WO2005064742A1 - An antenna arrangement for a portable radio communication device - Google Patents

An antenna arrangement for a portable radio communication device Download PDF

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Publication number
WO2005064742A1
WO2005064742A1 PCT/SE2004/001852 SE2004001852W WO2005064742A1 WO 2005064742 A1 WO2005064742 A1 WO 2005064742A1 SE 2004001852 W SE2004001852 W SE 2004001852W WO 2005064742 A1 WO2005064742 A1 WO 2005064742A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiating elements
antenna arrangement
radio communication
electrically connected
communication device
Prior art date
Application number
PCT/SE2004/001852
Other languages
French (fr)
Inventor
Ermin Pasalic
Original Assignee
Amc Centurion Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Amc Centurion Ab filed Critical Amc Centurion Ab
Publication of WO2005064742A1 publication Critical patent/WO2005064742A1/en

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08Helical antennas
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use

Definitions

  • the present invention relates generally to an antenna arrangement for a radio communication device. Particularly, the present invention relates to a quarter wavelength guadrifilar helix structure for a portable radio communication device.
  • Radio communication via satellite is a fairly common application today.
  • One type of antenna that is utilized for satellite communication in a portable radio communication device such as a mobile phone or a GPS receiver, is a guadrifilar helix antenna (QHA) .
  • QHA guadrifilar helix antenna
  • Such an antenna provides circularly polarized radiation and may be designed having a half wavelength structure or a quarter wavelength structure with a shorted end. This is more closely described in Mobile Antenna Systems Handbook, chapter 9.6.2.7, by K. Fujimoto and J. R. James.
  • a problem with the half wavelength structure is primarily its length, as there is always a constant desire to provide small products .
  • a problem with the ⁇ quarter wavelength structure compared to the half wavelength structure is that a deteriorated radiation pattern is obtained.
  • Another problem with the quarter wavelength structure is that also the axial ratio and antenna gain deteriorate compared to the half wavelength structure.
  • An object of the present invention is to provide a short antenna structure that mitigates the problems described above.
  • an antenna arrangement for a portable radio communication device such as a mobile, phone or a GPS receiver, comprising a quarter wavelength QHA structure having a shorted end grounded coaxially along the inside of the guadrifilar helix structure
  • a short antenna arrangement is provided that has an axial ratio, antenna gain, and radiation pattern comparable to that of a half wavelength QHA structure .
  • Fig. 1 shows a quarter wavelength guadrifilar helix antenna structure according to a first embodiment of the present invention
  • Fig. 2 illustrates a short-circuit arrangement according to a second embodiment of the present invention
  • Fig. 3 illustrates a short-circuit arrangement according to a third embodiment of the present invention.
  • An antenna arrangement for a portable radio communication device such as a mobile phone or a GPS receiver, comprises a quadrafilar helix antenna (QHA) structure with a short- circuited end having a length of approximately ⁇ /4 of a desired transmission frequency. This will hereinafter be referred to as a quarter wavelength QHA structure.
  • QHA quadrafilar helix antenna
  • the quarter wavelength QHA structure comprises four radiating elements 1, each of which is in a first end electrically connected to a feeding net 4 and in a second end electrically connected to a short-circuit arrangement 2.
  • the short-circuit arrangement 2 is formed as a circle element, onto which periphery the radiating elements 1 are connected to.
  • the antenna arrangement further comprises a grounding 3, preferably a grounding pin, arranged coaxially along the inside of the quarter wavelength QHA structure, electrically connecting the short-circuit arrangement 2 to ground on the feeding net 4.
  • the feeding net 4 will, when the antenna arrangement is mounted in the mobile phone or the GPS receiver, be electrically connected to RF circuitry and ground of the mobile phone or the GPS receiver. Alternatively the grounding may be electrically connected directly to ground of the mobile phone or the GPS receiver, when the antenna arrangement is mounted thereto.
  • the feeding net 4 is arranged to feed the four radiating elements 1 with a phase difference of 90°, to provide a circularly polarized radiation pattern. Due to the coaxial grounding 3 it is possible to achieve very good axial ratio for the radiation pattern. Further, a wide beam width and a stable mechanical construction are achieved, due to the coaxial grounding 3.
  • each radiating element 1 has a length of 50 " mm, the height of the helix structure is 40 mm, and the diameter of the short-circuit arrangement is 10 mm a frequency band of 1525-1660 MHz is obtained.
  • FIG. 2 A second embodiment of the present invention will next be described with reference to Fig. 2. This embodiment is identical to the first embodiment described above, apart from the following.
  • the short-circuit arrangement is formed as two intersecting line elements 10, the ends of which are electrically connected to the second ends of the radiating elements 1.
  • the grounding is electrically connected to the short-circuit arrangement at the intersection 11 of the two line elements 10.
  • the intersection 11 is positioned in the centerline of the quarter wavelength QHA structure.
  • the short-circuit arrangement further comprises an annular element 12 electrically connected to the second ends of the radiating elements 1.
  • This annular element 12 provides more support structure for the antenna arrangement, compared to the second embodiment described above.
  • the antenna arrangement comprises separate transmitting and receiving radiating elements.
  • Each of the transmitting and receiving radiating elements is made up of a quarter wavelength QHA structure according to the first embodiment described above.
  • the two structures are interleaved, and are both electrically connected to the feeding net and to the short-circuit arrangement .
  • both structures are electrically connected to the feeding net, but only one of the transmitting structure and the receiving structure is electrically connected to the short-circuit arrangement.
  • the other one of the transmitting structure and the receiving structure is only capacitively connected to the short-circuit arrangement.

Abstract

The present invention relates to antenna arrangements for portable radio communication devices, such as mobile phones or GPS receivers. The antenna arrangement comprises a quarter wavelength QHA structure. Due to a grounding (3) arranged coaxially along the inside of the structure good performance is achieved, compared to a half wavelength QHA structure.

Description

AN ANTENNA ARRANGEMENT FOR A PORTABLE RADIO COMMUNICATION DE ICE
FIELD OF INVENTION
The present invention relates generally to an antenna arrangement for a radio communication device. Particularly, the present invention relates to a quarter wavelength guadrifilar helix structure for a portable radio communication device.
BACKGROUND
Radio communication via satellite is a fairly common application today. One type of antenna that is utilized for satellite communication in a portable radio communication device, such as a mobile phone or a GPS receiver, is a guadrifilar helix antenna (QHA) . Such an antenna provides circularly polarized radiation and may be designed having a half wavelength structure or a quarter wavelength structure with a shorted end. This is more closely described in Mobile Antenna Systems Handbook, chapter 9.6.2.7, by K. Fujimoto and J. R. James.
A problem with the half wavelength structure is primarily its length, as there is always a constant desire to provide small products . A problem with the quarter wavelength structure compared to the half wavelength structure is that a deteriorated radiation pattern is obtained. Another problem with the quarter wavelength structure is that also the axial ratio and antenna gain deteriorate compared to the half wavelength structure. SUMMARY OF THE INVENTION
An object of the present invention is to provide a short antenna structure that mitigates the problems described above.
This object, among others, is attained by an antenna arrangement according to the appended claims .
By providing an antenna arrangement for a portable radio communication device, such as a mobile, phone or a GPS receiver, comprising a quarter wavelength QHA structure having a shorted end grounded coaxially along the inside of the guadrifilar helix structure, a short antenna arrangement is provided that has an axial ratio, antenna gain, and radiation pattern comparable to that of a half wavelength QHA structure .
Further features and advantages of the present invention will be evident from the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description of embodiments given below and the accompanying figures, which are given by way of illustration only, and thus, are not limitative of the present invention, wherein:
Fig. 1 shows a quarter wavelength guadrifilar helix antenna structure according to a first embodiment of the present invention;
Fig. 2 illustrates a short-circuit arrangement according to a second embodiment of the present invention; and Fig. 3 illustrates a short-circuit arrangement according to a third embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENTS
In the following description, for purpose of explanation and not limitation, specific details are set forth, such as particular techniques and applications in order to provide a thorough understanding of the present invention. However, it will be apparent for a person skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed description of well-known methods and apparatuses are omitted so as not to obscure the description of the present invention with unnecessary details.
A first embodiment of the present invention will now be described with reference to Fig. 1.
An antenna arrangement for a portable radio communication device, such as a mobile phone or a GPS receiver, comprises a quadrafilar helix antenna (QHA) structure with a short- circuited end having a length of approximately λ/4 of a desired transmission frequency. This will hereinafter be referred to as a quarter wavelength QHA structure.
The quarter wavelength QHA structure comprises four radiating elements 1, each of which is in a first end electrically connected to a feeding net 4 and in a second end electrically connected to a short-circuit arrangement 2. The short-circuit arrangement 2 is formed as a circle element, onto which periphery the radiating elements 1 are connected to.
The antenna arrangement further comprises a grounding 3, preferably a grounding pin, arranged coaxially along the inside of the quarter wavelength QHA structure, electrically connecting the short-circuit arrangement 2 to ground on the feeding net 4. The feeding net 4, will, when the antenna arrangement is mounted in the mobile phone or the GPS receiver, be electrically connected to RF circuitry and ground of the mobile phone or the GPS receiver. Alternatively the grounding may be electrically connected directly to ground of the mobile phone or the GPS receiver, when the antenna arrangement is mounted thereto.
The feeding net 4 is arranged to feed the four radiating elements 1 with a phase difference of 90°, to provide a circularly polarized radiation pattern. Due to the coaxial grounding 3 it is possible to achieve very good axial ratio for the radiation pattern. Further, a wide beam width and a stable mechanical construction are achieved, due to the coaxial grounding 3.
Where each radiating element 1 has a length of 50" mm, the height of the helix structure is 40 mm, and the diameter of the short-circuit arrangement is 10 mm a frequency band of 1525-1660 MHz is obtained.
A second embodiment of the present invention will next be described with reference to Fig. 2. This embodiment is identical to the first embodiment described above, apart from the following.
The short-circuit arrangement is formed as two intersecting line elements 10, the ends of which are electrically connected to the second ends of the radiating elements 1. The grounding is electrically connected to the short-circuit arrangement at the intersection 11 of the two line elements 10. The intersection 11 is positioned in the centerline of the quarter wavelength QHA structure. Next a third embodiment of the present invention will be described with reference to Fig. 3. This embodiment is identical to the second embodiment described above, apart from the following.
The short-circuit arrangement further comprises an annular element 12 electrically connected to the second ends of the radiating elements 1. This annular element 12 provides more support structure for the antenna arrangement, compared to the second embodiment described above.
An alternative form for the short-circuit arrangement may be obtained with the annular element 13 without the two intersected line elements 10, but in this case the grounding 3 needs to be extended from the center of the short-circuit arrangement to the annular element 12. However, this may give rise to some non-linearity, in the radiation pattern.
A fourth embodiment of the present invention will now be described.
The antenna arrangement comprises separate transmitting and receiving radiating elements. Each of the transmitting and receiving radiating elements is made up of a quarter wavelength QHA structure according to the first embodiment described above. The two structures are interleaved, and are both electrically connected to the feeding net and to the short-circuit arrangement .
Alternatively, both structures are electrically connected to the feeding net, but only one of the transmitting structure and the receiving structure is electrically connected to the short-circuit arrangement. The other one of the transmitting structure and the receiving structure is only capacitively connected to the short-circuit arrangement. It will be obvious that the present invention may be varied in a plurality of ways. Such variations are not to be regarded as departure from the scope of the present invention. All such variations as would be obvious for a person skilled in the art are intended to be included within the scope of the present invention.

Claims

1. An antenna arrangement for a portable radio communication device, comprising: four radiating elements (1) for forming a quarter wavelength guadrifilar helix structure, wherein each of said radiating elements ( 1 ) is in a first end thereof arranged for electrical connection to RF circuitry of the portable radio communication device, and wherein each of said radiating elements (1) is in a second end opposite to said first end electrically connected to a corresponding second end of the other three radiating elements , thus forming a short circuit arrangement (2) for the four radiating elements ( 1 ) ; characterized by a grounding (3) arranged between said short circuit arrangement (2) and a ground for electrical connection to the portable radio communication device, wherein said grounding (3) is arranged coaxially along the inside of said guadrifilar helix structure.
2. The antenna arrangement as claimed in claim 1, wherein said short circuit arrangement (2) comprises two intersecting line elements (10), the ends of which are electrically connected to said second ends of said radiating elements (1), and wherein said grounding (3) is electrically connected at the intersection (11) of said intersecting line elements (10 ) .
3. The antenna arrangement as claimed in claim 1 or 2, wherein said short circuit arrangement (2) comprises an annular element (12) electrically connected to said second ends of said radiating elements (1).
4. The antenna arrangement as claimed in claim 1, wherein said short circuit arrangement (2) comprises a circle element, in its periphery connected to said second ends of said radiating elements (1).
5. The antenna arrangement as claimed in claim 4r wherein said grounding (3) is electrically connected in the center of said circle element.
6. The antenna arrangement as claimed in any of claims 1-5, comprising a feeding net (4) electrically connected to said first ends of said radiating elements (1).
7. The antenna arrangement as claimed in claim 6, wherein said grounding (3) is electrically connected to a ground portion of said feeding net (4).
8. The antenna arrangement as claimed in any of claims 1-7, comprising another set of four radiating elements r positioned parallel to the first set of four radiating elements (1) , to provide an antenna arrangement with separated transmission and receiving antenna elements.
9. The antenna arrangement as claimed in claim 8, wherein each of the first ends of said second set of four radiating elements is arranged for electrical connection to RF circuitry of the portable radio communication device, and each of the second ends of said second set of four radiating elements is electrically connected to said short-circuit arrangement.
10. The antenna arrangement as claimed in claim 8, wherein each of the first ends of said second set of four radiating elements is arranged for electrical connection to RF circuitry of the portable radio communication device, and each of the second ends of .said second set of four radiating elements is capacitively connected to said short circuit arrangement ( 2 ) .
11. A portable radio communication device comprising an antenna arrangement as claimed in any previous claim.
PCT/SE2004/001852 2003-12-29 2004-12-13 An antenna arrangement for a portable radio communication device WO2005064742A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0303547-4 2003-12-29
SE0303547A SE526210C2 (en) 2003-12-29 2003-12-29 Antenna device for a portable radio communication device

Publications (1)

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WO2005064742A1 true WO2005064742A1 (en) 2005-07-14

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PCT/SE2004/001852 WO2005064742A1 (en) 2003-12-29 2004-12-13 An antenna arrangement for a portable radio communication device

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WO (1) WO2005064742A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100873433B1 (en) * 2005-10-07 2008-12-11 이성철 4-Axial Cross Antena and Manufacturing Method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996018220A1 (en) * 1994-12-06 1996-06-13 Deltec New Zealand Limited A helical antenna
EP0896385A1 (en) * 1996-04-25 1999-02-10 Kyocera Corporation Composite antenna
US5909196A (en) * 1996-12-20 1999-06-01 Ericsson Inc. Dual frequency band quadrifilar helix antenna systems and methods
US6011524A (en) * 1994-05-24 2000-01-04 Trimble Navigation Limited Integrated antenna system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6011524A (en) * 1994-05-24 2000-01-04 Trimble Navigation Limited Integrated antenna system
WO1996018220A1 (en) * 1994-12-06 1996-06-13 Deltec New Zealand Limited A helical antenna
EP0896385A1 (en) * 1996-04-25 1999-02-10 Kyocera Corporation Composite antenna
US5909196A (en) * 1996-12-20 1999-06-01 Ericsson Inc. Dual frequency band quadrifilar helix antenna systems and methods

Also Published As

Publication number Publication date
SE0303547L (en) 2005-06-30
SE526210C2 (en) 2005-07-26
KR20050069850A (en) 2005-07-05
KR100581442B1 (en) 2006-05-23
SE0303547D0 (en) 2003-12-29

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