WO2006135322A1 - Procede de mesure de rendement d'antenne, et systeme correspondant - Google Patents

Procede de mesure de rendement d'antenne, et systeme correspondant Download PDF

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Publication number
WO2006135322A1
WO2006135322A1 PCT/SE2006/000705 SE2006000705W WO2006135322A1 WO 2006135322 A1 WO2006135322 A1 WO 2006135322A1 SE 2006000705 W SE2006000705 W SE 2006000705W WO 2006135322 A1 WO2006135322 A1 WO 2006135322A1
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WO
WIPO (PCT)
Prior art keywords
complex
antenna
values
frequencies
circle
Prior art date
Application number
PCT/SE2006/000705
Other languages
English (en)
Inventor
Ermin Pasalic
Andrei Kaikkonen
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 WO2006135322A1 publication Critical patent/WO2006135322A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/10—Radiation diagrams of antennas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/10—Radiation diagrams of antennas
    • G01R29/105—Radiation diagrams of antennas using anechoic chambers; Chambers or open field sites used therefor

Definitions

  • the present invention generally relates to antenna efficiency measurement methods. Particularly the present invention relates to an antenna efficiency measurement method for an electrically small multi band antenna, as well as a system used for performing such an antenna efficiency measurement method.
  • Design of antennas is a complex process, as there are many different parameters to consider in achieving a desired characteristic of the antenna.
  • Antenna efficiency is an important parameter considered during design for all antennas .
  • An object of the present invention is to provide an antenna efficiency measurement method and system, respectively, that works well for a plurality of different antennas utilizing low cost equipment. This object, among others, is attained by a method and a system, respectively, for determining antenna efficiency for an electrically small multi band antenna according to the appended claims.
  • Antenna efficiency can be accurately determined for various types of small antennas, and particularly for various frequencies, due to use of plotted outermost values, which then are fitted to a circle.
  • the inventive method can be performed by utilization of a storage means, a vector network analyzer (VNA), and a cavity having a movable wall.
  • VNA vector network analyzer
  • Fig. 1 illustrates a complex S 11 parameter plotted for one frequency for an electrically small multi band antenna, according to the present invention
  • Fig. 2 schematically illustrates determination of ⁇ S ⁇ x and ⁇ S MIN values according to the present invention
  • Fig. 3 schematically illustrates a setup used for performing the method according to the present invention.
  • Fig. 4 schematically illustrates a cross-section of a cavity with a movable wall .
  • the antenna efficiency for an electrically small multi band antenna i.e. an antenna having its largest dimension smaller than ⁇ /4 of the desired resonance frequencies, typically one used in a portable radio communication device, such as a mobile phone, a portable phone, a lap top computer, or similar device such as antennas used for cars or stationary computers, is to be determined.
  • a portable radio communication device such as a mobile phone, a portable phone, a lap top computer, or similar device such as antennas used for cars or stationary computers
  • the antenna is firstly connected to a vector network analyzer (VNA) , through which the S 11 parameter is measured for the antenna in free space.
  • VNA vector network analyzer
  • the S 11 parameter is the input reflection coefficient from the VNA. This is performed for a plurality of frequencies, e.g. 800-2500 MHz or any other desired frequencies, to obtain a plurality of complex S 11(fs values for free space mounting of the antenna.
  • the measured complex values are preferably stored in a storage means, such as the memory in a computer.
  • the antenna 3 is positioned close to the wall opposite the moving wall 2.
  • the wall opposite the moving wall 2 is fixed during measurement, but is removable for mounting of the antenna 3 into the cavity 1.
  • the antenna is preferably mounted in the chassis it is intended to be used in, during measurement, to provide as accurate measurements as possible. Due to use of the cavity 1 of the present invention, the position of the antenna .close to the wall opposite the moving wall is not particularly sensitive regarding measurement accuracy.
  • the VNA is connected to the antenna 3 through two connections 4, 5, through the cavity 1. If the chassis the antenna is mounted on is small, having a largest dimension of about 60 mm, the currents in the connections 4 , 5 may noticeably affect the measurement. However, this can be taken care of by attaching ferrites to the connections 4, 5, to stop those currents from propagating into the cavity 1 and affecting the measurements .
  • a base area of 200x200 mm 2 of the cavity is suitable.
  • the distance d from the antenna to the movable wall is for such frequencies suitably between 100 and 600 mm, achieving a plurality of volumes V(d) between 0.04 and 0.24 m 3 .
  • the propagation path along the distance d is much more important for the measurement compared to the volume V(d), which is why a cavity having only one moving wall is used.
  • the antenna is again connected to the VNA, through which the S 11 parameter now is measured for the antenna arranged inside the cavity. This is performed for a plurality of distances d, for the same plurality of frequencies as for the measurement in free space, to obtain a plurality of complex Su, c (d) values for cavity mounting of the antenna.
  • the measured complex values are preferably stored in the memory in the computer.
  • For accurate determination of antenna efficiency of an antenna covering 800-2500 MHz approximately 50 complex values S 11(C (d) need to be measured for each of the plurality of frequencies. Also, approximately 30-40 frequencies of the frequency interval are measured, for accurate determination of the antenna efficiency for an antenna covering 800-2500 MHz.
  • the imaginary parts of the complex S llfC (d) values are plotted against the real parts of the complex S UfC (d) values, for each frequency of the plurality of frequencies, see Fig. 1.
  • the values are presented in e.g. polar coordinates or in Cartesian coordinates. However, experiments have showed that presentation in Cartesian coordinates gives a more accurate result of.- the antenna efficiency, compared to plotting in polar coordinates .
  • the outermost values are preferably determined as the complex S n , c (d) values farthest from the complex center point thereof, which preferably is determined in the following way.
  • the complex center point of the values is determined in two steps.
  • the real part of the complex center point is determined by dividing with two the highest positive real value added to the highest negative real value,
  • the imaginary part of the complex center point is determined by dividing by two the highest positive imaginary value added to the highest negative imaginary value
  • the outermost values are then numerically fitted, minimizing Root Mean Square Deviation, to a circle, for each frequency of the plurality of frequencies, see Fig. 1.
  • An initial condition for fitting the outermost values to a circle uses the center point determined above as center of the circle.
  • Another initial condition for fitting the outermost values to a circle uses a radius of the circle determined as one quarter of the distance between the highest and lowest real values added to one quarter of the distance between the highest and lowest imaginary values,
  • the antenna efficiency is determined based on the fitted circle and the complex S llrfs value for the antenna in free space, for each frequency of the plurality of frequencies .
  • the antenna total efficiency is preferably determined by the following equation:
  • ⁇ S ⁇ is the maximum distance between the circumference of the circle and the complex S 11/fs value
  • ⁇ S MIN is the minimum distance between the circumference of the circle and the complex S 11/fs value, see Fig. 2.
  • the antenna radiation efficiency is preferably determined by the following equation:
  • ⁇ S m ⁇ is the maximum distance between the circumference of the circle and the complex S llffs value
  • ⁇ S MIN is the minimum distance between the circumference of the circle and the complex S 11/fs value, see Fig. 2.
  • a system according to the present invention is even more accurate than a dedicated measurement room, at least in the long run, as it comprises fewer components and thereby is more stable and mechanically robust.
  • a standard deviation is calculated between the outermost values and the circle, giving an uncertainty factor for AS 1 ⁇ x and ⁇ S MIN .
  • the processing error is than calculated from equations 1 and 2.
  • a third embodiment is preferably utilized when memory storage capacity is limited during calculation of the antenna efficiency. This may be applied to either of the previous embodiments .
  • the present invention has been described as for use for multi band antennas.
  • the multi band covers over 500 MHz, the advantage with the method of the present invention is noticeably evident compared to known methods .
  • An advantage with the system according to the present invention is that each laboratory- space in a plant can have its own measurement system. In this way the development time for a new antenna can be shortened, as the development personal need not wait for access to a common measurement room.

Abstract

L'invention concerne un procédé de détermination du rendement d'antenne, dans le cas d'une antenne multibande électriquement petite, procédé comprenant les étapes suivantes : mesure d'une valeur de paramètre complexe S11,fs de ladite antenne multibande électriquement petite, lorsque cette dernière est agencée dans un espace libre, pour une pluralité de fréquences ; mesure d'une valeur de paramètre complexe S11,c(d) de ladite antenne multibande électriquement petite, lorsque cette dernière est disposée dans une cavité, pour une pluralité de volumes V(d) de ladite cavité, pour ladite pluralité de fréquences ; détermination, pour chaque fréquence de ladite pluralité de fréquences, des valeurs extrêmes desdites valeurs de paramètre complexes S11,c(d), détermination dans laquelle la partie imaginaire des valeurs de paramètre S11,c(d) sont reportées à l'encontre de la partie réelle des valeurs de paramètre S11,c(d) pour ladite pluralité de volumes V(d) de ladite cavité ; adaptation, pour chaque fréquence de ladite pluralité de fréquences, desdites valeurs extrêmes à un cercle ; et détermination, pour chaque fréquence de ladite pluralité de fréquences, du rendement de ladite antenne, sur la base dudit cercle et de ladite valeur de paramètre complexe S11,fs.
PCT/SE2006/000705 2005-06-17 2006-06-14 Procede de mesure de rendement d'antenne, et systeme correspondant WO2006135322A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0501398-2 2005-06-17
SE0501398A SE528829C2 (sv) 2005-06-17 2005-06-17 Antenneffektivitetmätningsmetod och system därför

Publications (1)

Publication Number Publication Date
WO2006135322A1 true WO2006135322A1 (fr) 2006-12-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2006/000705 WO2006135322A1 (fr) 2005-06-17 2006-06-14 Procede de mesure de rendement d'antenne, et systeme correspondant

Country Status (2)

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SE (1) SE528829C2 (fr)
WO (1) WO2006135322A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102176219A (zh) * 2010-12-29 2011-09-07 电子科技大学 漏泄同轴电缆的传输损耗或耦合损耗的计算方法
WO2017211023A1 (fr) * 2016-06-07 2017-12-14 乐视控股（北京）有限公司 Procédé et dispositif de confirmation rapide pour test d'efficacité d'antenne rf en chambre anéchoïque

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0294205A2 (fr) * 1987-06-03 1988-12-07 Tokin Corporation Enceinte sans écho électromagnétique pourvue d'une surface intérieure de réflexion et d'une petite boule, disposée à l'intérieur de l'enceinte, d'absorption des ondes électromagnétiques
US20030008620A1 (en) * 1999-10-28 2003-01-09 Corbett Rowell Field test chamber arrangement
US6563327B1 (en) * 1998-12-07 2003-05-13 Thales Nederland B.V. Test chamber
US20040183547A1 (en) * 2000-03-13 2004-09-23 Per-Simon Kildal Method and an apparatus for measuring the performance of antennas, mobile phones and other wireless terminals
WO2005003795A1 (fr) * 2003-06-30 2005-01-13 Telefonaktiebolaget L M Ericsson Essai d'efficacite de rayonnement d'une antenne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0294205A2 (fr) * 1987-06-03 1988-12-07 Tokin Corporation Enceinte sans écho électromagnétique pourvue d'une surface intérieure de réflexion et d'une petite boule, disposée à l'intérieur de l'enceinte, d'absorption des ondes électromagnétiques
US6563327B1 (en) * 1998-12-07 2003-05-13 Thales Nederland B.V. Test chamber
US20030008620A1 (en) * 1999-10-28 2003-01-09 Corbett Rowell Field test chamber arrangement
US20040183547A1 (en) * 2000-03-13 2004-09-23 Per-Simon Kildal Method and an apparatus for measuring the performance of antennas, mobile phones and other wireless terminals
WO2005003795A1 (fr) * 2003-06-30 2005-01-13 Telefonaktiebolaget L M Ericsson Essai d'efficacite de rayonnement d'une antenne

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102176219A (zh) * 2010-12-29 2011-09-07 电子科技大学 漏泄同轴电缆的传输损耗或耦合损耗的计算方法
CN102176219B (zh) * 2010-12-29 2014-01-22 电子科技大学 漏泄同轴电缆的传输损耗或耦合损耗的计算方法
WO2017211023A1 (fr) * 2016-06-07 2017-12-14 乐视控股（北京）有限公司 Procédé et dispositif de confirmation rapide pour test d'efficacité d'antenne rf en chambre anéchoïque

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SE0501398L (sv) 2006-12-18
SE528829C2 (sv) 2007-02-27

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