JP4645365B2 - Turntable device - Google Patents

Description

  The present invention relates to a turntable device in which an object to be measured such as an electronic device or an antenna is placed facing a measurement antenna, for example, in an anechoic chamber, and more specifically, a wiring such as a high-frequency cable connected to the object to be measured. The present invention relates to a turntable device that can suppress the influence of the measurement object on the measurement result.

  The turntable device is used for installing an object to be measured such as an electronic device or an antenna when measuring an electromagnetic interference of the electronic device or antenna characteristics of the antenna using a measurement antenna. When the object to be measured is installed on the turntable device, the object to be measured is installed on the turntable device via an installation body for height adjustment. The object to be measured on the turntable device is connected to a measuring device or the like installed outside the anechoic chamber via wiring such as a high-frequency cable. At the time of measurement, various measurements are performed on the object to be measured while rotating the turntable device. If the wiring is present in the anechoic chamber as it is, electromagnetic waves are radiated or reflected on the wiring, which may adversely affect the measurement result of the measured object. Therefore, various electromagnetic wave shielding measures are taken for the wiring connecting the object to be measured on the turntable device and the measuring equipment outside the anechoic chamber.

  For example, Patent Document 1 proposes an anechoic chamber facility provided with an electromagnetic shielding chamber independent of the anechoic chamber. As shown in FIG. 5, the anechoic chamber equipment includes an anechoic chamber 101 with an electromagnetic wave shield for performing a test and measurement including the opposite device B connected to the EUT A, and an electromagnetic wave shield for housing the opposite device B. The chamber 102 is provided independently of the anechoic chamber 101 that houses the EUT A, and has at least one passage 103 through which the line C connecting the EUT A and the opposite device B is connected. The structure is such that the outside is shielded against electromagnetic waves, and the shield 104 is provided in the connection passage 103 as at least one electromagnetic wave shielding structure. The turntable 105 is provided on the floor surface of the anechoic chamber 101 and is rotationally driven by a support drive mechanism 107 installed in the cable storage pit 106. The anechoic chamber 101, the electromagnetic shielding chamber 102, and the connection passage 103 all have an electromagnetic shielding structure by the electromagnetic shielding material 108. By appropriately changing the degree of shielding between the anechoic chamber 103 and the electromagnetic shielding chamber 104 by the shield 104 from this structure, the influence of the opposite device B is minimized in this type of measurement and test, and the test that is originally required Only the machine A can be evaluated with high accuracy. In FIG. 5, reference numeral 109 denotes a radio wave absorber.

  Further, Patent Document 2 proposes a turntable device that improves the reliability of electromagnetic wave measurement results. In this technique, a radio wave absorber 202 is disposed on the upper surface of a turntable 201 that is a turntable. A positioning and fixing hole 202A is provided on the bottom surface of the radio wave absorber 202, and a positioning projection 203 that fits in the positioning and fixing hole 202A is provided on the top surface of the turntable 201, respectively. By fitting the positioning and fixing projection 203 into the positioning and fixing hole 202A, the radio wave absorber 202 is fixed on the turntable 201, and when the turntable 201 rotates, the radio wave absorber 202 is displaced from the initial position. To improve measurement accuracy. In FIG. 6, reference numeral 204 denotes a height adjustment base when installing the measurement object, and 205 denotes a rotation drive mechanism.

Japanese Patent No. 2952168 JP 2004-239768 A

  However, in the technique described in Patent Document 1, an electromagnetic shielding chamber 102 is provided below the turntable 105, that is, below the anechoic chamber 101, and the line C is accommodated in the electromagnetic shielding chamber 102 and the connection passage 103 having an electromagnetic shielding structure. Therefore, the line C does not affect the measurement result of the test equipment A. However, when the anechoic chamber 101 is newly installed or added, the floor of the anechoic chamber 101 is provided to provide the electromagnetic shielding chamber 102. If the anechoic chamber 101 is installed on the second floor or higher, an electromagnetic shielding chamber 102 and a connection passage 103 are newly installed below the anechoic chamber 101 due to floor structure restrictions. Or it cannot be added.

  In the technique described in Patent Document 2, the radio wave absorber 202 is installed on the upper surface of the turntable 201, and the positioning and fixing protrusion 203 provided on the turntable 201 is replaced with the positioning and fixing hole 202 </ b> A of the radio wave absorber 202. Although the electromagnetic wave absorber 202 is fitted in the position to prevent the position shift at the time of rotation, the wiring of the object to be measured is drawn from the height adjustment base 204 to the connection portion of the rotary base 201. Shielding measures are necessary. As a measure against electromagnetic shielding, for example, a ferrite core is mounted over the entire length of the wiring, so a large amount of ferrite core is required, and the load weight on the wiring increases, and in some cases the weight of the ferrite core damages the measured object. There is a risk of causing it.

  The present invention has been made to solve the above-described problems, and provides a turntable device capable of suppressing the influence of wiring such as a high-frequency cable connected to a measurement object on the measurement result of the measurement object. The purpose is that.

  The turntable device according to claim 1 of the present invention includes at least a first rotating body that rotates via a drive mechanism, and is disposed above the rotating body via a predetermined gap and a measured object is installed. A first rotating body connected to each other via a connecting member, wherein the first rotating body is the object to be measured. The second rotating body has a through-hole through which the wiring connected to the measurement object passes, and the second rotating body has at least the upper surface thereof. And a radio wave absorber.

  A turntable device according to a second aspect of the present invention is the turntable device according to the first aspect, further comprising an installation body for installing the measured object, the installation body penetrating through the wiring. It has a hole.

According to a third aspect of the present invention, the turntable device according to the second aspect is characterized in that the installation body is made of foamed polystyrene .

  According to a fourth aspect of the present invention, there is provided the turntable device according to any one of the first to third aspects, wherein the outer peripheral surfaces of the first and second rotating bodies are the gaps. It is characterized by being covered with a radio wave absorber provided across.

  According to the first to fourth aspects of the present invention, it is possible to provide a turntable device capable of suppressing the influence of electromagnetic waves caused by wiring such as a high-frequency cable connected to a measurement object. it can.

  Hereinafter, the present invention will be described based on the embodiment shown in FIGS.

1st Embodiment The turntable apparatus 10 of this embodiment is the rotation provided through the base 11A on the floor 21 of the anechoic chamber 20, for example, as shown to (a) of FIG. 1, (b). A driving machine mechanism 11, a first rotating body 12 that rotates via the rotary driving machine mechanism 11, and a second rotating body 13 that is disposed above the first rotating body 12 with a predetermined gap S therebetween. And a connecting member 14 that connects the first and second rotating bodies 12 and 13 to each other to form a gap S, and faces a measurement antenna (not shown) installed in the anechoic chamber 20, for example. The device under test (for example, an electronic device or a device under test antenna) I is installed on the second rotating body 13. The measurement antenna is installed on mounting means such as an antenna positioner, for example, and measures the influence of the electromagnetic wave of the measured object I and the antenna characteristics of the measured antenna.

  The form of the connecting member 14 between the first rotating body 12 and the second rotating body 13 is not particularly limited, and the connecting member 14 is, for example, the circumferential direction of the first and second rotating bodies 12 and 13. It may be composed of a plurality of support columns arranged at predetermined intervals, or may be formed as a cylindrical connection member.

  A radio wave absorber 15 is provided on the upper surface of the base 11A of the second rotary body 13 and the rotation drive mechanism 11, respectively, and electromagnetic waves are absorbed by the radio wave absorber 15 on the second rotary body 13 and the base 11A, It does not reflect. A radio wave absorber 15 is also laid on the floor 21 of the anechoic chamber 20. The radio wave absorber 15 is not limited to a specific material as long as it is made of a material that absorbs electromagnetic waves and does not reflect. Examples of such a material include conventionally known materials such as a resin material obtained by impregnating carbon with a resin such as urethane foam or styrene. The form of the radio wave absorber 15 is not particularly limited, and may be formed in a pyramid shape as shown in FIG. 1 (a), or may be formed in a plate shape. Further, the second rotating body 13 itself may be formed as a radio wave absorber.

  When installing the measurement object I on the second rotating body 13, the installation body 16 is used. The installation body 16 is installed on the second rotating body 13 via the radio wave absorber 15 and adjusts the height of the measurement object I according to the measurement antenna. The installation body 16 is preferably formed of a material having a relative dielectric constant close to 1, for example, a resin material 4 such as polystyrene foam. Further, in this embodiment, as shown in FIG. 1A, the first and second rotating bodies 12 and 13 are each formed in a disk shape having substantially the same outer diameter, for example, and the installation body 16 is The first and second rotating bodies 12 and 13 are formed in a columnar shape having substantially the same outer diameter.

  The installation body 16 is fixed on the second rotary body 13 so that the position of the installation body 16 does not shift on the radio wave absorber 15 due to the rotation of the turntable device 10. The fixing means of the installation body 16 is not particularly limited, and for example, a plurality of protrusions (not shown) provided on the second rotating body 13 are fitting holes provided on the installation body 16 corresponding to these protrusions. It may be a structure that fits in (not shown), or a structure in which a plurality of protrusions provided in the installation body 16 are inserted into a plurality of fitting holes provided in the second rotating body 13. Also good.

  The object to be measured I is connected to a measuring device (not shown) installed outside the anechoic chamber 20 via the high-frequency cable C. Therefore, the rotary connector 12A is provided as a connection portion with the high frequency cable C in the center of the upper surface of the first rotating body 12, and the second rotating body 13 and the installation body 16 penetrate through the high frequency cable C. Holes 13A and 16A are respectively formed. The measured object I is connected to the rotary connector 12A via the high-frequency cable C. When the high-frequency cable C is long, the extra high-frequency cable C1, that is, the extra length C1, is in the gap S formed between the first rotating body 12 and the second rotating body 13, that is, the connecting member 14. It is housed in a circular shape inside it.

  In the present embodiment, the high-frequency cable C passes through the through hole 16A of the installation body 16 and the through hole 13A of the second rotating body 13, and the extra length C1 is housed inside the connection member 14 and is also a radio wave absorber. 15, the high frequency cable C does not function as an electromagnetic wave radiation source or antenna, does not interfere with the electromagnetic wave during measurement, and receives the electromagnetic wave during measurement. It is possible to prevent or suppress the influence of the measurement object I on the measurement result. The portion of the high-frequency cable C from the base 11A of the rotational drive mechanism 11 to the measuring device outside the anechoic chamber 20 passes through the inside of the electromagnetic wave absorber 15, so that it does not interfere with electromagnetic waves during measurement. The influence on the measurement result can be suppressed. That is, even when an electromagnetic wave is radiated from the high-frequency cable C on the base 11A, the electromagnetic wave hardly interferes with the measuring electromagnetic wave, and the influence can be prevented or suppressed.

  In order to examine the influence on the measurement result of the high-frequency cable C, for example, the high-frequency cable C passes through the through hole 16A of the installation body 16 and the through hole 13A of the second rotating body 13 as shown in FIG. The directivity (vertically polarized wave) of the dipole antenna is measured using the turntable device 10 and the turntable device 50 in which the high-frequency cable C passes outside the second rotating body 53 as shown in FIG. The difference between the maximum value and the minimum value was measured and compared. Each of these high-frequency cables C had a length of about 2 m. As a result, in the case of the turntable device 10 shown in FIG. 1A, the difference was 2.4 dB, but in the turntable device 50 shown in FIG. 2, the difference was 2.7 dB. In FIG. 2, members indicated by reference numerals in the tenth embodiment of the first embodiment are indicated by reference numerals in the fifty order.

  That is, in the case of this embodiment, it was found that the difference between the maximum value and the minimum value was reduced by 0.3 dB compared with the case where the high-frequency cable C was pulled out to the side surface of the turntable device 50, and the measurement accuracy was improved. . This is because the extra length C1 of the high-frequency cable is located below the radio wave absorber 15, so that radiation and reflection of electromagnetic waves from the high-frequency cable C to the surroundings are suppressed, and variations in antenna directivity are reduced. means. Further, since the extra length C1 of the high-frequency cable C is accommodated in the gap S between the first rotating body 12 and the second rotating body 13, it is uniquely located below the anechoic chamber as in the prior art. It is not necessary to provide the electromagnetic shielding chamber, and the gap S corresponding to the electromagnetic shielding chamber can be provided easily and at low cost.

  As described above, according to the present embodiment, the first rotating body 12 that rotates via the rotation drive mechanism 11 and the object to be measured I that is disposed above the rotating body 12 via the predetermined gap S and that is measured. And a connecting member 14 that connects the first and second rotating bodies 12 and 13 to each other to form a gap S, and the first rotating body 12 is to be measured. The second rotating body 13 has a through hole 13A through which the high frequency cable C passes, and the second rotating body 13 has a radio wave on the upper surface thereof. Since the absorber 15 is included, the gap S between the first and second rotating bodies 12 and 13 is isolated from the electromagnetic space of the measurement region in the anechoic chamber 20, and the electromagnetic waves derived from the high-frequency cable C are transmitted to the second rotating body 13. Does not interfere with the upper electromagnetic wave, or Without the measuring region receives the electromagnetic waves, high frequency cable C can be prevented from influence on the measurement result of the measured sample I.

  In addition, since the gap S between the first rotating body 12 and the second rotating body 13 has an electromagnetic wave shielding structure by the radio wave absorber 15, there is no need to provide an independent electromagnetic wave shielding chamber below the anechoic chamber 20. Therefore, regardless of the floor where the anechoic chamber is provided, the gap S corresponding to the electromagnetic shielding chamber can be provided easily and at low cost.

  Moreover, since the installation body 16 has a through hole 16A through which the high-frequency cable C passes and is formed of a material having a relative dielectric constant close to 1 (styrofoam), the installation body 16 is connected to the high-frequency cable C of the measured object I. By passing through the 16 through holes 16A, the radiated electromagnetic wave from the high-frequency cable C does not interfere with the electromagnetic wave in the measurement region of the measurement object I, and does not receive the electromagnetic wave in the measurement region. The measurement accuracy and reliability of the measurement result of I can be improved. Further, by passing the high-frequency cable C of the measured object I through the through hole 16A of the installation body 16, the length of the high-frequency cable C can be minimized. Further, when the connecting member 14 is formed as a cylindrical body, the gap S between the first and second rotating bodies 12 and 13 can be completely isolated from the anechoic chamber 20, so that the high-frequency cable C is used. The influence can be prevented more reliably.

Second Embodiment In the present embodiment, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and only the features of the present embodiment will be described. As shown in FIG. 3, the turntable device 10 </ b> A of the present embodiment includes a rotation driving mechanism 11, first and second rotating bodies 12 and 13, a connection member 14, a radio wave absorber 15, and an installation body 16. Except that the outer peripheral surfaces of the first and second rotating bodies 12 and 13 are surrounded by the radio wave absorber 15, they are configured according to the first embodiment. That is, in the present embodiment, the upper surface of the second rotating body 13 is covered with the radio wave absorber 15 and the entire outer peripheral surfaces of the first and second rotating bodies 12 and 13 are formed between the two. The electromagnetic wave absorber 15 provided across the gap S is completely covered. Therefore, the gap S between the first and second rotating bodies 12 and 14 is electromagnetically independent from the anechoic chamber 20, and the influence of the high-frequency cable C housed in the gap S on the measurement result of the measurement object I is affected. It can be surely prevented.

  Therefore, according to the present embodiment, by completely surrounding the gap S with the radio wave absorber 15, the high-frequency cable C in the gap S is electromagnetically reliably separated from the anechoic chamber 20, and the influence of the high-frequency cable C is affected. It can prevent more reliably and can further improve measurement accuracy and reliability.

Third Embodiment Also in this embodiment, the same reference numerals are given to the same or corresponding parts as in the first embodiment, and only the features of this embodiment will be described. As shown in FIG. 4, the turntable device 10 </ b> B of the present embodiment includes a rotation drive mechanism 11, first and second rotating bodies 12 and 13, a connection member 14, a radio wave absorber 15, and an installation body 16. The third rotating body 17 is configured according to the first embodiment except that the third rotating body 17 is interposed between the first rotating body 12 and the second rotating body 13.

  That is, in the present embodiment, the first rotating body 12 and the third rotating body 17 are connected to each other by the connecting member 14A that forms the gap S therebetween, and the second rotating body 13 and the third rotating body 13 are connected to each other. The rotating bodies 17 are connected to each other by a connecting member 14B that forms a gap S ′ therebetween. The connecting members 14A and 14B are configured as the same member. Similar to the first and second rotating bodies 12 and 13, the third rotating body 17 is formed with a through hole 17 </ b> A in its axial center, and the high frequency cable C passes through the through hole 17 </ b> A. The upper and lower gaps S and S 'may be the same size or different sizes. In addition to the third rotator 17, a plurality of rotators of the same type may be added between the first and second rotators 12 and 13 to form a multi-stage turntable device. In the present embodiment, the same effects as those in the first embodiment can be expected.

  In addition, this invention is not restrict | limited to the said embodiment at all, Each component of this invention can be suitably changed in design as needed.

  The present invention can be suitably used as, for example, a turntable device installed in an anechoic chamber.

(A), (b) is a figure which shows one Embodiment of the turntable apparatus of this invention, respectively, (a) is the side view, (b) is the top view. It is a side view which shows the turntable apparatus for comparing with the turntable apparatus shown in FIG. It is a side view which shows other embodiment of the turntable apparatus of this invention. It is a side view which shows other embodiment of the turntable apparatus of this invention. It is sectional drawing which shows the principal part of the anechoic chamber equipment to which the conventional turntable apparatus was applied. It is a perspective view which shows another example of the conventional turntable apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10A, 10B Turntable apparatus 11 Rotation drive mechanism 12 1st rotary body 12A Rotary connector 13 2nd rotary body 13A Through-hole 14 Connection member 15 Radio wave absorber 16 Installation body 16A Through-hole I Measured object C High frequency cable (wiring)
S, S 'gap

Claims (4)

  At least a first rotating body that rotates via a drive mechanism, and a second rotating body that is disposed above the rotating body via a predetermined gap and in which a device to be measured is installed, The first and second rotating bodies are turntable devices connected to each other via a connecting member, and the first rotating body has a connection portion with a wiring connected to the measured body and the first rotating body. The turntable device characterized in that the second rotating body has a through-hole through which the wiring connected to the measured object passes, and the second rotating body has a radio wave absorber on at least the upper surface thereof. .   The turntable device according to claim 1, further comprising an installation body for installing the measurement object, wherein the installation body has a through hole through which the wiring passes. The turntable device according to claim 2, wherein the installation body is formed of foamed polystyrene .   4. The outer peripheral surface of each of the first and second rotating bodies is covered with a radio wave absorber provided across the gap. 5. Turntable device.

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