|Veröffentlichungsdatum||22. Mai 2014|
|Eingetragen||12. Nov. 2013|
|Prioritätsdatum||15. Nov. 2012|
|Veröffentlichungsnummer||PCT/2013/60079, PCT/IB/13/060079, PCT/IB/13/60079, PCT/IB/2013/060079, PCT/IB/2013/60079, PCT/IB13/060079, PCT/IB13/60079, PCT/IB13060079, PCT/IB1360079, PCT/IB2013/060079, PCT/IB2013/60079, PCT/IB2013060079, PCT/IB201360079, WO 2014/076635 A1, WO 2014076635 A1, WO 2014076635A1, WO-A1-2014076635, WO2014/076635A1, WO2014076635 A1, WO2014076635A1|
|Erfinder||Andries Petrus Cronje Fourie, Mark Pierre HAARHOFF, Derek Colin NITCH|
|Antragsteller||Poynting Antennas (Pty) Limited|
|Zitat exportieren||BiBTeX, EndNote, RefMan|
|Patentzitate (5), Nichtpatentzitate (1), Klassifizierungen (11), Juristische Ereignisse (3)|
|Externe Links: Patentscope, Espacenet|
BROAD BAND CROSS POLARIZED ANTENNA ARRANGEMENT
INTRODUCTION AND BACKGROUND
This invention relates to an antenna assembly more particularly a broad band dual polarized assembly.
With the long term evolution ("LTE") of networks such as 2G, 3G and 4G more sophisticated antenna arrangements are required to provide multiple input multiple output ("Mi o") and diversity support for the networks at customer or user premise equipment. The known antenna arrangements do not cover the broad bandwidth required whilst also providing two ports each carrying a different polarization.
OBJECT OF THE INVENTION
Accordingly, it is an object of the present invention to provide an alternative antenna arrangement with which the applicant believes the aforementioned disadvantages may at least be alleviated or which may provide a useful alternative for the known arrangements.
SUMMARY OF THE INVENTION
According to the invention there is provided an antenna arrangement comprising: - at least first and second elongate antennas each comprising an etched conductive pattern having a length I, width w and thickness d on a substrate;
- each antenna covering a frequency band comprising frequencies in a first band region and at least one of a second band region and a third band region, the first band region comprising frequencies in the range 700MHz to 1000MHz, the second band region comprising frequencies in the range 1 700MHz to 2200MHz and the third band region comprising frequencies in the range 2500MHz to 2700MHz;
- the first and second antennas being mounted in cross configuration relative to one another; and
- the length I of the conductive pattern being smaller than 0.5λ of the lowest frequency in the frequency band, w_ < I/5 and d_< w/5.
Preferably the frequency band comprises frequencies in all of the first second and third band regions. More preferably each antenna covers frequencies in the band 700MHz to 2700MHz.
The conductive pattern of at least the first antennas may be provided on first and second faces of the substrate. The substrate may typically be plate-like and the conductive pattern may comprise a first part on a first face of the substrate and a second part on an opposite face. The conductive pattern may be formed on the substrate according to any suitable technique including a printed circuit board manufacturing technique.
The first and second antennas may be identical to one another in shape and configuration.
The first and second antennas are preferably mounted at right angles relative to one another.
The substrates of the first and second antennas may be mounted in spaced and parallel planes.
The antennas may be mounted in a hermitically sealed housing. The housing may comprise means for mounting the housing on a pole or against a vertical surface such as a wall or window.
The antennas may be suspended in the housing by respective one ends of the substrates. The antennas may be center fed towards said respective one ends.
There may be provided a cross connector of an insulating material comprising a first formation for removably receiving the substrate of the first antenna and a second formation for removably receiving the substrate of the second antenna to secure the first and second antennas at right angles relative to one another and suitably spaced from one another.
Also included within the scope of the invention is an antenna as herein defined and/or described.
Still further included within the scope of the invention is customer premise equipment for a radio frequency network which equipment comprises an antenna arrangement as herein defined and/or described.
BRIEF DESCRIPTION OF THE ACCOMPANYING DIAGRAMS
The invention will now further be described, by way of example only, with reference to the accompanying diagrams wherein:
figure 1 is a diagrammatic perspective view of an antenna arrangement;
figure 2 is a diagrammatic representation of a frequency band covered by antennas of the arrangement;
figure 3 is a plan view onto one face of a substrate of one antenna of the assembly showing a first part of a conductive pattern of the antenna thereon; figure 4 is a plan view onto an opposite face of the substrate of the one antenna of the assembly showing a second part of the conductive pattern of the antenna thereon;
figure 5 is a side view of the substrate and conductive pattern.
figure 6 diagrammatic perspective view of the antenna arrangement mounted in a housing therefor and parts of which are shown in broken lines for improved clarity.
DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
An antenna arrangement is generally designated by the reference numeral 10 in the diagrams.
The antenna arrangement 10 comprises at least a first elongate antenna 12 and a second elongate antenna 14. Each of the first and second antennas comprise an etched conductive pattern 16 comprising a first part 16.1 and a second part 16.2 having a form factor which is made up by a length I, width w and thickness d provided on a substrate 18. which is typically and preferably flat and plate-like. Each antenna covers a frequency band 20 (shown in figure 2) comprising frequencies in a first band region 20.1 and at least one of a second band region 20.2 and a third band region 20.3. As shown in figure 2, the first band region comprises frequencies in the range 700MHz to 1000MHz, the second band region comprises frequencies in the range 1700MHz to 2200MHz and the third band region comprises frequencies in the range 2500MHz to 2700MHz. Preferably, both antennas cover a frequency band comprising frequencies in all three band regions, so that each antenna is a broadband antenna having a frequency ratio of larger than 3:1 . As shown in figure 1 , the first antenna 12 and the second antenna are mounted in cross configuration relative to one another.
The antennas 12 and 14 are identical in shape and configuration and therefore only antenna 12 will be described in further detail with reference to figures 3 to 5. The first part 16.1 of the conductive pattern has a length
11 and is provide on one face of the substrate 18. The second part 16.2 of the conductive pattern has a length \g and is provide on the opposite face of the substrate. The combined length I of the conductive pattern 16 is +
12 and is smaller than 0.5A of the lowest frequency, i.e. 700Mhz in the frequency band 20, w < |/5 and d_< w/5.
As shown in figure 6, the antennas 12 and 14 are mounted towards their respective one ends 32, 34 with the respective substrates in parallel spaced relation in a housing 30. The antennas are centre fed at 36 towards their respective one ends 32 and 34. At 36 there is also provided a via between the first part 16.1 and the second part 16.2 of the conductive pattern 16. The antennas are mounted at right angles relative to one another. To this end, a X-configured connector 38 of an isolating material is provided. The connector 38 comprises a first channel-type formation 40 for removably receiving in clip-in and clip-out fashion the substrate 18 of the first antenna and a second channel-type formation 42 for removably receiving in clip-in and clip-out fashion the substrate 18 of the second antenna.
When so held by the connector 38, the conductive patterns are located in respective planes and the planes are parallel to one another. The spacing between the parallel planes is such that interaction and/or interference between the first and second antennas is reduced and so that independent operation is facilitated.
The housing 30 is configured to be hermitically sealed and to provide access to first and second cables 50 and 52 each carrying a respective polarization. The housing 30 comprises any suitable means for mounting the housing on a pole or against a wail and any suitable means including a sucker type means 54 for mounting the housing against a window.
As shown in figure 6, the antennas may be suspended in the housing from a removable lid 62 for the housing. The antennas are preferably suspended from integral formations 60 on the lid 62. With the orthogonally mounted antennas, the arrangement is capable of handling signals having a 90 degree polarization differential and these signals are conducted by the cables 50 and 52 respectively.
The antenna arrangement may fins particular application as part of end user or customer premises equipment in a radio frequency network, including a cellular network.
It will be appreciated that the arrangement could be be used as a receiving arrangement or as a transmitting arrangement or both.
|EP2009735A1 *||22. Juni 2007||31. Dez. 2008||Philippe Herman||Antenna with diversity of polarisation for transmitting and/or receiving audio and/or video signals|
|JPH06177635A *||Titel nicht verfügbar|
|US6018324 *||29. Okt. 1997||25. Jan. 2000||Northern Telecom Limited||Omni-directional dipole antenna with a self balancing feed arrangement|
|US6100848 *||20. März 1998||8. Aug. 2000||Ericsson Inc.||Multiple band printed monopole antenna|
|US20100171675 *||6. Juni 2008||8. Juli 2010||Carmen Borja||Dual-polarized radiating element, dual-band dual-polarized antenna assembly and dual-polarized antenna array|
|Internationale Klassifikation||H01Q9/16, H01Q1/38, H01Q5/00, H01Q21/24, H01Q1/12|
|Unternehmensklassifikation||H01Q5/364, H01Q5/40, H01Q9/16, H01Q1/38, H01Q21/24, H01Q1/1221|
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