WO2002084790A1 - Dual-band dual-polarized antenna array - Google Patents
Dual-band dual-polarized antenna array Download PDFInfo
- Publication number
- WO2002084790A1 WO2002084790A1 PCT/EP2001/004288 EP0104288W WO02084790A1 WO 2002084790 A1 WO2002084790 A1 WO 2002084790A1 EP 0104288 W EP0104288 W EP 0104288W WO 02084790 A1 WO02084790 A1 WO 02084790A1
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- WO
- WIPO (PCT)
- Prior art keywords
- elements
- dual
- band
- polarized antenna
- operating
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
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- 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
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
-
- 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
- H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
- H01Q5/42—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more imbricated arrays
Definitions
- the present invention refers generally to a new family of antenna arrays that are able to operate simultaneously at two different frequency bands, while featuring dual-polarization at both bands.
- the design is suitable for applications where the two bands are centered at two frequencies f1 and f2 such that the ratio between the larger frequency (f2) to the smaller frequency (f1) is f2/f1 ⁇ 1.5.
- the dual-band dual-polarization feature is achieved mainly by means of the physical position of the antenna elements within the array. Also, some particular antenna elements are newly disclosed to enhance the antenna performance.
- dual-band dual-polarization arrays are of most interest in for instance cellular telecommunication services.
- 2G second generation cellular services
- 3G third generation cellular services
- BTS base station
- patent PCT/ES99/00343 describes an interleaved antenna element configuration for general-purpose multiband arrays.
- a co-linear set-up of antenna elements is described there, where the use of multi-band antenna elements is required at those positions where antenna elements from different bands overlap.
- the general scope of that patent does not match the requirements of some particular applications. For instance it is difficult to achieve a dual-band behavior following the description of PCT/ES99/00343 when the frequency ratio between bands is below 1.5, as it is intended for the designs disclosed in the present invention.
- that solution is not necessarily cost-effective when an independent electrical down-tilt is required for each band.
- the present invention discloses a completely different solution based on dual-polarization single-band antenna elements, which are spatially arranged to minimize the antenna size.
- the present invention discloses a more compact solution which is achieved by means of a careful selection of the antenna element positions and the shape of said antenna elements which minimizes the coupling between them.
- several broadband solutions are described in the prior art to operate simultaneously at both bands.
- such solutions are not suitable if an independent and different down-tilt is required for each band, which is something that can be easily solved according to the present invention.
- the antenna architecture consists on an interleaving of two independent vertically linear single-band arrays such that the relative position of the elements minimizes the coupling between antennas.
- Said spatial arranging of the antenna elements contributes to keeping the antenna size reduced to a minimum extent.
- solid dots display the positions of the elements for the lower frequency f1
- the squares display the positions for the antenna elements for the upper frequency f2.
- Antenna elements for the higher frequency band f2 are aligned along a vertical axis with the desired spacing between elements.
- Said spacing is slightly smaller than a full-wavelength (typically below 98% the size of the shorter wavelength) for a maximum gain, although it can be readily seen that the spacing can be made shorter depending on the application.
- a second vertical column of elements for the lower frequency band f1 is aligned along a second vertical axis placed next to said first axis and substantially parallel to it.
- low-frequency elements are placed along a left axis while high-frequency elements are place along a right axis, but obviously the position of both axes could be exchanged such that low- frequency elements would be place on the right side and vice versa.
- the spacing between said axis is chosen to fall between 0.1 and 1.2 times the longer wavelength.
- the shorter wavelength determines the spacing between elements (11) at both axis. Usually a spacing below a 98% of said shorter wavelength is preferred to maximize gain while preventing the introduction of grating lobes in the upper band; this is possible due to the spacing between frequency bands which is always f2/f1 ⁇ 1.5 according to the present invention.
- elements for f2 are placed at certain positions along a vertical axis and horizontal axes such that the horizontal axes intersect both with the positions of said elements and the mid-point between elements at the neighbor axis; this ensures a maximum distance between elements and therefore a minimum coupling between elements of different bands.
- the array is easily fed by means of two-separate distribution networks.
- Corporate feed or taper networks in microstrip, strip-line, coaxial or any other conventional microwave network architecture described in the prior art can be used and do not constitute an characterizing part of the invention. It is interesting however to point out that by using independent networks an independent phasing of the elements at each band can be used within the present invention, which is in turn useful for introducing either a fix or adjustable electrical down-tilt of the radiation pattern at each band independently.
- any dual-polarized antenna elements for instance crossed dipole elements, patch elements
- a radiating element of reduced size is preferred to reduce the coupling between them
- the same basic configuration of dual-band array described here features different beam widths and shapes in the horizontal plane depending on the spacing between elements in the horizontal direction.
- several elements within the array can be placed at a shifted horizontal position with respect to either left or right axis according to the present invention.
- the shift with respect to said axis is smaller than 70% of the longer operating wavelength.
- a particular case of such a displacement consists on tilting a few degrees (always below 45°) one or both of said reference axis such that the displacement is uniformly increased either upwards or downwards.
- Fig.1.- shows a conventional side-by-side solution (7) for a dual-band 2G + 3G array (prior-art).
- Two conventional single band arrays (5) and (6) for each band are merged within a single ground-plane (8) and housed into a single radome.
- the horizontal width (9) of the resulting antenna system is inconvenient for aesthetical and environmental reasons. Notice that the spacing between elements at each particular bands (between dots and squares) is different for this prior art configuration.
- Fig.2.- shows a general spatial arranging of the antenna elements for the dual-band dual-polarization array.
- the solid dots (1) display the positions of the elements for the lower frequency f1
- the squares (2) display the positions for the antenna elements for the upper frequency f2.
- Elements are aligned along parallel axes (3) and (4).
- the spacing (11) between elements in the vertical position is the same at both bands. Notice that the horizontal axes (10) that define together with axis (3) the position (2) of the elements at frequency f2, are intersecting axis (4) at the mid-point between positions (1) for elements at frequency f1.
- the interleaved position in the vertical axis ensures minimum coupling between bands while keeping the width (9) of the ground-plane (8) and antenna package to the minimum extent.
- Fig. 3.- shows two particular examples (13) and (14) of dual-polarization space-filling miniature patch antennas that can be used to minimize the inter-band and intra-band coupling within the elements of the array.
- the white circles (15) with the inner central dot indicate the feed positions for dual orthogonal polarization.
- Fig.4.- shows an example where some elements (15) are shifted horizontally with respect to the vertical axis.
- Fig. 5.- shows an example where one of the axis (3) is slightly tilted from the vertical position defining another axis (3') the elements (2) corresponding to f2 are aligned along. This can be seen as a particular case of the general one described in Fig.4 where all the elements are sequentially displaced a fixed distance with respect to the upper neighbor.
- Fig.6.- shows a preferred embodiment of a dual-polarization dual-band array for simultaneous operation at GSM1800 (1710-1880 MHz) and UMTS (1900 MHz-2170 MHz).
- the antenna elements are dual-polarization patches with a space-filling perimeter as those described in Fig.3.
- FIG.2 An scheme of the basic layout for the spatial arranging (interleaving) of the antenna elements is shown in Fig.2.
- the solid dots (1) display the positions of the elements for the lower frequency f1
- the squares (2) display the positions for the antenna elements for the upper frequency f2.
- Antenna elements for the higher frequency band f2 are aligned along a vertical axis (3) with the desired spacing between elements (11 ).
- Said spacing is slightly smaller than a full-wavelength (typically below 98% the size of the shorter wavelength) for a maximum gain, although it can be readily seen that the spacing can be made shorter depending on the application.
- a second vertical column of elements for the lower frequency band f1 is aligned along a second vertical axis (4) placed next to said first axis (3) and substantially parallel to it.
- low-frequency elements are placed along the left axis (4) while high-frequency elements are place along the right axis (3), but obviously the position of both axes could be exchanged such that low-frequency elements would be place on the right side and vice versa.
- the spacing (9) between said axis (3) and (4) is chosen to fall between 0.1 and 1.2 times the longer wavelength.
- the shorter wavelength determines the spacing between elements (11) at both axis. Usually a spacing below a 98% of said shorter wavelength is preferred to maximize gain while preventing the introduction of grating lobes in the upper band; this is possible due to the spacing between frequency bands which is always f2/f1 ⁇ 1.5 according to the present invention.
- elements for f2 are placed at positions (2) along vertical axis (3) and horizontal axes (10) such that the horizontal axes (10) intersect both with the positions of said elements (2) and the mid-point (12) between elements (1) at the neighbor axis (4); this ensures a maximum distance between elements and therefore a minimum coupling between elements of different bands.
- the array is easily fed by means of two-separate distribution networks.
- Corporate feed or taper networks in microstrip, strip-line, coaxial or any other conventional microwave network architecture described in the prior art can be used and do not constitute an characterizing part of the invention. It is interesting however to point out that by using independent networks an independent phasing of the elements at each band can be used within the present invention, which is in turn useful for introducing either a fix or adjustable electrical down-tilt of the radiation pattern at each band independently.
- any other dual-band or broad-band feeding network described in the prior art can be also used within the spirit of the present invention.
- any dual-polarized antenna elements for instance crossed dipole elements, patch elements
- a radiating element of reduced size is preferred to reduce the coupling between them.
- a small dual-polarized patch element with a space-filling perimeter is proposed here as a particular example for a possible array implementation (Fig.3).
- other dual- polarized space-filling miniature antenna elements such as for instance those described in patent PCT/EP00/00411 , can be used as well.
- the same basic configuration of dual-band array described here features different beam widths and shapes in the horizontal plane depending on the spacing between elements in the horizontal direction.
- several elements within the array can be placed at a shifted horizontal position with respect to either axis (3) or (4) according to the present invention.
- the shift with respect to said axis (3) or (4) is smaller than 70% of the longer operating wavelength.
- a particular case of such a displacement consists on tilting a few degrees (always below 45°) one or both of said reference axis such that the displacement is uniformly increased either upwards or downwards.
- Fig.4 shows as an example a particular embodiment where the some elements are displaced from the axis
- Fig.5 shows another embodiment where the axis (3) and (4) are slightly tilted.
- other shifting and tilting schemes can be used for the same purpose within the scope of the present invention.
- the number of elements and the vertical extent of the array is not a substantial part of the invention; any number of elements can be chosen depending on the desired gain and directivity of the array. Also, the number of elements and vertical extent of the array does not need to be the same; any combination in the number of elements or vertical extent for each band can be optionally chosen within the spirit of the present invention.
- a preferred embodiment of the present invention is an array that operates simultaneously at the GSM1800 (1710-1880MHz) and UMTS (1900-2170 MHz) frequency bands.
- the antenna features ⁇ 45° dual-polarization at both bands and finds major application in cellular base stations (BTS) where both services are to be combined into a single site.
- BTS base stations
- the antenna is designed with 8 elements operating at GSM 1800 (13) and 8 elements operating at UMTS (14) to provide a directivity above 17 dBi.
- the elements are aligned along two different axes (3) and (4), one for each band.
- elements (13) for GSM1800 are interleaved in the vertical direction with respect to elements for UMTS (14) to reduce the coupling between elements by maximizing the distance between them, yet keeping a minimum distance between said axes (3) and (4).
- the spacing between axes (3) and (4) must be larger than 40 mm if an isolation between input ports above 30 dB (as usual for cellular systems) is desired.
- the number of elements can be enlarged or reduced beyond 8.
- the number of elements can be even different for each band to achieve different gains.
- the vertical spacing between elements must be chosen to fall within the range of 100 mm to 165 mm.
- the elements are mounted upon a substantially rectangular ground-plane (8) with an overall height within a range of 1100 mm up to 1500mm.
- any kind dual-polarized single-band radiating elements can be used for this antenna array within the scope of the present invention, such as for instance crossed dipoles or circular, squared or octagonal patches, however innovative space-filling patches such as those in drawings (13) and (14) are preferred here because they feature a smaller size (height, width, area) compared to other prior art geometries.
- Said space-filling patches can be manufactured using any kind of the well-known conventional techniques for microstrip patch antennas and for instance can be printed over a dielectric substrate such as epoxy glass-fiber (FR4) substrates or other specialized microwave substrates such as CuClad ® , Arlon ® or Rogers ® to name a few.
- FR4 epoxy glass-fiber
- Said elements are mounted parallel to a conducting ground-plane (8) and typically supported with a dielectric spacer. It is precisely the combination of the particular spatial arrangement of the elements (vertical interleaving and proximity of vertical axis) together with the reduced size and the space-filling shape of the patch antenna elements that the whole antenna size is reduced.
- the size of the antenna is basically the size of the ground-plane (8) which for this particular embodiment must be wider than 140 mm but it can be typically stretched below 200 mm, which is a major advantage for a minimum visual environmental impact on landscapes compared to other conventional solutions such as the one described in Fig.1
- the elements can be fed at the two orthogonal polarization feeding points located at the center of the circles (15) by means of several of the prior-art techniques for patch antennas, such as for instance a coaxial probe, a microstrip line under the patch or a slot on the ground-plane (8) coupled with a distribution network beyond said ground-plane.
- patch antennas such as for instance a coaxial probe, a microstrip line under the patch or a slot on the ground-plane (8) coupled with a distribution network beyond said ground-plane.
- four independent feeding and distribution networks (one for each band and polarization) can be used.
- said feeding networks are mounted on the back-side of the ground-plane and any of the well-known configurations for array networks such as for instance microstrip, coaxial or strip-line networks can be used since does not constitute an essential part of the invention.
- Fig.6 shows an embodiment where said feeding points are located at the inner side towards the center of the ground-plane, that is, at the right side of axis (4) for the lower band and at the left side of axis (3).
- any other embodiments can be used as well within the scope of the present invention, such as for instance: all elements with feeding points at the left part of their respective axes, all feeding points on the right side, some elements on the right side and some on the left side, or even some elements with a feeding point at each side of the corresponding axis is possible within the scope of the present invention.
- the overall antenna array with the elements, ground- plane and feeding network is mounted upon a conventional shielding metallic housing enclosing the back part of the ground-plane, said housing also acting for a support of the whole antenna.
- a conventional dielectric radome covering the radiating elements and protecting the whole antenna from weather conditions is also mounted and fixed to the housing as in any conventional base-station antenna.
- the antenna would naturally include 4 connectors (typically 7/16 connectors), one for each band and polarization, mounted at the bottom part of the ground-plane. Each connector is then been connected through a transmission line (such as for instance a coaxial cable) to the input port of each feeding network.
- a transmission line such as for instance a coaxial cable
- a filter duplexer can be used to combine the input ports of the +45° GSM1800 and UMTS networks into a single connector, and the -45° GSM1800 and UMTS networks into another single connector to yield a total of only two connectors.
- Said duplexer can be any duplexer with a 30 dB isolation between ports and does not constitute an essential part of the present invention.
- a broadband or dual-band network combining GSM1800 and UMTS for the +45° and another one for the -45° polarization could be used instead of the diplexer, which yields to a two-connector configuration as well.
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01929562A EP1380069B1 (en) | 2001-04-16 | 2001-04-16 | Dual-band dual-polarized antenna array |
MXPA03009485A MXPA03009485A (en) | 2001-04-16 | 2001-04-16 | Dual-band dual-polarized antenna array. |
BR0116985-8A BR0116985A (en) | 2001-04-16 | 2001-04-16 | Dual band and dual polarization antenna array |
ES01929562T ES2287124T3 (en) | 2001-04-16 | 2001-04-16 | MATRIX OF DOUBLE BAND AND DOUBLE POLARIZATION ANTENNAS. |
AT01929562T ATE364238T1 (en) | 2001-04-16 | 2001-04-16 | DOUBLE BAND DUAL POLARIZED GROUP ANTENNA |
DE60128837T DE60128837T2 (en) | 2001-04-16 | 2001-04-16 | DOUBLE-BANDED DUAL-POLARIZED GROUP ANTENNA |
PCT/EP2001/004288 WO2002084790A1 (en) | 2001-04-16 | 2001-04-16 | Dual-band dual-polarized antenna array |
CNA018232531A CN1507673A (en) | 2001-04-16 | 2001-04-16 | Dual-band dual-polarized antenna array |
US10/686,223 US6937206B2 (en) | 2001-04-16 | 2003-10-15 | Dual-band dual-polarized antenna array |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2001/004288 WO2002084790A1 (en) | 2001-04-16 | 2001-04-16 | Dual-band dual-polarized antenna array |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/686,223 Continuation US6937206B2 (en) | 2001-04-16 | 2003-10-15 | Dual-band dual-polarized antenna array |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002084790A1 true WO2002084790A1 (en) | 2002-10-24 |
Family
ID=8164372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/004288 WO2002084790A1 (en) | 2001-04-16 | 2001-04-16 | Dual-band dual-polarized antenna array |
Country Status (9)
Country | Link |
---|---|
US (1) | US6937206B2 (en) |
EP (1) | EP1380069B1 (en) |
CN (1) | CN1507673A (en) |
AT (1) | ATE364238T1 (en) |
BR (1) | BR0116985A (en) |
DE (1) | DE60128837T2 (en) |
ES (1) | ES2287124T3 (en) |
MX (1) | MXPA03009485A (en) |
WO (1) | WO2002084790A1 (en) |
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Also Published As
Publication number | Publication date |
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MXPA03009485A (en) | 2004-05-05 |
DE60128837T2 (en) | 2008-02-28 |
ES2287124T3 (en) | 2007-12-16 |
US20040145526A1 (en) | 2004-07-29 |
EP1380069B1 (en) | 2007-06-06 |
EP1380069A1 (en) | 2004-01-14 |
ATE364238T1 (en) | 2007-06-15 |
CN1507673A (en) | 2004-06-23 |
BR0116985A (en) | 2004-12-21 |
DE60128837D1 (en) | 2007-07-19 |
US6937206B2 (en) | 2005-08-30 |
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