CN110534874B - Terminal equipment antenna device and implementation method - Google Patents
Terminal equipment antenna device and implementation method Download PDFInfo
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- CN110534874B CN110534874B CN201810502731.4A CN201810502731A CN110534874B CN 110534874 B CN110534874 B CN 110534874B CN 201810502731 A CN201810502731 A CN 201810502731A CN 110534874 B CN110534874 B CN 110534874B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
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Abstract
The invention discloses an antenna device of terminal equipment and an implementation method, which relate to the field of antennas, and the method comprises the following steps: dividing a totally-enclosed non-metal area for balancing the metal ground current on the metal ground of a main board of the terminal equipment; arranging antenna topological units in the divided totally-enclosed nonmetal areas; the antenna topology unit obtains working current by using radio frequency signals provided by the terminal equipment mainboard, couples the working current to the metal ground, and realizes broadband impedance matching by using a local resonance multi-order echo differential suppression mode. The embodiment of the invention solves the technical problem that a plurality of wide frequency bands can not work simultaneously under the limited size in the prior art, and simultaneously greatly improves the electromagnetic compatibility characteristic.
Description
Technical Field
The present invention relates to the field of antennas, and in particular, to an antenna apparatus for a terminal device and an implementation method thereof.
Background
Most conventional wireless mobile terminals employ monopole antennas, Planar Inverted-F antennas (PIFAs), loop antennas, and the like. These antennas are physically large in size to meet the frequency band to be covered, and the bandwidth of a single type of antenna cannot meet the operational requirements of wireless mobile terminal communications. At present, for the design of an antenna to cover a Long Term Evolution (LTE) frequency band, the antenna is required to have good performance such as return loss, gain and efficiency, and the size as small as possible. According to the antenna principle, the size of the traditional antenna needs to reach one half or one quarter of the working wavelength to work in a resonant mode, and it is difficult for the wireless mobile terminal with small size to find a proper space for placing the antennas, so that the traditional antenna form cannot meet the requirements of wireless data transmission on the antennas. Therefore, how to ensure the antenna to have a miniaturized and high-performance working state in a small-sized wireless mobile terminal is an urgent problem to be solved.
The prior art provides an antenna design method of a wireless terminal and a data card single board. Dividing a semi-closed area without other metal wiring on a data card single board of a wireless terminal; and coupling the antenna wire and the data card single board. Also discloses a data card veneer of the wireless terminal. By the prior art, the Specific Absorption Rate (SAR) value of the antenna can be reduced, and the broadband working bandwidth can be realized. The defects of the prior art are as follows:
1. the radiation area is a semi-closed area, and is greatly influenced by the environment, the metal ground current is unbalanced, the ohmic loss of a current path is large, and the effect of electrostatic discharge (ESD) is poor.
2. The radiation antenna has large headroom requirement, the headroom is about 1/4 wavelengths of the lowest working frequency, and the working frequency band is narrow.
Disclosure of Invention
The embodiment of the invention provides an antenna device of terminal equipment and an implementation method, which solve the problem that a plurality of wide frequency bands cannot simultaneously work under a limited size in the prior art.
The method for implementing the antenna device of the terminal equipment provided by the embodiment of the invention comprises the following steps:
dividing a totally-enclosed non-metal area for balancing the metal ground current on the metal ground of a main board of the terminal equipment;
arranging antenna topological units in the divided totally-enclosed nonmetal areas;
the antenna topology unit generates working current by using radio frequency signals provided by the terminal equipment mainboard, couples the working current to the metal ground, and realizes broadband impedance matching by using a local resonance multi-order echo differential suppression mode.
Preferably, the terminal device main board has at least two printed circuit layers, and the dividing of the metal ground of the terminal device main board into the fully-enclosed non-metal region for balancing the metal ground current includes:
and a totally-enclosed non-metal area is divided on the metal ground of each printed circuit layer of the main board of the terminal equipment.
Preferably, the arranging the antenna topology units in the divided totally-enclosed non-metal areas comprises:
the antenna topology unit is arranged in a totally enclosed non-metallic area of the metallic ground of at least one printed circuit layer.
Preferably, the antenna topology unit includes: the antenna topology unit obtains the working current by using the radio frequency signal provided by the terminal device mainboard, and couples the working current to the metal ground, and realizes broadband impedance matching by using a local resonance multi-order echo differential suppression mode, including:
during the antenna topological 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 an equivalent network formed by the third radiator, the lumped element, the metal ground and the second radiator generates a reflection signal;
and carrying out differential cancellation processing on the echo signal and the reflection signal to obtain a differential signal, and absorbing the differential signal by using a first radiator so as to realize broadband impedance matching.
Preferably, the method further comprises the following steps:
arranging a first metal coupling sheet with a gap between the first metal coupling sheet and the terminal equipment mainboard on at least one of the first radiator and the fourth radiator, and coupling the first metal coupling sheet with the terminal equipment mainboard through the gap between the first metal coupling sheet and the terminal equipment mainboard; and/or
And arranging a second metal coupling sheet with a gap between the non-metal area without the antenna topological unit and the terminal equipment mainboard, and coupling the second metal coupling sheet with the terminal equipment mainboard through the gap between the second metal coupling sheet and the terminal equipment mainboard.
According to an embodiment of the present invention, an antenna apparatus for a terminal device includes:
the metal ground is positioned on the terminal equipment main board and is provided with a fully-closed non-metal area for balancing the metal ground current;
and the antenna topology unit is arranged in the totally-enclosed nonmetal area and used for generating working current by utilizing the radio-frequency signal provided by the terminal equipment mainboard, coupling the working current to the metal ground and realizing broadband impedance matching by utilizing a local resonance multi-order echo differential suppression mode.
Preferably, the terminal equipment main board is provided with at least two printed circuit layers, and the metal ground of each printed circuit layer is provided with a fully-closed non-metal area.
Preferably, the antenna topology unit is arranged in a totally enclosed non-metallic area of the metallic ground of at least one printed circuit layer.
Preferably, the antenna topology unit includes: and a first radiator, a second radiator, a third radiator, a fourth radiator and a lumped element, wherein a gap exists between the terminal device main boards, the first radiator, the third radiator, the fourth radiator and the lumped element are used for generating the working current, during the antenna topology unit is in a local resonance state, an echo signal is generated by an equivalent network formed by the second radiator, the first radiator and the fourth radiator, a reflection signal is generated by the equivalent network formed by the third radiator, the lumped element, the metal ground and the second radiator, the echo signal and the reflection signal are subjected to differential cancellation processing to obtain a differential signal, and the differential signal is absorbed by the first radiator, so that broadband impedance matching is realized.
Preferably, the method further comprises the following steps:
the first metal coupling sheet is arranged on at least one of the first radiator, the second radiator and the terminal equipment main board, and a gap exists between the first metal coupling sheet and the terminal equipment main board, so that the first metal coupling sheet is coupled with the terminal equipment main board through the gap between the first metal coupling sheet and the terminal equipment main board; and/or
And the second metal coupling sheet is arranged in a non-metal area where the antenna topological unit is not arranged, a gap exists between the second metal coupling sheet and the terminal equipment mainboard, and the second metal coupling sheet is used for realizing secondary coupling with the terminal equipment mainboard through the gap between the second metal coupling sheet and the terminal equipment mainboard.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the miniaturized terminal equipment antenna device provided by the embodiment of the invention is a PCB printed miniaturized wireless terminal antenna device which can meet the requirement that terminal equipment covers LTE full frequency bands, can solve the technical problem that a plurality of wide frequency bands cannot work simultaneously under limited size in the prior art, and simultaneously greatly improves the electromagnetic compatibility characteristic.
Drawings
Fig. 1 is a flowchart of an implementation method of an antenna apparatus of a terminal device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a connection structure of a wireless terminal and an antenna device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an antenna device of a terminal device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an antenna structure of a first terminal device according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an antenna structure of a second terminal device according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an antenna structure of a third terminal device according to an embodiment of the present invention;
fig. 7 is an equivalent circuit diagram of a terminal device provided in an embodiment of the present invention;
fig. 8 is a diagram of S11 parameters when applied to an antenna of a wireless terminal according to an embodiment of the present invention;
fig. 9 is a radiation efficiency diagram when applied to an antenna of a wireless terminal according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described below are only for the purpose of illustrating and explaining the present invention, and are not to be construed as limiting the present invention.
Fig. 1 is a flowchart of an implementation method of an antenna apparatus of a terminal device according to an embodiment of the present invention, and as shown in fig. 1, the steps include:
step S101: and a totally-enclosed non-metal area for balancing the metal ground current is divided on the metal ground of the main board of the terminal equipment.
Step S101 includes: the terminal equipment main board is provided with at least two printed circuit layers, and a totally-enclosed non-metal area is divided on the metal ground of each printed circuit layer of the terminal equipment main board. For example, if the terminal device main board has two circuit layers, namely a top layer and a bottom layer, a fully-enclosed non-metal region is divided on the metal ground of the top layer of the terminal device main board, and a fully-enclosed non-metal region is divided on the metal ground of the bottom layer of the terminal device main board. If an inner layer (at least one layer) is arranged between the top layer and the bottom layer of the main board of the terminal equipment, each layer of metal ground on the side of the inner layer is also divided into a totally-enclosed non-metal area.
Step S102: and arranging antenna topological units in the divided totally-enclosed non-metal areas.
Step S102 includes: the antenna topology unit is arranged in a totally enclosed non-metallic area of the metallic ground of at least one printed circuit layer. For example, the antenna topology units are arranged in the totally enclosed non-metallic region of the top layer metallic ground and/or the totally enclosed non-metallic region of the bottom layer metallic ground and/or the totally enclosed non-metallic region of the inner layer metallic ground.
The antenna topology unit includes: and the terminal equipment comprises a first radiator, a second radiator, a third radiator, a fourth radiator and a lumped element, wherein a gap exists between the terminal equipment and the mainboard, and the second radiator, the third radiator and the fourth radiator are used for generating the working current.
Step S103: the antenna topology unit generates working current by using radio frequency signals provided by the terminal equipment mainboard, couples the working current to the metal ground, and realizes broadband impedance matching by using a local resonance multi-order echo differential suppression mode.
Step S103 includes: during the antenna topological 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 an equivalent network formed by the third radiator, the lumped element, the metal ground and the second radiator generates a reflection signal; and carrying out differential cancellation processing on the echo signal and the reflection signal to obtain a differential signal, and absorbing the differential signal by using a first radiator so as to realize broadband impedance matching.
The method further comprises the following steps: arranging a first metal coupling sheet with a gap between the first metal coupling sheet and the terminal equipment mainboard on at least one of the first radiator and the fourth radiator, and coupling the first metal coupling sheet with the terminal equipment mainboard through the gap between the first metal coupling sheet and the terminal equipment mainboard; and/or a second metal coupling sheet with a gap between the non-metal area without the antenna topological unit and the terminal equipment mainboard is arranged, and the second metal coupling sheet is coupled with the terminal equipment mainboard through the gap between the second metal coupling sheet and the terminal equipment mainboard.
The radiation area of the terminal antenna is a fully-enclosed area, the influence of the environment is small, the metal ground current presents balanced current, and the radiation characteristic is good. The O-shaped closed loop has lower ohmic impedance, lower loss and higher radiation efficiency than the C-shaped loop. The fully closed structure has good ESD (electrostatic discharge) resistance effect.
The radiation antenna of the embodiment of the invention has small headroom which is about 0.05 lambda 0.025 lambda (the lowest working frequency of 698MHz) and is far less than 1/4 wavelengths, thereby meeting the requirements of LTE698-960MHz &1710-2690MHz working frequency band.
An embodiment of the present invention further provides an antenna apparatus for a terminal device, including:
and the metal ground is positioned on the main board of the terminal equipment and is provided with a fully-closed non-metal area for balancing the metal ground current. The terminal equipment main board is provided with at least two printed circuit layers, and the metal ground of each printed circuit layer is provided with a totally-enclosed non-metal area. For example, the metal ground specifically includes a top metal ground located on a top printed circuit layer of the terminal device main board and a bottom metal ground located on a bottom printed circuit layer of the terminal device main board, and both the top metal ground and the bottom metal ground have fully-enclosed non-metal regions. If the terminal equipment main board has more than two printed circuit layers, namely an inner layer (which has at least one printed circuit layer) exists between the top layer and the bottom layer, the metal ground also comprises an inner metal ground of each printed circuit layer of the inner layer.
The antenna topological unit is arranged in the totally-enclosed non-metal area, specifically can be arranged in the totally-enclosed non-metal area of the top metal ground and/or the totally-enclosed non-metal area of the bottom metal ground, and is used for generating working current by utilizing radio-frequency signals provided by a terminal equipment mainboard, coupling the working current to the metal ground, and realizing broadband impedance matching by utilizing a local resonance multi-order echo differential suppression mode. The antenna topological unit is arranged in a totally-enclosed non-metal area of a metal ground of at least one printed circuit layer, such as a totally-enclosed non-metal area of a top-layer metal ground, or a totally-enclosed non-metal area of the top-layer metal ground and a totally-enclosed non-metal area of an inner-layer metal ground. Wherein the antenna topology unit comprises: and a first radiator, a second radiator, a third radiator, a fourth radiator and a lumped element, wherein a gap exists between the terminal device main boards, the first radiator, the third radiator, the fourth radiator and the lumped element are used for generating the working current, during the antenna topology unit is in a local resonance state, an echo signal is generated by an equivalent network formed by the second radiator, the first radiator and the fourth radiator, a reflection signal is generated by the equivalent network formed by the third radiator, the lumped element, the metal ground and the second radiator, the echo signal and the reflection signal are subjected to differential cancellation processing to obtain a differential signal, and the differential signal is absorbed by the first radiator, so that broadband impedance matching is realized.
Further, still include:
the first metal coupling sheet is arranged on at least one of the first radiator, the second radiator and the terminal equipment main board, and a gap exists between the first metal coupling sheet and the terminal equipment main board, so that the first metal coupling sheet is coupled with the terminal equipment main board through the gap between the first metal coupling sheet and the terminal equipment main board; and/or
And the second metal coupling sheet is arranged in a non-metal area where the antenna topological unit is not arranged, a gap exists between the second metal coupling sheet and the terminal equipment mainboard, and the second metal coupling sheet is used for realizing secondary coupling with the terminal equipment mainboard through the gap between the second metal coupling sheet and the terminal equipment mainboard.
The following exemplifies application of the antenna device according to the embodiment of the present invention, and the application of the antenna device according to the embodiment of the present invention to a main board of a terminal wireless terminal product is taken as an example.
Fig. 2 is a schematic diagram of a connection structure of a wireless terminal and an antenna device according to an embodiment of the present invention, and fig. 3 is a schematic diagram of a structure of an antenna device of a terminal device according to an embodiment of the present invention, as shown in fig. 2 and fig. 3.
The antenna device of the terminal equipment is used for wireless terminal products of digital products such as notebooks, PCs, PADs and the like. The interface of the wireless terminal may be a USB interface, a PCMCIA interface (PC memory card interface), an Express interface or other electronic device interface.
The wireless terminal comprises a mainboard 12 and a USB interface 3, and is connected with equipment such as a notebook computer, a PC and the like through the USB interface 3 at the tail end when in use. The mainboard 12 of the wireless terminal product is a double-layer copper-clad dielectric plate made of non-metal materials, and a top non-metal area 4 and a bottom non-metal area 5 are reserved in the middle of the mainboard of the wireless terminal product for an antenna topological unit 9. The area of the main board left by removing the non-metal area is a metal ground. And the metal grounds of the top and bottom layers of the wireless terminal product are to be common. The size of the antenna area is 11mm × 21mm × 2 mm.
Example 1
Fig. 3 is a schematic structural diagram of an antenna apparatus of a terminal device according to an embodiment of the present invention, as shown in fig. 3, the antenna apparatus includes a top metal ground 1, and the top metal ground 1 is a plane and is located on a front surface of a main board 12 of the terminal device. The bottom metal ground 2 is located on the bottom surface of the main board 12. The antenna terminal device main board 12 is made of a non-metal material, and a metal area of the terminal device main board 12 includes a plurality of printed circuit layers. The USB interface 3 is connected with other digital equipment.
The antenna topology unit 9 is laid around the top non-metal area 4 of the top metal ground 1 and the bottom non-metal area 5 of the bottom metal ground 2 of the terminal equipment main board 12. The top non-metal area 4 and the bottom non-metal area 5 may be any regular or irregular shape such as a square, a circle, a diamond, a trapezoid, a triangle, etc., and are not limited to the rectangle shown in fig. 2 of the embodiment, and the shapes of the top non-metal area 4 and the bottom non-metal area 5 are not necessarily identical. The feed port 11 of the antenna topology unit 9 is connected with the rf signal output port provided by the terminal device motherboard, and the ground of the feed port 11 of the antenna topology unit 9 is connected with the metal ground of the terminal device motherboard.
Fig. 4 is a schematic diagram of an antenna structure of a first terminal device according to an embodiment of the present invention, and as shown in fig. 4, an antenna topology unit 9 includes: top first radiator 91, top second radiator 92, top third radiator 93, top fourth radiator 94, first lumped element 7, second lumped element 8, third lumped element 10 and first metal wall 6. The top first radiator 91, the top second radiator 92, the top third radiator 93 and the top fourth radiator 94 may be, but not limited to, square, circular, diamond, trapezoid, triangle, or any regular or irregular planar distribution, and are disposed in the non-metal region by printing or welding. In this embodiment, the top first radiator 91, the top second radiator 92 and the top fourth radiator 94 all use rectangular radiating patches, and the top third radiator 93 uses a segment of the inductance meander line shown in fig. 2. The top third radiator 93 is coupled to the top first radiator 91 through the top fourth radiator 94. The top layer third radiator 93 is connected to the short-circuit stub 95 via the third lumped element 10 and to the top layer metal ground 1 via the short-circuit stub 95. The first metal wall 6 is connected to the top layer metal ground 1 by means of first and second lumped elements. Wherein, the first lumped element 7, the second lumped element 8 and the third lumped element 10 may be one or a combination of capacitance, inductance, resistance, etc., and the resonant characteristics of the antenna may be further adjusted by adjusting the parameters and distribution positions of the lumped elements. A gap remains between the top fourth radiator 94 and the top metal ground 1. The top first radiator 91, the top second radiator 92, the top third radiator 93, the top fourth radiator 94 and the first metal wall 6 are made of metal materials.
Based on the above-described antenna apparatus of the terminal device of this embodiment, in the transmission process, the radio frequency signal on the main board of the terminal device is fed into the top layer antenna topology unit 9 through the feeding port 11, so that the antenna topology unit 9 excites the working current, and the working current is coupled to the top layer metal ground 1 and the bottom layer metal ground 2, where the antenna topology unit 9 is equivalent to a resonant circuit, and then flows into the top layer metal ground 1 and the bottom layer metal ground 2 through the short-circuit branch, thereby forming a complete radiation resonant circuit. Specifically, during the transmission process, the radio frequency signal on the terminal device board 12 is fed from the feeding port 11 to the top-layer second radiator 92, so that the top-layer second radiator 92 excites a current, and a portion of the working current enters the top-layer fourth radiator 94 and the top-layer third radiator 93 through the top-layer first radiator 91, and then enters the metal ground of the board through the third lumped element 10 and the short-circuit branch 95. Another part of the current is coupled to the metal ground of the motherboard through the gap between the top first radiator 91 and the top metal ground 1, forming a current loop.
Fig. 7 is an equivalent circuit diagram of a terminal device provided in an embodiment of the present invention, as shown in fig. 7. The top-layer second radiator 92 is equivalent to a first distributed inductance Lse, the top-layer first radiator is equivalent to a radiation resistance Rse, and the top-layer first radiator and the top-layer fourth radiator generate a first coupling capacitance Cse. The top layer third radiator is equivalent to a second distributed inductance Lsh. A second coupling capacitance Csh, and a radiation admittance Gr is created between the top second radiator and the top metal ground 1, while the third lumped element creates a lumped capacitance C1. The echo signal generated when the radio frequency energy with lower frequency enters the network formed by the first distributed inductor Lse and the first coupling capacitor Cse from the feed port 11 has a phase difference opposite to the reflected signal generated by the network formed by the second distributed inductor Lsh, the second coupling capacitor Csh and the collective capacitor C1, and multiple differential cancellation is performed, so that the echo signal is prevented from entering the feed port 11. Part of the differential signals which cannot be counteracted are absorbed by the radiation resistor Rse and the radiation admittance Gr through the first radiator in the process of multiple reflections, and the frequency bandwidth is further increased.
In implementation, the local resonance state of the whole antenna device can be controlled by mainly and properly adjusting the sizes of Lse, Cse, Lsh, Csh and C1. During implementation, the resonance and matching states of the antenna device can be adjusted by optimizing the shapes and sizes of the first radiator 91, the second radiator 92, the third radiator 93 and the fourth radiator 94 in the structure of the antenna device, optimizing the sizes of coupling gaps between the radiators and a data card mainboard, and optimizing the parameters and distribution positions of lumped elements, and finally achieving the requirement of completely covering a target bandwidth.
Example 2
Fig. 5 is a schematic diagram of an antenna structure of a second terminal device according to an embodiment of the present invention, and as shown in fig. 5, the present embodiment is different from embodiment 1 in that: a metal coupling sheet 13 is arranged on the third radiator 93 on the top layer of the antenna, and a non-metal medium or an air medium between the printed layers is adopted for coupling between the metal coupling sheet 13 and the antenna radiator. There is a gap between the metal coupling piece 13 and the data card motherboard 12, and the metal coupling piece 13 and the data card motherboard 12 are coupled through the gap, so as to realize secondary coupling between the antenna radiator and the data card motherboard 12.
As shown in fig. 3, the antenna topology unit 9 is laid around the top non-metal area 4 of the top metal ground 1 and the bottom non-metal area 5 of the bottom metal ground 2 of the terminal device main board 12. The top non-metal area 4 and the bottom non-metal area 5 may be any regular or irregular shape such as a square, a circle, a diamond, a trapezoid, a triangle, etc., and are not limited to the rectangle shown in fig. 4 in this embodiment, and the shapes of the top non-metal area 4 and the bottom non-metal area 5 are not necessarily identical. The feed port 11 of the antenna topology unit 9 is connected with the rf signal output port provided by the terminal device motherboard, and the ground of the feed port 11 of the antenna topology unit 9 is connected with the metal ground of the terminal device motherboard.
As shown in fig. 5, the antenna topology unit 9 includes: top layer first radiator 91, top layer second radiator 92, top layer third radiator 93, top layer fourth radiator 94, metal radiating patch 13, first lumped element 7, second lumped element 8, third lumped element 10 and first metal wall 6. The top first radiator 91, the top second radiator 92, the top third radiator 93 and the top fourth radiator 94 may be, but not limited to, square, circular, diamond, trapezoid, triangle, or any regular or irregular planar distribution, and are disposed in the non-metal region by printing or welding. In this embodiment, the top first radiator 91, the top second radiator 92 and the top fourth radiator 94 all use rectangular radiating patches, and the top third radiator 93 uses a segment of the inductance meander line shown in fig. 2. The metal radiation patch 13 may be, but not limited to, any regular or irregular shape such as a square, a circle, a diamond, a trapezoid, a triangle, etc., and in this embodiment, the metal radiation patch 13 is a rectangular metal sheet. The metal coupling sheet 13 may be used to patch all or part of the top antenna radiator, and is not limited to only patch the top third radiator 93 in this embodiment. The top layer third radiator 93 is coupled to the top layer first radiator 91 through the top layer fourth radiator 94, and the top layer third radiator 93 is connected to the short-circuit branch 95 through the third lumped element 10 and is connected to the top layer metal ground 1 through the short-circuit branch 95. The top third radiator 93 may be completely insulated from the metallic radiating patch 13 or may be conductively connected at appropriate locations by adding one or more conductive connection points. The first metal wall 6 is connected to the top layer metal ground 1 by means of first and second lumped elements. Wherein, the first lumped element 7, the second lumped element 8 and the third lumped element 10 may be one or a combination of capacitance, inductance, resistance, etc., and the resonant characteristics of the antenna may be further adjusted by adjusting the parameters and distribution positions of the lumped elements. A gap remains between the top fourth radiator 94 and the top metal ground 1. The top first radiator 91, the top second radiator 92, the top third radiator 93, the top fourth radiator 94, the metal radiating patch 13 and the first metal wall 6 are made of metal materials.
Based on the above-described antenna apparatus of the terminal device of the present invention, during the transmission process, the radio frequency signal on the terminal device motherboard 12 is fed into the top-layer second radiator 92 from the feeding port 11, so that the top-layer second radiator 92 excites a current, and a part of the working current enters the top-layer fourth radiator 94 and the top-layer third radiator 93 through the top-layer first radiator 91, and then enters the metal ground of the motherboard through the third lumped element 10 and the short-circuit branch 95. Another part of the current is coupled to the metal ground of the motherboard through the gap between the top first radiator 91 and the top metal ground 1, forming a current loop. Meanwhile, gaps are sealed between the top-layer third radiator 93 and the metal coupling sheet 13 as well as between the top-layer third radiator and the data card main board 12 to generate multiple coupling, so that multiple resonance points are generated, and the working frequency band of the antenna is widened.
During implementation, 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 radiating plate 13 in the structure of the antenna device, the sizes of coupling gaps between the optimized radiators, between the radiators and the data card motherboard, between the metal radiators and the data card motherboard, and between the metal radiating plates and the antenna radiators, and optimizing the parameters and distribution positions of lumped elements, the resonance and matching states of the antenna device can be adjusted, and finally the requirement of completely covering the target bandwidth is met.
Example 3
Fig. 6 is a schematic diagram of an antenna structure of a third terminal device according to an embodiment of the present invention, and as shown in fig. 6, the present embodiment is different from embodiment 1 in that: and arranging a metal coupling sheet 14 in the non-metal area 5 of the antenna bottom layer, wherein the metal coupling sheet 14 is arranged in the non-metal area in a printing or welding mode. A gap exists between the metal coupling sheet 14 and the data card main board 12, and the metal coupling sheet 14 and the data card main board 12 are coupled through the gap, so that secondary coupling between the antenna radiator and the data card main board 12 is realized.
As shown in fig. 3, the antenna topology unit 9 is laid around the top non-metal area 4 of the top metal ground 1 and the bottom non-metal area 5 of the bottom metal ground 2 of the terminal device main board 12. The top non-metal area 4 and the bottom non-metal area 5 may be any regular or irregular shape such as a square, a circle, a diamond, a trapezoid, a triangle, etc., and are not limited to the rectangle shown in fig. 2 of the embodiment, and the shapes of the top non-metal area 4 and the bottom non-metal area 5 are not necessarily identical. The feed port 11 of the antenna topology unit 9 is connected with the rf signal output port provided by the terminal device motherboard, and the ground of the feed port 11 of the antenna topology unit 9 is connected with the metal ground of the terminal device motherboard.
As shown in fig. 6, the antenna topology unit 9 includes: top layer first radiator 91, top layer second radiator 92, top layer third radiator 93, top layer fourth radiator 94, metal radiating patch 14, first lumped element 7, second lumped element 8, third lumped element 10 and first metal wall 6. The top first radiator 91, the top second radiator 92, the top third radiator 93 and the top fourth radiator 94 may be, but not limited to, square, circular, diamond, trapezoid, triangle, or any regular or irregular planar distribution, and are disposed in the non-metal region by printing or welding. In this embodiment, the top first radiator 91, the top second radiator 92 and the top fourth radiator 94 all use rectangular radiating patches, and the top third radiator 93 uses a segment of the inductance meander line shown in fig. 2. In this embodiment, the metal radiation patch 14 is printed on the bottom non-metal region 5 by using a rectangular metal coupling sheet, and is coupled with the top antenna radiator by using a non-metal medium between printing layers, and may be applied to all or part of the projection area of the top antenna radiator, and is not limited to the application of the patch to only the projection area of the top third radiator 93 in this embodiment. The top layer third radiator 93 is coupled to the top layer first radiator 91 through the top layer fourth radiator 94, and the top layer third radiator 93 is connected to the short-circuit branch 95 through the third lumped element 10 and is connected to the top layer metal ground 1 through the short-circuit branch 95. The top third radiator 93 may be completely insulated from the metallic radiating patch 14 or may be conductively connected at appropriate locations by adding one or more conductive connection points. The first metal wall 6 is connected to the top layer metal ground 1 by means of first and second lumped elements. Wherein, the first lumped element 7, the second lumped element 8 and the third lumped element 10 may be one or a combination of capacitance, inductance, resistance, etc., and the resonant characteristics of the antenna may be further adjusted by adjusting the parameters and distribution positions of the lumped elements. A gap remains between the top fourth radiator 94 and the top metal ground 1. The top first radiator 91, the top second radiator 92, the top third radiator 93, the top fourth radiator 94, the metal radiating patch 14 and the first metal wall 6 are made of metal materials.
Based on the above-described antenna apparatus of the terminal device of the present invention, during the transmission process, the radio frequency signal on the terminal device motherboard 12 is fed into the top-layer second radiator 92 from the feeding port 11, so that the top-layer second radiator 92 excites a current, and a part of the working current enters the top-layer fourth radiator 94 and the top-layer third radiator 93 through the top-layer first radiator 91, and then enters the metal ground of the motherboard through the third lumped element 10 and the short-circuit branch 95. Another part of the current is coupled to the metal ground of the motherboard through the gap between the top first radiator 91 and the top metal ground 1, forming a current loop. Meanwhile, the top third radiator 93 and the metal coupling sheet 14 and the data card main board 12 are sealed by the gap to generate multiple coupling, thereby generating multiple resonance points, widening the working frequency band of the antenna,
in implementation, 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 radiating plate 14 in the structure of the antenna device, the sizes of coupling gaps between the optimized radiators, between the radiators and the data card motherboard, between the metal radiators and the data card motherboard, and between the metal radiating plates and the antenna radiators, and optimizing the parameters and distribution positions of lumped elements, the resonance and matching states of the antenna device can be adjusted, and finally the requirement of completely covering the target bandwidth is met.
In summary, the embodiments of the present invention open a metal-free region on the data card, and the metal-free region only includes design elements such as an antenna radiator, a metal coupling sheet, and a slot. And finally, the requirement of completely covering the target frequency band is realized by optimizing the shape of the metal-free area and the design elements in the metal-free area.
The shape of the antenna radiation unit according to the embodiment of the present invention is not limited to the shape adopted in the embodiment, and the size of the radiation patches and the size of the gaps between the radiation patches are not limited to the size adopted in the embodiment of the present invention.
The shape of the metal-free area in the embodiment of the present invention may be any regular or irregular shape, and is not limited to the shape adopted in the embodiment of the present invention, and the shape of the metal-free area on the top layer of the main board and the shape of the metal-free area on the bottom layer of the main board do not need to be completely the same.
The resonant network according to the embodiment of the present invention may be formed by one of an inductor and/or a capacitor, or a combination of a plurality of inductors, capacitor strings, and/or capacitors.
The invention is not limited to the frequency band range in the embodiment of the invention, and the size of the antenna can be adjusted according to the requirement of the working frequency band so as to meet the requirement of the working frequency band.
Fig. 8 is a S11 parameter diagram when applied to a wireless terminal antenna according to an embodiment of the present invention, where the antenna device covers the required LTE frequency bands 698MHz to 960MHz and 1710MHz to 2690MHz, so as to meet the requirement of high performance of the antenna.
Fig. 9 is a radiation efficiency graph of the antenna device applied to the antenna of the wireless terminal, in which the radiation efficiency of the antenna device is greater than 60% at low frequency and greater than 60% at high frequency. It can be seen that the terminal antenna device covers the required LTE frequency band of 698 MHz-960 MHz &1710 MHz-2690 MHz, so that the terminal antenna device has the characteristic of high efficiency and meets the requirement of high performance of the antenna.
In summary, the embodiments of the present invention have the following technical effects:
1. the totally-enclosed region of the radiation region is realized through the metal surrounding edge enclosed structure, and the metal ground current is balanced;
2. the O-shaped closed loop is realized through the metal surrounding edge closed structure, and compared with the C-shaped loop, the O-shaped closed loop has the advantages of small ohmic impedance of a current path, small loss, high radiation efficiency and good ESD (electro-static discharge) resistance effect;
3. by the local resonance multi-order echo differential suppression method, broadband impedance matching under miniaturization and high reactance is realized, the antenna headroom is reduced to be small, the headroom is about 0.05 lambda multiplied by 0.025 lambda (the lowest working frequency of 698MHz) and is far less than the requirement of 1/4 wavelength, and meanwhile, the broadband of LTE698-960 and 1710-2690 is covered.
Although the present invention has been described in detail hereinabove, the present invention is not limited thereto, and various modifications can be made by those skilled in the art in light of the principle of the present invention. Thus, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.
Claims (8)
1. A method for implementing an antenna device of a terminal device is characterized by comprising the following steps:
dividing a totally-enclosed non-metal area for balancing the metal ground current on the metal ground of a main board of the terminal equipment;
arranging an antenna topological unit in the divided totally-enclosed non-metal area, wherein the antenna topological unit comprises: a first radiator, a second radiator, a third radiator, a fourth radiator and a lumped element, wherein a gap exists between the first radiator and the terminal equipment mainboard;
during the antenna topological 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 an equivalent network formed by the third radiator, the lumped element, the metal ground and the second radiator generates a reflection signal;
and carrying out differential cancellation processing on the echo signal and the reflection signal to obtain a differential signal, and absorbing the differential signal by using a first radiator so as to realize broadband impedance matching.
2. The method of claim 1, wherein the terminal device motherboard has at least two printed circuit layers, and the dividing the fully enclosed non-metallic region for balancing the metal ground current on the metal ground of the terminal device motherboard comprises:
and a totally-enclosed non-metal area is divided on the metal ground of each printed circuit layer of the main board of the terminal equipment.
3. The method of claim 2, wherein the arranging the antenna topology units within the divided totally enclosed non-metallic regions comprises:
the antenna topology unit is arranged in a totally enclosed non-metallic area of the metallic ground of at least one printed circuit layer.
4. The method according to any one of claims 1-3, further comprising:
arranging a first metal coupling sheet with a gap between the first metal coupling sheet and the terminal equipment mainboard on at least one of the first radiator and the fourth radiator, and coupling the first metal coupling sheet with the terminal equipment mainboard through the gap between the first metal coupling sheet and the terminal equipment mainboard; and/or
And arranging a second metal coupling sheet with a gap between the non-metal area without the antenna topological unit and the terminal equipment mainboard, and coupling the second metal coupling sheet with the terminal equipment mainboard through the gap between the second metal coupling sheet and the terminal equipment mainboard.
5. A terminal device antenna apparatus, comprising:
the metal ground is positioned on the terminal equipment main board and is provided with a fully-closed non-metal area for balancing the metal ground current;
the antenna topological unit is arranged in the totally-enclosed non-metal area and comprises a first radiator, a second radiator, a third radiator, a fourth radiator and a lumped element, wherein a gap exists between the antenna topological unit and the terminal equipment mainboard;
during 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, an equivalent network formed by the third radiator, the lumped element, the metal ground and the second radiator generates a reflection signal, differential cancellation processing is performed on the echo signal and the reflection signal to obtain a differential signal, and the differential signal is absorbed by the first radiator to realize broadband impedance matching.
6. The apparatus of claim 5, wherein the terminal device motherboard has at least two printed circuit layers, and each printed circuit layer has a fully enclosed non-metallic region on a metal ground.
7. The apparatus of claim 6, wherein the antenna topology elements are arranged in a fully enclosed non-metallic region of a metallic ground of at least one printed circuit layer.
8. The apparatus of any one of claims 5-7, further comprising:
the first metal coupling sheet is arranged on at least one of the first radiator, the second radiator and the terminal equipment main board, and a gap exists between the first metal coupling sheet and the terminal equipment main board, so that the first metal coupling sheet is coupled with the terminal equipment main board through the gap between the first metal coupling sheet and the terminal equipment main board; and/or
And the second metal coupling sheet is arranged in a non-metal area where the antenna topological unit is not arranged, a gap exists between the second metal coupling sheet and the terminal equipment mainboard, and the second metal coupling sheet is used for realizing secondary coupling with the terminal equipment mainboard through the gap between the second metal coupling sheet and the terminal equipment mainboard.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810502731.4A CN110534874B (en) | 2018-05-23 | 2018-05-23 | Terminal equipment antenna device and implementation method |
| EP19806600.3A EP3799206A4 (en) | 2018-05-23 | 2019-05-22 | Terminal device antenna apparatus and implementation method |
| PCT/CN2019/087992 WO2019223727A1 (en) | 2018-05-23 | 2019-05-22 | Terminal device antenna apparatus and implementation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810502731.4A CN110534874B (en) | 2018-05-23 | 2018-05-23 | Terminal equipment antenna device and implementation method |
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| CN110534874A CN110534874A (en) | 2019-12-03 |
| CN110534874B true CN110534874B (en) | 2022-02-25 |
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| CN201810502731.4A Active CN110534874B (en) | 2018-05-23 | 2018-05-23 | Terminal equipment antenna device and implementation method |
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| Country | Link |
|---|---|
| EP (1) | EP3799206A4 (en) |
| CN (1) | CN110534874B (en) |
| WO (1) | WO2019223727A1 (en) |
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| Publication number | Publication date |
|---|---|
| WO2019223727A1 (en) | 2019-11-28 |
| EP3799206A1 (en) | 2021-03-31 |
| CN110534874A (en) | 2019-12-03 |
| EP3799206A4 (en) | 2021-08-04 |
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