first antenna element (10, 20) being operable in a lowermost frequency band, and means for capacitive coupling (24, 90) to a feed-end portion of at least a second antenna element being operable in a frequency band which is higher than said lowermost frequency band. Further, the capacitive coupling being dimensioned to provide a relatively high impedance for frequencies in said lowermost frequency band and a relatively low impedance for frequencies in said higher frequency band.

Description

Small multiple band antenna and have the mobile phone of this antenna
Technical field:
The present invention relates to a kind of multiband antenna.Especially, the present invention relates to a kind of multiband antenna, require an antenna element to be connected to radio frequency source/receiver by a capacitive element with a feeding network.
Background technology:
When two antenna radiators leaned on very closely mutually, common problem was mutual coupling strong between them, and when these two radiators directly are electrically connected mutually, this problem will further be strengthened.The efficient and the bandwidth of antenna element lowered in this mutual coupling.If only reduce the size of antenna element, will cause the reduction of relative bandwidth, to the multiband antenna that is made of the miniature antenna element that leans on very closely mutually, this problem is very serious.The independent external circuit that is provided for connecting radio frequency source/receiver for each antenna element is a possible solution, but needs further for this system's increase element and need these elements of individual processing, and this will increase the cost of multiband antenna.All the time with regard to lack a kind of in manufacture process without any need for add ons or step and the method for an integrated feeding network, this feeding network comprises the capacitive element that the antenna element that can work is connected with radio frequency source/receiver and with each antenna element in high frequency band.
Capacitive between the antenna element in a multiband antenna or inductive coupledly in many patent documentations, described, a nearest example be WO99/26314 (MotecoAB, P.O.Box910, S-39129Kalmar, Sweden).The document discloses a kind of double frequency band aerial, and this double frequency band aerial has two fixed antenna elements that are used for position of readiness, and two extensible antenna elements that are used for talking position.Each is used for the antenna element of position of readiness and antenna element that each is used for talking position capacitive ground/be coupled mutually separately perceptually.This coupling is by making larger-diameter antenna element around antenna element part or overlapping fully realization the than minor diameter.This coupling takes place along antenna element or its part, and capacitive couplings can not be calculated as an independent parameter individually, but change capacitively coupled degree by the overlapping degree that changes between the antenna element, the design that perhaps changes antenna element also will influence the radiofrequency characteristics of antenna element.
WO 98/49747 (Galtronics Ltd, P.O. Box 1589,14115 TiberiasIsrael) discloses a kind of double frequency band aerial that is made of two antenna elements, and these two antenna elements can be worked in two different frequencies.In each embodiment, these two antenna elements all are described to the linear antenna element, or rod or spirality, and these two antenna elements arrange in the orthoscopic mode mutually, and one is positioned on another.The ground coupling of the mutual capacitive of these two antenna elements, and in the embodiment that each is described this, all be by the lower end near top element, the top of following element being provided with, perhaps being coupled with the partly overlapping capacitive that realizes in the bottom of top element by top with following element.When the height of double frequency band aerial when not being very important, this method is suitable for, and therefore this method is just not too suitable concerning small-sized antenna assembly.
Summary of the invention:
An object of the present invention is to provide a kind of feeding network that is used for multiband antenna, can avoid about coupling problems between each antenna element that directly is electrically connected mutually.Another object of the present invention provides a kind of feeding network, and it can provide the coupling with radio frequency source/receiver, and this feeding network can combine with antenna.Therefore except that those produce the step of antenna element and supporting structure thereof, make without any need for other manufacturing step, thereby the feeding network of a kind of low cost and good rigidly is provided.
These and other objects obtain by the described antenna assembly with a feeding network of the characteristic of claim 1.When this feeding network directly mutually is electrically connected when antenna element, by capacitively being coupled to second antenna element, and the electric capacity by selecting capacity cell so that in the frequency that the lowest band element can be worked the impedance of electric capacity very high, thereby avoid the generation problem.This is decoupling high frequency band element from the lower band element effectively just, thus reduce since the coupling between the element with the problem that produces.This has simplified the structure that has mutually near the antenna of two miniature antenna elements arranging, wherein since the coupled problem between the element that galvanomagnetic effect causes exist.Certainly, when element is not very little and closely when being provided with, this feeding network is favourable equally, although this feeding network to the small size antenna advantageous particularly so that capacitively coupled impedance is very high in the frequency that the lowest band element can be worked.Therefore, verified, as described herein, second antenna element capacitively is coupled to the bandwidth that feeding network has increased lower band, and can increases the gross efficiency of multiband antenna.
When calculating the electric capacity of capacity cell, also may consider the aspect of impedance and radio frequency source/receiver coupling, this provides the extra degree of freedom for designing a multiband antenna element.If comprising the feeding network of capacitive element is when making as the part of antenna assembly, then may reduce the quantity that radio frequency source/receiver is the required add ons of impedance matching, still keep making the low cost of feeding network simultaneously.
Feeding network prolonged and need the capacitive element of feeding network carefully be calculated when having the embodiment of two above antenna elements.When in a characteristic frequency operational antennas, a specific antenna element can be worked in this frequency, the impedance that all upper frequency antenna elements is connected to the capacitor of this feeding network should be very high in case its effectively described upper frequency element is separated from this feeding network.The ratio of electric capacity that is connected two capacitive elements of two antenna elements can working in two side frequencies preferably should be about 1 to 10.Certainly, be that the designed best ratio of a specific antenna changes with situation.
Feeding network also provides by the feed end part of specific antenna element and being electrically connected of radio frequency source/receiver.This feeding network is to reach with the best of radio frequency source/receiver to be electrically connected, and designs for reaching best radiofrequency characteristics, and this may comprise considers and radio frequency source/receiver impedance for matching, and mechanical strength and rigidity.If when the remainder of the feed of feeding network part and feeding network can be made as a part of antenna assembly, this was other benefit.
Description of drawings:
Fig. 1 is according to first embodiment of the invention, has the end view of the antenna of two helical antenna elements and a feeding network;
Fig. 2 is the plan view of second element with antenna of two bent antenna elements and a feeding network;
Fig. 3 is the plan view of the 3rd embodiment, has two bent antenna elements and a feeding network equally;
Fig. 4 is the end view of antenna element shown in Fig. 3 and feeding network;
Fig. 5 is the plan view of the 4th embodiment, has first and second antenna elements that are positioned on the substrate two sides;
Fig. 6 is the plan view with the 5th embodiment of a multi layer substrate and three bent antenna elements;
Fig. 7 shows the 6th embodiment with two antenna elements;
Fig. 8 shows the vertical view of Fig. 7 embodiment under its folded condition;
Fig. 9 shows the 7th embodiment with two antenna elements, and wherein capacitive couplings realizes with a discrete capacitor.
Embodiment:
First embodiment as shown in Figure 1 comprises two helical antenna elements 10,11 that inside is mutually nested, and wherein feeding network is made of the coil recess 12,13 of these two elements.Less diameter coil groove 13 is positioned at than large-diameter coil groove 12, and this two coil recess 12,13 mechanically are fixed together mutually by dielectric 14.This dielectric and can provide capacitive coupling between the coil recess 12,13 in the volume between the coil recess 12,13.External coil groove 12 is directly electrically connected to radio frequency source/receiver.
Second embodiment (Fig. 2) comprises two two bent antenna elements 20,21 that are positioned on the substrate upper surface.Provide feeding network by parts 23 that are used to be electrically connected to radio frequency source/receiver, be used for capacitive couplings and be positioned at the surface identical with antenna element 20,21 to the capacitive part 24 of second antenna element with tongue piece or form of springs.Therefore, the capacitive couplings parts 24 of feeding network are provided by two parts of the feeding network that extends in parallel with a near mutual distances.
In the 3rd embodiment, as shown in Figure 3, the first bent antenna element 20 and the second bent antenna element 21 similarly are positioned at the upper surface of a substrate, and feeding network has the part that is positioned at upper surface and lower surface, and have be used for by this substrate capacitance be coupled to the parts 24 of the feed end part of second antenna element, be used to be directly electrically connected to the feed end parts partly of first antenna element, and the parts that are used to be electrically connected to radio frequency source/receiver.The upper and lower of feeding network is electrically connected with a current-carrying part 41 that extends through this substrate.
Fig. 4 is the end view of the 3rd embodiment shown in Fig. 3, wherein is connected to the top that is used for being positioned at as shown in the figure to second antenna element 21 of the parts 24 of feeding network by substrate 40 capacitive couplings substrate 40.In this figure, only show the feed end of first antenna element 20, also show the current-carrying part 41 of the feeding network that extends through substrate.
Fig. 5 shows the 4th embodiment that has the first bent antenna element 20 on the upper surface that is positioned at a substrate and be positioned at second antenna element 21 of this basic bottom.Feeding network extends on the two sides of substrate, and the lower conducting layer of the top conductive layer of feeding network part and this feeding network partly is electrically connected mutually by a capacitive part 24.The top conductive layer part of this feeding network also comprises a feed end part 50.
Fig. 6 shows the 5th embodiment with a multi layer substrate.This substrate has between the upper surface that lays respectively at a top substrate, the upper and lower substrate and three the bent antenna elements 20,60,21 on the lower surface of lower substrate.As shown in the figure, the size of capacitive element 61,62 and relevant capacitance value are different capacitively being coupled between two antenna elements 60,21 of feeding network.Therefore, the ratio of electric capacity can be set by the size of selecting each capacitive element 61,62, and these electric capacity preferably are arranged in the time and have only an element to be strongly coupled to radio frequency source.By rough estimation, 1: 10 ratio is just enough, but the absolute value of this ratio and electric capacity will change according to the actual design of multiband antenna element.It should be set to, and the impedance of two electric capacity is all very high in the frequency that lowest band element 20 can be worked.And in the frequency that midband element 60 can be worked, the impedance of capacity cell that is coupling in the element 21 that can work in the highest frequency is very high.
Fig. 7 shows has the 6th embodiment that is positioned at two antenna elements 20,21 on the flexible substrate one side, purpose is by folding this substrate, so that this substrate along the circumferential direction prolongs more than the whole circle, the conductive region 24 of two prolongations over each other and they between have a substrate layer, thereby obtain to be coupled to by this substrate the capacitive couplings of second antenna element from feeding network.Preferably straight antenna element may be folding around a suitable framework 80 (as shown in Figure 8) in second processing procedure in initial manufacture, perhaps may fold with the additive method of the pinpoint accuracy of the position that can guarantee two conductive regions 24 respect to one another.Special advantage of present embodiment is only to need a conductive layer concerning the bent antenna element, and does not need add ons or step in manufacture process.And antenna size is also very little after manufacturing is finished.Fig. 8 shows the vertical view of embodiment under folded condition of Fig. 7.
The 7th embodiment as shown in Figure 9 comprises two bent antenna elements 20,21 that are positioned at a substrate upper surface, just as among second embodiment.The capacitive element of realizing as a part of feeding network among the embodiment is provided by an independent discrete capacitor 90 in the present embodiment in the above.The advantage of present embodiment is that electric capacity can be set to any desirable value, and need not to take disproportionate major part on this substrate surface.Yet, to compare with the above embodiments, the shortcoming of present embodiment is to need additional step in manufacture process.
Although described the present invention in conjunction with many preferred embodiments, be to be understood that not deviating from by appended claims in the defined scope of the present invention, can also make multiple change.A kind of such may changing is that feeding network described in the invention is applied to by neither spirality neither crooked shape, but other shapes, multiband antenna as whiplike antenna element composition, perhaps apply it to the multiband antenna that constitutes, perhaps apply it in the multiband antenna combination with fixing and scalable part by dissimilar antenna elements.

Claims (13)

1, a kind of multiband antenna comprises at least two antenna elements that are connected to one radio frequency source/receiver via an antenna feeding network, and described antenna element can be worked at least two nonoverlapping frequency bands, it is characterized in that:
Described antenna feeding network comprises the parts that are used to be connected to radio frequency source/receiver; Be used to be directly electrically connected to the feed end parts partly of first antenna element that in lowest band, can work; And be used for the parts (24) of capacitive couplings to the feed end of at least one second antenna element that in than the high frequency band of described lowest band, can work part,
Described capacitively coupled size is determined to be to the frequency in the described lowest band provides high relatively impedance, and provides low relatively impedance for the frequency in the described high frequency band.
2, multiband antenna as claimed in claim 1 is characterized in that described at least two antenna elements closely are arranged side by side mutually.
3, multiband antenna as claimed in claim 1 is characterized in that described at least two antenna element inside are mutually nested.
4,, it is characterized in that described at least two antenna elements are helical antenna elements as any one described multiband antenna among the claim 1-3.
5, multiband antenna as claimed in claim 4 is characterized in that:
Described antenna feeding network comprises that at least two inside are mutually nested, forms the ceoncentrically wound coil groove (12,13) of the feed end part of described helical antenna elements;
Described coil recess capacitively intercouples by a dielectric (14); And,
One in the described coil recess (12,13) is directly electrically connected to described radio frequency source/receiver.
6, as any one described multiband antenna among the claim 1-3, it is characterized in that:
Described at least two antenna elements are bent antenna elements,
Each takes to be positioned at the form of an on-chip conductive layer.
7, multiband antenna as claimed in claim 6 is characterized in that described at least two bent antenna elements are positioned on the identical faces of described substrate.
8, multiband antenna as claimed in claim 7 is characterized in that the described parts that are used to be connected to radio frequency source/receiver are positioned at the opposite face of described substrate.
9, multiband antenna as claimed in claim 6 is characterized in that:
Described at least two antenna elements are positioned on the opposite face of described substrate,
Described second antenna element by this substrate capacitance be coupled to described feeding network.
10, multiband antenna as claimed in claim 7 is characterized in that: described substrate circumferentially extends more than the whole circle so that described second antenna element by described substrate capacitance be coupled to described feeding network.
11, multiband antenna as claimed in claim 6 is characterized in that: provide the part of capacitively coupled described feeding network between the antenna element to be provided by a discrete capacitor (90).
12, multiband antenna as claimed in claim 6 is characterized in that: the described parts that are used to be connected to radio frequency source/receiver comprise a current-carrying part that extends to described first element by described substrate.
13, a kind of mobile phone has as the described antenna of above-mentioned claim 1.
CNB008113807A 1999-08-11 2000-08-04 Small multiple band antenna Expired - Fee Related CN1222080C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE99028789 1999-08-11
SE9902878A SE514515C2 (en) 1999-08-11 1999-08-11 Compact multi-band antenna

Publications (2)

Publication Number Publication Date
CN1369121A CN1369121A (en) 2002-09-11
CN1222080C true CN1222080C (en) 2005-10-05

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CNB008113807A Expired - Fee Related CN1222080C (en) 1999-08-11 2000-08-04 Small multiple band antenna

Country Status (8)

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EP (1) EP1210745B1 (en)
KR (1) KR100703941B1 (en)
CN (1) CN1222080C (en)
AT (1) ATE348414T1 (en)
AU (1) AU6602700A (en)
DE (1) DE60032369T2 (en)
SE (1) SE514515C2 (en)
WO (1) WO2001011721A1 (en)

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CN104868229A (en) * 2014-02-20 2015-08-26 现代自动车株式会社 Dual Band Pcb Antenna For Vehicle

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CN103296488A (en) * 2013-05-30 2013-09-11 华为技术有限公司 Feed network device, antenna feed system and base station
CN103296488B (en) * 2013-05-30 2015-05-27 华为技术有限公司 Feed network device, antenna feed system and base station
CN104868229A (en) * 2014-02-20 2015-08-26 现代自动车株式会社 Dual Band Pcb Antenna For Vehicle

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Publication number Publication date
CN1369121A (en) 2002-09-11
DE60032369D1 (en) 2007-01-25
ATE348414T1 (en) 2007-01-15
SE9902878L (en) 2001-03-05
DE60032369T2 (en) 2007-09-27
EP1210745A1 (en) 2002-06-05
WO2001011721A1 (en) 2001-02-15
SE9902878D0 (en) 1999-08-11
KR20020026361A (en) 2002-04-09
EP1210745B1 (en) 2006-12-13
SE514515C2 (en) 2001-03-05
KR100703941B1 (en) 2007-04-04
AU6602700A (en) 2001-03-05

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