KR102523642B1 - shield box for testing mobile telecommunication terminal - Google Patents

Abstract

The present invention relates to a shield box for testing a mobile telecommunication terminal, which has an RF coupler that supports multiple input and output in a contactless way to perform various tests for a mobile telecommunication terminal having a multiple antenna by an over-the-air (OTA) method. The shield box for testing a mobile telecommunication terminal of the present invention comprises: a shield box body that is made of a metal material and has a front surface formed with a jig entrance; and a jig assembly that is installed to be able to enter or exit through the jig entrance while having a mounted RF coupling PCB in which a plurality of RF couplers are arranged by a capacitive coupling method with a transmission line structure, in which only signals in a near field are transmitted.

Description

Shield box for testing mobile telecommunication terminal}

The present invention relates to a shield box for testing mobile communication terminals, and in particular, contains an RF coupler supporting multiple inputs and outputs of a non-contact method so that various tests for mobile communication terminals having multiple antennas can be performed in an Over The Air (OTA) method. It relates to a shield box for testing a mobile communication terminal.

Recently, as mobile communication terminals use multiple antennas (hereinafter referred to as 'multiple antennas') to increase channel capacity as well as antennas supporting multiple bands in line with various communication environments, OTA (Over The Air) test This is the preferred trend.

When a mobile communication terminal uses an OTA channel for testing protocols and various functions, two methods are used: a method of transmitting and receiving signals using an antenna and a method of transmitting and receiving signals using a near-field coupler. Both of these methods use a shield room or a shield box to block external interference to the mobile communication terminal. In the case of a relatively large-scale shield room, the space cost is high, so the shield box is Commonly used.

On the other hand, when an antenna, for example, a patch antenna is installed and used inside the shield box, the level of the signal transmitted and received by the mobile communication terminal varies greatly depending on the position of the antenna and the location of the mobile communication terminal, which affects the data transmission speed. It has a big impact.

The following prior art 1 is a prior patent invention of the present applicant, and is largely a metal box, embedded in the metal box, located directly above or directly below the antenna part of the mobile communication terminal housed in the metal box, and signals from the mobile communication terminal antenna. A first radio wave that is attached to the entire inner surface of the metal box except for the terminal accommodating space having the same size as the probe antenna and the mobile communication terminal that receives the signal in a non-contact manner and prevents radio waves emitted from the mobile communication terminal antenna from being reflected inside the metal box. Disclosed is a shield box for testing a wireless terminal comprising an absorber and a second wave absorber attached to a probe antenna so as to be interposed between the probe antenna and the mobile communication terminal antenna.

Prior art 2 below is also a prior art patent invention of the present applicant, and can be used universally for various mobile communication terminals because the problem of prior art 1 is that the location and size of the probe antenna and radio wave absorber must be changed for each type of mobile communication terminal. It is proposed to solve the problem of not being able to

This prior art 2 cancels the interference component generated in the process of testing by connecting the mobile communication terminal with multiple antennas to the shield box wirelessly (non-contact) using signal processing technology, thereby canceling various types of mobile communication terminals with multiple antennas. Disclosed is an apparatus and method for canceling interference components for a test of a multi-antenna wireless device, which supports the test to be performed simply and with high reliability.

The prior art 3 below is also a prior patent application invention of the present applicant, and is disposed in the right place of a shield box accommodating a mobile communication terminal, a plurality of probe antennas disposed inside the shield box, and a shield box, but corresponding to the probe antenna one-to-one or many-to-one. Disclosed is a wireless connection device for a terminal having multiple antennas that includes a provided RF connector and performs wireless communication with terminal antennas using probe antennas equal to or greater than the number of terminal antennas of a mobile communication terminal.

However, prior arts 1 to 3 described above are conceptual inventions for a shield box that is connected to a mobile communication terminal in a non-contact (wireless) manner and performs various tests on the mobile communication terminal, which can test various mobile communication terminals. Since it has poor versatility and has a closed structure to block radio interference outside the shield box, the temperature of the mobile communication terminal continuously rises as the test progresses.

Prior Art 1: Registered Patent Publication No. 10-1689530 (Title of Invention: Shield Box for Wireless Terminal Test)

Prior Art 2: Registered Patent Publication No. 10-2129268 (Title of Invention: Apparatus and method for canceling interference components for testing multi-antenna wireless device)

Prior art 3: Publication No. 10-2020-0144010 (title of invention: wireless connection device for a terminal having multiple antennas)

The present invention has been devised to solve the above problems, and has a built-in RF coupler that supports multiple inputs and outputs of a non-contact method so that various tests for a mobile communication terminal having multiple antennas can be performed in an Over The Air (OTA) method. Its purpose is to provide a shield box for testing a mobile communication terminal.

In order to achieve the above object, the shield box for testing mobile communication terminals is made of metal and consists of a shield box main body having a jig entrance and exit formed on the front side and a plurality of capacitive coupling type RF couplers consisting of a transmission line structure in which signals are transmitted only in the near field. It includes a test jig assembly installed to be able to enter and exit through the jig entrance while mounting the arranged RF coupling PCB.

In the above configuration, the RF coupling PCB is made of a PCB having a Coplanar Waveguide with Ground (CPWG) structure in which ground is disposed on top and bottom of a dielectric.

On the upper surface of the RF coupling PCB, an RF coupler is arranged in a matrix form of two or more rows horizontally and two or more columns vertically and designed to maximize the distance between transmission lines to minimize inductive components between transmission lines, and the RF A power supply unit for supplying power to the RF coupler is disposed on a lower surface of the coupling PCB, and each of the RF couplers and each of the power supply unit are electrically connected through a via hole connection unit having a surface thereof made of a conductor.

The upper surface ground and the lower surface ground of the RF coupling PCB are connected to each other through a via hole, the surface of which is made of a conductor.

An intake port having a plurality of intake holes having a size of 1 to 10 mm is provided on the upper side of the shield box body, and an exhaust port having a plurality of exhaust holes having a size of 1 to 10 mm is provided on the rear side of the shield box body.

An intake fan is installed in the intake port, and an exhaust fan is installed in the exhaust port.

The upper half of the shield box body is made of metal and covered with an upper cover having a plurality of heat dissipation holes formed on at least one side of both side surfaces, and the lower half of the shield box body is made of metal and has a plurality of radiating holes on at least one side of both sides or the lower surface. It is covered with a lower cover in which a heat dissipation hole is formed, and a pedestal for separating the shield box from the bottom surface is installed at each corner of the lower surface of the lower cover.

The test jig assembly includes a jig frame on which the RF coupling PCB is mounted; A front panel mounted on the front of the jig frame and having an RF cable connector installed thereon; a PCB sheet installed on the jig frame and on which the RF coupling PCB is placed; A terminal interface box equipped with various interfaces with mobile communication terminals and a clamping means installed at the rear of the jig frame and firmly fixing mobile communication terminals of various sizes to a predetermined position of the jig frame by the elastic force of the compression spring. do.

The jig frame is formed of a non-metallic material having an opening through which the RF coupler is exposed and a terminal accommodating port in which a mobile communication terminal is accommodated.

A USB cable fixing groove in which a USB cable connected to a USB connection jack of a mobile communication terminal is fixed is formed in the jig frame at the center of the front surface of the terminal accommodating hole.

An audio cable fixing wall in which an audio cable connected to an audio connection jack of a mobile communication terminal is accommodated and fixed is formed on both sides of the terminal accommodating hole, and an inner side of the audio cable fixing wall presses to prevent the audio cable stored therefrom being separated. A bump is formed.

The PCB sheet is made of metal, and a cable passage groove through which an internal RF cable connecting the power supply unit and the RF cable connector passes is formed at a central portion.

A heat sink for dissipating heat from the PCB sheet is installed in the shield box body below the PCB sheet.

A radio wave absorber is installed on the lower surface of the shield box body.

A magnet is mounted on the heat sink without forming a step with the upper surface, and a magnetic material fixing groove into which a magnetic piece of iron having magnetism is inserted without a step is formed on the lower surface of the PCB sheet.

The front panel has an opening/closing handle for holding the test jig assembly by hand and moving it in and out of the shield box body and a spring inside to firmly fix the test jig assembly housed in the shield box body to the shield box body. A locking lever equipped with a clamping function for doing so is provided.

An RF coupler arrangement table indicating an arrangement position of each of the RF couplers is attached to the front panel.

Jig entry and exit guide members installed on both sides of the shield box body to guide entry and exit of the test jig assembly, and applying pressure to the jig entry and exit guide member in a state where the test jig assembly is accommodated inside the shield box body to maintain the correct position A holding spring plunger is further provided.

The terminal interface box is electrically connected to an audio jack and a USB jack of the mobile communication terminal, and includes an audio codec and a Bluetooth communication module for Bluetooth communication with the mobile communication terminal.

According to the shield box for testing a mobile communication terminal of the present invention, in testing a mobile communication terminal having multiple antennas, it has high coupling performance and can be applied to a MIMO channel, while providing an over-the-air (OTA) channel environment with minimized variability. By maintaining a constant temperature regardless of the external temperature environment, 5G interworking tests can be conducted without network switching for a long time.

1 is a perspective view of a shield box for testing a mobile communication terminal according to an embodiment of the present invention.
2a and 2b are front and rear views of the shield box for testing a mobile communication terminal shown in FIG. 1, respectively.
3 is an exploded perspective view of a shield box for testing a mobile communication terminal shown in FIG. 1;
4 is an exploded perspective view of a test jig assembly in a shield box for testing a mobile communication terminal shown in FIG. 1;
Figure 5 is a longitudinal cross-sectional view taken along line AA in Figure 1;
6 is a longitudinal cross-sectional view taken along line BB in FIG. 1;
7a and 7b are top and bottom views of an RF coupling PCB in a shield box for testing a mobile communication terminal of the present invention, respectively.
Figure 8 is an enlarged view of the top surface structure of one RF coupler in Figure 7a.
Figure 9 is an enlarged view of the lower surface structure of one RF coupler in Figure 7b.
10 is a three-dimensional view of a wiring structure of one RF coupler in a shield box for testing a mobile communication terminal according to the present invention;
11 is a diagram for explaining a cooling structure of a shield box for testing a mobile communication terminal according to the present invention;
12a to 12f are diagrams illustrating the use of the shield box for testing a mobile communication terminal according to the present invention, respectively.

Hereinafter, a preferred embodiment of a shield box for testing a mobile communication terminal according to the present invention will be described in detail with reference to the accompanying drawings.

An important factor in testing the protocol and function of a mobile communication terminal using an OTA channel is to maintain consistency so that the performance of a mobile communication terminal does not change due to external environments. The range of consistent performance is as follows.

l. Keeping the signal level transmitted and received by the mobile communication terminal constant by maintaining the path loss due to the wireless channel constant: The size of the signal transmitted and received by the mobile communication terminal is greatly influenced by the external test environment, that is, the external test environment. The angle and direction of the transmit/receive antenna, the angle and direction of the terminal antenna, and reflected waves sensitively change the size of the signal and have a great influence on the test result, so it is important to have an environment where consistent signals can be transmitted and received.

2. Preventing temperature rise of mobile communication terminals to prevent network switching or performance change due to temperature rise: Recently, mobile communication terminals supporting 5G communication have relatively increased heat generation compared to 4G communication due to data throughput and high output. , It is designed to automatically switch from 5G network to 4G network in case of severe heat. Accordingly, when the terminal is placed in an airtight shield box and the 5G network interworking test is performed, when the fever is severe, the network is automatically switched to the 4G network, making it difficult to conduct the 5G network interworking test for a long time. In addition, the temperature rise of the mobile communication terminal leads to deterioration of the RF signal, which has a great influence on obtaining consistent test results.

3. MIMO (Multiple-Input and Multiple-Output) selectively transmits and receives signals while maintaining low crosstalk performance: In general, when using a capacitive coupling method, SISO (Single-Input and Single-Output) type coupler is used, but in this case, there is no method for distinguishing MIMO signals for each channel of a mobile communication terminal adopting a MIMO antenna. Accordingly, when a plurality of antennas are installed around a mobile communication terminal, it is difficult to analyze a channel environment due to high crosstalk between antennas.

1 is a perspective view of a shield box for testing a mobile communication terminal according to an embodiment of the present invention, and FIGS. 2A and 2B are front and rear views of the shield box for testing a mobile communication terminal shown in FIG. 1, respectively.

3 is an exploded perspective view of the shield box for testing a mobile communication terminal shown in FIG. 1, and FIG. 4 is an exploded perspective view of a test jig assembly in the shield box for testing a mobile communication terminal shown in FIG. 5 is a longitudinal cross-sectional view taken along the line A-A in FIG. 1, and FIG. 6 is a longitudinal cross-sectional view taken along the line B-B in FIG.

As shown in FIGS. 1 to 6, the shield box for testing a mobile communication terminal of the present invention is largely made of metal and includes a rectangular parallelepiped-shaped shield box main body 180 having a jig entrance 180a formed on the front side, and a mobile communication terminal. Test jig assembly 200 installed to be accessible through the jig entrance 180a of the shield box body 180 while mounting the RF coupling PCB 240 in which a plurality of RF couplers 241 for wireless (OTA) testing are arranged ), including

In the configuration described above, the upper half of the shield box body 180 is covered with the upper cover 120 made of metal and having a plurality of heat radiation holes 120a formed thereon, for example, on both sides. The lower half of the shield box body 180 is also made of metal and is covered with a lower cover 110 having a plurality of heat dissipation holes 110a formed therein, for example, on both sides and the lower surface.

An intake port 120b is formed at an appropriate place, for example, on the upper surface of the upper cover 120, to which an intake fan 150 for sucking in external air is installed to dissipate heat inside the shield box main body 180. Reference numeral 121 denotes a carrying handle installed on the upper surface of the upper cover 120 to lift and move the shield box.

A pedestal, preferably a rubber pedestal 111, is installed at each corner of the lower surface of the lower cover 110 to separate the shield box from the bottom surface.

A front frame 130 physically contacting the test jig assembly is installed at the entrance of the jig of the shield box body, and clamping plates 131 are provided on both sides of the front frame 130 to clamp a locking lever 212 described later. has been Reference numeral 132 denotes an EMI gasket interposed between the jig entrance 180a of the shield box body 180 and the front frame 130 to meet the EMI (Electro Magnetic Interference) standard.

Next, the test jig assembly 200 is mounted on the front of the jig frame 220, the jig frame 220 on which the above-described RF coupling PCB 240 is mounted, and the RF cable connector 213 and the USB cable connector ( 215), etc. are installed, the PCB sheet 230 installed on the jig frame 220 and the RF coupling PCB 240 is placed, and the terminal interface box 260 equipped with various interfaces with the terminal An external device, for example, a test PC (not shown) in which a terminal test program is installed, a USB hub assembly 270 having a plurality of USB connectors connected to the terminal through a USB interface, and terminals of various sizes are jiged. It may include a clamping slide 250 that is firmly fixed to a predetermined position of the frame 220 .

The front panel 210 includes an opening/closing handle 211 for holding the test jig assembly 200 in and out of the shield box body 180, the plurality of RF cable connectors 213 and the USB cable connector 215 described above. and a locking lever 212 having a clamping function for firmly fixing the test jig assembly 200 housed in the shield box body 180 with a spring (not shown) therein. It is available.

Reference numeral 214 denotes an RF coupler arrangement table attached to the front panel 210 and indicating an arrangement position of each RF coupler 241 . Reference numeral 216 denotes an EMI gasket interposed between the front panel 210 and the front frame 130 to meet EMI standards.

The jig frame 220 may be formed of a non-metallic material, for example, a plastic injection molding material. The jig frame 220 has an opening through which the RF coupler 241 is exposed to form a terminal accommodating port 221 in which a terminal is accommodated. has been

On the other hand, depending on the manufacturer and type of product, mobile communication terminals have different sizes, especially vertical lengths. Clamping is provided on the rear side of the jig frame 220 so that various types of terminals can be firmly fixed inside the jig frame 220. A spring pocket 224 is formed in which a compression spring 251, preferably a coil spring, which maintains the slide 250 in a forward state is accommodated.

Reference numeral 252 denotes a spring pin inserted into the compression spring 251, 253 denotes a slide cover covering the clamping slide 250, and 254 denotes a terminal clamper that presses the terminal in direct contact with the terminal.

On the other hand, a USB cable fixing groove 223 is formed in the center of the front surface of the terminal accommodating port 221 of the jig frame 220 to fix a USB cable connected to a USB connection jack formed in the center of the horizontal part of the terminal. In this way, the shield box of the present invention can perform tests while firmly fixing mobile communication terminals of various sizes to a predetermined position inside the jig frame 220.

On both sides of the jig frame 220, an audio cable fixing wall 222 is formed in which the audio cable connected to the audio connection jack of the terminal is accommodated and fixed. A pressing protrusion 222a is formed to press so that it does not come off.

The RF coupling PCB 240 has a plurality of RF couplers 241 arranged in a 2*4 matrix on the upper surface, and ground is provided on the top and bottom of the dielectric to increase heat conduction efficiency through a wide ground. It adopts CPWG (Coplanar Waveguide with Ground) structured PCB.

7a and 7b are top and bottom views of an RF coupling PCB in a shield box for testing a mobile communication terminal according to the present invention, respectively. 8 is an enlarged view of the upper structure of one RF coupler in FIG. 7A, and FIG. 9 is an enlarged view of the lower structure of one RF coupler in FIG. 7B. 10 is a three-dimensional view of a wiring structure of one RF coupler in a shield box for testing a mobile communication terminal according to the present invention.

As shown in FIGS. 7 to 10, according to the shield box for testing mobile communication terminals of the present invention, a device-sized capacitive coupling method is applied to the upper surface 240a of the RF coupling PCB 240 to distinguish MIMO signals. By arranging the RF couplers 241 in a MIMO form, for example, in a 2*4 matrix form, the RF coupler 241 closest to each antenna of the plurality of terminal antennas transmits and receives signals between the terminals.

Unlike a radio wave radiator such as an antenna, the RF coupler 241 proposed in the present invention has a structure of a transmission line through which signals are transmitted only in the near field. Since it is not a radio wave radiator, multi-path and reflection The use of a radio wave absorber inside the shield box main body 180 for reducing effects and the like can be minimized.

Specifically, each RF coupler 241 arranged on the upper surface 240a of the RF coupling PCB of the present invention is designed to maximize the distance between transmission lines in order to minimize inductive components between transmission lines.

In addition, a port for feeding (hereinafter referred to as a 'feeding unit') 248 or a circuit chip, for example, a chip resistance for impedance matching (249 ) etc. cannot be mounted, so the power supply 248 and the chip resistor 249 are disposed on the lower surface 240b of the RF coupling PCB. Each RF coupler 241 of the upper surface of the RF coupling PCB 240a is formed on the signal wire 246 electrically connected to the power supply unit 248 on the lower surface of the RF coupling PCB 240b, and the via hole connection portion of which the surface is metal-plated It is electrically connected via (242).

Here, the power supply unit 248 and the RF cable connector 213 are electrically connected through an internal RF cable (not shown) provided in the jig frame 220 . The chip resistor 249 is also formed on the signal wire 246 while being mounted on the signal wire 246 formed on the lower surface 240b of the RF coupling PCB, and via the via hole connection part 242 whose surface is metal-plated, the RF coupling PCB It is electrically connected to each RF coupler 241 on the upper surface 240a.

Furthermore, for heat dissipation, the upper surface ground 243a and the lower surface ground 243b of the RF coupling PCB 240 are also interconnected through metal-plated via holes, so that heat generated from the terminal passes through the via holes for upper and lower ground connection. It is to be quickly released to the lower part of the RF coupling PCB 240 through the.

Reference numeral 244 denotes an insulator formed around each RF coupler 241 to insulate each RF coupler 241 from the upper surface ground 243a, and 245 corresponds to each RF coupler 241 on the upper side thereof. It shows the insulation part formed on the RF coupling PCB lower surface (240b).

The PCB sheet 230 on which the RF coupling PCB 240 is placed may be made of a metal, for example, an aluminum alloy having a relatively high yield strength and excellent processability while being lightweight. A cable passage groove 231a through which an internal RF cable connecting the power supply unit 248 and the RF cable connector 213 passes is formed. On the lower surface of the PCB sheet 230, a magnetic material fixing groove 230b into which the magnetic piece iron 231 having magnetism is inserted without a step is formed.

The terminal interface box 260 is electrically connected to the audio jack and USB jack of the mobile communication terminal. For example, the audio codec for the MOS test and Bluetooth communication with the mobile communication terminal inside the shield box main body 180 provide various data, For example, a Bluetooth module for exchanging DM (Diagnostic Monitoring) data and the like may be provided.

Reference numeral 271 denotes a box fixing bracket for fixing the terminal interface box 270, and 272 denotes a cable cover for covering various cables.

On the other hand, according to the present invention, the intake fan bracket mounting hole 180b to which the intake fan bracket 153 to which the intake fan 150 is fixed is mounted on the upper part of the shield box body 180 in order to quickly dissipate the heat generated by the mobile communication terminal during the test. ) is formed. The intake fan bracket 153 increases the flow rate according to Bernoulli's principle while minimizing the inflow of external jamming waves so that external air can quickly flow into the shield box body 180, for example, with a size of 1 to 10 mm. A plurality of intake holes 153a are formed. Reference numeral 151 denotes an intake fan safety net installed outside the intake fan 150 .

According to the present invention, the rear frame 140 is mounted on the open rear surface of the shield box body 180, and an exhaust port is formed in the rear frame 140. An exhaust fan bracket 163 to which the exhaust fan 162 is fixed is mounted on the outside of the rear frame 140 . The exhaust fan bracket 163 increases the flow rate according to Bernoulli's principle while minimizing the inflow of external jamming waves so that the air inside the shield box body 180 can be quickly discharged to the outside, for example, 1 to 10 mm A large number of exhaust holes 163a are formed. Reference numeral 161 denotes an exhaust fan safety net installed outside the exhaust fan 162, 160 denotes an exhaust fan cover covering the exhaust fan, and 160a denotes an exhaust port formed on the exhaust fan cover 160.

A radio wave absorber for preventing crosstalk between an RF coupler inside the shield box body 180 and a terminal antenna may be installed at appropriate places inside the shield box body 180, for example, on both sides and bottom, respectively. Numerals 170 and 171 denote these right and left radio wave absorbers, and 172 denotes a lower radio wave absorber. Reference numeral 173 denotes a radio wave absorber fixing pin for fixing the right radio wave absorber 170 and the left radio wave absorber 171 .

On the other hand, for rapid heat dissipation through the lower surface of the PCB sheet 230, the lower surface of the PCB sheet 230 is in physical contact with the heat sink 174 made of metal. For this purpose, the heat sink 174 ) is inserted into and exposed to the heat sink mounting hole (170a) is formed.

Furthermore, in order to bring the PCB sheet 230 into close contact with the heat sink 174 while the test jig assembly 200 is accommodated in the shield box body 180, the heat sink 174 includes a magnet 176 for adhering the PCB sheet. It is mounted without a step with the upper surface of the heat sink 174, and the magnetic piece iron 231 is pulled by the magnetic force of the magnet 176 for close contact, so that the PCB sheet 230 is in close contact with the heat sink 174.

11 is a diagram for explaining a cooling structure of a shield box for testing a mobile communication terminal according to the present invention. As shown in FIG. 11, according to the shield box for testing the mobile communication terminal of the present invention, the heat generated from the mobile communication terminal accommodated in the test jig assembly 200 is innumerably formed on the RF coupling PCB 240 for the ground connection After being transferred to the PCB sheet 230 through the via hole, it is transferred again to the heat sink 174 in physical contact with the PCB sheet 230 and discharged through the heat dissipation holes 110a and 110b of the lower cover 110. . In addition, the external air forcibly sucked into the shield box body 180 through the intake fan 150 formed on the upper part of the shield box body 180 dissipates heat from the shield box body 180 and the heat sink 174. By forcibly discharging the air through the exhaust fan 161 installed on the rear side of the body 180, the temperature inside the shield box body 180 is maintained at the same level as the outside temperature even during a long-term terminal test.

Reference numeral 190 denotes a jig entry/exit guide member provided on both sides of the shield box main body 180 to guide the entry/exit of the test jig assembly 200, and 175 indicates that the test jig assembly 200 is inside the shield box main body 180. It shows a spring plunger that applies pressure to the jig entry and exit guide member 190 in a stored state to hold it in place.

12a to 12f are diagrams illustrating the use of the shield box for testing a mobile communication terminal according to the present invention. As shown in FIG. 12A, in a state where the lock levers 212 installed on both sides of the front panel 210 are rotated 90 degrees to be in an OFF state, the opening and closing knobs 211 are opened and closed as shown in FIG. 12B. Open the jig frame 220 by pulling it forward.

Next, as shown in FIG. 12C, when the USB cable is connected to the mobile communication terminal and the terminal is pushed in, the compression spring 251 is compressed by the clamping slide 250, and then a forward force is applied to the terminal to make the terminal rigid. it is fixed In this state, as shown in FIG. 12D, after gently pressing the upper surface of the mobile communication terminal to bring the terminal into close contact with the jig frame 220, as shown in FIG. 12E, the jig frame 220 is pushed by the front panel 210. It is pushed into the shield box body 180.

Finally, as shown in FIG. 12F, while pressing the lock lever 212 to an ON state and rotating it 90 degrees, the RF connector is connected to a signal analyzer, channel simulator or base station equipment through an RF cable, and USB Connect the USB connector to the test PC through a cable to perform protocol tests or various functional tests on the mobile communication terminal.

On the other hand, the eight RF couplers 241 provided in the shield box for testing the mobile communication terminal of the present invention are electrically connected to the RF cable connector 213 provided on the front panel 210, so that the user can use the appropriate RF for the test situation. Ports can be selected and used, that is, the same number or more RF ports than the number of antennas of the terminal under test can be selected and used. For example, during a 4x4 MIMO test, users can connect and use 4 or more RF ports.

In addition, the location of the antenna of the mobile communication terminal may vary depending on the model of the terminal or the frequency band used. When the location of the antenna of the terminal under test is known, it is preferable to select a coupler closest to the antennas of the terminal, but in most cases Since the antenna position of the UE under test is not known, it is preferable to use RF couplers 1, 4, 5, and 8 (refer to the RF coupler arrangement table of FIG. 2A) by default.

On the other hand, if it is necessary to select the optimally located RF coupler 241, it can be selected based on the signal power measurement value of the terminal.

As the power source, DC power obtained by rectifying and smoothing commercial AC power may be used.

Although the preferred embodiments of the shield box for testing mobile communication terminals of the present invention have been described in detail, the present invention is not limited to the above-described embodiments and may be modified in various ways within the scope permitted by the technical spirit of the present invention. .

For example, only one of an intake fan and an exhaust fan may be provided while an intake hole or an exhaust hole is provided.

Terminology used herein is for describing the embodiments and is not intended to limit the present invention. The suffixes "module" and "unit" for the components used in the above description are given only in consideration of the ease of writing the specification, and do not themselves have a meaning or role distinct from each other.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as "comprise", "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or other features, numbers, steps, operations, components, parts, or combinations thereof, or any combination thereof, is not precluded from being excluded in advance.

Also, the term 'or' means an inclusive OR rather than an exclusive OR.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

110: lower cover, 110a, 110b: heat sink,
111: rubber support,
120: upper cover,
120a: heat sink, 120b: intake port,
121: carrying handle,
130: front frame, 131: clamping plate,
132: EMI gasket,
140: rear frame, 140a: exhaust port,
150: intake fan, 151: intake fan safety net,
153: intake fan bracket, 153a: intake hole,
160: exhaust fan cover, 160a: exhaust port,
161: exhaust fan safety net, 162: exhaust fan,
163: exhaust fan bracket, 163a: exhaust hole,
170: right radio wave absorber, 170a: heat sink mounting hole,
171: left radio wave absorber, 172: lower radio wave absorber,
173: radio wave absorber fixing pin, 174: heat sink,
175: ball plunger, 176: magnet for close contact,
180: shield box body, 180a: jig entrance,
180b: intake fan bracket mounting hole, 190: equipment entry and exit guide member,
200: test jig assembly, 210: front panel,
211: opening and closing handle, 212: locking lever,
213: RF cable connector, 214: RF coupler arrangement table,
215: USB cable connector; 216: EMI gasket;
220: jig frame, 221: terminal storage port,
222: audio cable fixing wall, 222a: compression protrusion,
223: USB cable fixing groove, 224: spring pocket,
230: PCB sheet, 230a: cable passage groove,
230b: magnetic body fixing groove, 231: magnetic body iron,
240: RF coupling PCB, 240a: PCB upper surface,
240b: If the PCB, 241: RF coupler,
242: via hole connection, 243a: upper surface ground,
243b: lower surface ground, 244: insulation,
245: isolation part, 246: signal wiring,
248: power supply, 249: chip resistance
250: clamping slide, 251: compression spring,
252: spring pin, 253: slide cover,
254: terminal clamper,
260: terminal interface box, 270: USB hub assembly,
271: box fixing bracket, 272: cable cover

Claims (19)

delete A shield box body made of metal and having a jig entrance formed on the front side;
A plurality of RF couplers of capacitive coupling method consisting of a transmission line structure in which signals are transmitted only in the near field of a mobile communication terminal placed as an inspection target are arranged. Installed so as to be accessible through the jig entrance while mounting the RF coupling PCB test jig assembly;
an intake fan installed in an intake port provided on the upper side of the shield box body to suck external air into the shield box;
An exhaust fan installed in an exhaust port provided on the rear side of the shield box body to discharge air inside the shield box,
The RF coupling PCB is made of a CPWG (Coplanar Waveguide with Ground) structure PCB in which ground is disposed on the upper and lower surfaces of the dielectric,
The upper surface ground is disposed around each transmission line while being electrically insulated by an upper surface insulating part,
An insulating portion having the same shape as that of each transmission line is formed on a lower surface of the dielectric directly below each transmission line,
The lower surface ground is disposed in an area other than the lower insulating portion of the lower dielectric surface,
The upper surface ground and the lower surface ground are interconnected through 10 or more heat dissipation via holes whose surfaces are made of a conductor. The method of claim 2,
On the upper surface of the RF coupling PCB, an RF coupler formed in a matrix of two or more rows horizontally and two or more columns vertically and designed to maximize the distance between transmission lines to minimize inductive components between transmission lines is disposed,
A power supply unit for supplying power to the RF coupler is disposed on a lower surface of the RF coupling PCB,
A shield box for testing a mobile communication terminal, characterized in that each of the RF couplers and each of the power supply units are electrically connected through a via hole connection portion having a surface thereof made of a conductor. delete According to claim 2 or 3,
A plurality of intake holes having a size of 1 to 10 mm are formed in the intake port,
A shield box for testing a mobile communication terminal, characterized in that a plurality of exhaust holes having a size of 1 to 10 mm are formed in the exhaust port. delete The method of claim 5,
The upper half of the shield box body is covered with an upper cover made of metal and having a plurality of heat dissipation holes formed on at least one side of both side surfaces,
The lower half of the shield box body is made of metal and is covered with a lower cover having a plurality of heat dissipation holes formed on at least one side of both sides or the lower surface,
A shield box for testing a mobile communication terminal, characterized in that a pedestal for separating the shield box from the bottom surface is installed at each corner of the lower surface of the lower cover. The method of claim 5,
The test jig assembly includes a jig frame on which the RF coupling PCB is mounted; A front panel mounted on the front of the jig frame and having an RF cable connector installed thereon; a PCB sheet installed on the jig frame and on which the RF coupling PCB is placed; A terminal interface box equipped with various interfaces with mobile communication terminals and a clamping means installed at the rear of the jig frame and firmly fixing mobile communication terminals of various sizes to a predetermined position of the jig frame by the elastic force of the compression spring. A shield box for testing a mobile communication terminal, characterized in that The method of claim 8,
The jig frame is made of an opening through which the RF coupler is exposed and is formed of a non-metallic material having a terminal accommodating port in which the mobile communication terminal is accommodated. The method of claim 9,
The mobile communication terminal test shield box, characterized in that the USB cable fixing groove in which the USB cable connected to the USB connection jack of the mobile communication terminal is fixed is formed in the jig frame at the center of the front surface of the terminal accommodating hole. The method of claim 9,
An audio cable fixing wall in which an audio cable connected to an audio connection jack of a mobile communication terminal is accommodated and fixed is formed on both sides of the terminal accommodating hole, and an inner side of the audio cable fixing wall presses to prevent the audio cable stored therefrom being separated. A shield box for testing a mobile communication terminal, characterized in that a protrusion is formed. The method of claim 8,
The PCB sheet is made of metal, and a cable passage groove is formed at a central portion through which an internal RF cable connecting the power supply unit and the RF cable connector passes. The method of claim 8,
A shield box for testing a mobile communication terminal, characterized in that a heat sink for dissipating heat of the PCB sheet is installed in the shield box body under the PCB sheet. The method of claim 13,
Characterized in that a radio wave absorber is installed on the lower surface of the shield box body
Shield box for testing mobile communication terminals. The method of claim 13,
A magnet is mounted on the heat sink without forming a step with the upper surface,
A shield box for testing a mobile communication terminal, characterized in that a magnetic material fixing groove into which a magnetic piece of iron having magnetism is inserted without a step is formed on the lower surface of the PCB sheet. The method of claim 13,
The front panel has an opening/closing handle for holding the test jig assembly by hand and moving it in and out of the shield box body and a spring inside to firmly fix the test jig assembly housed in the shield box body to the shield box body. A shield box for testing a mobile communication terminal, characterized in that it is provided with a locking lever equipped with a clamping function for The method of claim 13,
A shield box for testing a mobile communication terminal, characterized in that an RF coupler arrangement table indicating an arrangement position of each of the RF couplers is attached to the front panel. The method of claim 8,
Jig entry and exit guide members installed on both sides of the shield box body to guide entry and exit of the test jig assembly, and applying pressure to the jig entry and exit guide member in a state where the test jig assembly is accommodated inside the shield box body to maintain the correct position A shield box for testing a mobile communication terminal, characterized in that it further comprises a spring plunger for holding. The method of claim 8,
The terminal interface box is electrically connected to an audio jack and a USB jack of the mobile communication terminal, and a Bluetooth communication module for Bluetooth communication with the audio codec and the mobile communication terminal is provided.

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