WO2022190307A1 - Dispositif d'évaluation d'antenne - Google Patents

Dispositif d'évaluation d'antenne Download PDF

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Publication number
WO2022190307A1
WO2022190307A1 PCT/JP2021/009715 JP2021009715W WO2022190307A1 WO 2022190307 A1 WO2022190307 A1 WO 2022190307A1 JP 2021009715 W JP2021009715 W JP 2021009715W WO 2022190307 A1 WO2022190307 A1 WO 2022190307A1
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WIPO (PCT)
Prior art keywords
antenna
radio wave
scatterer
position calculation
wave scatterer
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PCT/JP2021/009715
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English (en)
Japanese (ja)
Inventor
拓朗 間宮
孝行 中西
道生 瀧川
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2023505004A priority Critical patent/JP7258268B2/ja
Priority to PCT/JP2021/009715 priority patent/WO2022190307A1/fr
Publication of WO2022190307A1 publication Critical patent/WO2022190307A1/fr

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    • 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

Definitions

  • the present disclosure relates to an antenna evaluation device.
  • the radio waves received by the receiving antenna are generated not only by the radio waves that propagate directly from the transmitting antenna to the receiving antenna, but also by the radio waves transmitted by the transmitting antenna being scattered by obstacles such as buildings. It also includes scattered waves that have reached
  • the antenna evaluation apparatus reproduces such a multipath environment and evaluates the reception performance of the antenna.
  • Patent Document 1 describes an antenna evaluation device that evaluates the reception performance of a mobile terminal antenna.
  • the antenna evaluation apparatus a plurality of transmitting antennas are installed around an antenna to be evaluated (hereinafter referred to as an antenna to be evaluated).
  • the antenna evaluation apparatus reproduces a multipath environment by transmitting radio waves from each of the plurality of transmitting antennas to the antenna to be evaluated.
  • multiple transmitting antennas are used to reproduce the multipath environment.
  • a circuit such as an attenuator or a phase shifter is required for each transmission antenna, and there is a problem that the transmission circuit becomes large-scaled and complicated.
  • the present disclosure has been made to solve the above problems, and aims at a technology that can reproduce a multipath environment without using multiple transmitting antennas.
  • An antenna evaluation apparatus for evaluating the reception performance of an antenna to be evaluated, which includes a single transmitting antenna that transmits radio waves and each of which scatters the radio waves transmitted by the transmitting antennas. a plurality of radio wave scatterers that generate scattered waves by means of a vibration, and a single antenna to be evaluated that receives the scattered waves generated by the plurality of radio wave scatterers, and the transmitting antenna and the antenna to be evaluated are arranged side by side
  • the first condition is that the current direction of the transmitting antenna is the same as the current direction of the transmitting antenna, or a radio wave absorber that absorbs the radio waves transmitted by the transmitting antenna is installed between the transmitting antenna and the antenna to be evaluated. At least one of the second conditions is satisfied.
  • a multipath environment can be reproduced without using multiple transmitting antennas.
  • FIG. 1 is a schematic diagram showing the configuration of an antenna evaluation device according to Embodiment 1;
  • FIG. 4 is a diagram showing the relationship between the direction in which the transmitting antenna and the antenna to be evaluated are arranged and the direction of current flowing through the transmitting antenna according to Embodiment 1.
  • FIG. 2 is an enlarged view of a transmitting antenna and an antenna to be evaluated according to Embodiment 1;
  • FIG. FIG. 2 is a cross-sectional view taken along a plane indicated by a dotted line AA in FIG. 1;
  • FIG. 5 is an enlarged view enlarging the range indicated by the dotted line BB in FIG. 4;
  • 1 is a top view of the antenna evaluation device according to Embodiment 1;
  • FIG. 2 is a schematic diagram showing the configuration of an antenna evaluation device according to Embodiment 2;
  • FIG. FIG. 11 is a schematic diagram showing the configuration of an antenna evaluation device according to Embodiment 3;
  • 10 is a flow chart showing a radio wave scatterer position calculation method by the radio wave scatterer position calculation device according to Embodiment 3.
  • FIG. FIG. 10 is a flowchart showing details of step ST6 shown in FIG. 9;
  • FIG. FIG. 10 shows an image diagram of a trajectory for arranging radio wave scatterers in step ST10 shown in FIG. 12A is a block diagram showing a hardware configuration that implements the function of the position calculation unit of the radio wave scatterer position calculation device in the antenna evaluation device according to Embodiment 3.
  • FIG. 12B is a block diagram showing a hardware configuration for executing software that implements the function of the position calculation unit of the radio wave scatterer position calculation device in the antenna evaluation device according to Embodiment 3.
  • FIG. FIG. 11 is a schematic diagram showing the configuration of an antenna evaluation device according to Embodiment 4;
  • FIG. 11 is an enlarged view of the periphery of a first driving unit included in the antenna evaluation device according to Embodiment 4;
  • FIG. 11 is a schematic diagram showing the configuration of an antenna evaluation device according to Embodiment 5;
  • FIG. 1 is a schematic diagram showing the configuration of an antenna evaluation apparatus 100 according to Embodiment 1.
  • the antenna evaluation apparatus 100 includes a single transmitting antenna 1a, a single antenna to be evaluated 1b, a plurality of radio wave scatterers 2, a plurality of supports 3, a plurality of supports 4, and a first cable. 5 a , a second cable 5 b , an oscillator 6 and a signal measuring device 7 .
  • the transmitting antenna 1a and the antenna to be evaluated 1b are installed side by side in a direction perpendicular to the ground. More specifically, in Embodiment 1, the transmitting antenna 1a is installed at a position farther from the ground than the position where the antenna to be evaluated 1b is installed. The transmitting antenna 1a may be installed at a position closer to the ground than the position where the antenna to be evaluated 1b is installed. Examples of the transmitting antenna 1a and the antenna to be evaluated 1b include a dipole antenna, a linear antenna such as a sleeve antenna, and the like.
  • the support 4 is rod-shaped and installed so that its longitudinal direction is perpendicular to the ground. More specifically, in Embodiment 1, the plurality of columns 4 are installed around the transmitting antenna 1a and the antenna to be evaluated 1b so as to surround the transmitting antenna 1a and the antenna to be evaluated 1b. In order not to affect the evaluation of the antenna 1b to be evaluated, the support 4 should be made of a resin such as vinyl chloride or polypropylene because it is necessary to minimize radio wave scattering.
  • the number of struts 4 is the minimum number required to satisfy the arrangement condition of the radio wave scatterers 2 for reproducing the multipath environment. That is, the number of supports 4 is set according to the number of radio wave scatterers 2 and the arrangement of the radio wave scatterers 2 .
  • the support part 3 is rod-shaped, one end of which is supported by the column 4 and the other end of which supports the radio wave scattering body 2 . That is, the number of supporting portions 3 is one for one radio wave scattering body 2 . Moreover, the support part 3 is installed so that a longitudinal direction may become a direction parallel to the ground. In order not to affect the evaluation of the antenna to be evaluated 1b, the supporting part 3 should be made of a resin such as vinyl chloride or polypropylene because it is necessary to minimize radio wave scattering.
  • Embodiment 1 three support parts 3 are installed on the support columns 4 per 41 support columns.
  • the three radio wave scatterers 2 supported by the three support portions 3 face the transmitting antenna 1a and the evaluated antenna 1b, respectively.
  • a plurality of radio wave scatterers 2 each supported by a corresponding support portion 3 surround the transmitting antenna 1a and the antenna to be evaluated 1b.
  • the number of radio wave scatterers 2 provided in the antenna evaluation device 100 is the same as the number of scattered waves in the reproduced multipath environment. Further, in the method of reproducing a multipath environment by the antenna evaluation apparatus 100 according to Embodiment 1, by using the horizontal plane angle and the vertical plane angle based on the position of the transmitting antenna 1a or the position of the antenna to be evaluated 1b, radio waves The position coordinates of the scatterer 2 are shown. The position of the radio wave scatterer 2 indicated by the horizontal plane angle and the vertical plane angle is set according to the arrival angle of the scattered waves to be received by the evaluated antenna 1b in the reproduced multipath environment.
  • the radio wave scatterer 2 is not particularly limited in shape and material as long as it has the property of scattering radio waves radiated from the transmitting antenna 1a.
  • the radio wave scatterer 2 is a metal conductor plate or the like.
  • a first cable 5 a connects the transmitting antenna 1 a and the oscillator 6 .
  • a second cable 5 b connects the antenna under evaluation 1 b and the signal measuring device 7 .
  • the oscillator 6 generates a signal of a predetermined frequency in order to reproduce radio waves of a predetermined frequency in a multipath environment.
  • a first cable 5a transmits the signal generated by the oscillator 6 to the transmitting antenna 1a.
  • the transmitting antenna 1a transmits radio waves. More specifically, in Embodiment 1, the transmitting antenna 1a transmits radio waves of a predetermined frequency. Note that the predetermined frequency is set according to the multipath environment to be reproduced. More specifically, in Embodiment 1, the transmitting antenna 1a transmits the signal generated by the oscillator 6 as radio waves.
  • Each of the plurality of radio wave scattering bodies 2 generates a scattered wave by scattering the radio wave transmitted by the transmitting antenna 1a.
  • the antenna to be evaluated 1 b receives each scattered wave generated by the plurality of radio wave scattering bodies 2 .
  • the second cable 5b transmits to the signal measuring device 7 a signal obtained by the antenna under evaluation 1b receiving scattered waves.
  • the signal measuring instrument 7 measures the signal obtained by the antenna under evaluation 1b receiving the scattered wave. Also, the signal measuring device 7 evaluates the reception performance of the evaluated antenna 1b based on the measured signal.
  • the type of signal measuring device 7 used differs depending on the necessity of evaluating the reception performance of the antenna 1b to be evaluated.
  • the signal measuring device 7 is a spectrum analyzer, network analyzer, or the like.
  • the antenna evaluation apparatus 100 employs the configuration shown in FIG. FIG. 2 is a diagram showing the relationship between the direction in which the transmitting antenna 1a and the antenna to be evaluated 1b are arranged and the direction of current flowing through the transmitting antenna 1a.
  • the direction in which the transmitting antenna 1a and the antenna to be evaluated 1b are arranged is the same as the current direction of the transmitting antenna 1a.
  • the transmitting antenna 1a when viewed from the antenna 1b to be evaluated becomes electrically minute, and thus there is an effect of suppressing coupling between the antennas.
  • the antenna evaluation apparatus 100 can be made compact.
  • the term "same" means completely the same, approximately the same, or substantially the same.
  • the transmitting antenna 1a and the antenna to be evaluated 1b are arranged so that the longitudinal direction of the transmitting antenna 1a and the longitudinal direction of the antenna to be evaluated 1b are on the same straight line. That is, the direction in which the transmitting antenna 1a and the antenna to be evaluated 1b are arranged here means the direction of the straight line.
  • the current direction of the transmitting antenna 1a described above means the direction of current flowing in the transmitting antenna 1a for transmitting radio waves.
  • the current direction of the transmitting antenna 1a is perpendicular to the ground.
  • the antenna evaluation apparatus 100 employs the configuration shown in FIG. FIG. 3 is an enlarged view of the transmitting antenna 1a and the antenna to be evaluated 1b.
  • a radio wave absorber 10 that absorbs radio waves transmitted by the transmitting antenna 1a is installed between the transmitting antenna 1a and the antenna to be evaluated 1b.
  • the radio wave absorber 10 attenuates the radio wave on the straight path from the transmitting antenna 1a to the antenna to be evaluated 1b, thereby suppressing the coupling between the antennas.
  • the antenna evaluation apparatus 100 can be made compact.
  • the first condition that the direction in which the transmitting antenna 1a and the antenna to be evaluated 1b are arranged is the same as the current direction of the transmitting antenna 1a, and the transmission antenna 1a and the antenna to be evaluated 1b
  • An antenna evaluation apparatus 100 that satisfies both the second condition in which a radio wave absorber 10 for absorbing radio waves transmitted by the transmitting antenna 1a is installed between the two conditions will be described.
  • the antenna evaluation apparatus 100 may satisfy only the first condition, or may satisfy only the second condition. In other words, the antenna evaluation apparatus 100 should be able to suppress the coupling between the antennas by satisfying either the first condition or the second condition.
  • the radio wave absorber 10 is disk-shaped, and the two disk surfaces are perpendicular to the straight line connecting the transmitting antenna 1a and the antenna to be evaluated 1b. is installed as Each radius of the two disk surfaces of the radio wave absorber 10 is equal to or greater than the radius of the first Fresnel zone defined by the straight line distance connecting the transmitting antenna 1a and the antenna to be evaluated 1b.
  • the first Fresnel zone is represented by Equation (1) below.
  • ra indicates the radius of the first Fresnel zone
  • ⁇ indicates the wavelength of the radio wave transmitted by the transmitting antenna 1a
  • d1 indicates the distance from the transmitting antenna 1a to the radio wave absorber 10
  • d2 indicates the distance from the radio wave absorber 10 to the antenna to be evaluated 1b.
  • FIG. 4 is a cross-sectional view taken along the plane indicated by the dotted line AA in FIG.
  • FIG. 5 is an enlarged view enlarging the range indicated by the dotted line BB in FIG.
  • FIG. 6 is a top view of the antenna evaluation apparatus 100 viewed from above.
  • the position of the n-th radio wave scatterer among the plurality of radio wave scatterers 2 is the vertical plane angle ⁇ tn , the horizontal plane angle ⁇ tn and the distance from the position of the transmitting antenna 1a. It is defined by R tn and two kinds of coordinates of vertical plane angle ⁇ rn , horizontal plane angle ⁇ rn and distance R rn with respect to the antenna to be evaluated 1b.
  • a signal of a predetermined frequency generated by the oscillator 6 is radiated as radio waves from the transmitting antenna 1a.
  • a radio wave radiated from the transmitting antenna 1a is scattered by the radio wave scatterer 2 and reaches the evaluated antenna 1b. Since a plurality of radio wave scatterers 2 are arranged, a plurality of scattered waves are received by the antenna 1b to be evaluated. That is, the antenna under evaluation 1b receives multipath waves.
  • the signal received by the antenna under evaluation 1b is measured by the signal measuring device 7.
  • the power Pn of the scattered wave generated by the n -th radio wave scatterer 2 and received by the antenna under evaluation 1b is expressed by the following equation (2).
  • P t indicates the transmission power of the transmission antenna 1a
  • G t ( ⁇ tn , ⁇ tn ) indicates the radiation gain of the transmission antenna 1a in the directions of ⁇ tn , ⁇ tn
  • ⁇ ( ⁇ tn , ⁇ tn , ⁇ rn , ⁇ rn ) represent scattering cross sections when radio waves incident from the directions of ⁇ tn and ⁇ tn scatter in the directions of ⁇ rn and ⁇ rn in the radio wave scatterer 2 .
  • the antenna evaluation apparatus 100 is an antenna evaluation apparatus 100 for evaluating the receiving performance of the antenna under evaluation 1b, and includes a single transmitting antenna 1a for transmitting radio waves, and However, there are a plurality of radio wave scatterers 2 that generate scattered waves by scattering the radio waves transmitted by the transmitting antenna, and a single evaluated antenna 1b that receives the scattered waves generated by the plurality of radio wave scatterers 2.
  • the direction in which the transmitting antenna 1a and the antenna to be evaluated 1b are aligned is the same as the direction of current in the transmitting antenna 1a, or between the transmitting antenna 1a and the antenna to be evaluated 1b
  • at least one condition of the second condition that the radio wave absorber 10 for absorbing the radio waves transmitted by the transmitting antenna 1a is installed is satisfied. According to the above configuration, a multipath environment can be reproduced without using a plurality of transmitting antennas by generating scattered waves from each of the plurality of radio wave scattering bodies 2 .
  • an Over-the-Air device (for example, the antenna evaluation device described in Patent Document 1) is used that reproduces an actual communication environment in an anechoic chamber and evaluates antenna performance.
  • An OTA device is a device that reproduces a multipath environment in an anechoic chamber.
  • the amplitude of the elementary wave one radio wave forming the multipath
  • power loss also occurs in the phase shifter.
  • the magnitude of the power loss is calculated based on the performance of the parts used, but in reality errors occur due to individual differences, temperature changes, and the like. In a large and complicated transmission circuit using multiple transmit antennas, it is difficult to know and calibrate the exact power loss due to all attenuators and phase shifters.
  • Embodiment 2 In Embodiment 1, the configuration for generating scattered waves by using the radio wave scatterer 2 has been described. Embodiment 2 will describe a configuration in which the amplitude of each scattered wave is controlled by a radio wave scatterer in order to reproduce a more detailed multipath environment and perform antenna evaluation in the reproduced multipath environment.
  • FIG. 7 is a schematic diagram showing the configuration of antenna evaluation apparatus 101 according to Embodiment 2. As shown in FIG. As shown in FIG. 7, the antenna evaluation apparatus 101 includes a plurality of radio wave scattering bodies 2a, 2b, 2c, 2d, 2e, and 2f instead of the plurality of radio wave scattering bodies 2 described in the first embodiment. .
  • Each of the plurality of radio wave scatterers 2a, 2b, 2c, 2d, 2e, and 2f has a scattering characteristic corresponding to a predetermined amplitude so as to generate scattered waves with a predetermined amplitude.
  • a scattered wave with a predetermined amplitude here is set according to the multipath environment to be reproduced.
  • a plurality of radio wave scatterers are changed to those having known scattering characteristics, and each scattered wave is to control the amplitude of
  • the power Pn is represented by the following formula (3).
  • equation (3) symbols other than ⁇ n ( ⁇ tn , ⁇ tn , ⁇ rn , ⁇ rn ) are the same as those explained in the first embodiment.
  • ⁇ n ( ⁇ tn , ⁇ tn , ⁇ rn , ⁇ rn ) is the scattering when radio waves incident from the directions of ⁇ tn and ⁇ tn are scattered in the directions of ⁇ rn and ⁇ rn in the n-th radio wave scatterer. indicates the cross-sectional area.
  • each of the plurality of radio wave scatterers 2a, 2b, 2c, 2d, 2e, and 2f in the antenna evaluation apparatus 101 according to the second embodiment generates scattered waves of a predetermined amplitude.
  • the antenna to be evaluated 1b it is possible to cause the antenna to be evaluated 1b to receive scattered waves of a predetermined amplitude. That is, it is possible to reproduce a multipath environment composed of scattered waves of a predetermined amplitude. Thereby, antenna evaluation can be preferably performed.
  • Embodiment 3 As a method for controlling the amplitude of scattered waves, the configuration of changing the radio wave scatterer to one having different scattering characteristics according to the desired amplitude of the scattered waves has been described. In Embodiment 3, a configuration will be described in which the arrangement position of the radio wave scatterer is determined in order to adjust the position of the radio wave scatterer and control the amplitude of the scattered wave.
  • FIG. 8 is a schematic diagram showing the configuration of antenna evaluation apparatus 102 according to the third embodiment.
  • the antenna evaluation device 102 further includes a radio wave scatterer position calculation device 20 in addition to the configuration of the antenna evaluation device 101 according to the second embodiment.
  • the radio wave scatterer position calculation device 20 includes a position calculation section 21 and a storage section 22 .
  • the configuration in which the antenna evaluation device 102 includes the radio wave scatterer position calculation device 20 will be described, but the radio wave scatterer position calculation device 20 may be used independently.
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 causes the radio wave scatterer 2 to generate scattered waves with a predetermined amplitude, and the scattered waves arrive at the evaluated antenna 1b at a predetermined arrival angle.
  • An arrangement position where the radio wave scatterer 2 is arranged is calculated for each radio wave scatterer 2 .
  • the scattered wave with a predetermined amplitude here is set according to the multipath environment to be reproduced.
  • the predetermined arrival angle here is set according to the multipath environment to be reproduced.
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 calculates the predetermined amplitude, the predetermined arrival angle, the position of the transmission antenna 1a, the radiation directivity pattern of the transmission antenna 1a, the scattering characteristics of the radio wave scatterer 2, and the Based on the position of the evaluation antenna 1b, the placement position of the radio wave scatterer 2 is calculated.
  • the position of the transmitting antenna 1a, the radiation directivity pattern of the transmitting antenna 1a, the scattering characteristics of the radio wave scatterer 2, and the position of the antenna to be evaluated 1b are information related to the specifications of the antenna evaluation device 102. In form 3, it is assumed to be predetermined.
  • the storage unit 22 of the radio wave scatterer position calculation device 20 stores the predetermined amplitude used by the position calculation unit 21, the predetermined arrival angle, the position of the transmission antenna 1a, the radiation directivity pattern of the transmission antenna 1a, the scattering characteristics of the radio wave scatterer 2. and the position of the antenna to be evaluated 1b.
  • FIG. 9 is a flowchart showing a method for calculating the position of radio wave scatterers by the radio wave scatterer position calculation device 20 according to the third embodiment.
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 reads the position information regarding the position of the transmitting antenna 1a and the position of the evaluated antenna 1b from the storage unit 22 (step ST1). Next, the position calculation unit 21 of the radio wave scatterer position calculation device 20 reads information on the radiation directivity pattern of the transmission antenna 1a from the storage unit 22 (step ST2).
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 reads information on the scattering characteristics of the radio wave scatterer 2 from the storage unit 22 (step ST3).
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 reads the amplitude and arrival angles ( ⁇ rn , ⁇ rn ) of the scattered waves, which are the conditions of the desired multipath environment, from the storage unit 22 (step ST4). ).
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 calculates the arrangement position (angle) of the radio wave scatterer 2 in the horizontal plane based on the horizontal plane angle ⁇ rn among the arrival angle conditions of the read scattered waves. Determine (step ST5).
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 calculates the amplitude of the scattered wave read and the angle of the vertical plane out of the arrival angle of the read scattered wave.
  • a three-dimensional arrangement position of the scatterer 2 is determined (step ST6).
  • FIG. 10 is a flow chart showing details of step ST6 shown in FIG.
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 calculates the trajectory of the radio wave scatterer 2 based on the arrival angle ⁇ rn of the vertical plane read from the storage unit 22 (step ST10).
  • FIG. 11 shows an image diagram of the trajectory for arranging the radio wave scattering bodies 2 in step ST10 shown in FIG.
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 calculates the three-dimensional position of the radio wave scatterer 2 based on the amplitude conditions of the scattered waves read from the storage unit 22 by the following steps ST11 to ST18. decide.
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 sets the placement position of the n-th radio wave scatterer 2 to an arbitrary position on the orbit (step ST11). In other words, it is assumed that the position calculation unit 21 of the radio wave scatterer position calculation device 20 arranges the n-th radio wave scatterer 2 at an arbitrary position on the orbit. Then, the position calculator 21 of the radio wave scatterer position calculator 20 obtains the following five values (i), (ii), (iii), (iv), and (v).
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 calculates (i) the n-th radio wave scattering as viewed from the transmitting antenna 1a based on the set position of the n-th radio wave scatterer 2. Obtain the arrangement angles ( ⁇ tn , ⁇ tn ) of the body 2 (step ST12)
  • step ST12 the position calculation unit 21 of the radio wave scatterer position calculation device 20 performs (ii ) Obtain the radiation gain G t ( ⁇ tn , ⁇ tn ) of the transmitting antenna (step ST13).
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 obtains (i), the scattering characteristics of the radio wave scatterer 2 read from the storage unit 22, and the arrival angle conditions of the scattered waves ( (iii)
  • the scattering cross-section ⁇ n ( ⁇ tn , ⁇ tn , ⁇ rn , ⁇ rn ) of the n-th radio wave scatterer 2 is obtained based on ⁇ rn , ⁇ rn ) (step ST14).
  • step ST11 the position calculation unit 21 of the radio wave scatterer position calculation device 20, based on the set position of the n-th radio wave scatterer 2 and the position of the transmitting antenna 1a read from the storage unit 22, (iv) find the distance Rtn from the transmitting antenna 1a to the n-th radio wave scatterer 2 (step ST15).
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 determines the set position of the n-th radio wave scatterer 2 and the position of the evaluated antenna 1b read from the storage unit 22. Based on this, (v) the distance R rn from the antenna under evaluation 1b to the n-th radio wave scattering object 2 is obtained (step ST16).
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 calculates the transmission power P t and each of the above values (ii to v) as described above. (3), the power Pn of the scattered wave generated by the n-th radio wave scatterer 2 is calculated, and the amplitude ⁇ Pn is obtained based on the calculated power (step ST17).
  • the transmission power Pt here is the transmission power of the transmission antenna 1a, and is set in advance.
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 determines whether the obtained amplitude ⁇ Pn matches the amplitude of the scattered wave read from the storage unit 22 (the amplitude of the desired scattered wave condition). is determined (step ST18).
  • the arrangement position on the orbit set in step ST11 is determined as the three-dimensional arrangement position of the n-th radio wave scatterer 2 .
  • step ST18 NO the position calculation unit 21 of the radio wave scatterer position calculation device 20 (step ST11), the n-th radio wave scatterer 2 is rearranged at another position on the orbit, and each process from step ST12 to step ST18 is performed again.
  • the position calculation unit 21 of the radio wave scatterer position calculation device 20 determines the arrangement position of each of the plurality of radio wave scatterers 2 by performing the above processing for each radio wave scatterer 2 .
  • the arrangement position of the radio wave scatterer 2 determined by the position calculation unit 21 of the radio wave scatterer position calculation device 20 may be displayed by a display device (not shown). Thereby, the user can place the radio wave scatterer 2 at the placement position determined by the position calculation unit 21 of the radio wave scatterer position calculation device 20 .
  • Each function of the position calculation unit 21 of the radio wave scatterer position calculation device 20 in the antenna evaluation device 102 is realized by a processing circuit. That is, the antenna evaluation device 102 includes a processing circuit for executing the processing of each step shown in FIGS. 9 and 10.
  • FIG. This processing circuit may be dedicated hardware, or may be a CPU (Central Processing Unit) that executes a program stored in memory.
  • CPU Central Processing Unit
  • FIG. 12A is a block diagram showing a hardware configuration that realizes the function of the position calculation unit 21 of the radio wave scatterer position calculation device 20 in the antenna evaluation device 102.
  • FIG. 12B is a block diagram showing a hardware configuration for executing software that implements the function of the position calculation unit 21 of the radio wave scatterer position calculation device 20 in the antenna evaluation device 102. As shown in FIG.
  • the processing circuit 23 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), or a combination thereof.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field-Programmable Gate Array
  • Each function of the position calculation unit 21 of the radio wave scatterer position calculation device 20 in the antenna evaluation device 102 may be realized by separate processing circuits, or these functions may be collectively realized by one processing circuit.
  • each function of the position calculation unit 21 of the radio wave scatterer position calculation device 20 in the antenna evaluation device 102 is realized by software, firmware, or a combination of software and firmware. .
  • Software or firmware is written as a program and stored in the memory 25 .
  • the processor 24 implements each function of the position calculation unit 21 of the radio wave scatterer position calculation device 20 in the antenna evaluation device 102 by reading and executing the program stored in the memory 25 . That is, when the processor 24 executes these functions, the position calculation unit 21 of the radio wave scatterer position calculation device 20 in the antenna evaluation device 102 performs the processing of each step shown in FIGS. a memory 25 for storing programs to be executed in the
  • the memory 25 may be a computer-readable storage medium storing a program for causing a computer to function as the position calculation unit 21 of the radio wave scatterer position calculation device 20 in the antenna evaluation device 102 .
  • the processor 24 corresponds to, for example, a CPU (Central Processing Unit), a processing device, an arithmetic device, a processor, a microprocessor, a microcomputer, or a DSP (Digital Signal Processor).
  • a CPU Central Processing Unit
  • a processing device for example, a central processing unit (CPU)
  • arithmetic device for example, a central processing unit (CPU)
  • a processor for example, a central processing Unit
  • a microprocessor a microcomputer
  • DSP Digital Signal Processor
  • the memory 25 includes, for example, non-volatile or volatile semiconductor memories such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically-EPROM), Magnetic disks such as hard disks and flexible disks, flexible disks, optical disks, compact disks, mini-disks, CDs (Compact Discs), DVDs (Digital Versatile Discs), and the like are applicable.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • flash memory EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically-EPROM), Magnetic disks such as hard disks and flexible disks, flexible disks, optical disks, compact disks, mini-disks, CDs (Compact Discs), DVDs (Digital Versatile Discs), and the like are applicable.
  • EPROM Erasable Programmable Read Only Memory
  • EEPROM Electrically-EPROM
  • Magnetic disks such as hard disks and flexible disk
  • a part of each function of the position calculation unit 21 of the radio wave scatterer position calculation device 20 in the antenna evaluation device 102 may be realized by dedicated hardware, and a part may be realized by software or firmware.
  • the function of the signal measuring device 7 is realized by a processing circuit as dedicated hardware.
  • the function of the position calculation unit 21 of the radio wave scatterer position calculation device 20 may be realized by the processor 24 reading and executing a program stored in the memory 25 .
  • the processing circuitry may implement each of the above functions in hardware, software, firmware, or a combination thereof.
  • the radio wave scatterer 2 generates scattered waves with a predetermined amplitude, and the scattered waves arrive at the evaluated antenna 1b at a predetermined arrival angle.
  • the radio wave scatterer position calculation device 20 for calculating the arrangement position of the radio wave scatterer 2 for each radio wave scatterer, wherein the predetermined amplitude, the predetermined arrival angle, the position of the transmission antenna 1a, the transmission A radio wave scatterer position calculation device 20 is further provided for calculating the arrangement position of the radio wave scatterer 2 based on the radiation directivity pattern of the antenna 1a, the scattering characteristics of the radio wave scatterer 2, and the position of the antenna to be evaluated 1b.
  • the arrangement position of the radio wave scatterer 2 is determined for reproducing a multipath environment composed of scattered waves having a predetermined amplitude and arriving at the antenna 1b to be evaluated at a predetermined arrival angle. be able to.
  • the multipath environment can be reproduced by arranging the radio wave scattering bodies 2 based on the arrangement positions.
  • determination of the arrangement position of the radio wave scatterer 2 can be automated.
  • Embodiment 4 determination of the arrangement position of the radio wave scatterer 2 is automated by the radio wave scatterer position calculation device 20 .
  • Embodiment 4 describes a configuration in which the radio wave scattering body 2 is moved by a drive unit.
  • FIG. 13 is a schematic diagram showing the configuration of antenna evaluation apparatus 103 according to the fourth embodiment.
  • the antenna evaluation device 103 includes a plurality of first driving units 30 in addition to the configuration of the antenna evaluation device 102 described in the third embodiment.
  • the first drive section 30 is installed at the joint between the support section 3 and the column 4. As shown in FIG. Also, the first drive unit 30 is connected to the radio wave scatterer position calculation device 20 via a third cable 5c.
  • FIG. 14 is an enlarged view of the periphery of the first drive unit 30 provided in the antenna evaluation device 103 according to the fourth embodiment.
  • the drawing on the left side of FIG. 14 shows a side view around the first driving section 30 .
  • the diagram on the right side of FIG. 14 is a perspective view around the first drive unit 30 .
  • the first drive section 30 moves the support section 3 along the longitudinal direction of the support 4 based on the arrangement position calculated by the radio wave scatterer position calculation device 20, or moves the support section 3 along the longitudinal direction of the support section 3.
  • the radio wave scatterer 2 is moved by moving the supporting portion 3 with the
  • the first drive unit 30 moves the support part 3 along the longitudinal direction of the support part 3 based on the arrangement position of the radio wave scatterer 2 calculated by the radio wave scatterer position calculation device 20, thereby Adjust the distance between the scatterer 2 and the support 4 .
  • the first drive section 30 adjusts the height from the ground to the radio wave scattering body 2 by moving the support section 3 along the longitudinal direction of the column 4 .
  • the support part 3 is moved along the longitudinal direction of the support 4, or the support part 3 is moved along the longitudinal direction.
  • the first drive section 30 that moves the radio wave scattering body 2 by moving the support section 3 using the first driving section 30 has been described.
  • the antenna evaluation device 103 only needs to include a drive unit that moves the radio wave scatterer 2 based on the arrangement position calculated by the radio wave scatterer position calculation device 20, and the drive unit is the first It is not limited to the drive unit 30.
  • the antenna evaluation apparatus 103 moves the support section 3 along the longitudinal direction of the support 4 based on the arrangement position calculated by the radio wave scatterer position calculation apparatus 20, or , and a first driving unit 30 for moving the radio wave scatterer 2 by moving the support 3 along the longitudinal direction of the support 3 .
  • the arrangement position of the radio wave scatterer 2 can be automatically changed. Therefore, the multipath environment can be automatically reproduced.
  • Embodiment 5 In the fourth embodiment, the configuration in which the radio wave scattering body 2 is moved by moving the supporting portion 3 by the first driving portion 30 has been described. In Embodiment 5, a configuration in which the radio wave scattering body 2 is moved by moving the support 4 will be described.
  • FIG. 15 is a schematic diagram showing the configuration of antenna evaluation apparatus 104 according to the fifth embodiment.
  • the antenna evaluation device 104 further includes a plurality of second driving units 40 in addition to the configuration of the antenna evaluation device 103 described in the fourth embodiment.
  • the second driving section 40 is installed between the support 4 and the ground. Also, the first drive section 30 and the second drive section 40 are connected to the radio wave scatterer position calculation device 20 via a fourth cable 5d.
  • the second drive unit 40 moves the radio wave scatterer 2 by moving the support 4 along the ground based on the arrangement position calculated by the radio wave scatterer position calculation device 20 .
  • the second driving unit 40 can be used alone, but by using it in combination with the first driving unit 30 as in the antenna evaluation device 104 according to the fifth embodiment, the radio wave scatterer 2 position can be increased.
  • the second drive unit 40 moves the radio wave scatterer 2 by moving the support 4 along the ground based on the arrangement position calculated by the radio wave scatterer position calculation device 20.
  • the antenna evaluation device 104 only needs to include a drive unit that moves the radio wave scatterer 2 based on the arrangement position calculated by the radio wave scatterer position calculation device 20, and the drive unit is the second It is not limited to the drive unit 40.
  • the antenna evaluation device 104 moves the radio wave scatterer 2 by moving the support 4 along the ground based on the arrangement position calculated by the radio wave scatterer position calculation device 20. It further comprises a second drive 40 for movement. According to the above configuration, the arrangement position of the radio wave scatterer 2 can be automatically changed. Therefore, the multipath environment can be automatically reproduced. It should be noted that it is possible to freely combine each embodiment, modify any component of each embodiment, or omit any component from each embodiment.
  • the antenna evaluation apparatus can reproduce a multipath environment without using multiple transmitting antennas, it can be used for techniques for evaluating antennas.

Abstract

Ce dispositif d'évaluation d'antenne (100) satisfait à au moins l'une des conditions suivantes : une première condition selon laquelle le sens dans lequel une antenne d'émission (1a) et une antenne cible d'évaluation (1b) sont placées est identique au sens du courant électrique de l'antenne d'émission (1a) ; et une seconde condition selon laquelle un absorbeur d'ondes radio (10) destiné à absorber des ondes radio émises par l'intermédiaire de l'antenne d'émission (1a) est installé entre l'antenne d'émission (1a) et l'antenne cible d'évaluation (1b).
PCT/JP2021/009715 2021-03-11 2021-03-11 Dispositif d'évaluation d'antenne WO2022190307A1 (fr)

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JP2023505004A JP7258268B2 (ja) 2021-03-11 2021-03-11 アンテナ評価装置
PCT/JP2021/009715 WO2022190307A1 (fr) 2021-03-11 2021-03-11 Dispositif d'évaluation d'antenne

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JPH02120678A (ja) * 1988-10-31 1990-05-08 Toshiba Corp アンテナ効率測定方法
JPH04285868A (ja) * 1991-03-14 1992-10-09 Toshiba Corp アンテナ放射効率測定装置
JP2000180489A (ja) * 1998-12-15 2000-06-30 Ten Kk 簡易形電磁波測定用ボックス
JP2003084023A (ja) * 2001-09-13 2003-03-19 Nec Tokin Corp ランダムフィールド発生方法及び装置
JP2010217062A (ja) * 2009-03-18 2010-09-30 Fujitsu Ltd アンテナ特性評価システム
JP2011061434A (ja) * 2009-09-09 2011-03-24 Ntt Docomo Inc 無線品質評価方法及びシステム
JP2014522497A (ja) * 2011-06-15 2014-09-04 ブリュテスト アクチエボラグ アンテナ、携帯電話及び他の無線端末の性能を測定するための改良された方法と装置
JP2014228338A (ja) * 2013-05-21 2014-12-08 株式会社村田製作所 電波反射箱の等方性評価方法
WO2021049161A1 (fr) * 2019-09-09 2021-03-18 Tdk株式会社 Agitateur électromagnétique et chambre de réflexion

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JP4285868B2 (ja) 2000-01-12 2009-06-24 富士フイルム株式会社 主要被写体抽出方法、画像処理装置および撮像装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02120678A (ja) * 1988-10-31 1990-05-08 Toshiba Corp アンテナ効率測定方法
JPH04285868A (ja) * 1991-03-14 1992-10-09 Toshiba Corp アンテナ放射効率測定装置
JP2000180489A (ja) * 1998-12-15 2000-06-30 Ten Kk 簡易形電磁波測定用ボックス
JP2003084023A (ja) * 2001-09-13 2003-03-19 Nec Tokin Corp ランダムフィールド発生方法及び装置
JP2010217062A (ja) * 2009-03-18 2010-09-30 Fujitsu Ltd アンテナ特性評価システム
JP2011061434A (ja) * 2009-09-09 2011-03-24 Ntt Docomo Inc 無線品質評価方法及びシステム
JP2014522497A (ja) * 2011-06-15 2014-09-04 ブリュテスト アクチエボラグ アンテナ、携帯電話及び他の無線端末の性能を測定するための改良された方法と装置
JP2014228338A (ja) * 2013-05-21 2014-12-08 株式会社村田製作所 電波反射箱の等方性評価方法
WO2021049161A1 (fr) * 2019-09-09 2021-03-18 Tdk株式会社 Agitateur électromagnétique et chambre de réflexion

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