Patent Publication Number: US-2021190855-A1

Title: Electronic component testing apparatus, sockets, and replacement parts for electronic component testing apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority from Japanese Patent Application No. 2019-232547 filed on Dec. 24, 2019. The contents described and/or illustrated in the documents relevant to the Japanese Patent Application No. 2019-232547 are incorporated herein by reference as a part of the description and/or drawings of the present application. 
     BACKGROUND 
     Technical Field 
     The present invention relates to an electronic component testing apparatus used in the test of the electronic component under test (DUT: Device Under Test) which has an antenna, and relates to a socket and a replacement component for the electronic component test apparatus, 
     Description of the Related Art 
     As a method of determining radiation performance characteristics of a wireless device, a method of measuring a signal from the wireless device which is attached to an attachment mechanism in a far field anechoic chamber, is known (for example, see in Patent Document 1). 
     PATENT DOCUMENT 
     Patent Document 1: JP 2008-518567 A 
     As the OTA (Over The Air) test of wireless devices, a test in near-field may be performed instead of the test in far--field as described above. 
     SUMMARY 
     One or more embodiments of the present invention provide an electronic component testing device, sockets, and replacement components capable of performing the OTA test on a near-field. 
     [1] One or more embodiments of the present invention provide an electronic component testing apparatus for testing a DUT which has a device antenna (i.e., device antenna unit) and a terminal which is formed on a first main surface of the DUT including a socket (i.e., socket unit) which is to be electrically connected to the DUT, a first wiring board, and a tester which has a test head in which the first wiring board is mounted. The socket includes a first socket which is disposed to face the first main surface and is to be electrically connected to the DUT and a second socket which is mounted on the first wiring board. The second socket is to contact the second main surface opposite to the first main surface of the DUT and is to be electrically connected to the first socket. The second socket includes a base which is to contact the second main surface of the DUT and a test antenna I.e., test antenna unit)) which is electrically connected to the tester and disposed to face the device antenna. The tester tests the DUT by transmitting and receiving radio waves between the device antenna and the test antenna in a state in which the DUT and the first socket are electrically connected to each other and the first socket is electrically connected to the test head through the second socket. 
     [2] One or more embodiments of the present invention provide an electronic component test apparatus for testing a DUT which has a device antenna and a terminal which is formed on a first main surface of the DUT including a socket which is to be electrically connected to the DUT, a first wiring board which has a first opening (i.e., board opening), and a tester which has a test head in which the first wiring board is mounted. The socket includes a first socket which is disposed so as to face the first main surface, is to he electrically connected to the DUT and is the first wiring board, and a second socket which is exposed from the first wiring board through the first opening and is to contact the second main surface opposite to the first main surface of the DUT. The second socket includes a base which is to contact the second main surface of the DUT and a test antenna which is electrically connected to the tester and disposed to face the device antenna. The tester tests the DUT by transmitting and receiving radio waves between the device antenna and the test antenna in a state in which the DUT and the first socket are electrically connected to each other and the first socket is electrically connected to the test head through the first wiring board. 
     [3] In one or more embodiments, the second socket may include a first attenuation member (i.e., first attenuation sheet) which attenuates radio waves radiated from the device antenna or the test antenna. The first attenuation member may be interposed between the test antenna and the device antenna. 
     [4] In one or more embodiments, the device antenna may include a first device antenna provided on the second main surface. The test antenna may include a first test antenna disposed to face the first device antenna. The base may have a second opening (i.e., base opening) through which first test antenna faces the first device antenna. 
     [5] In one or more embodiments, the first attenuation member may be provided in the second opening to he interposed between the first test antenna and the device antenna. 
     [6] In one or more embodiments, the second socket may include a second attenuating member which is provided on the inner surface of the second opening and attenuates radio waves radiated from the first device antenna or the first test antenna The second socket may include a shield layer which is provided on the outer surface of the base, shielding radio waves from the outside. 
     [7] In one or more embodiments, the first test antenna may he a patch antenna which includes a substrate, a radiating element (i.e., radiator) provided on the substrate, a wiring pattern which is provided on the substrate and connected to the radiating element. 
     [8] In one or more embodiments, the first test antenna may include a plurality of said radiating elements which is provided in a matrix on the substrate, and one of the wiring pattern connected to the plurality of radiating elements. 
     [9] In one or more embodiments, the first test antenna may include a plurality of the radiating elements which is provided in a matrix on the substrate, and a plurality of wiring patterns respectively which is connected to the plurality of radiating elements. 
     [10] In one or more embodiments, the device antenna may include a second device antenna which is provided on the side of the DUT. The test antenna may include a second test antenna which is disposed so as to face the second device antenna the second test antenna may be disposed in a direction substantially parallel to the first main surface with respect to the DUT. 
     [11] In one or more embodiments, the electronic component testing apparatus may include an electronic component handling device which holds and moves the DUT and having a moving device capable of relatively pressing the DUT to the socket. 
     [12] In one or more embodiments, the moving device may include a holding portion (i.e., holder) which has an adsorption mechanism for holding the DUT. The first socket may be attached to the tip of the holding portion. 
     [13] In one or more embodiments, the first socket may include a first connecting portion electrically connectable with the terminal of the DUT, a first conductive path whose one end is connected to the first connecting portion, and a second connecting portion which is connected to the other end of the first conductive path. The second socket may include a third connecting portion electrically connectable with the second connecting portion of the first socket. The first wiring board may include a fourth connecting portion electrically connectable with the third connecting portion of the base portion and a third conductive path which connected to the fourth connecting portion. The third conductive path may be electrically connected to the test head. 
     [14] In one or more embodiments, the first socket may include a body and a third wiring board to which the body is attached. The first connecting portion may be a first pogo pin. The body may include a first holding hole into which the first pogo pin is inserted and may hold the first pogo pin. The first conductive path may include a first wiring pattern which is formed on the third wiring board. The second connecting portion may be a first pad which provided at one end of the first wiring pattern. The third connecting portion may be a second pogo pin electrically connectable to the first pad. The base may have a second holding hole into which the second pogo pin is inserted and may hold the second pogo pin. 
     [15] In one or more embodiments, the test antenna may be fixed to the base. 
     [ 16 ] In one or more embodiments, the first socket may include a first connecting portion electrically connectable with the terminal of the DUT, a first conductive path whose one end is connected to the first connecting portion, and a second connecting portion which is connected to the other end of the first conductive path. The first wiring board may include the second connecting portion of the first socket and electrically connectable fourth connecting portion and a third conductive path which is connected to the fourth connecting portion. The third conductive path may be electrically connected to the test head. 
     [17] In one or more embodiments, the first socket may include a body and a third wiring hoard to which the body is attached. The first connection portion may be a first pogo pin, the body may have a first holding hole into which the first pogo pin is inserted and hold the first pogo pin. The first conductive path may include a first wiring pattern which is formed on the third wiring board. The second connection portion may be a third pogo pin, the body may have a third holding hole into which the third pogo pin is inserted and hold the third pogo pin. The fourth connection portion may a second pad which is formed on the first wiring board and electrically connectable to the third pogo pin. 
     [18] In one or more embodiments, the test antenna may be fixed to the base. 
     [19] One or more embodiments of the present invention provide a socket which is used for testing DUT which has a device antenna and a terminal which is formed on a first main surface including a first socket which is disposed so as to face the first main surface and which is to be electrically connected to the DUT, and a second socket which is to be contact a second main surface opposite to the first major surface of the DUT and is to be electrically connected to the first socket. The second socket includes a base which is to contact the second main surface of the DUT and a test antenna which is disposed to face the device antenna. 
     [20] One or more embodiments of the present invention provide a socket which is used for testing a DUT which has a device antenna and a terminal which is farmed on a first main surface including a first socket which is disposed so as to face the first main surface and which is to be electrically connected to the DUT, a second socket which is to be contact a second main surface opposite to the first main surface of the DUT, and a first wiring hoard which has a first opening which exposes the second socket and is to be electrically connected to the first socket. The second socket includes a base which is contacts the second main surface of the DUT and a test antenna which is disposed to face the device antenna, 
     [21] in one or more embodiments, die second socket may include a first attenuation member which attenuates radio waves radiated from the device antenna or the test antenna. The first attenuation member may be interposed between the test antenna and the device antenna. 
     [22] in one or more embodiments, the device antenna may include a first device antenna which is provided on the second main surface, the test antenna may include a first test antenna disposed so as to face the first device antenna. The base portion may have a second opening through which the first test antenna. faces the first device antenna. 
     [23] In one or more embodiments, the first attenuation member may be provided in the second opening to be interposed between the first test antenna and die device antenna. 
     [24] In one or more embodiments, the second socket may include a second attenuating member which is provided on the inner surface of the second opening and attenuates radio waves radiated from the first device antenna or the first test antenna and a shield layer which is provided on the outer surface of the base and shields radio waves from the outside. 
     [25] In one or more embodiments, the first test antenna may be a patch antenna which includes a substrate, a radiating element (i.e., radiator) which is provided on the second substrate, and a wiring pattern which is connected to the radiating element. 
     [26] In one or more embodiments, the first test antenna may include a plurality of the radiating elements which is provided in a matrix on the substrate, and one of the wiring pattern which is connected to the plurality of radiating elements. 
     [27] In one or more embodiments, the first test antenna may include a plurality of the radiating elements which is provided in a matrix on the substrate, and a plurality of wiring patterns which is respectively connected to the plurality of radiating elements. 
     [28] In one or more embodiments, the device antenna may include a second device antenna which is provided on the side of the DUT. The test antenna may include a second test antenna which is disposed to face the second device antenna. The second test antenna may be disposed in a direction substantially parallel to the first main surface with respect to the DUT. 
     [29] One or more embodiments of the present invention provide a replacement component which is used for testing a DUT which has a device antenna and a terminal which is formed on a first main surface including a base which contacts the DUT with a second main surface opposite to the first main surface and a first test antenna which is disposed so as to face the device antenna. The base is a replacement component which has a second opening through which the first test antenna faces to the first device antenna. 
     [30] In one or more embodiments, the replacement component may include a first attenuation member which attenuates radio waves radiated from the device antenna or the first test antenna. The first attenuation member may be provided in the second opening to be interposed between the test antenna and the device antenna. 
     [31] In one or more embodiments, the replacement component may include a second attenuation member (i.e..second attenuation sheet) which is provided on the inner surface of the second opening and attenuates radio waves radiated from the first device antenna or the first test antenna, and a shield layer which is provided on the outer surface of the base and shields radio waves from the outside. 
     [32] In one or more embodiments, the first test antenna may be a. patch antenna that include a substrate, a radiating element (i.e., radiator) which is provided on the substrate, a wiring pattern which is provided on the substrate and connected to the radiating element. 
     [33] In one or more embodiments, the first test antenna may include a plurality of the radiating elements which is provided in a matrix on the substrate, and one of the wiring pattern which is connected to the plurality of radiating elements. 
     [34] In one or more embodiments, the first test antenna may include a plurality of the radiating elements which is provided in a matrix on the substrate, and a plurality of wiring patterns which is respectively connected to the plurality of radiating elements, 
     [35] In one or more embodiments, the device antenna may include a second device antenna which is provided on the side of the DUT. The test antenna may include a second test antenna which is disposed to face the second device antenna. The second test antenna may be disposed in a direction substantially parallel to the first main surface with respect to the DUT. 
     In one or more embodiments of the present invention, the second socket, which is to contact the second main surface of the DUT, includes a test antenna disposed to face the device antenna of the DUT. Contacting of the second main surface of the DUT with the base of the second socket positions the device antenna and the test antenna such that radio waves from the device antenna reach the test antenna in near-field. This allows to perform the OTA test at near-field. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic cross-sectional view showing an overall configuration of an electronic component testing apparatus according to the first embodiment of the present invention. 
         FIG. 2  is a cross-sectional view showing a contact chuck in the first embodiment of the present invention and shows before the contact chuck contacts the DUT. 
         FIG. 3  is an enlarged cross-sectional view of a part III of  FIG. 1  showing before pressing the DUT to the socket according to the first embodiment of the present invention. 
         FIG. 4  shows pressing the DUT to the socket according to the first embodiment of the present invention and corresponds to  FIG. 3 . 
         FIG. 5  is an enlarged sectional view of the V portion of  FIG. 3 , 
         FIG. 6  is a plan view showing a test antenna according to the first embodiment of the present invention. 
         FIG. 7  is a plan view showing a modification of the test antenna according to the first embodiment of the present invention. 
         FIG. 8  is a cross-sectional view showing a first modification of the top socket and he bottom socket according to the first embodiment of the present invention. 
         FIG. 9  is a cross-sectional view taken along IX-IX line of  FIG. 8  showing a first modification of the bottom socket according to the first embodiment of the present invention. 
         FIG. 10  is a cross-sectional view showing a second modification of he bottom socket in the first embodiment of the present invention. 
         FIG. 11  is a cross-sectional view showing a. modification of the electronic component testing apparatus according to the first embodiment of the present invention. 
         FIG. 12  is a schematic cross-sectional view showing the overall configuration of the electronic component test apparatus according to the second embodiment of the present invention. 
         FIG. 13  is an enlarged cross-sectional view of XIII portion of  FIG. 12  showing pressing the DUT to the socket according to the second embodiment of the present invention, 
         FIG. 14  shows pressing the DUT to the socket according to the second embodiment of the present invention and corresponds to  FIG. 13 , 
         FIG. 15  is an enlarged cross-sectional view of the XV portion of  FIG. 13 . 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments of the present invention will be Described with reference to the drawings. 
     The First Embodiment 
       FIG. 1  is a schematic cross-sectional view showing the overall configuration of the electronic component testing apparatus according to the present embodiment. 
     An electronic component testing apparatus  1  in the present embodiment is an apparatus for performing an OTA test of the DUT having a device antenna. This testing apparatus  1  tests the radio wave radiation characteristics of the DUT  10  which includes the device antenna  12 . For the test of radiation characteristics, a test antenna  73  (to be described later) receives radio waves (so-called millimeter waves) with a frequency of 24.250 to 52,600 GHz, which are radiated from the DUT  10 , in the near-field. The testing apparatus  1  also tests the radio wave reception characteristics of the DUT  10 . For the test of reception characteristics, the DUT  10  receives the millimeter waves, which are radiated from the test antenna  73 , in the near-field. 
     The DUT  10  to he tested is a so-called AiP (Antenna in Package) device. The DUT  10  includes a device antenna  12  formed on the lower surface  11   b  of the substrate  11 , a semiconductor chip  13  mounted on the lower surface  11   b  of the substrate  11 , and input-output terminals  14  formed on the upper surface  11   a  of the substrate  11  (refer to  FIG. 2 ). The semiconductor chip  13  is a device for controlling the transmission and reception of the device antenna  12 . Specific examples of device antennas  12  may include patch antennas, dipole antennas, and Yagi antennas. Although not particularly shown, the semiconductor chip  13  may he mounted on the upper surface  11   a  of the substrate  11 . 
     The DUT  10  in the present embodiment corresponds to an example of “DUT,” the device antenna  12  in the present embodiment corresponds to an example of “first device antenna,” the input-output terminals  14  in the present embodiment corresponds to an example of “terminal,” the upper surface  11   a  in the present embodiment corresponds to an example of “first main surface,” the lower surface  11   b  in the present embodiment corresponds to an example of “second main surface,” in this disclosure, 
     As shown in  FIG. 1 , the testing apparatus  1  according to the present embodiment includes a handler  2  for moving the DUT  10 , a tester  3  for performing the DUT  10  test, a load board  4  mounted on a test head  32  (to be described later) of the tester  3 , and a socket  5  mounted on the load board  4  and electrically connectable to the DUT  10 . The handler  2 . press the DUT  10  against the socket  5  and electrically connect the DUT  10  to the tester  3 . The tester  3  performs the following test on the DUT  10 . First, the tester  3  tests radio waves radiation characteristics of the DUT  10 . The tester  3  sends a test signal to the DUT  10  through the socket  5 . radiating radio waves from the device antenna  12  of the DUT  10 , and receiving the radio waves at the test antenna  73  (described later) of the socket  5 . Next, the tester  3  test the radio waves reception characteristics of the DUT  10  by radiating radio waves from the test antennas  73  and receiving the radio waves at the DUT  10 . 
     The electronic component testing apparatus  1  in the present embodiment corresponds to an example of the “electronic component testing apparatus,” the handler  2  in the present embodiment corresponds to an example of the “electronic component handling apparatus,” the tester  3  in the present embodiment corresponds to an example of the “tester,” the load board  4  in the present embodiment corresponds to an example of the “first wiring board,” and the socket  5  in the present embodiment corresponds to an example of the “socket,” in this disclosure. 
     The handler  2  includes, as shown in  FIG. 1 , a thermostatic chamber  20  and a contact arm  21 . The handler  2  has a laterally projecting portion, and the thermostatic chamber  20  is accommodated in the projecting portion, and a test head  32  is disposed in a space below the projecting portion. That is, the chamber  20  is disposed above the test head  32 . The socket  5  is disposed in the chamber  20  through an opening formed in the bottom of the chamber  20 . The chamber  20  applies a temperature of high or low temperature to the DUT  10  disposed in the socket  5 . Although not particularly limited, the temperature of the chamber  20  may be adjustable in the range of −55° C. to +155° C. The contact arm  21  in the present embodiment corresponds to an example of the “moving device” in this disclosure, 
     The contact arm  21  is a device for moving the DUT  10  and is supported by rails (not shown) included in the handler  2 . The contact arm  21  includes an actuator for horizontal movement (not shown) and can move back and forth and left and right according to the rail. Further, the contact arm  21  includes an actuator for vertical movement (not shown) and can in the vertical direction. The contact arm  21  is includes a contact chuck  22  attached to the distal end of the contact arm  21 . The contact arm  21  can move while holding the DUT  10 . The contact chuck  22  in the present embodiment corresponds to an example of the “holding portion” or “holder” in this disclosure. 
       FIG. 2  is a cross-sectional view showing a contact chuck according to the present embodiment and shows before the contact chuck contacts the DUT. 
     The contact chucks  22  includes, as shown in  FIG. 2 , a suction mechanism  23  for holding the DUT  10  by suction. The suction mechanism  23  includes a suction pipe  24 , a suction pad  25 , and a vacuum pump  26 . The suction pipe  24  is formed along the vertical direction inside the top socket  60 , which is mounted to the tip of the contact chuck  22  (described later). One end of the suction pipe  24  is in communication with the suction pad  25 . The other end of the suction pipe  24  is connected to a vacuum pump  26 . The suction pad  25 , which is in communication with the suction pipe  24 , is open at the lower surface of the top socket  60 . The suction mechanism  23  in this embodiment corresponds to an example of an “adsorption mechanism” in this disclosure. 
     When the contact chuck  22  holds the DUT  10 , the contact chuck  22  moves right above the DUT  10  by the contact arm  21 . as shown in  FIG. 2 . Next, the suction pad  25  contacts the DUT  10  by the contact arm  21 . This forms a sealed space surrounded by the suction pad  25  and the DUT  10 . At this time, the suction pad  25  contacts a flat portion of the upper surface  11   a  of the DUT  10  where the input-output terminal  14  is not formed. The vacuum pump  26  sucks the air in the sealed space through the suction pipe  24 , the contact chuck  22  holds the DUT  10 . 
     The tester  3  includes, as shown in  FIG. 1 , a main frame  31  and a test head  32 . The main frame  31  is connected to the test head  32  via a cable  33 . The main frame  31  sends test signals to the DUT  10  through the test head  32  to test the DUT  10  and evaluates the DUT  10  according to the test result. 
     The test head  32  is connected to the main frame  31  via the cable  33  and sends test signals to the DUT  10  during the test. The test head  32  includes the pin electronics cards inside (not shown), which is electrically connected to the socket  5 . 
     The load board  4  is a wiring board mounted on the test head  32  and is electrically connected to the test head  32  as shown in  FIG. 1 . The load board  4  includes conductive paths  41  and pads  42 . The conductive paths  41  connect electrically the test head  32  to the socket  5 . The pads  42  are provided at the end of the conductive paths  41  (see  FIG. 5 ). Test signals sent from the tester  3  is sent to the DUT to  10  through the conductive paths  41 . The conductive paths  41  include wiring patterns and through holes. 
       FIG. 3  is an enlarged sectional view of the III portion of  FIG. 1  showing before pressing the DUT to the socket in the present embodiment,  FIG. 4  shows pressing the DUT the socket according to the present embodiment and corresponds to  FIG. 3 ,  FIG. 5  is an enlarged sectional view of the V portion of  FIG. 3 . 
     The socket  5 , as shown in  FIG. 3 , includes the top socket  60  mounted to the contact chuck  22 , and a bottom socket  70  mounted to the toad board  4 . As shown in  FIG. 4 , contacting of the top socket  60  held in the contact chuck  22  with the bottom socket  70  allows the electrical connection of the top socket  60  with the bottom socket  70 . The top socket  60  is detachably fixed to the contact chuck  22  by screwing or the like. The bottom socket  70  is also detachably fixed to the load board  4  by screwing or the like. The top socket  60  and the bottom socket  70  are replaced in accordance with a change in the type of the DUT  10 . The top socket  60  in the present embodiment corresponds to an example of the “first socket,” and the bottom socket  70  in the present embodiment corresponds to an example of the “second socket,” in this disclosure. 
     The top socket  60  includes a body  61 , pogo pins  62 , and a wiring board  63 . The body  61  is fixed to the wiring board  63 . The wiring board  63 , for example, is fixed to the body  61  by screwing. 
     The pogo pins  62 , as shown in  FIG. 5 , are disposed inside holding holes  611  formed in the body  61  and are held in the body  61  by the holes  611 . Connecting the pogo pins  62  to the terminals  14  of the DUT  10  makes the connection of the DUT  10  with the testing apparatus  1 . 
     The wiring board  63  includes conductive paths  631  electrically connected to the pogo pins  62  and pads  632  provided at an end of the conductive paths  631 . The paths  631  include a wiring pattern and a through hole. The pads  632  are exposed from the body  61  via the holes  612  formed in the body  61 . 
     The body  61  may include notches for exposing the pads  632  (not shown) in place of the holes  612 . The size of the body  61  may he smaller than the wiring board  63  to expose the pads  632  from the body  61 . 
     The bottom socket  70  includes a base  71 , pogo pins  72 , a test antenna  73 , and an attenuation member  74 . The bottom socket  70  contacts the lower surface  11   b  of the substrate  11 . to hold the DUT  110 -and to connect electrically the socket  60 .. The base  71  in the present embodiment corresponds to an example of a “base,” the test antenna  73  in the present embodiment corresponds to an example of “test antenna” and “first test antenna,” and the attenuation member  74  in the present embodiment corresponds to an example of “first attenuation member” or “first attenuation sheet,” in this disclosure. 
     The base  71  is fixed to the load board  4  by screwing, for example. The base  71  is made of an electrically insulating material such as a resin material, for example. The base  71 , as shown in  FIG. 4 , has a flat surface  711  on its upper, holds the DUT  10  by contacting the lower surface  11   b  of the substrate  11  at the surface  711 . Further, the base  71  includes the opening  712 , through which the test antenna  73  faces the device antenna  12 . of the DUT  10  when the socket  60  contacts the socket  70 . The base portion  71 , as shown in  FIG. 5 , includes holding holes  713  penetrating the base  71  in thickness direction. The pogo pins  72  are inserted into the holes  713 , and the pogo pins  72  are held by the base  71 . The opening  712  in the present embodiment corresponds to an example of the “second opening” or “base opening” in this disclosure. 
     The pogo pins  72  are the contactors that connect the pads  632  of the socket  60 . The lower end of the pogo pins  72  are in contact with and electrically connected to the pads  42  of the load board  4 . The upper end of the pins  72  contact the pad  632  when the socket  60  contacts the socket  70 . Contacting of the pins  72  with the pads  632  the bottom socket  70  the top socket  60 . This transmits a test signal sent from the tester  3  to the socket  60 , 
     The test antenna  73 , as shown in  FIG. 4 , is disposed inside the opening  712  of the base  71  so that the test antenna  73  faces the device antenna  12  when the top socket  60  contacts the bottom socket  70 . The distance between the test antenna  73  and the device antenna  12  is adjusted so that radio waves radiated from the device antenna  12  can reach the test antenna  73  in the near-field. The test antenna  73  includes a patch antenna (microstrip antenna) and a horn antenna. 
       FIG. 6  is a plan view showing a test antenna according to the present embodiment. 
     As shown in  FIG. 6 , the test antenna  73  may include a plurality of radiating elements  732  arranged in a matrix on the upper surface  731   a  of the substrate  731 , and one wiring pattern  733  connected to the plurality of radiating elements  732 . These radiating elements  732  are formed by patterning the metal layer on the substrate  731  and connected to the signal lines of the coaxial connector  734 , which are mounted on the substrate  731 , via the pattern  733 . In the present embodiment, the number of radiating elements  732  may be one. The plurality of radiating elements  732  are arranged. in a matrix of 4 rows×4 columns, however, the number of rows and the number of columns are not limited to this. For example, the radiating elements  732  may be arranged in  8  rowsx 8  columns or in a row. 
     The wiring pattern  733  is a microstrip line, which supplies electricity to the radiating elements  732  and transmits electrical signals from the radiating elements  732  to the coaxial connector  734 . The wiring pattern  733  is branched on one side and is connected to a plurality of radiating elements  732 . The oilier side of the wiring pattern  733  is connected to the coaxial connector  734 . 
     On the entire surface of the lower surface of the test antenna  73 , a ground layer is formed, which is connected to a ground line of the coaxial connector  734 . The coaxial connector  734  is connected to the coaxial cable  735  via another coaxial connector. The test antenna  73  is electrically connected to the tester  3  via the coaxial connector  734 . A waveguide may be interposed between the antenna  73  and the tester  3  by connecting a waveguide-to-coaxial adapter to the coaxial connector  734 . 
     The substrate  731  is fixed to the base  71  by screwing. A shim plate may also be placed between the substrate and the load board  4  to adjust the distance between the test antenna  73  and the device antenna  12 . The substrate  731  in the present embodiment corresponds to an example of a “substrate,” the radiating elements  732  in the present embodiment corresponds to an example of a “radiating element” or “radiator,” the wiring pattern  733  in the present embodiment corresponds to an example of a “wiring pattern,” in this disclosure. 
     The substrate  731  of the test antenna.  73  and the base  71  may be integrally formed. As a method of integrally forming the substrate  731  and the base  71 , a 3D printer can he used. 
       FIG. 7  is a plan view showing a modification of the test antenna according to the present embodiment, 
     The antenna  73 , as shown in  FIG. 7 , may include a plurality of wiring patterns  733  respectively connected to a plurality of radiating elements  732 . The test antenna  73  includes a plurality of radiating elements  732 , a plurality of wiring patterns  733 , and a plurality of coaxial connectors  734 . 
     In the case of this modification, one end of each wiring pattern  733  is connected to the radiating element  732 , the other end of each wiring pattern  733  is connected to the coaxial connector  734 . Each of the wiring patterns  733  does not electrically connected each other and independent of each other. The signals sent from the respective radiating elements  732 , via the wiring pattern  733 , is sent to the respective coaxial connector  734  independently of the signals sent from the other radiating elements  732 . 
     In the present modification, the signal sent from each radiating element  732  is sent to the test head  32  independently of each other since the signal does not merge in the wiring pattern  733  and coaxial the connector  734 . This allows to measure the intensity of the detected radio waves for each radiating element  732 , in the OTA test, and to evaluate the directivity based on the distribution of the intensity. 
     In the case of the modification shown in  FIG. 7 , the test antenna  73  includes the same number of coaxial connectors  734  as the radiating elements  732  and the wiring patterns  733  but is not particularly limited thereto. For example, the test antenna  73  may include a single coaxial connector  734  and a switch interposed between the coaxial connector  734  and the  16  wiring patterns  733 . The testing apparatus  1  may perform the OTA test while switching the wiring patterns  733  that connects to the coaxial connector  734 . This allows to reduce the number of the connectors  734 . 
       FIG. 8  is a cross-sectional view showing a first modification of the top socket and the bottom socket according to the present embodiment,  FIG. 9  is a cross-sectional view taken along IX-IX of  FIG. 8  showing a first modification of the bottom socket according to the present embodiment. 
     The configuration of the bottom socket  70  is not particularly limited to the above, For example, as shown in  FIG. 8 , the DUT  10  may include a device antenna  12   a  provided on the side of the DUT  10  in addition to the device antenna  12  of the lower surface  11   b . In this case, as shown in  FIGS. 8 and 9 , the bottom socket  70  may include a test antenna  73   a  in addition to the test antenna  73 . The test antenna  73   a  is disposed substantially parallel to the lower surface  11   b  with respect to the device antenna  12   a . This allows to test the antenna  12   a  that radiates radio waves in a direction parallel to the lower surface  11   b . As such a device antenna  12   a , for example, a dipole antenna can be exemplified. The test antenna  73   a . is also electrically connected to the tester  3 , similarly to the test antenna  73  described above. The device antenna  12   a  in the present embodiment corresponds to an example of the “second device antenna” in this disclosure. 
     The bottom socket  70  may include only the test antenna  73   a  and not include the antenna  73  if the DUT  10  does not include the device antenna  12  and includes only the device antenna  12   a.    
     As shown in  FIG. 8 , a. test antenna  73   b  may be disposed on the wiring board  63  of the top socket  60  if the DUT  10  include a device antenna  12   b  on the surface opposite to the device antenna  12 . In this case, the body  61  includes the opening  613  so that the test antenna  73 h faces the device antenna  12 . This allows to perform the OTA test for each device antenna provided on both sides of the substrate  11 . 
     Returning to  FIG. 4 , the attenuation member  74  is provided inside the opening  712  of the base  71  and interposed between the test antenna  73  and the device antenna  12 . The attenuation member  74  is a sheet-like member made of a material capable of absorbing radio waves, particularly millimeter waves. As the material of the attenuation member  74 , the same material as the material constituting the radio wave absorbing material used for the inner wall of the radio wave dark room can be used, and specifically, ferrite, a resin material, and the like can be exemplified. Changing the content and the dielectric constant of the wave absorbing material of the attenuation member  74  may adjust the amount of attenuation of the radio wave by the attenuation member  74 . Adjusting the thickness of the attenuation member  74  may adjust the amount of the attenuation of radio waves. 
     The attenuation member  74  is provided inside the opening  712  of the base  71  to face the radiating elements  732  of the test antenna  73 , in the present embodiment, the attenuation member  74 , in a plan view (when viewed along the vertical direction), closes the opening  712  and covers the entire surface of the radiating elements  732 . The attenuation member  74 , in a state where the DUT  10  is in contact with the base  71 , is disposed so as to face the device antenna  12  of the DICT  10 , and is disposed so as to be interposed between the radiating elements  732  and the device antenna  12 . 
     Although not particularly shown, in the present embodiment, the attenuation member  74  is fitted into a. groove formed on the inner surface of the three sides of the opening  712  and is connected to the fixing member via an opening formed in the remaining one inner surface. Screwing the fixing member to the outer surface of the base  71  fixes the attenuation member  74  to the base  71 . Alternatively, an adhesive may be used to fix the attenuation member  74  to the base  71 . 
     The attenuation member  74  interposed between the radiating elements  732  and the device antenna  12 , while maintaining the distance on the radio communication between the test antenna  73  and the device antenna  12 , allows to shorten the actual distance between the test antenna  73  and the device antenna  12 . This allows to reduce the size of the socket  5 . 
     Further, the attenuation member  74  interposed between the radiating elements  732  and the device antenna  12 , while maintaining the actual distance between the test antenna  73  and the device antenna  12 , also allows to increase the distance on the radio communication between the test antenna  73  and the device antenna  12 . This allows to restrain the test antenna  73  and the device antenna  12  from interfering with each other to deteriorate the accuracy of the test. 
       FIG. 10  is a cross-sectional view showing a second modification of the bottom socket according to the present embodiment. 
     The bottom socket  70 , as shown in  FIG. 10 , may include an attenuation member  74   a  provided on the inner surface of the opening  712  and a shield layer  75  provided on the outer surface of the base  71 . The attenuation member  74   a  in the present embodiment corresponds to an example of the “second attenuation member” or “second attenuation sheet,” and the shield layer  75  in the present embodiment corresponds to an example of the “shield layer,” in this disclosure. 
     The attenuation member  74   a  attenuates the radio waves radiated from the device antenna  12  or the test antenna  73  and suppress the reflection of the radio waves. This allows to improve the accuracy of the test. The attenuation member  74   a  is composed of the same material as the attenuation member  74 . 
     The shield layer  75  is provided on the outer surface of the base  71 , that is, the DUT  10  is surrounded by the shield layer  75  when the DUT  10  contacts the surface  711  of the base  71 . This allows to shield the radio waves from the outside, thus, to improve the accuracy of the test. 
     Instead of providing the shield layer  75 , the base  71  may have a radio wave blocking function itself by constituting the base  71  with a conductive material such as a metal, in this case, an insulator is interposed between the inner surface of the holes  713  of the base  71  and the pins  72 . 
     Hereinafter, the OTA test of the DUT  10  by the electronic component testing apparatus  1  in the present embodiment will be described with reference to FIGS,  2  to  4 . 
     First, starting the chamber  20 , adjusting the temperature in the chamber  20  to a predetermined temperature. 
     Next, as shown in  FIG. 2 , the contact chuck  22  of the handler  2  moves by the contact arm  21  right above the DUT  10 . Thereafter, the contact chuck  22  goes down toward the DUT  10 , the pogo pins  62  of the top socket  60  contact the input and output terminals  14  of the DUT  10 , the suction pad  25  contacts the DUT  10 . At this time, the DUT  10  is held in the contact chuck  22  in a posture inverted from the normal posture (in which the input-output terminal  14  faces upward). 
     Next, by sucking air from the suction pipe  24 , the contact chuck  22  sucks and holds the DUT  10 . Then, as shown in  FIG. 3 , the DUT  10  moves right above the bottom socket  70  by the arm  21 . 
     Then, as shown in  FIG. 4 , the chuck  22 . goes down by the arm  21  to press the DUT  10  against the bottom socket  70 . Thus, the lower surface  11   b  of DUT 10  contacts the surface  711  of the base  71  and the device antenna  12  faces the test antenna  73 . Also, at the same time the pogo pins  72  of the bottom socket  70  contact the pads  632  of the top socket  60 , the DUT  10  is electrically connected to the test head  32  via the bottom socket  70  and the top socket  60 . 
     Then, while pressing the top socket  60  to the DUT  10  with pressing the DUT  10  to the bottom socket  70 , the testing apparatus  1  performs the following test for determining the radio wave reception characteristics of the DUT  10 . 
     Specifically, first, the test signal outputted from the main frame  31  is sent to the DUT  10  through the conductive path  41  of the load board  4  mounted on the test head  32 , the pogo pins  72 , the conductive path  631 , and the pogo pins  62 . Then, the DUT  10  receiving the test signal radiates radio waves downward from the device antenna  12 . This radio wave is received by the test antenna  73 , is converted into an electric signal, and is sent to the main frame  31  via the coaxial connector  734 . The radio wave radiation properties of the DUT  10  is evaluated based on the signal. 
     Then, while keeping the DUT  10  pressed against the bottom socket  70 . the test signal outputted from the main frame  31  is sent to the test antenna  73  via the coaxial connector  734 . The test antenna  73  which has received the test signal radiates radio waves upward. This radio wave is received by the device antenna  12 , is converted into an electric signal, and is sent to the main frame  31  via the top socket  60 , the bottom socket  70 , and the load board  4 . The radio wave reception characteristics of the DUT  10  is evaluated based on the signal. 
     After the DUT  10  has been evaluated, the contact arm  21  moves upwards and the DUT  10  moves away from the bottom socket  70 . This completes the DUT  10  test. 
     As described above, in this embodiment, the bottom socket  70  for holding the DUT  10  includes the antenna  73  disposed to face the device antenna  12  of the DUT  10 . Contacting of the lower surface  11   b  of the DUT  10  with the surface  711  of the bottom socket  70  positions the device antenna  12  and the test antenna  73  such that the radio waves from the device antenna  12 , reach the test antenna  73  in near-field. This allows to perform the OTA test in near-field. 
     If the contact chuck of the handier includes the test antenna, a detachable connector is interposed between the test antenna and the test head. Attaching and detaching the connector every time the test may impair the connection reliability. 
     In contrast, in the present embodiment, the test antenna  73  is disposed on the bottom socket  70  on the load board  4  and is electrically connected to the test head  32  via the coaxial connector  734 . This allows to stably transmit the signal to the tester  3 , thus improve the accuracy of the test. 
     Furthermore, in this embodiment, the attenuation member  74  interposed between the test antenna  73  and the device antenna  12 , while maintaining the distance on the radio communication between the test antenna  73  and the device antenna  12 , shortens the actual distance between the test antenna  73  and the device antenna  12 . This allows to reduce the size of the socket  5 . 
       FIG. 11  is a cross-sectional view showing a modification of the electronic component testing apparatus according to the present embodiment, 
     In the present embodiment, the testing apparatus  1  includes the handler  2 , but the electronic component testing apparatus  1  may be a so-called manual type testing apparatus that does not include the handler  2 . In this case, as shown in  FIG. 11 , the top socket  60  includes a socket cover  64  that is fitted to the bottom socket  70 , the base  71  includes a recess  714  for engaging the socket cover  64 . The socket cover  64  includes a latch  641  for engaging the recess  714 . Engaging the latch  641  and the recess  714  fixes the top socket  60  to the bottom socket  70 . The socket cover  64  makes it possible to fix the top socket  60  to the bottom socket  70  without using the handler  2  and press the DUT  10  against the bottom socket  70 . This makes the device antenna  12  to face the test antenna  73  and electrically connect the top socket  60  to the bottom socket  70 , thus, perform the OTA test in near-field. 
     The Second Embodiment 
       FIG. 12  is a schematic cross-sectional view showing the overall configuration of the electronic component testing apparatus according to the present embodiment, 
     The electronic component testing apparatus  113  according to the present embodiment differs from the first embodiment in the configuration of the load board  4 B, the top socket  60 B, and the bottom socket  70 B, but is otherwise similar. Hereinafter, only the different components between the electronic component testing device  113  in the second embodiment and the first embodiment will be described. The same components as those in the first embodiment are assigned to the same reference numerals and omit the descriptions, 
     The load board  4 B in the present embodiment, as shown in  FIG. 12 , includes an opening  43  in which the bottom socket  70 B is fitted. Through the opening  43 , the DUT  10  held by the contact chuck  22  can contact the bottom socket  70 B. The opening  43  in the present embodiment corresponds to an example of the “first opening” or “board opening” in this disclosure. 
       FIG. 13  is an enlarged cross-sectional view of XIII portion of  FIG. 12  showing pressing the DUT to the socket according to the present embodiment,  FIG. 14  shows pressing the DUT to the socket according) the present embodiment and corresponds to  FIG. 13 ,  FIG. 15  is an enlarged cross-sectional view of the XV portion of  FIG. 13 . 
     The top socket  60 B, as shown in  FIG. 13 , includes pogo pins  65  provided corresponding to the pads  42  of the load board  4 B. The pogo pins  65 , as shown in  FIG. 15 , are disposed inside the through holes  612  of the body  61 B, held in the body  61 B, and in contact with the pads  632 . The pogo pins  65  contact the pads  42 b:, 7  contacting of the DUT  10  with the bottom socket  70 B (refer to  FIG. 14 ) and allows to electrically connect the top socket  60 B to the load board  4 B. 
     As shown in  FIG. 13 , the bottom socket  70 B are embedded in the load board  4 B and the test head  32 . The bottom socket  70 B is exposed from the load board  4 B through the opening  43 . This allows the test antenna  73  to face the device antenna  12  through the opening  43 . 
     The bottom socket  70 B, unlike the bottom socket in the first embodiment, does not include a pogo pin electrically connected to the tester  3 . In the present embodiment, the test signal sent from the tester  3  is transmitted from the pads  42  of the load board  4 B to the DUT  10  via the pogo pins  65  of the top socket  60 B, not via the bottom socket  70 B. In the present embodiment, the load board  4 B is also replaced in accordance with a change in the type of the DUT  10 , in addition to the top socket  60 B and the bottom socket  70 B. That is. the socket  5 B is composed of the top socket  60 B, the bottom socket  70 B and the load board  4 B. The load board  4 B is detachably fixed to the test head  32  via a connector or the like. 
     The testing apparatus  1 B can perform the OTA test of the DUT  10  in the same manner as the OTA test in the first embodiment. In the present embodiment, the test signal sent from the tester  3  is transmitted to the DUT  10  through the test head  32 , the load board  4 B, and the top socket  60 B. 
     As described above, in the present embodiment, the bottom socket  70 B for holding the DUT  10  includes a test antenna  73  disposed to face the device antenna  12 . Contacting of the lower surface  11   b  with the surface  711  positions the device antenna  12  and the test antenna  73  such that the radio waves from the device antenna  12  reach the test antenna  73  in near-field. This allows to perform the OTA test in near-field. 
     Further, similarly to the first embodiment, the attenuation member  74  interposed between the test antenna  73  and the device antenna  12 , while maintaining the distance on the radio communication between the test antenna  73  and the device antenna  12 , allows to relatively shorten the actual distance between the test antenna  73  and the device antenna  12 . This allows to reduce the size of the socket  5 B. 
     Embodiments heretofore explained are described to facilitate understanding of the present invention and are not described to limit the present invention. It is therefore intended that the elements disclosed in the above embodiments include all design changes and equivalents to fall within the technical scope of the present invention. 
     For example, in the above-described embodiments, the electronic component testing apparatus tests both the radio wave emission characteristic and the radio wave reception characteristic of the DUT, but in some embodiments, the electronic component testing apparatus may test only one of the radio wave emission characteristic and the radio wave reception characteristic of the DUT as a test of the DUT. 
     Although the disclosure has been described with respect to only a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that various other embodiments may be devised without departing from the scope of the present invention. Accordingly, the scope of the invention should be limited only by the attached claims, 
     EXPLANATIONS OF LETTERS OR NUMERALS 
       1 , 1 B . . . Electronic component testing apparatus 
       2  . . . Handler 
       20  . . . Thermostatic chamber 
       21  . . . Contact arm 
       22  . . . Contact chuck 
       23  . . . Adsorption mechanism 
       24  . . . Suction pipe 
       25  . . . Suction pad 
       26  . . . Vacuum pump 
       3  . . . Tester 
       31  . . . Main frame 
       32  . . . Test head 
       33  . . . Cable 
       4 , 4 B . . . Load board 
       41  . . . Conductive path 
       42  . . . Pad 
       43  . . . Opening 
       5 , 5 B . . . Socket 
       60 ,  60 B . . . Top socket 
       61  . . . Body 
       611  . . . Holding hole 
       612  . . . Through hole 
       613  . . . Opening 
       62  . . . Pogo pin 
       63  . . . Wiring board 
       631  . . . Conductive path 
       632  . . . Pad 
       64  . . . Socket cover 
       65  . . . Pogo pin 
       70 ,  70 B . . . Bottom socket 
       71 , 71  . . . Base 
       711  . . . Surface 
       712  . . . Opening 
       713  . . . Holding hole 
       714  . . . Recess 
       72  . . . Pogo pin 
       73 ,  73   a ,  73   b  . . . Testa 
       731  . . . Substrate 
       732  . . . Radiating element 
       733  . . . Wiring pattern 
       734  . . . Coaxial connector 
       735  . . . Coaxial cable 
       74 ,  74   a  . . . Attenuation member 
       75  . . . Shield layer 
       10  . . . DUT 
       12 ,  12   a ,  12   b  . . . Device antenna 
       13  . . . Semiconductor chip 
       14  . . . Input-output terminal