Search

CN-115701541-B - Test device and test method

CN115701541BCN 115701541 BCN115701541 BCN 115701541BCN-115701541-B

Abstract

A test apparatus and a test method are disclosed. The test apparatus measures the transmission characteristics or reception characteristics of a DUT having an antenna to be tested, and includes an anechoic chamber, a posture changing mechanism (56) for sequentially changing the posture of the DUT disposed in a blank area in the anechoic chamber, a 1 st test antenna (6 a) and a2 nd test antenna (6 b) which are housed in an internal space and transmit or receive a radio signal for measuring the transmission characteristics or reception characteristics of the DUT with the antenna to be tested, a reflector for reflecting the radio signal transmitted by the 1 st test antenna and converting the radio signal into a radio signal of a plane wave, and an antenna moving mechanism (60) for moving the position of the 2 nd test antenna so that the radio signal can be transmitted or received to the DUT disposed in a far field at a plurality of arrival angles or a plurality of emission angles with reference to the arrival direction of the radio wave from the 1 st test antenna or the radio wave transmission direction to the 1 st test antenna.

Inventors

  • MARUO TOMOHIKO
  • Harinagawa Hiroshi

Assignees

  • 安立股份有限公司

Dates

Publication Date
20260505
Application Date
20220527
Priority Date
20210802

Claims (9)

  1. 1. A test device for measuring a transmission characteristic or a reception characteristic of a test object (100) having a test antenna (110), the test device (1) comprising: an anechoic chamber (50) having an internal space that is not affected by the surrounding radio wave environment; A posture-changing mechanism (56) for sequentially changing the posture of the test object disposed in the empty space (QZ) in the internal space; A1 st test antenna (6 a) and a2 nd test antenna (6 b) which are housed in the internal space and transmit or receive a radio signal for measuring a transmission characteristic or a reception characteristic of the test object to the test antenna; a reflector (7) for reflecting the radio signal emitted by the 1 st test antenna and converting the radio signal into a radio signal of a plane wave, and And an antenna movable mechanism (60) for moving the position of the antenna for the 2 nd test so as to be capable of transmitting or receiving wireless signals to or from the object to be tested which is arranged in a far field at a plurality of arrival angles or a plurality of transmission angles with reference to the arrival direction of the radio wave from the antenna for the 1 st test or the transmission direction of the radio wave to the antenna for the 1 st test.
  2. 2. The test device according to claim 1, wherein, The antenna movable mechanism is provided with an antenna holding part (600) for holding the antenna for the 2 nd test, and a moving mechanism (700) for moving the antenna holding part on a circle.
  3. 3. The test device according to claim 2, wherein, The antenna holding section has a columnar support (61) for holding the 2 nd test antenna, and the support is inclined with respect to the vertical direction so as to be attached to one end portion of the moving mechanism on the center axis side of the circle than the other end portion.
  4. 4. A test device according to claim 2 or 3, further comprising: A reflecting mirror (9) for reflecting a radio signal emitted from the 2 nd test antenna and transmitting the radio signal to the antenna to be tested, and reflecting a radio signal emitted from the antenna to be tested and transmitting the radio signal to the 2 nd test antenna, The antenna holding portion holds the 2 nd test antenna and the reflecting mirror with a space therebetween in a longitudinal direction.
  5. 5. The test device according to any one of claims 2 to 4, wherein, The moving mechanism comprises a linear motion part (701) for linearly moving a moving table (72), an arc-shaped guide rail (76), a movable table (77) which is fixed to the antenna holding part and can move along the arc-shaped guide rail, and a link (703) which connects the moving table and the movable table and moves the movable table along the arc-shaped guide rail by the linear motion of the moving table, The link is connected to the mobile station such that a longitudinal direction of the link is always orthogonal to a moving direction of the mobile station.
  6. 6. The test device according to any one of claims 2 to 4, wherein, The moving mechanism comprises a linear motion part (701) for linearly moving a moving table (72), an arc-shaped guide rail (76), a movable table (77) which is fixed to the antenna holding part and can move along the arc-shaped guide rail, and a link (703) which connects the moving table and the movable table and moves the movable table along the arc-shaped guide rail by the linear motion of the moving table, The link is connected to the mobile station such that an angle formed by a longitudinal direction of the link with respect to a moving direction of the mobile station changes according to a position of the mobile station.
  7. 7. The test device according to any one of claims 2 to 4, wherein, The moving mechanism comprises an annular or arc-shaped rack (81) with a plurality of teeth formed on the inner peripheral surface or the outer peripheral surface, a pinion (82) which is provided with a gear engaged with the teeth of the rack and is rotated by a rotation driving part to move along the rack, and a movable table (84) which is mounted on the pinion, The antenna holding portion is attached to the movable table.
  8. 8. The test device according to any one of claims 2 to 4, wherein, The moving mechanism comprises an annular or arc-shaped rack (85) with a plurality of teeth formed on the inner peripheral surface or the outer peripheral surface, a pinion (86) which is provided with a gear engaged with the teeth of the rack and rotates the rack by rotating a rotation driving part, and a movable table (88) which is mounted on the rack, The antenna holding portion is attached to the movable table.
  9. 9. A test method using the test device of any one of claims 1 to 8, the test method comprising: a step of selecting one of the arrival angles or the emission angle; A step of moving the test antenna 2 by the antenna moving mechanism so as to be the selected arrival angle or emission angle; sequentially changing the posture of the test object disposed in the blank area, and And measuring the transmission characteristic or the reception characteristic of the test object using the 1 st and 2 nd test antennas each time the posture of the test object is changed.

Description

Test device and test method Technical Field The present invention relates to a test apparatus and a test method for measuring transmission characteristics or reception characteristics of a test object using an anechoic chamber in an Over The Air (OTA) environment. Background In recent years, with the development of multimedia, wireless terminals (smart phones and the like) equipped with antennas for wireless communication such as cellular and wireless LAN have been mass-produced. In the future, a wireless terminal for transmitting and receiving wireless signals corresponding to ieee802.11ad or 5G cells using wideband signals in the millimeter wave band is particularly demanded. In a design development company of a wireless terminal or a manufacturing factory thereof, a performance test is performed to measure an output level and a reception sensitivity of a transmission Radio wave set for each communication standard with respect to a wireless communication antenna provided in the wireless terminal, and to determine whether or not the RF (Radio Frequency) characteristics satisfy a predetermined standard. In the performance test, RRM (Radio Resource Management: radio resource management) characteristics are also measured. The RRM characteristic is measured to confirm whether or not radio resource control between the base station and the radio terminal, for example, handover between adjacent base stations, is operating normally. The test methods for the performance test described above are also changing with 4G or the evolution from 4G to 5G. For example, in a performance test in which a wireless terminal for a 5G NR (New Radio: new Radio) system is a test object (Device Under Test: DUT), a method of wired connection of an antenna terminal of the DUT and a test apparatus, which is a mainstream in a test of 4G or 4G evolution, cannot be used because of a characteristic deterioration caused by mounting the antenna terminal in a high-frequency circuit, a large number of elements of an array antenna, and a fact that the antenna terminal is mounted on all elements is not practical in terms of space and cost. Therefore, a DUT is housed in an anechoic chamber that is not affected by the surrounding radio wave environment together with a test antenna, and a so-called OTA test is performed by transmitting a test signal from the test antenna to the DUT and receiving a measured signal from the DUT that received the test signal by the test antenna through wireless communication (for example, refer to patent document 1). In the OTA test, a test antenna disposed in an anechoic chamber forms, for example, a spherical blank space (quiet zone), and a DUT is disposed in the blank space. Here, the blank space is a concept of a range in which a space region of the DUT is irradiated with radio waves of substantially uniform amplitude and phase from the test antenna in an anechoic chamber constituting an OTA test environment (for example, refer to non-patent document 1). By disposing the DUT in such a blank region, an OTA test can be performed with the influence of scattered waves from the surroundings suppressed. Patent document 1 Japanese patent laid-open No. 2020-085784 Non-patent document 1:3GPP TR 38.810 Fig. 16 is a top view of a conventional test apparatus with the top plate of the anechoic chamber removed to measure RRM characteristics of the DUT, as viewed from above. The conventional test apparatus includes a reflector-reflection type test antenna 206a for receiving a power wave from the DUT100 via a reflector 207 and test antennas 206b, 206c, 206d, 206e, and 206f for transmitting and receiving a power wave to and from the DUT 100. The 5 test antennas 206b and 206f are disposed at the arrangement position (origin O) of the DUT100 so as to form 5 arrival angles (30 °,60 °,90 °, 120 °, 150 °) different from each other with reference to the arrival direction of the radio wave from the reflector-reflecting test antenna 206 a. The transmission/reception characteristics such as RRM characteristics were measured for each of a plurality of arrival angles using 2 test antennas selected from the test antennas 206a, 206f. However, if the number of test antennas is large, the device cost and installation cost increase, and therefore, it is desired to reduce the number of test antennas. Disclosure of Invention The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a test apparatus and a test method capable of performing far-field measurement of transmission/reception characteristics such as RRM characteristics of a test subject with a small number of antennas. In order to solve the above problems, a test device according to the present invention measures a transmission characteristic or a reception characteristic of a test object (100) having a test antenna (110), wherein the test device (1) has a configuration including an anechoic chamber (50) havi