Patent Description:
When a mobile terminal device operates, internal circuit boards, multimedia devices, and electronic elements such as connectors all generate related digital signal noise. Generally, a slit space exists between elements such as a circuit board, a battery, and a metal back frame of a display screen, and a middle frame of the mobile phone, and harmonics of the digital signal noise may be transmitted to an antenna at an edge of the middle frame by using the slit space as a transmission path, thereby causing poor operating performance of the antenna. When harmonics of digital signal noise of any frequency are greater than a cut-off frequency, lossless transmission can be implemented in the slit.

How to design to suppress lossless digital signal noise transmission inside a mobile phone is a research and development direction in the industry.

<CIT> relates to an electronic device, comprising a transceiver; and a display, comprising: a display substrate; a mid-support plate disposed adjacent to the display substrate, wherein the mid-support plate comprises one or more electromagnetic band gap structures formed through or disposed onto the mid-support plate; and a lower support plate disposed adjacent to the mid-support plate, wherein a space exists between the mid-support plate and the lower support plate.

<CIT> relates to an electronic device, comprising a rectangular housing having four edges; an internal metal housing support structure that extends between an opposing pair of the edges, wherein the internal metal housing support structure has at least one opening; and an antenna formed from at least part of the metal housing support structure, wherein the antenna produces image currents in the internal metal housing support structure that are influenced by the at least one opening.

<CIT> relates to an electronic device, comprising a housing including a first plate facing a first direction, a second plate facing a second direction opposite to the first direction, and a side plate facing a third direction perpendicular to the first direction and surrounding part of a space between the first plate and the second plate; a display positioned inside the housing and exposed through the first plate; a first conductive plate attached to or integrated into the display, wherein the first conductive plate faces the first direction, and wherein the first conductive plate includes a first periphery extending along the side plate; a second conductive plate facing the third direction, wherein the second conducive plate includes a second periphery extending along the first periphery and wherein a portion of the second periphery is coupled to the first periphery; and a wireless communication circuit electrically connected to the second conductive plate, wherein the wireless communication circuit is configured to use at least one of the first conductive plate and the second conductive plate as an antenna element.

This application provides a terminal device with a noise suppression structure, to suppress digital signal noise transmission within a slit by changing a transmission characteristic of the slit, so as to resolve a technical problem of lossless digital signal noise transmission inside a mobile phone.

An embodiment provides a terminal device with a noise suppression structure, including an antenna, a middle frame, and a first component, where the middle frame includes a metal middle plate and a metal bezel, the antenna is disposed on the metal bezel, the metal middle plate includes a first surface and a second surface opposite to the first surface, the first component is mounted on the middle frame, and a first cavity is formed between the first component and the first surface. The terminal includes a noise suppression structure, the noise suppression structure is disposed on the metal middle plate, the noise suppression structure includes a hollow region running through the first surface and the second surface, and the hollow region communicates with the first cavity; and digital signal noise that uses the first cavity as a transmission medium has a propagation path in a direction toward the antenna, the propagation path passes through the hollow region, and the hollow region is used to suppress the digital signal noise transmitted by using the propagation path. In the terminal described in this embodiment, a hollow region is disposed on a metal middle plate of a middle frame, so as to change a transmission characteristic of a cavity that is formed in the metal middle plate, and the hollow region is located on a transmission path connected to an antenna of the terminal, so that electric field distribution and magnetic field distribution of digital signal noise are changed when the digital signal noise is transmitted on the transmission path in the cavity. The hollow region can suppress a part of the digital signal noise, so that digital signal noise transmission at a specific frequency on the transmission path is suppressed, where the specific frequency is an operating frequency of the antenna.

The noise suppression structure includes a plurality of slits running through the middle plate, each of the slits extends in a curved way, and the plurality of slits are regularly arranged to form the hollow region. The plurality of slits have consistent extension directions and are spaced, or the plurality of slits have consistent extension directions and are arranged side by side, and every two adjacent slits communicate with each other head to tail. By setting a hollow region of a complex structure, not only cavity transmission suppression for digital signal noise at a fixed frequency can be implemented, but also cavity transmission suppression for ultra-wideband digital signal noise can be implemented. The foregoing two embodiments may provide design and suppression for frequencies of noise from different signal noise sources, thereby simplifying a processing process of the terminal device.

In an embodiment, an area of the hollow region has a corresponding change trend relationship with a frequency and a bandwidth of the digital signal noise passing through the hollow region. Different types of hollow regions are provided according to frequency and bandwidth characteristics of the digital signal noise. An increase in the area and density of the hollow region may suppress digital signal noise with a larger resonance frequency, and further may specially suppress digital signal noise with different resonance frequencies.

In an example not being covered by the claimed invention, the hollow region includes a through-slot running through the first surface and the second surface, the through-slot includes a strip-shaped first segment and two strip-shaped second segments, the first segment extends along a width direction of the metal middle plate, and the two second segments are respectively bent and extend from two opposite ends of the first segment toward a length direction of the metal middle plate.

In an example not being covered by the claimed invention, there are two through-slots, first segments of the two through-slots are spaced in parallel, and extension directions of second segments of the two through-slots are opposite.

In an example not being covered by the claimed invention, the hollow region includes two through-slot groups, each of the through-slot groups includes a first through-slot and a second through-slot, and the first through-slot and the second through-slot are spaced; and the first through-slot includes a strip-shaped first segment and two strip-shaped second segments, the first segment extends along a width direction of the metal middle plate, and the two second segments are respectively bent and extend from two opposite ends of the first segment toward a length direction of the metal middle plate. The second through-slot has a same structure as but a different size from the first through-slot, the second through-slot includes a first segment and two second segments, the second through-slot is located between the two second segments of the first through-slot and has a same symmetry axis as the first through-slot, and the second segment of the first through-slot has a same extension direction as the second segment of the second through-slot; and in the two through-slot groups, a first through-slot of one through-slot group is spaced from a first through-slot of the other through-slot group, and an extension direction of a second segment of one first through-slot is opposite to that of a second segment of the other first through-slot.

In an example not being covered by the claimed invention, the noise suppression structure includes a plurality of holes running through the middle plate, and the plurality of holes are spaced regularly to form the hollow region.

In an example not being covered by the claimed invention, an axial cross-sectional contour of each of the holes is a regular polygon or a circular shape. By setting holes of different shapes to form a hollow region, a structure is simple and easy to implement, and is more suitable for suppressing digital signal noise with a small resonance frequency range of a corresponding noise frequency. In an embodiment, the hollow region is a strip-shaped through-slot running through the metal middle plate. The hollow region in this structure has a simple structure and is easy to process, and is suitable for suppressing low-frequency signal noise.

In an embodiment, the terminal device with a noise suppression structure includes a second component mounted on the middle frame, the second component is opposite to the first or second surface and forms a second cavity with the first or second surface, the second cavity is spaced from the first cavity, and the hollow region communicates with the second cavity. The hollow region of the noise suppression structure can also suppress digital signal noise in another cavity on the other side of the middle frame. An additional noise suppression structure is not required, and a terminal structure is simplified and processing difficulty is reduced.

In an embodiment, the terminal device includes a third component mounted on the middle frame, the third component is opposite to the first or second surface and forms a third cavity with the first or second surface, the third cavity is spaced from the first cavity and the second cavity, and the hollow region of the noise suppression structure communicates with the third cavity. The hollow region of the noise suppression structure can also suppress digital signal noise in another cavity on the other side of the middle frame. An additional noise suppression structure is required, and a terminal device structure is simplified and processing difficulty is reduced.

In an embodiment, the terminal device includes a second component and a third component mounted on the middle frame, the second component and the third component are both opposite to the second surface, the second component and the third component form a second cavity and a third cavity with the second surface respectively, the second cavity and the third cavity are spaced side by side, and a first noise suppression structure and a second noise suppression structure that have a same structure as the noise suppression structure are disposed at locations on the metal middle plate and opposite to the second cavity and the third cavity respectively, and the noise suppression structure is located between the first noise suppression structure and the second noise suppression structure. In an embodiment, the first component is a display screen, the third component is a battery, and the second component is a circuit board; or the third component is a circuit board, and the second component is a circuit board. In this embodiment, the first component is a display screen, the third component is a battery, and the second component is a circuit board. The antenna of the terminal is located at the top or a side part. For example, when the antenna of the terminal is located at the top, a signal is transmitted from the bottom of the terminal when the display screen operates. Signal noise is propagated in a plurality of paths in the first cavity, and a noise suppression structure is disposed on a propagation path toward the antenna. A hollow region of the noise suppression structure suppresses digital signal noise generated during operation of the display screen, and is specially for noise that affects an operating frequency corresponding to the antenna. In this way, impact of a noise signal on operating performance of the antenna in the frequency band can be reduced or prevented.

In an embodiment, the first component is a display screen, the display screen includes a metal backplane opposite to the first surface, and the metal backplane is further provided with the noise suppression structure. In this embodiment, on the basis of the foregoing embodiment, a noise suppression structure is also disposed on the back of the display screen, so that digital signal noise in a larger frequency band can be suppressed.

In an embodiment, the noise suppression structure is located on the metal middle plate at a location corresponding to a middle region of the transmission path. In this embodiment, an existing common antenna is disposed at the top of the terminal, a signal source is located at the bottom, and digital signal noise in the middle region has greatest impact on corresponding operating performance of the antenna. Therefore, a noise suppression structure may be disposed in the middle region to suppress the digital signal noise, so as to ensure antenna performance.

In an embodiment, the first component is a display screen, the display screen includes a metal backplane opposite to the first surface, and the metal backplane is further provided with the noise suppression structure; and the hollow region includes a through-slot running through the first surface and the second surface, the through-slot includes a strip-shaped first segment and two strip-shaped second segments, the first segment extends along a width direction of the metal middle plate, and the two second segments are respectively bent and extend from two opposite ends of the first segment toward a length direction of the metal middle plate.

In an embodiment, the first component is a display screen, the display screen includes a metal backplane opposite to the first surface, and the metal backplane is further provided with the noise suppression structure; and the hollow region of the noise suppression structure on the metal backplane is formed by several slits, the slits extend in a serpentine shape, every two adjacent slits are symmetrically disposed, and a total length direction of the slits is consistent with a width direction of the metal middle plate. In this embodiment, a resonance frequency of the noise suppression structure in the first cavity presents an ultra-wideband characteristic. By providing the metal backplane of the first cavity with a slit structure having a complex form and a large density, not only cavity transmission suppression for fixed-frequency noise can be implemented, but also cavity transmission suppression for ultra-wideband noise can be implemented.

The hollow region of the noise suppression structure on the metal backplane is formed by a plurality of holes that have a cross-sectional area of "cross", and the plurality of holes are arranged in a matrix at a middle location of the metal middle plate. In this embodiment, a feature mode transmission characteristic of an original cavity is changed by using a noise suppression structure formed by holes in a "cross" shape. The noise suppression structure formed by the holes in a "cross" shape may generate, in the cavity, a resonance point of a fixed frequency corresponding to a digital signal noise frequency that affects operation of an existing display screen, and may improve suppression on noise transmission at this frequency. In addition, by adjusting an individual quantity of "cross" shaped array aperture structures and an array arrangement manner, a resonance frequency of a corresponding noise frequency can be generated in the cavity, and transmission of specific-frequency noise can be suppressed.

In an embodiment, the terminal includes a top end and a bottom end, the antenna is at a top end location, the noise suppression structure is at a middle location of the metal backplane, and an overall length of the hollow structure extends along a length direction of the metal backplane. A hollow structure is disposed at a middle location for digital signal noise frequency affecting operation of an existing display screen, so that noise transmission can be more effectively suppressed.

A terminal device with a noise suppression structure includes an antenna, a middle frame, and a display screen, where the display screen includes a metal backplane, the antenna is disposed at an edge of the middle frame, the middle frame includes a first surface and a second surface opposite to the first surface, the display screen is mounted on the middle frame, and a cavity is formed between the metal backplane and the first surface. The terminal includes a noise suppression structure, the noise suppression structure is disposed on the metal backplane, the noise suppression structure includes a hollow region running through the metal backplane, and the hollow region communicates with the cavity, so that digital signal noise that uses the cavity as a transmission medium has a propagation path in a direction toward the antenna, the propagation path passes through the hollow region, and the hollow region is used to suppress the digital signal noise transmitted by using the propagation path. In the terminal device in this embodiment, a noise suppression structure is disposed on a metal backplane of a display screen, so as to change a transmission characteristic of a cavity that is formed in the metal backplane, and the hollow region is located on a transmission path connected to an antenna of the terminal, so that electric field distribution and magnetic field distribution of digital signal noise are changed when the digital signal noise is transmitted on the transmission path in the cavity. The hollow region can suppress a part of the digital signal noise, so that digital signal noise transmission at a specific frequency on the transmission path is suppressed, where the specific frequency is an operating frequency of the antenna.

In an embodiment, the hollow region includes a through-slot running through the first surface and the second surface, the through-slot includes a strip-shaped first segment and two strip-shaped second segments, the first segment extends along a width direction of the metal middle plate, and the two second segments are respectively bent and extend from two opposite ends of the first segment toward a length direction of the metal middle plate.

In an embodiment, there are two through-slots, first segments of the two through-slots are spaced in parallel, and extension directions of second segments of the two through-slots are opposite.

In an embodiment, the hollow region includes two through-slot groups, each of the through-slot groups includes a first through-slot and a second through-slot, and the first through-slot and the second through-slot are spaced; the first through-slot includes a strip-shaped first segment and two strip-shaped second segments, the first segment extends along a width direction of the metal middle plate, and the two second segments are respectively bent and extend from two opposite ends of the first segment toward a length direction of the metal middle plate; the second through-slot has a same structure as but a different size from the first through-slot, the second through-slot includes a first segment and two second segments, the second through-slot is located between the two second segments of the first through-slot and has a same symmetry axis as the first through-slot, and the second segment of the first through-slot has a same extension direction as the second segment of the second through-slot; and in the two through-slot groups, a first through-slot of one through-slot group is spaced from a first through-slot of the other through-slot group, and an extension direction of a second segment of one first through-slot is opposite to that of a second segment of the other first through-slot.

According to the terminal device with a noise suppression structure described in this application, a noise suppression structure is disposed on a middle frame, which is corresponding to a cavity formed by the middle frame and a first component, so as to suppress digital signal noise generated when the terminal operates, so as to reduce impact of digital signal noise on antenna operating performance, so as to resolve a technical problem of lossless digital signal noise transmission inside a mobile phone. Compared with a conventional solution that a spring plate, a conductive foam, or a wave absorbing material needs to be added for suppressing noise transmission within a cavity, in the technical solution of this application, costs of an electrical connection auxiliary material can be reduced, the technical solution is not limited by a spatial structure of the cavity, and implementation is flexible.

To describe the technical solutions in the embodiments of this application or the background more clearly, the following describes the accompanying drawings required in the embodiments of this application or the background.

Referring to <FIG>, this application provides a terminal device with a noise suppression structure. The terminal device may be a mobile electronic device with an antenna such as a mobile phone or a tablet computer. For example, the terminal in this embodiment is a mobile phone <NUM>, and the mobile phone <NUM> includes an antenna (not shown in the figure), a middle frame <NUM>, a first component <NUM>, a second component <NUM>, and a third component <NUM>. The middle frame <NUM> includes a metal middle plate <NUM> and a metal bezel <NUM>, and the antenna (not shown) is disposed on the metal bezel <NUM> and is located at the top of the mobile phone <NUM>. The metal middle plate <NUM> includes a first surface <NUM> and a second surface <NUM> opposite to the first surface <NUM>. The first component <NUM> is mounted on the middle frame <NUM>, and a first cavity <NUM> is formed between the first component <NUM> and the first surface <NUM>, as shown in <FIG>. In this embodiment, the second component <NUM> and the third component <NUM> are mounted on a same side of the middle frame <NUM> and are spaced opposite to the second surface <NUM>. The first component <NUM> is a display screen, the third component <NUM> is a battery, and the second component <NUM> is a circuit board; or the third component <NUM> is a circuit board, and the second component <NUM> is a circuit board. In another implementation, the second component <NUM> or the third component <NUM> may be spaced from and be disposed on a same side as the first component. The first component <NUM> may be one of electronic devices in the mobile phone such as a display screen, a circuit board, and a battery. The second component <NUM> and the third component <NUM> are one of electronic devices such as a display screen, a circuit board, a battery, and a multimedia device in the mobile phone that may form a cavity with the metal middle plate <NUM> of the middle frame <NUM>, and have a different function from the first component.

Referring to <FIG>, the mobile phone <NUM> includes a noise suppression structure B. The noise suppression structure B in this embodiment is disposed on the metal middle plate <NUM>, the noise suppression structure B includes a hollow region running through the first surface <NUM> and the second surface <NUM>, and the hollow region communicates with the first cavity <NUM>. Digital signal noise that uses the first cavity <NUM> as a transmission medium has a propagation path in a direction toward the antenna, the propagation path passes through the hollow region, and the hollow region is used to suppress the digital signal noise transmitted by using the propagation path. It may be understood that the noise suppression structure B is an open-hole slit structure, the propagation path is a noise transmission path that affects operation of an antenna, and the propagation path intersects the hollow region, so as to prevent digital signal noise that affects the antenna from reaching the antenna through the path. Suppression of digital signal noise refers to suppression of noise propagation and changing a noise transmission path, or may be absorption of the noise. Further, an area of the hollow region has a corresponding change trend relationship with a frequency and a bandwidth of the digital signal noise passing through the hollow region. It may also be understood that different forms of hollow regions are set to suppress the digital signal noise according to frequency and bandwidth characteristics of the digital signal noise. The corresponding change trend relationship is a corresponding change in an area of the hollow region according to a change of a frequency and bandwidth of the digital signal noise, so as to implement targeted suppression. For example, for a point frequency whose digital signal noise frequency is about <NUM>, the hollow region may use a U-shaped aperture structure. If the noise frequency is about <NUM>, a corresponding change trend is that when the U-shaped aperture structure is larger, and a suppression frequency of the U-shaped aperture structure changes. That is, it is understood that digital signal noise of different frequencies may be specially suppressed by designing an area of a hollow region. Specifically, the shape and array arrangement (density) of the hollow region are used to change the area of the hollow region. The hollow region may be designed in a plurality of forms according to a frequency and bandwidth of the digital signal noise that passes through the hollow region, so as to obviously suppress point-frequency noise of a narrow band and broadband noise. For example, a digital signal noise frequency is a point frequency of <NUM>, and the hollow region is a groove structure or a hole structure. If noise increases to <NUM>, the groove structure (hole structure) (may be understood as a slit) needs to be larger, or one groove structure needs to be added, and a suppression frequency of the hole structure changes. That is, it is understood that digital signal noise of different resonance frequencies may be specially suppressed by designing the area of the hollow region.

Specifically, the shape and array arrangement (density) of the hollow region are used to change the area of the hollow region. The hollow region may be designed in a plurality of forms according to a frequency and bandwidth of the digital signal noise that passes through the hollow region, so as to obviously suppress narrowband point-frequency noise and broadband noise. In this embodiment, the hollow region of the noise suppression structure B may be formed in an etching manner, or may be directly stamped and cut in a manufacturing process of the metal middle plate. The location of the noise suppression structure B on the metal middle plate <NUM> is set according to a transmission path from a digital signal noise transmit point to an antenna location; and is reserved for only digital signal noise that uses the first cavity <NUM> as a transmission path, or may be reserved for digital signal noise in a cavity generated between another electronic device and the metal middle plate. In this embodiment, a specific location of the noise suppression structure B on the metal middle plate <NUM> is set for digital signal noise that affects antenna operation and that is transmitted in the first cavity <NUM>. The noise suppression structure B changes a transmission characteristic of the first cavity <NUM>, so that electric field distribution and magnetic field distribution of the digital signal noise are changed when the digital signal noise is transmitted in the cavity, thereby implementing suppression of digital signal noise transmission at a specific frequency. The digital signal noise includes narrowband point-frequency noise and broadband noise. The specific frequency refers to a frequency that affects an operating frequency of the antenna, and may be a frequency of a resonance point, or may be a resonance frequency in a specific range. For example, when the display screen of the mobile phone operates, a common noise signal is generated in the first cavity <NUM> when the display screen operates. A frequency band transmitted toward the antenna in the noise signal affects an operating frequency band of the antenna in this case, and the noise suppression structure B suppresses transmission of the digital signal noise for impact on the operating frequency band of the display screen. It should be noted that the noise suppression structure is not limited to a middle location of the cavity. In this embodiment, noise is transmitted from the bottom of the mobile phone, and the antenna is disposed at the top of the mobile phone, just through the middle of the first cavity. Actually, the antenna may be located on the left or right or corner. For example, noise is in an upper right corner of the cavity, and the antenna is in an upper left corner of the cavity. The noise suppression structure is disposed in an upper half of the cavity, and extends along a length direction of the mobile phone, so as to ensure that the noise suppression structure is located on a propagation path to the antenna.

In this embodiment, as shown in <FIG>, the metal middle plate <NUM> is a rectangular plate body, the metal bezel <NUM> is disposed around a peripheral side of the metal middle plate <NUM>, the metal bezel <NUM> and the first surface <NUM> of the metal middle plate <NUM> form a first mounting location (not marked in the figure), and the metal bezel <NUM> and the second surface <NUM> form a second mounting location (not marked in the figure). Specifically, the first mounting location and the second mounting location are groove structures. The first mounting location and the second mounting location are used to mount electronic devices such as the battery and the display screen. The antenna is disposed on the metal bezel <NUM> and is located at the top of the mobile phone <NUM>, and a processor of the mobile phone is located at the bottom of the mobile phone. The first component <NUM> of this embodiment is a display screen. The first component <NUM> is mounted at the first mounting location of the metal middle frame <NUM> and has a gap with the first surface <NUM>, that is, the first cavity <NUM>. The second component <NUM> and the third component <NUM> are spaced at the second mounting location, the second component <NUM> may be a battery or a circuit board, and the third component <NUM> may be a circuit board or a battery. Actually, the first cavity <NUM> is a slit in a tolerance existing in an assembly process, or a surface of the first component <NUM> and the first surface <NUM> are not smooth enough to generate a slit that can be used as a transmission medium in a range. In another implementation, the antenna may also be disposed on a side of the mobile phone, and has a distance from the processor or another noise transmit source, and constitutes a transmission distance of the digital signal noise.

Referring to <FIG> at the same time, <FIG> is a schematic structural diagram of the metal middle plate. In an example not being covered by the claimed invention, the hollow region includes a through-slot <NUM> running through the first surface <NUM> and the second surface <NUM>, the through-slot <NUM> includes a strip-shaped first segment <NUM> and two strip-shaped second segments <NUM>, the first segment <NUM> extends along a width direction (a direction X in the figure) of the metal middle plate <NUM>, and the two second segments <NUM> are bent and extend from opposite ends of the first segment <NUM> to a length direction (a direction Y in the figure) of the metal middle plate <NUM>. The through-slot is approximately a "U"-shaped groove, and is disposed at a substantially middle location of the metal middle plate <NUM>. Specifically, the first segment <NUM> is located on the transmission path at the middle location of the metal middle plate <NUM>. In this example, the noise suppression structure is formed by using a U-shaped groove, so that noise at around a <NUM> frequency can be suppressed. When a width of the through-slot <NUM> increases and a quantity thereof increases, an area of the hollow region is increased, and digital signal noise at a higher frequency can be suppressed. In an implementation, the quantity of through-slots may be increased. For example, two through-slots are spaced in a length direction of the metal middle plate <NUM>, and the second segment <NUM> extends in a direction toward the top of the mobile phone, thereby suppressing transmission of noise in a large frequency range in the cavity.

In this example, the noise suppression structure B is disposed on the metal middle plate <NUM>, and the hollow region is formed in a form of a "U"-shaped through-slot, so that electric field distribution and magnetic field distribution of digital signal noise that are transmitted in the cavity change, thereby suppressing digital signal noise that is propagated in a direction toward the antenna A at the top of the mobile phone through the bottom of the mobile phone <NUM> and that is generated when the first component <NUM> operates, thereby implementing suppression of digital signal noise transmission at a specific frequency. In addition, it is ensured that the transmission path of the digital signal noise completely passes through the hollow region, so as to prevent some digital signal noise from bypassing, which affects a suppression effect. Certainly, signal noise that affects the antenna, that passes through the hollow region, and that is generated by another electronic device may also be suppressed. In this application, a hollow region is formed in a form of a through-slot to suppress specific digital signal noise that passes through the region, thereby reducing impact on antenna operation. The noise suppression structure B is disposed on the metal middle plate, and does not occupy space and a structure is simple and easy to implement. Referring to <FIG>, in an example not being covered by the claimed invention, there are two through-slots <NUM> in the foregoing embodiment, first segments <NUM> of the two through-slots <NUM> are spaced in parallel, and extension directions of second segments <NUM> of the two through-slots <NUM> are opposite. In this example, a noise suppression structure formed by the two through-slots <NUM> may generate two fixed-frequency resonance points in the first cavity <NUM>, and may suppress broadband noise transmission in a specific frequency range in the cavity.

Referring to <FIG>, in an example not being covered by the claimed invention, the hollow region includes two through-slot groups, one through-slot group Q1 and the other through-slot group Q2 both include a first through-slot 21A and a second through-slot 21B, and the first through-slot 21A and the second through-slot 21B are spaced. In another implementation, a quantity of through-slots in each group may be increased, so that transmission of broadband noise in a specific frequency range can be suppressed.

In this example, shapes and structures of the first through-slot and the second through-slot are the same as those of the through-slots in the foregoing example. The first through-slot 21A includes a strip-shaped first segment 211A and two strip-shaped second segments 212A, the first segment 211A extends in a width direction (in a direction X in the figure) of the metal middle plate <NUM>, and the two second segments 212A are bent and extend from opposite ends of the first segment 211A to a length direction (in a direction Y in the figure) of the metal middle plate <NUM>.

The second through-slot 21B has a same structure as but a different size from the first through-slot 21A, the second through-slot 21B includes a first segment 211B and two second segments 212B, the second through-slot 21B is located between the two second segments 212A of the first through-slot 21A and has a same symmetry axis as the first through-slot 21A, and the second segment 212A of the first through-slot 21A has a same extension direction as the second segment 212B of the second through-slot 21B.

In the two through-slot groups, a first through-slot 21A of one through-slot group Q1 is spaced from a first through-slot 21A of the other through-slot group Q2, a second segment of the first through-slot of one through-slot group Q1 extends in a direction toward the bottom of the mobile phone, and a second segment of the first through-slot of the other through-slot group Q2 extends in a direction toward the top of the mobile phone. In this example, a quantity of through-slots in the through-slot group may be increased to form a larger array. By increasing the quantity of through-slots in the "U-shaped array", suppression of broadband noise can be enhanced. Suppression may be further implemented for a larger resonance frequency by changing the overall (first and second segments) width of the through-slots within the through-slot group. Referring to <FIG>, and <FIG>, <FIG> is a simulation diagram of electric field distribution in a first cavity in which a noise suppression structure is not disposed in a mobile phone. From a simulation result, it is considered that noise transmission from a bottom end <NUM> to a top end <NUM> is in a fully-connected state, and the noise may be transmitted without loss in the cavity. <FIG> is a simulation diagram of electric field distribution of a cavity in which a noise suppression structure in this example is disposed on a metal middle plate. <FIG> is a simulation diagram of current distribution in a cavity when a noise suppression structure in this example is disposed on a metal middle plate. The noise suppression structure changes surface current and electric field distribution inside the cavity. Noise transmission from the bottom end to the top end (from the bottom end to the top end of the metal middle plate in the figure) generates obvious suppression.

In an example, the noise suppression structure B includes a plurality of holes running through the metal middle plate <NUM>, and the plurality of holes are spaced regularly to form the hollow region. An axial cross-sectional contour of each of the holes is a regular polygon or a circular shape. The axial cross-sectional contour of the hole is a regular polygon such as a cross shape, a double cross shape, a rectangle, and a prism. A regular arrangement generally refers to a matrix arrangement or a circular or another regular arrangement, provided that digital noise that affects operating performance of the antenna can be suppressed.

Referring to <FIG>, in this example not being covered by the claimed invention, the noise suppression structure B includes several holes whose axial cross-sectional contour is a "cross" shape, and the holes are arranged in a matrix, and are specifically arranged in two columns and extend along a width direction of the metal middle plate <NUM>. A length of the array formed by the holes is the same as or close to a length of the metal middle plate <NUM>, and location of the holes are disposed on the premise that a peripheral edge of the metal middle plate <NUM> is normally connected to the metal middle frame <NUM>, so as to maximize suppression of digital signal noise. The holes are spaced in two columns according to a specific example, each column has nine holes, and a spacing a between the two columns of holes is <NUM>. The noise suppression structure B in this example can suppress digital signal noise near a <NUM> frequency that propagates in a direction toward the antenna at the top of the mobile phone through the bottom of the mobile phone. A propagation path of the digital signal passes through and completely passes through the hollow region, that is, no part of the propagation path avoids the hollow region, so as to ensure that the digital signal noise is effectively suppressed. A noise suppression structure of a cross-shaped hole structure can suppress larger broadband noise transmission. In the foregoing example, in a hollow region formed by several holes, when an area of a cross-section of the hole is increased, that is, a larger density is provided for the holes, thereby improving a suppression effect of the noise suppression structure B. It should be noted that this example merely enumerates a hollow structure in which only one frequency is suppressed. For noise at another frequency, for example, noise at a higher frequency such as <NUM>, <NUM>, and <NUM>, noise may be correspondingly suppressed by adjusting an area and a shape of the hollow region in any one of the foregoing embodiments.

In an example not being covered by the claimed invention, the noise suppression structure B is a strip-shaped through-slot (not shown) running through the metal middle plate <NUM>. The hollow region is the through-slot, and there are one or more through-slots. A structure of the noise suppression structure B in this example is simple, and is applicable to suppressing digital signal noise corresponding to a resonance point. Certainly, an area and a quantity of the through-slots are increased to increase a range of suppressing digital signal noise.

Referring to <FIG>, in an embodiment according to the invention, the noise suppression structure B includes a plurality of slits running through the metal middle plate <NUM>, each of the slits extends in a curved way, and the plurality of slits are regularly arranged to form the hollow region. A hollow region is formed by using a plurality of slits extending in a curved way, so that a structure of the hollow region is complicated, and a suppression range of the noise suppression structure B to digital signal noise is increased within a specific unit area. The slits may cross-extend or may extend in parallel in a same direction. According to the invention, the plurality of slits have same extension directions (the same extension direction or the same trend) and are spaced, or the plurality of slits have consistent extension directions and are arranged side by side, and two adjacent slits communicate with each other head to tail. In this embodiment, the slits extend in a serpentine shape, every adjacent slit communicate with each other head to tail, and two slits may be considered as one group. A plurality of groups of slits C1 are disposed on the metal middle plate <NUM>. Each group includes two slits, and an entity curved frame C2 is formed between two adjacent slits, and is used to separate two slits C1. The two slits C1 share one frame and have a communication region. This structure does not need to cut more parts on the metal middle plate <NUM>, so that strength of the middle plate is ensured. In the noise suppression structure B in this embodiment, by setting a hollow region of a complex structure, not only cavity transmission suppression for digital signal noise at a fixed frequency can be implemented, but also cavity transmission suppression for ultra-wideband digital signal noise can be implemented.

According to the terminal device with a noise suppression structure described in this embodiment, a hollow region is disposed on the metal middle plate <NUM> of the middle frame <NUM>, so as to change a transmission characteristic of a cavity that is formed by the metal middle plate <NUM> and another electronic device, and the hollow region is located on a transmission path connected to an antenna of the terminal, so that electric field distribution and magnetic field distribution of digital signal noise that are generated by an electronic device such as a display screen are changed when the digital signal noise is transmitted on the transmission path in the cavity. The hollow region may suppress a part of the digital signal noise, so that digital signal noise transmission at a specific frequency on the transmission path is suppressed, thereby avoiding impact on antenna performance. Referring to <FIG>, in another embodiment, on the basis of the foregoing embodiment, a second cavity <NUM> is formed between the second component <NUM> and the second surface <NUM>. The second component <NUM> is a circuit board, and digital signal noise is generated when the second component <NUM> operates, and is transmitted by using the second cavity. The second cavity <NUM> is spaced from the first cavity <NUM>, and the hollow region of the noise suppression structure B communicates with the second cavity <NUM>. Similarly, the noise suppression structure B may suppress digital signal noise on the other side of the middle frame <NUM> and that uses the second cavity <NUM> as a transmission path. An additional noise suppression structure is not required, and a terminal structure is simplified and processing difficulty is reduced. Specifically, the second component <NUM> is located at a second mounting location, the second cavity <NUM> and the first component <NUM> are located on opposite sides of the metal middle plate <NUM>, and the second cavity <NUM> and the first cavity <NUM> are spaced by using the metal middle plate <NUM>. The hollow region communicates with both the first cavity <NUM> and the second cavity <NUM>, and digital signal noise transmitted by using the first cavity <NUM> and the second cavity <NUM> can be suppressed. In another implementation, the second component <NUM> is located at the first mounting location, forms a second cavity with the first surface <NUM>, and is disposed side by side with the first component <NUM>, and the first cavity <NUM> and the second cavity are spaced.

In still another embodiment, a third cavity <NUM> is formed between the third component <NUM> and the second surface <NUM>. The third component <NUM> is a battery. The third cavity <NUM> is spaced from the first cavity <NUM> and the second cavity <NUM>, and the hollow region of the noise suppression structure B communicates with the third cavity <NUM>. When the third component <NUM> operates, digital signal noise is generated and transmitted by using the third cavity, and the hollow region of the noise suppression structure B can also suppress the digital signal noise in the third cavity <NUM>. An additional noise suppression structure B is not required, and a terminal structure is simplified and processing difficulty is reduced. The third cavity <NUM> and the first cavity <NUM> or the second cavity may be on a same side of the metal middle plate <NUM>, or may be on opposite sides of the metal middle plate <NUM>. It should be noted that, in the foregoing two embodiments, an auxiliary noise suppression structure similar to that of the noise suppression structure B may be additionally disposed at locations corresponding to the second cavity and the third cavity in the metal middle plate <NUM>, so as to respectively suppress digital signal noise in different frequency bands transmitted by the corresponding second cavity <NUM> and third cavity <NUM>, and more specially implement noise suppression.

As shown in <FIG>, in an embodiment, based on an embodiment in which the mobile phone <NUM> includes the second component <NUM> and the third component <NUM> that are mounted on the middle frame <NUM>, the second cavity <NUM> and the third cavity <NUM> are spaced side by side, and a first noise suppression structure B1 and a second noise suppression structure B2 that have a same structure as the noise suppression structure B are disposed at locations on the metal middle plate <NUM> and opposite to the second cavity <NUM> and the third cavity <NUM> respectively, and the noise suppression structure B is located between the first noise suppression structure B1 and the second noise suppression structure B2. In this embodiment, the second component <NUM> and the third component <NUM> are mounted at the second mounting location B, and the second mounting location is two independent mounting slots. The first component <NUM> is a display screen, the third component <NUM> is a battery, and the second component <NUM> is a circuit board. For example, when the antenna of the terminal is located on a top display screen, a signal is transmitted from the bottom of the terminal. Digital signal noise generated when the battery, the circuit board, and the display screen are operating is propagated in plurality of paths in the first cavity <NUM>, the second cavity <NUM>, and the third cavity <NUM>. The noise suppression structure B, the first noise suppression structure B <NUM>, and the second noise suppression structure B2 are respectively disposed on a propagation path toward the antenna for the first cavity <NUM>, the second cavity <NUM>, and the third cavity <NUM>, and noise suppression structures may be specially disposed for digital signal noise generated by the electronic device. In this way, digital signal noise generated when the battery, the circuit board, and the display screen are operating is suppressed, and noise affecting a corresponding operating frequency of the antenna is particularly targeted. In this way, impact of digital signal noise on operating performance of the antenna in the frequency band can be reduced or prevented.

In an embodiment, as shown in <FIG>, the first component <NUM> is a display screen, the display screen includes a metal backplane <NUM> opposite to the first surface <NUM>, and the metal backplane <NUM> is further provided with the noise suppression structure (not shown). The noise suppression structure may be the noise suppression structure B described in any one of the foregoing embodiments. In this embodiment, on the basis of the foregoing embodiment, a noise suppression structure is also disposed on the back of the display screen, so that noise generated on the display screen can be suppressed, thereby improving a suppression effect.

Referring to <FIG>, in another embodiment of the terminal device with a noise suppression structure in this application, different from the foregoing embodiment, the noise suppression structure B is disposed only on the display screen. Specifically, the display screen <NUM> includes a metal backplane <NUM>, the antenna A is disposed on a top edge of the middle frame <NUM>, the middle frame <NUM> includes a first surface <NUM> and a second surface <NUM> opposite to the first surface <NUM>, the display screen is mounted on the middle frame <NUM>, and a cavity (a first cavity) is formed between the metal backplane <NUM> and the first surface <NUM>. The noise suppression structure B is disposed on the metal backplane <NUM>, the noise suppression structure B includes a hollow region running through the metal backplane <NUM>, and the hollow region communicates with the cavity. Digital signal noise generated by the display screen is propagated in a direction toward the antenna by using the first cavity <NUM> as a transmission medium, and passes through the hollow region, where the hollow region is used to suppress digital signal noise transmitted by using the propagation path. In the terminal in this embodiment, a noise suppression structure B is disposed on a metal backplane <NUM> of a display screen <NUM>, so as to change a transmission characteristic of a cavity that is formed in the metal backplane <NUM>, and the hollow region is located on a transmission path connected to an antenna of the terminal, so that electric field distribution and magnetic field distribution of digital signal noise are changed when the digital signal noise is transmitted on the transmission path in the cavity. The hollow region can suppress a part of the digital signal noise, so that digital signal noise transmission at a specific frequency on the transmission path is suppressed. In this embodiment, the noise suppression structure B is directly disposed on the back of the display screen <NUM>, so as to suppress digital signal noise generated by the display screen, and a better suppression effect can be achieved.

In conclusion, in the terminal described in this application, a noise suppression structure B is disposed on a middle frame <NUM>, which is corresponding to a cavity formed by the middle frame <NUM> and an electronic device such as a first component <NUM>, so as to suppress digital signal noise generated when the terminal operates, so as to reduce impact of digital signal noise on antenna operating performance, so as to resolve a technical problem of lossless digital signal noise transmission inside a mobile phone.

To understand the foregoing embodiments of this application more clearly, the following describes the terminal device with a noise suppression structure in more detail by using a specific embodiment. In this embodiment, for example, a noise suppression structure B is disposed on a display screen <NUM>.

Referring to <FIG>, <FIG>, and <FIG>, the middle frame <NUM> is a rectangular structure, and the first mounting location A is a rectangular groove structure. The display screen <NUM> includes the metal backplane <NUM> and a display component <NUM> mounted on a side of the metal backplane <NUM>, and the display component <NUM> is configured to display a picture. The display screen is mounted at the first mounting location of the middle frame <NUM>, and the display screen is fastened to the first mounting location of the middle frame <NUM> in a manner of adhesive or the like. The metal backplane <NUM> is disposed opposite to the metal middle plate <NUM>, and a first cavity <NUM> is generated between the metal backplane <NUM> and the first surface <NUM> of the metal middle plate <NUM>. Actually, the first cavity <NUM> is a slit in a tolerance that exists in an assembly process. In this embodiment, a processor of the mobile phone <NUM> is located at the bottom of the mobile phone, the antenna A is located at the top of the mobile phone, and the antenna is in a specific distance from the processor, and constitutes a transmission distance of digital signal noise. The first segment <NUM> is located at a middle location in a width direction of the metal backplane <NUM>, and the second segment <NUM> extends toward a top direction of the mobile phone. The middle location may be a region or may be a line. In this embodiment, the middle location of the metal backplane <NUM> is a region that coincides with an orthographic projection of the first segment <NUM>. It may also be understood that the first segment is a line, and the middle location is a middle line of the metal backplane. The bottom of the mobile phone <NUM> and the top of the mobile phone refer to directions of the mobile phone when a user answers a call.

Specifically, as shown in <FIG>, for example, a length L of the first cavity <NUM> of the mobile phone is <NUM>, a width H thereof is <NUM>, and a thickness of the cavity (a spacing between the first surface <NUM> and the metal backplane) is <NUM>. The through-slot <NUM> is a "U"-shaped slot, and the first segment <NUM> and the second segment <NUM> are rectangular through-slot structures. In this embodiment, the first segment <NUM> and the second segment <NUM> are disposed vertically. Sidewalls of the first segment <NUM> and the second segment <NUM> in the Y direction are of a planar structure, and it may be understood that a surface of the sidewall is a planar surface. A length l of the first segment <NUM> is <NUM>, and a length h of the second segment <NUM> is <NUM>. Therefore, slot widths of the first segment <NUM> and the second segment <NUM> are <NUM>, and slot widths are sizes perpendicular to a length direction of the first segment <NUM> and the second segment <NUM>. Referring to <FIG> and <FIG>, <FIG> is a simulation diagram of operation of a display screen of a terminal that is not provided with a noise suppression structure, and <FIG> is a simulation diagram of operation of a noise suppression structure in this embodiment. It may be learned from <FIG> that main-mode transmission of a cavity presents a full-pass characteristic, and noise whose frequency is higher than a cut-off frequency may be transmitted without loss in the first cavity. As shown in <FIG>, by implementing a "U-shaped" noise suppression structure at the middle location of the metal backplane <NUM> of the display screen <NUM>, a feature mode transmission characteristic of an original cavity is changed, so that electric field distribution and magnetic field distribution of noise at around a <NUM> frequency change when the noise is transmitted in the first cavity, thereby implementing cavity noise transmission suppression at a specific frequency. From simulation in <FIG>, it may be learned that a "U-shaped" hollow structure may generate a resonance point S11 (<NUM>) at a fixed frequency in the first cavity <NUM>, and S21 (<NUM>) corresponding to a sideband suppression effect of the "U-shaped" hollow structure may produce a suppression effect of more than 40B on noise transmission at a <NUM> frequency in the cavity. Further, a resonance frequency corresponding to a noise frequency can be generated in the cavity by adjusting a width of the "U-shaped" hollow structure (the through-slot <NUM>), a length of the first segment <NUM>, or a length of the second segment, so as to suppress cavity transmission of specific-frequency noise. For example, S11 (<NUM>) is to change the width of the through-slot from <NUM> to <NUM>, and the resonance frequency changes. Corresponding S21 (<NUM>) may produce a suppression effect of more than 40B on noise transmission at a <NUM> frequency in the cavity.

In another embodiment, referring to <FIG> and <FIG>, <FIG> is a schematic planar diagram of a metal backplane, and the noise suppression structure shown in <FIG> is applied thereto. For example, a length L of the first cavity <NUM> is <NUM>, a width H thereof is <NUM>, and a thickness of the cavity (a spacing between the first surface <NUM> and the metal backplane) is <NUM>. A difference between this embodiment and the embodiment in <FIG> is that there are two through-slots <NUM> in the foregoing embodiment, first segments <NUM> of the two through-slots <NUM> are spaced in parallel, and extension directions of second segments <NUM> of the two through-slots <NUM> are opposite. First segments <NUM> of the two through-slots <NUM> are spaced in parallel, and a spacing S is <NUM>. From simulation in <FIG>, it can be learned that the hollow structure formed by the two through-slots in this embodiment may generate fixed-frequency resonance points S1. <NUM> and S1.1_1 in the cavity, and the resonant points S1. <NUM> and S1.1_1 may suppress broadband noise transmission in a frequency range of <NUM>-<NUM> in the cavity by more than -<NUM> dB.

Referring to <FIG> is a diagram in which a through-slot array is disposed based on the embodiment shown in <FIG>, which is specifically the same as the noise suppression structure in the embodiment shown in <FIG>. The hollow region of the metal backplane <NUM> includes through-slot groups, and both one through-slot group Q1 and the other through-slot group Q2 include a first through-slot 21A and a second through-slot 21B. The first through-slot 21A is the same as the through-slot shown in <FIG>. A length l of the first segment 211A is <NUM>, and a length h of the second segment <NUM> is <NUM>. Therefore, slot widths of the first segment 211A and the second segment 212A are <NUM>. A length <NUM> of a first segment 211B of the second through-slot 21B in this embodiment is <NUM>, a length h1 of two second segments 212B is <NUM>, and a spacing s1 between the first through-slot 21A and the second through-slot 21B is <NUM>. A distance between the two through-slot groups is a distance between the two first through-slots, and a spacing is <NUM>, that is, a distance between the first segment 211A and the first segment 211B is <NUM>. Suppression of broadband noise may be enhanced by using a through-slot in an array form. From simulation in <FIG>, it can be learned that the hollow structure formed by the two through-slots in this embodiment may generate fixed-frequency resonance points S2. <NUM> and S2.1_1 in the cavity, and the resonant points S2. <NUM> and S2.1_1 may suppress broadband noise transmission in a frequency range of <NUM>-<NUM> in the cavity by more than -<NUM> dB. Noise suppression strength is increased by increasing the area of the hollow region.

In an embodiment, different from the foregoing embodiment, the noise suppression structure B on the metal backplane includes a plurality of slits C1 running through the metal backplane. The noise suppression structure shown in this embodiment is the noise suppression structure in the embodiment shown in <FIG>, but the structure is disposed on the metal backplane of the display screen. Each of the slits extends in a curved way, and the plurality of the slits C1 are regularly arranged to form the hollow region. In this embodiment, the slits extend in a serpentine shape, every two adjacent slits are symmetrically arranged, and every two adjacent slits are connected head to tail to form a group. An overall length direction of the slit C1 is consistent with the width direction of the metal backplane <NUM>. In this embodiment, a length of the first cavity <NUM> is <NUM>, a width of the first cavity is <NUM>, and a thickness of the cavity (a spacing between the first surface <NUM> and the metal backplane) is <NUM>. Correspondingly, the hollow region is a slit of nine groups of serpentine lines, a width of each group of serpentine line slits C1 is <NUM>, the group of slits has <NUM> bending locations, and the noise suppression structure B is located at the middle location of the metal middle plate <NUM>. Referring to <FIG> is a simulation diagram of a transmission frequency of digital signal noise in a cavity under the noise suppression structure B in this embodiment. A resonance frequency of the first cavity <NUM> presents an ultra-wideband characteristic, and has a suppression effect of <NUM>-<NUM> dB on wideband noise at around <NUM>. In this embodiment, by providing the metal backplane with a hollow region having a complex form and a large density, not only cavity transmission suppression for fixed-frequency noise can be implemented, but also cavity transmission suppression for ultra-wideband noise can be implemented.

Claim 1:
A terminal device (<NUM>), comprising an antenna, a middle frame (<NUM>), and a first component (<NUM>), wherein the middle frame (<NUM>) comprises a metal middle plate (<NUM>), the terminal device (<NUM>) comprises a metal bezel (<NUM>) disposed around a peripheral side of the metal middle plate (<NUM>), and the antenna is disposed on the metal bezel (<NUM>), the metal middle plate (<NUM>) comprises a first surface (<NUM>) and a second surface (<NUM>) opposite to the first surface (<NUM>), the first component (<NUM>) is mounted on the middle frame (<NUM>), and a first cavity (<NUM>) is formed between the first component (<NUM>) and the first surface (<NUM>);
the terminal device (<NUM>) comprises a noise suppression structure (B) disposed on the metal middle plate (<NUM>), the noise suppression structure (B) comprises a hollow region running through the first surface (<NUM>) and the second surface (<NUM>), and the hollow region communicates with the first cavity (<NUM>); and
the first cavity (<NUM>) is a transmission medium for digital signal noise having a propagation path in a direction toward the antenna, the propagation path passes through the hollow region, and the hollow region is configured to suppress the digital signal noise generated when the first component (<NUM>) is working and transmitted by using the propagation path, wherein the noise suppression structure (B) comprises a plurality of slits running through the metal middle plate (<NUM>), each of the slits extends in a curved way, and the plurality of slits are regularly arranged to form the hollow region, wherein the plurality of slits have consistent extension directions and are spaced, or the plurality of slits have consistent extension directions and are arranged side by side, and two adjacent slits communicate with each other head to tail.