WO2019223727A1

WO2019223727A1 - Terminal device antenna apparatus and implementation method

Info

Publication number: WO2019223727A1
Application number: PCT/CN2019/087992
Authority: WO
Inventors: 周闯柱; 王小明; 翁子彬
Original assignee: 中兴通讯股份有限公司
Priority date: 2018-05-23
Filing date: 2019-05-22
Publication date: 2019-11-28
Also published as: EP3799206A1; EP3799206A4; CN110534874A; CN110534874B

Abstract

Provided are a terminal device antenna apparatus and an implementation method therefor, relating to the field of antennas. The method comprises: dividing off, on a metallic floor of a terminal device main board, a fully enclosed non-metallic area configured to balance the current of the metallic floor; disposing an antenna topology unit in the divided off fully enclosed non-metallic area; and the antenna topology unit generating an operating current by using a radio frequency signal provided by the terminal device main board, and coupling the operating current to the metallic floor, so as to realize wideband impedance matching by means of local resonance multistage echo differential suppression.

Description

Terminal equipment antenna device and implementation method

Cross-reference to related applications

This application claims the priority of Chinese Patent Application No. 201810502731.4, entitled "A Terminal Equipment Antenna Device and Implementation Method", filed on May 23, 2018, the entire contents of which are incorporated herein by reference. .

Technical field

The present disclosure relates to the field of antennas, and in particular, to a terminal device antenna device and an implementation method.

Background technique

Most of the existing terminal devices use monopole antennas, Planar Inverted-F Antennas (PIFAs), and loop antennas. If these antennas need to meet the required frequency band, their physical size will be very large, and the bandwidth of a single type of antenna cannot meet the working requirements of terminal equipment communication. At present, for an antenna to cover the Long Term Evolution (LTE) frequency band, not only the antenna performance such as return loss, gain and efficiency of the antenna is required, but also the size of the antenna is required to be as small as possible. According to the antenna principle, the traditional antenna size needs to reach one-half or one-fourth of the working wavelength to work in resonance, which is difficult for small terminal equipment (such as wireless mobile terminals) to find a suitable space to place. These antennas, so the traditional antenna form can not meet the requirements of the antenna for wireless data transmission. Therefore, how to ensure that the antenna has a miniaturized and high-performance working state in a small-sized terminal device is an urgent problem to be solved.

The prior art provides a method for designing an antenna of a wireless terminal and a data card single board for the wireless terminal. The antenna design method includes: dividing a semi-closed area on the data card board of the wireless terminal without any metal wiring except for the antenna wiring; and coupling between the antenna wiring and the data card board . With this prior art, it is possible to achieve a wide-band operating bandwidth while reducing the specific absorption rate (SAR) value of the antenna. However, the shortcomings of the prior art include: the radiation area is a semi-closed area, which is greatly affected by the environment, the metal ground current is unbalanced, the current path has a large ohmic loss, and the anti-static discharge (ESD) effect is poor; The headroom requirement is large, the headroom is about 1/4 wavelength of the lowest working frequency, and the working frequency band is narrow.

Public content

An embodiment of the present disclosure provides a method for implementing a terminal device antenna device, including: dividing a fully-closed non-metal area configured to balance the metal ground current on a metal ground of a motherboard of the terminal device; and within the divided fully-closed non-metal area Arranging an antenna topology unit; the antenna topology unit uses a radio frequency signal provided by a motherboard of the terminal device to generate a working current, couples the working current to the metal ground, and uses a local resonance multi-stage echo differential suppression method, Achieve broadband impedance matching.

An embodiment of the present disclosure further provides a terminal device antenna device, including: a metal ground located on a main board of the terminal device and having a fully enclosed non-metallic area configured to balance the current of the metallic ground; an antenna topology unit arranged in the fully enclosed non-metallic In a metal area, a radio frequency signal provided by the main board of the terminal device is used to generate a working current, and the working current is coupled to the metal ground, and a local resonance multi-stage echo differential suppression method is used to achieve broadband impedance matching.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a flowchart of a method for implementing a terminal device antenna device according to an embodiment of the present disclosure;

2 is a schematic diagram of a connection structure between an antenna device and a terminal device according to an embodiment of the present disclosure;

3 is a schematic structural diagram of a terminal device antenna device according to an embodiment of the present disclosure;

4 is a schematic structural diagram of a terminal device antenna device according to an embodiment of the present disclosure;

5 is another schematic structural diagram of a terminal device antenna device according to an embodiment of the present disclosure;

6 is a schematic structural diagram of still another antenna device of a terminal device according to an embodiment of the present disclosure;

7 is an equivalent circuit diagram of a terminal device antenna device according to an embodiment of the present disclosure;

FIG. 8 is an S11 parameter diagram when the antenna device according to the embodiment of the present disclosure is applied to a terminal device; and

FIG. 9 is a radiation efficiency diagram when an antenna device according to an embodiment of the present disclosure is applied to a terminal device.

Detailed ways

The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the embodiments described below are only used to illustrate and explain the technical solutions of the present disclosure, and are not used to limit the protection scope of the present disclosure.

FIG. 1 is a flowchart of a method for implementing a terminal device antenna device according to an embodiment of the present disclosure. As shown in FIG. 1, a method for implementing a terminal antenna device according to an embodiment of the present disclosure includes the following steps S101 to S103.

Step S101: A fully enclosed non-metallic area configured to balance the current of the metal ground is divided on the metal ground of the main board of the terminal device.

Specifically, the terminal device motherboard may have at least two printed circuit layers, and a fully enclosed non-metallic area may be divided on a metal ground of each layer of the printed circuit layer of the terminal device motherboard. For example, if the terminal equipment main board has two top and bottom circuit layers, a fully enclosed non-metallic area is divided on the metal ground on the top layer of the terminal equipment main board, and a fully enclosed non-metallic area is divided on the metal ground floor of the terminal equipment main board Metal area. If there is (at least one) inner layer between the top layer and the bottom layer of the main board of the terminal device, a fully enclosed non-metallic area is also divided on the metal ground of each layer of the inner layer.

Step S102: Arrange the antenna topology unit in the completely enclosed non-metal area.

Specifically, the antenna topology unit is arranged in a fully enclosed non-metallic area of a metal ground of at least one printed circuit layer. For example, the antenna topology unit is arranged in at least one of a fully enclosed non-metallic region of a top metal ground, a fully enclosed non-metallic region of a bottom metallic ground, and a fully enclosed non-metallic region of an inner metallic ground.

The antenna topology unit may include: a first radiator with a gap between the terminal device main board; a second radiator, a third radiator, and a fourth radiator configured to generate an operating current; and a lumped element .

Step S103: the antenna topology unit uses a radio frequency signal provided by the motherboard of the terminal device to generate a working current, couples the working current to the metal ground, and implements a local resonance multi-stage echo differential suppression method to achieve broadband Impedance matching.

Specifically, when the antenna topology unit is in a local resonance state, an equivalent signal formed by the second radiator, the first radiator, and the fourth radiator generates an echo signal. An equivalent network formed by the third radiator, the lumped element, the metal ground, and the second radiator generates a reflected signal; and performs differential cancellation processing on the echo signal and the reflected signal to obtain a differential signal , The first radiator absorbs the differential signal, thereby achieving broadband impedance matching.

The method for implementing a terminal antenna device according to an embodiment of the present disclosure may further include: arranging on at least one of the first radiator, the second radiator, the third radiator, and the fourth radiator A first metal coupling sheet having a gap with the terminal device main board, and through the gap between the first metal coupling sheet and the terminal device main board, the first metal coupling sheet and the terminal device The main board is coupled; and / or a second metal coupling sheet with a gap between the antenna topological unit and the main board of the terminal device is arranged in the non-metallic area, and the second metal coupling sheet is connected to the terminal device through the second metal coupling sheet In the gap between the motherboards, the second metal coupling piece is coupled to the terminal equipment motherboard.

The radiation area of the terminal device antenna device implemented by the embodiments of the present disclosure is a fully enclosed area, which is less affected by the environment, the metal ground current presents a balanced current, and the radiation characteristics are good. Moreover, the "O" closed loop of the terminal device antenna device implemented by the embodiments of the present disclosure has a smaller ohmic impedance, smaller loss, higher radiation efficiency, and better anti-ESD (electrostatic discharge) effect than the "C" shaped loop current path.

In addition, the antenna headroom of the terminal device antenna device implemented by the embodiments of the present disclosure is small, and the headroom is approximately 0.05λx0.025λ (minimum operating frequency 698MHz), which is far less than 1/4 wavelength, and meets the Operating frequency band.

An embodiment of the present disclosure further provides a terminal device antenna device, including: a metal ground, located on a main board of the terminal device, and having a fully enclosed non-metallic area configured to balance the current of the metal ground; and an antenna topology unit disposed in the whole In a closed non-metallic area, a radio frequency signal provided by the motherboard of the terminal device is used to generate a working current, and the working current is coupled to the metal ground, and a local resonance multi-stage echo differential suppression method is used to achieve broadband impedance matching. .

Specifically, the terminal device motherboard may have at least two printed circuit layers, and each layer of the printed circuit layer may have a fully enclosed non-metallic area on a metal ground. For example, the metal ground specifically includes a top metal ground located on the top printed circuit layer of the terminal device motherboard and a bottom metal ground located on the bottom printed circuit layer of the terminal device motherboard. The top metal ground and the bottom metal ground both have Enclose non-metallic areas. If the motherboard of the terminal device has more than two printed circuit layers, that is, there is an inner layer (which has at least one printed circuit layer) between the top layer and the bottom layer, the metal floor also includes an inner layer of each of the printed circuit layers of the inner layer Metal ground.

In this case, the antenna topology unit is arranged in a fully enclosed non-metallic area of the metal ground of at least one printed circuit layer, such as a fully enclosed non-metallic area provided on the top metal ground or a fully enclosed non-metallic area provided on the top metal ground. Metal areas and fully enclosed non-metal areas such as inner metal ground.

When the antenna topology unit is in a local resonance state, an equivalent network formed by the second radiator, the first radiator, and the fourth radiator generates an echo signal, and the third radiation The equivalent network formed by the body, the lumped element, the metal ground, and the second radiator generates a reflection signal, and performs differential cancellation processing on the echo signal and the reflection signal to obtain a differential signal. The radiator absorbs the differential signal, thereby achieving broadband impedance matching.

The terminal device antenna device according to the embodiment of the present disclosure may further include a first metal coupling sheet disposed on at least one of the first radiator, the second radiator, the third radiator, and the fourth radiator, and There is a gap between the terminal equipment main boards, and the coupling with the terminal equipment main board is realized through the gap with the terminal equipment main board; and / or a second metal coupling sheet, which is arranged in an unarranged place There is a gap between the non-metallic area of the antenna topology unit and the main board of the terminal device, and the second coupling with the main board of the terminal device is realized through the gap with the main board of the terminal device.

The applications of the antenna device according to the embodiments of the present disclosure are listed below. The antenna device according to the embodiments of the present disclosure is applied to a motherboard of a terminal device as an example.

FIG. 2 is a schematic diagram of a connection structure of an antenna device and a terminal device according to an embodiment of the present disclosure, and FIG. 3 is a schematic diagram of a structure of a terminal device antenna device according to an embodiment of the present disclosure.

As shown in FIG. 2 and FIG. 3, the terminal device antenna device according to the embodiment of the present disclosure may be applied to terminal devices such as a notebook, a PC, and a PAD. The interface between the antenna device and the terminal device may be a USB interface, a PCMCIA interface (PC memory card interface), an Express interface, or other interfaces.

As an example, the terminal device antenna device of the embodiment of the present disclosure may include a main board 12 and a USB interface 3, which may be connected to a terminal device such as a notebook or a PC through the USB interface 3. The main board 12 may be a double-sided copper-clad dielectric board, for example, a dielectric board including a non-metallic material and a copper layer overlying the top and bottom layers of the dielectric board. For arranging the antenna topology unit 9. The remaining area on the main board 12 except the top non-metal area 4 and the bottom non-metal area 5 is a metal ground, and the top metal ground and the bottom metal ground are in common. For example, the size of each non-metallic region may be 11 mm × 21 mm × 2 mm.

FIG. 3 is a schematic structural diagram of a terminal device antenna device according to an embodiment of the present disclosure. As shown in FIG. 3, the terminal device antenna device according to the embodiment of the present disclosure may include a top metal ground 1 and a bottom metal ground 2. The top metal ground 1 may be a flat surface and is located on the front side of the motherboard 12. The bottom metal ground 2 may also be a flat surface, which is located on the bottom surface of the motherboard 12. The material of the main board 12 may include a non-metal material, and a region of the metal ground of the main board 12 may include a plurality of printed circuit layers. The terminal device antenna device according to the embodiment of the present disclosure may be connected to the terminal device through the USB interface 3.

The antenna topology unit 9 may be disposed on the top non-metal region 4 and / or the bottom non-metal region 5 of the top metal ground 1 of the main board 12. The top non-metallic region 4 and the bottom non-metallic region 5 can be any regular or irregular shape such as square, circle, diamond, trapezoid, triangle, etc., and are not limited to the rectangle shown in FIG. 2 and FIG. The shapes of the region 4 and the underlying non-metallic region 5 are not necessarily exactly the same. The feed port 11 of the antenna topology unit 9 is connected to a radio frequency signal output port provided by the main board 12, and the ground of the feed port 11 of the antenna topology unit 9 is connected to the metal ground of the main board 12.

FIG. 4 is a schematic structural diagram of a terminal device antenna device according to an embodiment of the present disclosure. As shown in FIG. 4, the antenna topology unit 9 may be arranged on the top non-metal region 4 and may include a first radiator 91, a second radiator 92, a third radiator 93, a fourth radiator 94, and a first lumped element. 7. The second lumped element 8, the third lumped element 10, and the first metal wall 6. The first radiator 91, the second radiator 92, the third radiator 93, and the fourth radiator 94 may be, but are not limited to, any regular or irregular shape such as a square, a circle, a diamond, a trapezoid, and a triangle. Printed or soldered on the top non-metallic area 4. As an example, the first radiator 91, the second radiator 92, and the fourth radiator 94 may all adopt rectangular radiation patches, and the third radiator 93 may employ an inductor bending line as shown in FIG. The third radiator 93 is coupled to the first radiator 91 through a fourth radiator 94. The third radiator 93 is connected to the short-circuited branch 95 through the third lumped element 10, and is connected to the top metal ground 1 through the short-circuited branch 95. The first metal wall 6 is connected to the top metal ground 1 through a first lumped element 7 and a second lumped element 8. The first lumped element 7, the second lumped element 8, and the third lumped element 10 may be one or a combination of devices such as capacitors, inductors, and resistors, and the parameters and distribution positions of these lumped elements may be adjusted, and the antenna may be adjusted. Resonance characteristics. A gap is left between the fourth radiator 94 and the top metal ground 1. The first radiator 91, the second radiator 92, the third radiator 93, the fourth radiator 94, and the first metal wall 6 are all made of a metal material.

Based on the terminal device antenna device of the embodiment of the present disclosure described above, during the transmission process, the radio frequency signal on the motherboard 12 is fed to the antenna topology unit 9 through the feeding port 11 to cause the antenna topology unit 9 to stimulate a working current. The working current is coupled to the top metal ground 1 and the bottom metal ground 2. The antenna topology unit 9 is equivalent to a resonant circuit. The working current flows into the top metal ground 1 and the bottom metal ground 2 through the shorting branch 95, thereby forming a complete radiation resonance. Circuit. Specifically, during the transmitting process, the radio frequency signal on the main board 12 is fed from the feeding port 11 to the second radiator 92, so that the second radiator 92 excites a current, and a part of the working current passes through the first radiator 91 Enter the fourth radiator 94 and the third radiator 93, and then enter the metal ground of the main board 12 through the third lumped element 10 and the short-circuit branch 95, and the other part of the working current passes through the first radiator 91 and the top metal ground The gap between 1 is coupled to the metal ground of the motherboard 12, forming a current loop.

FIG. 7 is an equivalent circuit diagram of a terminal device antenna device according to an embodiment of the present disclosure. As shown in FIG. 7, the second radiator 92 is equivalent to a first distributed inductance Lse, the first radiator 91 is equivalent to a radiation resistance Rse, and the first radiator 91 and the fourth radiator 94 generate a first coupling capacitance Cse, The third radiator 93 is equivalent to a second distributed inductance Lsh. A second coupling capacitor Csh and a radiative admittance Gr are generated between the second radiator 92 and the top metal ground 1. At the same time, the third lumped element 10 generates a lumped capacitance C1. . The lower frequency radio frequency energy enters the network composed of the first distributed inductor Lse and the first coupling capacitor Cse from the feed port 11 and enters the echo signal generated by the second distributed inductor Lsh, the second coupling capacitor Csh and the collector. The reflected signal generated by the network composed of the total capacitance C1 has an inverted phase difference, and the echo signal is prevented from entering the feed port 11 by performing multiple differential cancellations. Part of the irreversible differential signal is absorbed by the radiation resistance Rse and radiation admittance Gr equivalent of the first radiator 91 in the course of multiple reflections, thereby increasing the frequency bandwidth.

By appropriately adjusting the sizes of Lse, Cse, Lsh, Csh, and C1, the local resonance state of the entire antenna device can be controlled. By optimizing the shape and size of the first radiator 91, the second radiator 92, the third radiator 93, and the fourth radiator 94 in the antenna device structure, the gaps between the radiators and between the radiators and the main board 12 are optimized. The size of the antenna, as well as the parameters and distribution positions of the lumped elements, can adjust the resonance and matching state of the antenna device, and finally meet the requirement of completely covering the target bandwidth.

FIG. 5 is another schematic structural diagram of a terminal device antenna device according to an embodiment of the present disclosure. As shown in FIG. 5, the structure of the terminal device antenna device shown in FIG. 4 is different in that a metal coupling sheet 13 is provided on the third radiator 93, and a non-metal is used between the metal coupling sheet 13 and the antenna radiator. Medium or air medium. There is a gap between the metal coupling sheet 13 and the main board 12, and the metal coupling sheet 13 is coupled with the main board 12 through the gap, thereby achieving secondary coupling between the antenna radiator and the main board 12.

As shown in FIG. 5, the antenna topology unit 9 may be disposed on the top non-metal region 4 of the top metal ground 1 of the main board 12. The top non-metal region 4 may be any regular or irregular shape such as a square, a circle, a diamond, a trapezoid, and a triangle, and is not limited to the rectangle shown in FIG. 5. The feed port 11 of the antenna topology unit 9 is connected to a radio frequency signal output port provided by the main board 12, and the ground of the feed port 11 of the antenna topology unit 9 is connected to the metal ground of the main board 12.

As shown in FIG. 5, the antenna topology unit 9 may include a first radiator 91, a second radiator 92, a third radiator 93, a fourth radiator 94, a metal coupling sheet 13, a first lumped element 7, and a second The lumped element 8, the third lumped element 10 and the first metal wall 6. The first radiator 91, the second radiator 92, the third radiator 93, and the fourth radiator 94 may be, but are not limited to, any regular or irregular shape such as a square, a circle, a diamond, a trapezoid, and a triangle. Printed or soldered on the top non-metallic area 4. As an example, the first radiator 91, the second radiator 92, and the fourth radiator 94 may all adopt rectangular radiation patches, and the third radiator 93 may employ an inductor bending line as shown in FIG. The metal coupling sheet 13 may be, but is not limited to, any regular or irregular shape such as a square, a circle, a diamond, a trapezoid, and a triangle. For example, the metal coupling sheet 13 may be a rectangular metal sheet. The metal coupling sheet 13 may be disposed on all or part of the top antenna radiator, and is not limited to being disposed on only the third radiator 93 shown in FIG. 5. The third radiator 93 is coupled to the first radiator 91 through the fourth radiator 94, and the third radiator 93 is connected to the short-circuited branch 95 through the third lumped element 10, and is connected to the top metal ground 1 through the short-circuited branch 95. Connected. The third radiator 93 and the metal coupling sheet 13 may be completely insulated, or may be conductively connected by adding one or more conductive connection points at appropriate positions. The first metal wall 6 is connected to the top metal ground 1 through a first lumped element 7 and a second lumped element 8. The first lumped element 7, the second lumped element 8, and the third lumped element 10 may be one or a combination of devices such as capacitors, inductors, and resistors, and the parameters and distribution positions of these lumped elements may be adjusted, and the antenna may be adjusted. Resonance characteristics. A gap is left between the fourth radiator 94 and the top metal ground 1. The first radiator 91, the second radiator 92, the third radiator 93, the fourth radiator 94, the metal coupling sheet 13 and the first metal wall 6 may all be made of metal materials.

Based on the terminal device antenna device of the embodiment of the present disclosure described above, during the transmission process, the radio frequency signal on the main board 12 is fed from the feeding port 11 to the second radiator 92, so that the second radiator 92 excites a current, Part of the working current enters the fourth radiator 94 and the third radiator 93 through the first radiator 91, and then enters the metal ground of the main board 12 through the third lumped element 10 and the short-circuit branch 95, and another part of the working current One part is coupled to the metal ground of the main board 12 through a gap between the first radiator 91 and the top metal ground 1 to form a current loop. At the same time, multiple couplings are generated between the third radiator 93 and the metal coupling sheet 13 and the main board 12 through the gap, thereby generating multiple resonance points, which widens the working frequency band of the antenna.

By optimizing the shapes and sizes of the first radiator 91, the second radiator 92, the third radiator 93, the fourth radiator 94, and the metal coupling sheet 13 in the antenna device structure, the optimized radiators, the radiators and the The size of the gap between the main boards 12 and between the metal coupling sheet 13 and the antenna radiator, as well as optimizing the parameters and distribution positions of the lumped components, can adjust the resonance and matching state of the antenna device, and finally achieve a complete coverage of the target bandwidth. Claim.

FIG. 6 is another schematic structural diagram of a terminal device antenna device according to an embodiment of the present disclosure. As shown in FIG. 6, the structure of the terminal device antenna device shown in FIG. 4 is different: a metal coupling sheet 14 is provided in the non-metal region 5 on the bottom layer, and the metal coupling sheet 14 can be provided by printing or welding. Within the non-metallic region 5. There is a gap between the metal coupling sheet 14 and the main board 12, and the metal coupling sheet 14 is coupled with the main board 12 through the gap, thereby achieving secondary coupling between the antenna radiator and the main board 12.

As shown in FIG. 6, the antenna topology unit 9 may be disposed on the top non-metal region 4 of the top metal ground 1 of the main board 12, and the metal coupling sheet 14 may be disposed on the bottom non-metal region 5 of the bottom metal ground 2 of the main board 12. The top non-metallic region 4 and the bottom non-metallic region 5 may be any regular or irregular shape such as square, circle, diamond, trapezoid, triangle, etc., and are not limited to the rectangle shown in FIG. 6. The shape of the underlying non-metallic region 5 is not necessarily the same. The feed port 11 of the antenna topology unit 9 is connected to a radio frequency signal output port provided by the main board 12, and the ground of the feed port 11 of the antenna topology unit 9 is connected to the metal ground of the main board 12.

As shown in FIG. 6, the antenna topology unit 9 may include a first radiator 91, a second radiator 92, a third radiator 93, a fourth radiator 94, a metal coupling sheet 14, a first lumped element 7, and a second The lumped element 8, the third lumped element 10 and the first metal wall 6. The first radiator 91, the second radiator 92, the third radiator 93, and the fourth radiator 94 may be, but are not limited to, any regular or irregular shape such as a square, a circle, a diamond, a trapezoid, and a triangle. The printing or welding method is arranged on the top non-metal region 4 and the bottom non-metal region 5. As an example, the first radiator 91, the second radiator 92, and the fourth radiator 94 may each adopt a rectangular radiation patch, and the third radiator 93 may employ an inductor bending line shown in FIG. The metal coupling sheet 14 may be, but is not limited to, any regular or irregular shape such as a square, a circle, a diamond, a trapezoid, or a triangle. For example, the metal coupling sheet 14 may be a rectangular metal sheet printed on the non-metal region 5 at the bottom. The non-metallic medium is used for coupling with the top-level antenna radiator, and it can be set in the projection area of all or part of the top-level antenna radiator, and is not limited to the projection area set only in the top-level third radiator 93 shown in FIG. . The third radiator 93 is coupled to the first radiator 91 through the fourth radiator 94. The third radiator 93 is connected to the short-circuited branch 95 through the third lumped element 10, and is connected to the top metal ground 1 through the short-circuited branch 95. . The third radiator 93 and the metal coupling sheet 14 may be completely insulated, or a conductive connection may be implemented by adding one or more conductive connection points at an appropriate position. The first metal wall 6 is connected to the top metal ground 1 through a first lumped element 7 and a second lumped element 8. The first lumped element 7, the second lumped element 8, and the third lumped element 10 may be one or a combination of devices such as capacitors, inductors, and resistors, and the parameters and distribution positions of these lumped elements can be adjusted to adjust the antenna Resonance characteristics. A gap is left between the fourth radiator 94 and the top metal ground 1. The first radiator 91, the second radiator 92, the third radiator 93, the fourth radiator 94, the metal coupling sheet 14 and the first metal wall 6 may all be made of metal materials.

Based on the terminal device antenna device of the embodiment of the present disclosure described above, during the transmission process, the radio frequency signal on the main board 12 is fed from the feeding port 11 to the second radiator 92, so that the second radiator 92 excites a current, Part of the working current enters the fourth radiator 94 and the third radiator 93 through the first radiator 91, and then enters the metal ground of the main board 12 through the third lumped element 10 and the short-circuit branch 95, and another part of the working current One part is coupled to the metal ground of the main board 12 through a gap between the first radiator 91 and the top metal ground 1 to form a current loop. At the same time, the third radiator 93 and the metal coupling sheet 14 and the main board 12 are coupled multiple times through the gap, thereby generating multiple resonance points and widening the operating frequency band of the antenna.

By optimizing the shapes and sizes of the first radiator 91, the second radiator 92, the third radiator 93, the fourth radiator 94, and the metal coupling plate 14 in the antenna device structure, the optimized radiators, the radiators and the The size of the gap between the main boards 12 and between the metal coupling sheet 14 and the antenna radiator, as well as optimizing the parameters and distribution positions of the lumped components, can adjust the resonance and matching state of the antenna device, and finally achieve a complete coverage of the target bandwidth Claim.

In summary, the antenna device according to the embodiment of the present disclosure provides a non-metallic region including only an antenna radiator, a metal coupling sheet, and a slot on the main board, and optimizes the shape of the non-metallic region and the non-metallic region. Elements, and ultimately achieve the requirements of full coverage of the target frequency band.

The shape of each antenna radiator of the embodiment of the present disclosure is not limited to the shape shown in the drawings, and the size of the radiators and the size of the gap between the radiators are not limited to the sizes shown in the drawings.

The shape of the non-metallic region of the embodiment of the present disclosure may be any regular or irregular shape, and is not limited to the shape shown in the drawings. The shape of the non-metallic region on the top layer of the motherboard and the shape of the non-metallic region on the bottom layer of the motherboard are also not limited. Need to be exactly the same.

The resonant network in the embodiments of the present disclosure may be composed of an inductor or a capacitor, or a combination of an inductor and a capacitor may be used.

The antenna device of the embodiment of the present disclosure is not limited to operate in the frequency band range described in the embodiments of the present disclosure. The size of the antenna can be adjusted according to requirements to meet the requirements of the operating frequency band.

FIG. 8 is an S11 parameter diagram when the antenna device according to the embodiment of the present disclosure is applied to a terminal device. The antenna device covers the required LTE frequency bands from 698MHz to 960MHz and 1710MHz to 2690MHz, which meets the requirements for high performance of the antenna.

FIG. 9 is a radiation efficiency diagram when an antenna device according to an embodiment of the present disclosure is applied to a terminal device. The radiation efficiency of the antenna device in the low frequency band is greater than 60%, and the radiation efficiency in the high frequency band is greater than 60%. It can be seen that the antenna device covers the required LTE frequency bands from 698MHz to 960MHz and 1710MHz to 2690MHz, so it has the characteristics of high efficiency and meets the requirements of high performance of the antenna.

In summary, the antenna device according to the embodiment of the present disclosure has the following technical effects: The metal enclosure structure is used to achieve a fully enclosed radiation area, and the metal ground current is balanced. The metal enclosure structure is used to achieve "O "" Closed loop, smaller than ohmic impedance of the current path of the "C" loop, less loss, high radiation efficiency, and good anti-ESD effect; through the local resonance multi-order echo differential suppression method, miniaturization and high reactance are realized. The wide-band impedance matching reduces the antenna headroom. The headroom is about 0.05λ × 0.025λ (minimum operating frequency 698MHz), which is far less than 1/4 wavelength, and covers the wide frequency bands of LTE698MHz-960MHz and 1710MHz-2690MHz.

Although some embodiments of the present disclosure have been described in detail above, the present disclosure is not limited thereto, and those skilled in the art can make various modifications according to the principles of the present disclosure. Therefore, any modification made in accordance with the principles of this disclosure should be understood to fall within the protection scope of this disclosure.

Claims

A method for implementing a terminal device antenna device includes:

A fully enclosed non-metallic area configured to balance the current of the metal ground is divided on the metal ground of the motherboard of the terminal device;

Arranging antenna topology elements in the divided fully enclosed non-metallic area; and

The antenna topology unit uses a radio frequency signal provided by the main board of the terminal device to generate a working current, couples the working current to the metal ground, and uses a local resonance multi-stage echo differential suppression method to achieve broadband impedance matching.
The method according to claim 1, wherein the main board of the terminal device has at least two printed circuit layers, and dividing a fully enclosed non-metallic area configured to balance the current of the metal ground on the metal ground of the main board of the terminal device comprises:

A fully enclosed non-metallic area is divided on the metal ground of each layer of the printed circuit layer of the main board of the terminal device.
The method according to claim 2, wherein arranging the antenna topology unit in the divided fully enclosed non-metallic area comprises:

The antenna topology unit is arranged in a totally enclosed non-metallic area of at least one printed circuit layer.
The method according to claim 2, wherein a metal ground of each printed circuit layer of the main board of the terminal device is common ground.
The method according to any one of claims 1 to 4, wherein the antenna topology unit comprises: a first radiator having a gap with a motherboard of the terminal device; and a second radiator configured to generate the working current. A radiator, a third radiator, and a fourth radiator; and a lumped element,

The antenna topology unit uses a radio frequency signal provided by the main board of the terminal device to generate a working current, and couples the working current to the metal ground. Using a local resonance multi-stage echo differential suppression method to achieve broadband impedance matching includes :

When the antenna topology unit is in a local resonance state, an equivalent network formed by the second radiator, the first radiator, and the fourth radiator generates an echo signal, and the third radiation An equivalent network formed by the body, the lumped element, the metal ground, and the second radiator generates a reflected signal;

Perform differential cancellation processing on the echo signal and the reflected signal to obtain a differential signal, and the first radiator absorbs the differential signal, thereby achieving broadband impedance matching.
The method according to claim 5, further comprising:

A first metal coupling sheet having a gap between the first radiator, the second radiator, the third radiator, and the fourth radiator and a main board of the terminal device is arranged on at least one of the first radiator, the second radiator, the third radiator, and the fourth radiator. Through the gap between the first metal coupling sheet and the terminal device motherboard, the first metal coupling sheet is coupled with the terminal device motherboard; and / or

A second metal coupling sheet with a gap between the antenna topological unit and the motherboard of the terminal device is arranged in the non-metallic area where the antenna topology unit is not arranged, and the gap between the second metal coupling sheet and the motherboard of the terminal device is passed through , The second metal coupling piece is coupled to the terminal device motherboard.
A terminal equipment antenna device includes:

A metal ground, located on the motherboard of the terminal, with a fully enclosed non-metallic area configured to balance the current of the metal ground; and

The antenna topology unit is arranged in the fully enclosed non-metallic area, and uses a radio frequency signal provided by the main board of the terminal device to generate a working current, and couples the working current to the metal ground, and utilizes a local resonance multi-stage return Wave differential suppression method to achieve broadband impedance matching.
The device according to claim 7, wherein the main board of the terminal device has at least two printed circuit layers, and each layer of the printed circuit layer has a fully enclosed non-metal area on a metal ground.
The device according to claim 8, wherein the antenna topology unit is disposed in a fully enclosed non-metallic area of a metal ground of at least one printed circuit layer.
The device according to claim 8, wherein a metal ground of each printed circuit layer of the main board of the terminal device is common ground.
The device according to claim 7, wherein the antenna topology unit comprises: a first radiator having a gap with the main board of the terminal device; a second radiator and a third radiator configured to generate the working current; And fourth radiator; and lumped elements,

When the antenna topology unit is in a local resonance state, an equivalent network formed by the second radiator, the first radiator, and the fourth radiator generates an echo signal, and the third radiation The equivalent network formed by the body, the lumped element, the metal ground, and the second radiator generates a reflection signal, and performs differential cancellation processing on the echo signal and the reflection signal to obtain a differential signal. The radiator absorbs the differential signal, thereby achieving broadband impedance matching.
The apparatus according to claim 11, further comprising:

The first metal coupling sheet is arranged on at least one of the first radiator, the second radiator, the third radiator, and the fourth radiator, and a gap exists between the terminal radiator and the main board of the terminal device, and The gap between the terminal equipment main boards to achieve coupling with the terminal equipment main boards; and / or

The second metal coupling piece is arranged in a non-metallic area where the antenna topology unit is not arranged, and a gap exists between the terminal equipment main board and the gap between the second metal coupling piece and the terminal equipment main board. Secondary coupling of the main board of the terminal equipment.