CN117990998A - Furnace door and electromagnetic compatibility testing equipment - Google Patents

Abstract

The invention discloses a furnace door and electromagnetic compatibility testing equipment, wherein the furnace door is used for the electromagnetic compatibility testing equipment, and the furnace door comprises: the door frame is provided with an installation groove, and the bottom surface of the installation groove is provided with a first shielding ring; and the door body is arranged in the mounting groove, a second shielding ring is arranged on one side of the door body facing the bottom surface of the mounting groove, and the first shielding ring and the second shielding ring are elastic microwave shielding rings. The oven door provided by the technical scheme of the invention can shield microwaves in different frequency bands.

Description

Furnace door and electromagnetic compatibility testing equipment

Technical Field

The invention relates to the technical field of electronic equipment detection, in particular to a furnace door and electromagnetic compatibility testing equipment.

Background

Currently, an electromagnetic compatibility testing device needs to be provided with a furnace door to realize taking and placing of the device to be tested. The oven door comprises a door body, and choke teeth are adopted for shielding the door body in order to prevent microwave leakage in the testing process. However, the existing scheme has the disadvantage that once the size of the choke teeth is determined, only microwaves in a certain frequency band can be shielded, and microwave shielding in a plurality of different frequency bands cannot be simultaneously considered, so that certain limitation is caused on the test of the electromagnetic compatibility testing equipment.

Disclosure of Invention

The embodiment of the invention provides a furnace door and electromagnetic compatibility testing equipment.

The furnace door of the embodiment of the invention comprises:

the door frame is provided with an installation groove, and the bottom surface of the installation groove is provided with a first shielding ring; and

The door body is installed the mounting groove, the door body is towards one side of mounting groove bottom surface is equipped with the second shielding circle, first shielding circle with the second shielding circle is the microwave shielding circle that has elasticity.

In the furnace door of the electromagnetic compatibility testing equipment, the first shielding ring and the second shielding ring are arranged in the furnace door, and the first shielding ring and the second shielding ring are elastic microwave shielding rings, so that gaps between the door body and the door frame can be effectively filled, and the shielding function of microwaves in different frequency bands is realized.

In some embodiments, a bottom surface of the mounting groove is provided with a first receiving groove, and the first shielding ring is at least partially positioned in the first receiving groove.

In some embodiments, a second accommodating groove is formed in one side of the door body facing the bottom surface of the mounting groove, and the second shielding ring is at least partially located in the second accommodating groove.

In certain embodiments, the first shield ring comprises one of the following structures:

A metal mesh;

filling a wave-absorbing material with a metal net;

A metal spring plate.

In certain embodiments, the second shield ring comprises one of the following structures:

A metal mesh;

filling a wave-absorbing material with a metal net;

A metal spring plate.

In some embodiments, the equivalent circuit of the shielding gate formed by the furnace door is a parallel circuit of a leakage microwave source, a first impedance, a second impedance and a third impedance,

The first impedance is an impedance formed by a gap between the door body and the door frame;

the second impedance is the impedance formed by the second shielding ring;

the third impedance is an impedance formed by the first shielding ring.

In some embodiments, the slot comprises a first slot and a second slot, the first slot is perpendicular to the second slot, and the first impedance is a parallel impedance of an impedance formed by the first slot and an impedance formed by the second slot.

The electromagnetic compatibility test apparatus of an embodiment of the present invention includes:

the testing cavity is used for placing equipment to be tested and is provided with an opening;

the oven door of any of the above embodiments is rotatably connected to the test cavity for opening and closing the opening.

In the electromagnetic compatibility testing device, the oven door can shield microwaves so as to prevent the microwaves from propagating out of the testing cavity, so that the electromagnetic compatibility testing device can perform electromagnetic compatibility testing of different frequency bands on the device to be tested.

In some embodiments, the electromagnetic compatibility test apparatus further comprises:

The testing cavity is connected with an antenna, and the microwave transmitting assembly and the microwave receiving assembly are electrically connected with the antenna.

In some embodiments, the electromagnetic compatibility test apparatus includes a switch connecting the microwave transmitting assembly and the microwave receiving assembly, the switch configured to electrically connect the microwave transmitting assembly to the antenna, and the switch configured to switch between the microwave assembly and the antenna.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained from the structures shown in these drawings without the need for inventive effort to a person skilled in the art.

Fig. 1 is a schematic view of a structure of an oven door according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an equivalent circuit of a oven door shielding microwave according to an embodiment of the present invention;

FIG. 3 is an effect diagram of the oven door according to the embodiment of the invention taking different measures;

FIG. 4 is a schematic block diagram of an electromagnetic compatibility testing apparatus according to an embodiment of the present invention;

FIG. 5 is a schematic view of a structure of a related art oven door;

fig. 6 is another structural schematic view of a related art oven door.

The achievement of the object, functional features and advantages of the present invention will be further described with reference to the drawings in connection with the embodiments.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present invention, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. Either mechanically or electrically. Can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Referring to fig. 5 and 6, in the related art, the door body 42 of the small-sized metal cavity for electromagnetic interference is shielded by using the choke teeth 44, and as shown in fig. 5, the typical structure of the electromagnetic shielding oven door is shown, and the related art oven door mainly comprises the door body 42 and the choke teeth 44 with periodical distribution around. As shown in fig. 6, the door choke structure suppresses microwave leakage at the door gap by the impedance transformation characteristic of the door 42 and choke teeth 44, which are quarter wavelength transmission lines with the cavity front frame 50, g-i is a terminal short road surface, g-j to f-d are quarter wavelength, so that the impedance is infinite at a-b, i.e., open, and the impedance is transformed into short circuit through quarter wavelength at h-i, so that even if there is a 1mm gap between h-i and a-b, it is sealed from the microwave perspective and does not leak outwards, which is the working principle of the existing door 42 for sealing microwaves. Additionally, 48 in fig. 6 indicates the location of the cavity.

However, the disadvantage of the above solution is that once the size of the choke teeth 44 is determined, only one frequency band of microwaves can be shielded according to the quarter-wavelength principle, and the shielding of microwaves in a plurality of different frequency bands cannot be simultaneously achieved.

Referring to fig. 1, an embodiment of the present invention proposes a furnace door 10 that can be used for electromagnetic compatibility testing equipment.

In some embodiments of the present invention, the oven door 10 comprises:

the door frame 12 is provided with a mounting groove 20, and the bottom surface of the mounting groove 20 is provided with a first shielding ring 16; and

The door body 14 is installed in the installation groove 20, and one side of the door body 14 facing the bottom surface of the installation groove 20 is provided with a second shielding ring 18, and the first shielding ring 16 and the second shielding ring 18 are elastic microwave shielding rings.

In the oven door 10 of the above embodiment, the first shielding ring 16 and the second shielding ring 18 can effectively fill the gaps between the door body 14 and the door frame 12, so as to realize the shielding function of the oven door 10 to microwaves of different frequency bands; the oven door 10 can be used for an electromagnetic compatibility test apparatus, so that microwaves inside the electromagnetic compatibility test apparatus can be prevented from being transmitted outwards through gaps of the oven door 10, and since the oven door 10 can shield microwaves of different frequency bands, the electromagnetic compatibility test apparatus can perform electromagnetic compatibility tests of different frequency bands without microwave leakage.

Specifically, the door frame 12 is rotatably connected with a testing cavity of the electromagnetic compatibility testing device, the door body 14 is fixedly connected with the door frame 12, and the testing cavity is arranged in the testing cavity for placing the device to be tested. The device under test may include, but is not limited to, a chip, a circuit board, and the like.

The mounting groove 20 is provided in the door frame 12, and the mounting groove 20 may be a sink groove provided in the door frame 12, and the first shielding ring 16 is provided at a bottom wall of the mounting groove 20 and may be provided near a side wall of the mounting groove.

The size and shape of the door 14 are adapted to the size and shape of the mounting slot 20 so that the door 14 can be better installed in the mounting slot 20. The door 14 may be fixedly coupled to the door 12 by screws, welding, or the like.

The surface of the door body 14 facing the bottom wall of the installation groove 20 is provided with the second shielding ring 18, and is matched with the first shielding ring 16 so as to effectively fill the gap between the door frame 12 and the door body 14, and the first shielding ring 16 and the second shielding ring 18 are elastic microwave shielding rings, so that the beneficial effects of effectively shielding microwaves in different frequency bands can be realized. It should be noted that the microwave shielding performance of the first shielding ring 16 and the second shielding ring 18 may be achieved according to the structure and/or the material properties thereof. For example, the material of the first shielding ring 16 and the second shielding ring 18 may be a metallic material, and/or a wave absorbing material.

Alternatively, in the present embodiment, the first shielding ring 16 and the second shielding ring 18 may be disposed along the entire circumference of the door frame 12, so that microwaves may be shielded in the entire circumference of the door frame 12 to improve the microwave shielding effect of the oven door 10.

It should be noted that fig. 1 only shows a part of the structure of the oven door 10. For example, only a portion of the door body 14, the door frame 12 is shown.

In some embodiments, the bottom surface of the mounting slot 20 is provided with a first receiving slot 22, and the first shielding collar 16 is at least partially positioned in the first receiving slot 22.

In this way, the positioning and mounting of the first shielding ring 16 can be facilitated, and the mounting stability of the first shielding ring 16 can be improved.

Specifically, the first receiving groove 22 is disposed along the bottom wall surface of the mounting groove 20, and optionally, the first receiving groove 22 is formed by milling, stamping or integrally forming. When the first shielding ring 16 is installed, the position of the first accommodating groove 22 is aligned, the first shielding ring 16 is placed into the first accommodating groove 22, and the groove wall of the first accommodating groove 22 can limit the first shielding ring 16, so that the first shielding ring 16 is installed more firmly. Alternatively, the first shielding collar 16 may be secured to the first receiving slot 22 by, but not limited to, adhesive.

When the door body 14 is closed on the door frame 12, a certain gap exists between the door body 14 and the door frame 12 due to tolerance problem, and the first shielding ring 16 is arranged in the first accommodating groove 22 and can shield microwaves propagating through the gap; further, a part of the first shielding ring 16 may extend into the slit to shield microwaves of different frequency bands, and may enhance the shielding effect; further, the first shielding ring 16 may extend into the slit until contacting the door body 14 or a structure provided on the door body 14, thereby shielding microwaves of different frequency bands and enhancing shielding effect.

It will be appreciated that in other embodiments, the bottom surface of the mounting groove 20 may not be provided with the first receiving groove 22, but may be a plane as a whole, and the first shielding ring 16 may be protruded on the plane.

In some embodiments, the door 14 is provided with a second receiving groove 24 on a side facing the bottom surface of the mounting groove 20, and the second shielding ring 18 is at least partially positioned in the second receiving groove 24.

In this way, the positioning and mounting of the second shielding ring 18 can be facilitated, and the mounting stability of the second shielding ring 18 can be improved.

Specifically, the second receiving groove 24 is disposed along the circumferential direction of the door body 14, and the second receiving groove 24 is disposed corresponding to the bottom wall surface of the mounting groove 20, and optionally, the second receiving groove 24 is processed by milling, stamping or integrally forming. When the second shielding ring 18 is installed, the position of the second accommodating groove 24 is aligned, the second shielding ring 18 is placed into the second accommodating groove 24, and the groove wall of the second accommodating groove 24 can limit the second shielding ring 18, so that the second shielding ring 18 is installed more firmly. Alternatively, the second shielding collar 18 may be secured to the second receiving slot 24 by, but not limited to, adhesive.

When the door body 14 is closed on the door frame 12, a certain gap exists between the door body 14 and the door frame 12 due to tolerance problem, and the second shielding ring 18 is installed in the second accommodating groove 24, which can shield microwaves propagating through the gap; further, a part of the second shielding ring 18 may extend into the slit to shield microwaves of different frequency bands, and may enhance the shielding effect; further, the second shielding ring 18 may extend into the slit until it contacts the door frame 12 or a structure provided on the door frame 12, thereby shielding microwaves of different frequency bands and enhancing shielding effect.

It will be appreciated that in other embodiments, the bottom surface of the door 14 may not have the second receiving groove 24, but may be generally planar, and the second shielding ring 18 may be disposed to protrude above the planar surface.

In certain embodiments, the first shielding collar 16 comprises one of the following structures:

A metal mesh;

the metal mesh is filled with a wave-absorbing material 28;

Metal spring 26.

In this way, the effect of the first shielding ring 16 having the microwave shielding performance can be achieved.

Specifically, in one embodiment, the first shielding collar 16 comprises a metal mesh, which is understood to have microwave shielding properties. Optionally, the material of the metal mesh may be, but not limited to, gold, silver, copper, iron, stainless steel, tin or lead, and the structural parameters of the metal mesh are based on satisfying the purpose of microwave shielding. It will be appreciated that the metal mesh has mesh openings which can reduce the material required for its manufacture and is lightweight.

In one embodiment, the first shielding collar 16 includes a metallic mesh filled wave-absorbing material 28, and the metallic mesh filled wave-absorbing material 28 may enhance microwave shielding performance. Optionally, the material of the wave-absorbing material 28 may be, but not limited to, graphene, graphite, carbon black, carbon fiber, carbon nanotube, ferrite, magnetic iron nanomaterial, silicon carbide, or the like, and the material of the wave-absorbing material 28 is selected so as to satisfy the effect of shielding microwaves.

In one embodiment, the first shielding collar 16 includes a metal dome 26, and it is understood that the metal dome 26 has a microwave shielding property. Optionally, the material of the metal spring 26 may be, but not limited to, gold, silver, copper, stainless steel, iron, tin or lead, and the structural parameters of the metal spring 26 are determined to satisfy the effect of shielding microwaves. It can be appreciated that the metal spring 26 has a strong structural strength, is not easily broken, and has a long service life. In the embodiment shown in fig. 1, the first shield ring 16 includes a metal spring 26.

However, the present design is not limited to this, and in other embodiments, the first shielding ring 16 is not limited to the above-described structure.

In certain embodiments, the second shielding collar 18 comprises one of the following structures:

A metal mesh;

the metal mesh is filled with a wave-absorbing material 28;

Metal spring 26.

In this way, the effect of the second shielding ring 18 having the microwave shielding performance can be achieved.

Specifically, in one embodiment, the second shielding collar 18 comprises a metal mesh, which is understood to have microwave shielding properties. Optionally, the material of the metal mesh may be, but not limited to, gold, silver, copper, iron, stainless steel, tin or lead, and the structural parameters of the metal mesh are based on satisfying the purpose of microwave shielding. It will be appreciated that the metal mesh has mesh openings which can reduce the material required for its manufacture and is lightweight.

In one embodiment, the second shielding collar 18 includes a metallic mesh filled wave-absorbing material 28, and the metallic mesh filled wave-absorbing material 28 may enhance microwave shielding performance. Optionally, the material of the wave-absorbing material 28 may be, but not limited to, graphene, graphite, carbon black, carbon fiber, carbon nanotube, ferrite, magnetic iron nanomaterial, silicon carbide, or the like, and the material of the wave-absorbing material 28 is selected so as to satisfy the effect of shielding microwaves. In the embodiment shown in fig. 1, the second shielding collar 18 includes a metallic mesh filled wave absorbing material 28.

In one embodiment, the second shielding collar 18 includes a metal dome 26, and it is understood that the metal dome 26 has a microwave shielding property. Optionally, the material of the metal spring 26 may be, but not limited to, gold, silver, copper, stainless steel, iron, tin or lead, and the structural parameters of the metal spring 26 are determined to satisfy the effect of shielding microwaves. It can be appreciated that the metal spring 26 has a strong structural strength, is not easily broken, and has a long service life.

However, the present design is not limited to this, and in other embodiments, the second shielding ring 18 is not limited to the above-described structure.

Referring to fig. 3, the shielding effect of the oven door 10 is shown by the lines in fig. 3 when different shielding measures are taken in the embodiment of the present invention. It can be understood that the metal net, the wave absorbing material and the metal spring plate 26 are added, and even if the simple door body 14 is adopted, the shielding effect in the frequency range of 0-9 GHz can reach the shielding effect of more than-20 dB, so that the shielding index requirement of the oven door 10 of the electromagnetic compatibility testing equipment is completely met, and the microwave interference and radiation test in the frequency range of 0-9 GHz can be performed in the same cavity.

Referring to fig. 2, in some embodiments, the shielded gate equivalent circuit formed by the oven door 10 is a parallel circuit of a leaky microwave source, a first impedance 36, a second impedance 38 and a third impedance 40,

Wherein the first impedance 36 is an impedance formed by a gap between the door body 14 and the door frame 12;

the second impedance 38 is the impedance formed by the second shielding ring 18;

The third impedance 40 is the impedance formed by the first shielding ring 16.

Thus, the oven door 10 can shield microwaves of a plurality of different frequency bands.

Specifically, the gap between the door body 14 and the door frame 12 may form a first impedance 36, and may absorb microwaves. The second shielding collar 18 may form a second impedance 38 and may absorb microwaves. The first shielding collar 16 may form a third impedance 40 and may absorb microwaves. The first, second and third impedances 36, 38, 40 are connected in parallel with the leaky microwave source 34 so that the oven door 10 can shield microwaves leaking from the cavity.

Referring to fig. 1 and 2, in some embodiments, the slots include a first slot 30 and a second slot 32, the first slot 30 being perpendicular to the second slot 32, and the first impedance 36 being a parallel impedance of the impedance formed by the first slot 30 and the impedance formed by the second slot 32.

In this way, the first impedance 36 may be made to eliminate microwaves over a wider range of frequency bands.

Referring to fig. 1, the installation groove 20 is formed as a rectangular parallelepiped type of installation groove 20 as a whole. The door body 14 may be formed as a rectangular door body 14, so that the door body 14 and the mounting groove 20 have regular shapes, and are convenient to assemble.

When the door 14 is mounted in the mounting groove 20, a first horizontal slit 30 is formed between the bottom surface of the door 14 and the bottom surface of the mounting groove 20, and a second annular slit 32 is formed between the circumferential side surface of the door 14 and the circumferential side surface of the mounting groove 20. The two slots may form a certain impedance to the microwaves to shield the microwaves.

Referring to fig. 1 and 4, an embodiment of the present invention also proposes an electromagnetic compatibility test apparatus 52.

In some embodiments of the present invention, the electromagnetic compatibility testing apparatus 52 includes:

The testing cavity 54 is used for placing the device to be tested, and the testing cavity 54 is provided with an opening; and

The oven door 10 of any of the above embodiments, the oven door 10 is rotatably connected to the test cavity 54 for opening and closing the opening.

Thus, the electromagnetic compatibility testing device 52 can avoid microwave leakage in different frequency bands through the oven door 10, so that the electromagnetic compatibility testing device can perform electromagnetic testing in different frequency bands on the device to be tested.

Wherein a test chamber is provided in the test chamber body 54, the test chamber having an opening through which a device to be tested can be placed into or removed from the test chamber when the oven door 10 is opened. The oven door 10 is rotatably connected to the test cavity 54, specifically, the door frame 12 is rotatably connected to the test cavity 54, and the door 14 is fixed to the door frame 12. When the oven door 10 is opened, the device to be tested can be put into or taken out of the test chamber; when the oven door 10 is in a closed state, the opening of the oven door 10 is closed, and the test cavity can be in a closed state, so that the electromagnetic compatibility test equipment 52 can perform electromagnetic test on the equipment to be tested.

The above explanation of the embodiment and advantageous effects of the oven door 10 is also applicable to the electromagnetic compatibility testing apparatus 52 of the present embodiment, and is not developed in detail here to avoid redundancy.

In some embodiments, the electromagnetic compatibility test apparatus 52 further includes:

the test cavity 54 is connected with an antenna 60, and the microwave transmitting assembly 56 and the microwave receiving assembly 58 are electrically connected with the antenna 60.

As such, the electromagnetic compatibility test device 52 may perform radiation disturbance (RE) testing, as well as radiation immunity (RS) testing, on the device under test.

Specifically, electromagnetic compatibility (EMC, electro Magnetic Compatibility) tests are classified into radiation disturbance (RE) tests and radiation immunity (RS) tests. Wherein, during RE testing, the electromagnetic compatibility testing device 52 is a receiving device; in the RS test, the electromagnetic compatibility test device 52 is a transmitting device. In the electromagnetic compatibility test device 52 of the above embodiment, the antenna 60 is used to receive or radiate microwaves, so as to perform an electromagnetic compatibility test on the device to be tested, where the electromagnetic compatibility test may include, but is not limited to, requirements of both RE and RS: on one hand, the electromagnetic interference generated by the equipment to be tested on the environment in the normal operation process cannot exceed a certain limit value, namely RE test; on the other hand, the device to be tested is required to have a certain degree of anti-interference capability on microwave interference existing in the environment, namely RS test. The microwave emitting assembly 56 may be used to generate microwaves and radiate the device under test to the outside through the antenna 60, thereby performing RS testing. The microwave receiving assembly 58 may be configured to receive and process microwaves, in particular, the antenna 60 may receive microwaves (electromagnetic waves) radiated to the outside by the device under test, and these microwaves may be transmitted into the microwave receiving assembly 58, and the microwave receiving assembly 58 may process the microwaves, thereby performing RE testing on the device under test.

In some embodiments, the electromagnetic compatibility testing apparatus 52 includes a switch 62, the switch 62 connecting the microwave emitting assembly 56 and the microwave receiving assembly 58, the switch 62 being configured to switch between electrically connecting the microwave emitting assembly 56 to the antenna 60 and electrically connecting the microwave receiving assembly 58 to the antenna 60.

In this way, the microwave transmitting component 56 and the microwave receiving component 58 can share the antenna 60, so that the antenna 60 does not need to be frequently replaced in the test process, thereby improving the efficiency of switching the functions of the antenna 60, and in addition, the antenna 60 does not need to be replaced to perform additional link calibration, so that the operation is simpler and more convenient, and the working efficiency of the electromagnetic compatibility test equipment 52 is improved.

Specifically, the switching element 62 is electrically connected to the antenna 60, and the antenna 60 may be selectively electrically connected to the microwave transmitting component 56 or the microwave receiving component 58 through the switching element 62, that is, the antenna 60 may be electrically connected to the microwave transmitting component 56 and turned on, and the antenna 60 is disconnected from the microwave receiving component 58; or the antenna 60 may be electrically connected to the microwave receiving assembly 58 to be turned on, in which case the antenna 60 is disconnected from the microwave emitting assembly 56 so that the antenna 60 has different functions, which may include receiving microwaves or radiating microwaves.

In the embodiment shown in fig. 4, the electromagnetic compatibility testing apparatus 52 further includes a processor 64, the processor 64 being electrically connected to the microwave emitting assembly 56, the microwave receiving assembly 58 and the switching member 62, the processor 64 being configured to control the operation of the microwave emitting assembly 56, the microwave receiving assembly 58 and the switching member 62.

In this embodiment, the microwave emitting assembly 56 includes a microwave signal generator 66 and two amplifiers 68. The microwave signal generator 66 is used for generating microwaves, and the two amplifiers 68 are used for performing secondary amplification, so that the microwaves generated by the microwave signal generator 66 can reach the standard of EMC test.

The microwave receiving assembly 58 includes an adjustable amplifier 70, a mixer 72, an analog-to-digital converter (ADC) 74 and a digital signal link unit 76, wherein an input terminal of the adjustable amplifier 70 is electrically connected to the switch 62, the mixer 72 is electrically connected to an output terminal of the adjustable amplifier 70 and an input terminal of the analog-to-digital converter 74, an output terminal of the analog-to-digital converter 74 is electrically connected to the digital signal link unit 76, and the digital signal link unit 76 is connected to the processor 64.

When the switching element 62 connects the microwave receiving assembly 58 to the antenna 60 and disconnects the microwave transmitting assembly 56 from the antenna, the adjustable amplifier 70 may amplify the microwave signal received by the antenna 60 to generate a radio frequency signal (RF), the radio frequency signal is input to the mixer 72, converted by the mixer 72 to generate an intermediate frequency signal (IF), and then converted to a digital signal by the processing of the analog-to-digital converter 74, and the digital signal link unit 76 processes the digital signal output by the analog-to-digital converter 74 to obtain a spectrum pattern corresponding to the digital signal. The processor 64 may process the data of the spectral patterns to control the display screen of the electromagnetic compatibility test apparatus to display the corresponding spectral patterns.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An oven door for an electromagnetic compatibility testing apparatus, the oven door comprising:

the door frame is provided with an installation groove, and the bottom surface of the installation groove is provided with a first shielding ring; and

The door body is installed the mounting groove, the door body is towards one side of mounting groove bottom surface is equipped with the second shielding circle, first shielding circle with the second shielding circle is the microwave shielding circle that has elasticity.

2. The oven door according to claim 1, characterized in, that the bottom surface of the mounting groove is provided with a first receiving groove, in which the first shielding ring is at least partially located.

3. The oven door according to claim 1, characterized in, that the side of the door body facing the bottom surface of the mounting groove is provided with a second receiving groove, in which the second shielding ring is at least partially located.

4. The oven door of claim 1 wherein the first shielding collar comprises one of the following:

A metal mesh;

filling a wave-absorbing material with a metal net;

A metal spring plate.

5. The oven door of claim 1 wherein the second shielding ring comprises one of the following:

A metal mesh;

filling a wave-absorbing material with a metal net;

A metal spring plate.

6. The oven door according to any one of claims 1 to 5, characterized in, that the equivalent circuit of the shielding door formed by the oven door is a parallel circuit of a leaky microwave source, a first impedance, a second impedance and a third impedance,

The first impedance is an impedance formed by a gap between the door body and the door frame;

the second impedance is the impedance formed by the second shielding ring;

the third impedance is an impedance formed by the first shielding ring.

7. The oven door of claim 6, wherein the slots comprise a first slot and a second slot, the first slot being perpendicular to the second slot, the first impedance being a parallel impedance of an impedance formed by the first slot and an impedance formed by the second slot.

8. An electromagnetic compatibility test apparatus, comprising:

the testing cavity is used for placing equipment to be tested and is provided with an opening;

The oven door of any one of claims 1-7, rotatably connected to the test cavity for opening and closing the opening.

9. The electromagnetic compatibility test apparatus of claim 8, wherein the electromagnetic compatibility test apparatus further comprises:

The testing cavity is connected with an antenna, and the microwave transmitting assembly and the microwave receiving assembly are electrically connected with the antenna.

10. The electromagnetic compatibility testing apparatus of claim 9, including a switch connecting said microwave transmitting assembly and said microwave receiving assembly, said switch for electrically connecting said microwave transmitting assembly to said antenna and for switching between said microwave receiving assembly and said antenna electrical connection.