EP3799206A1 - Antennenvorrichtung und -verfahren - Google Patents

Antennenvorrichtung und -verfahren Download PDF

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Publication number
EP3799206A1
EP3799206A1 EP19806600.3A EP19806600A EP3799206A1 EP 3799206 A1 EP3799206 A1 EP 3799206A1 EP 19806600 A EP19806600 A EP 19806600A EP 3799206 A1 EP3799206 A1 EP 3799206A1
Authority
EP
European Patent Office
Prior art keywords
radiator
terminal device
mainboard
metal ground
metallic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19806600.3A
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English (en)
French (fr)
Other versions
EP3799206A4 (de
Inventor
Chuangzhu Zhou
Xiaoming Wang
Zibin WENG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Publication of EP3799206A1 publication Critical patent/EP3799206A1/de
Publication of EP3799206A4 publication Critical patent/EP3799206A4/de
Pending legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present disclosure relates to the field of antennas, and in particular to an antenna apparatus for a terminal device and an implementation method of the same.
  • the existing terminal devices mostly adopt antennas such as monopole antennas, planar inverted-F antennas (PIFAs) and loop antennas. These antennas are physically large in order to be compatible with coverages of frequency bands, and the bandwidth of a single type of antenna cannot meet the operation requirement of a terminal device for communication.
  • LTE long term evolution
  • the conventional antennas can operate resonantly when their size is one-half or one-quarter of the operating wavelength.
  • an antenna design method for a wireless terminal and a data card single board for a wireless terminal have been proposed.
  • the antenna design method includes steps of: dividing off, on the data card single board of the wireless terminal, a semi-closed area without other metal wirings except for an antenna wiring; and, coupling the antenna wiring to the data card single board.
  • SAR specific absorption rate
  • the existing technology has the following disadvantages.
  • the radiation area is a semi-closed area and is thus greatly affected by the environment, the electric current of the metal ground is unbalanced, the ohmic loss of the electric current path is high, and the electro-static discharge (ESD) resistance is poor.
  • the radiating antenna requires a large clearance, which is about 1/4 of the wavelength of the minimum operating frequency, and the operating frequency band is narrow.
  • Embodiments of the present disclosure provide a method for implementing an antenna apparatus for a terminal device, including steps of: dividing off, on a metal ground of a mainboard of the terminal device, a fully-closed non-metallic area configured to balance the electric current of the metal ground; arranging an antenna topology unit in the divided-off fully-closed non-metallic area; and, generating, by the antenna topology unit, an operating electric current using an RF signal provided by the mainboard of the terminal device, and coupling the operating electric current to the metal ground so as to realize wideband impedance matching by local resonance multistage echo differential suppression.
  • Embodiments of the present disclosure further provide an antenna apparatus for a terminal device, including: a metal ground, which is located on a mainboard of the terminal device and has a fully-closed non-metallic area configured to balance the electric current of the metal ground; and, an antenna topology unit, which is arranged in the fully-closed non-metallic area, generates an operating electric current using an RF signal provided by the mainboard of the terminal device, and couples the operating electric current to the metal ground so as to realize wideband impedance matching by local resonance multistage echo differential suppression.
  • a metal ground which is located on a mainboard of the terminal device and has a fully-closed non-metallic area configured to balance the electric current of the metal ground
  • an antenna topology unit which is arranged in the fully-closed non-metallic area, generates an operating electric current using an RF signal provided by the mainboard of the terminal device, and couples the operating electric current to the metal ground so as to realize wideband impedance matching by local resonance multistage echo differential suppression.
  • Fig. 1 is a flowchart of a method for implementing an antenna apparatus for a terminal device according to an embodiment of the present disclosure. As shown in Fig. 1 , the method for implementing an antenna apparatus for a terminal according to an embodiment of the present disclosure includes steps of S101 to S103.
  • a fully-closed non-metallic area configured to balance the electric current of the metal ground is divided off.
  • the mainboard of the terminal device may have at least two layers of printed circuits, and a fully-closed non-metallic area may be divided off on the metal ground of each printed circuit layer of the mainboard of the terminal device.
  • a fully-closed non-metallic area is divided off on the metal ground of the top layer of the mainboard of the terminal device, and a fully-closed non-metallic area is divided off on the metal ground of the bottom layer of the mainboard of the terminal device.
  • an inner layer at least one inner layer between the top layer and the bottom layer of the mainboard of the terminal device, a fully-closed non-metallic area is divided off on the metal ground of each inner layer.
  • an antenna topology unit is arranged in the fully-closed non-metallic area.
  • the antenna topology unit is arranged in the fully-closed non-metallic area on the metal ground of at least one printed circuit layer.
  • the antenna topology unit is arranged in at least one of the fully-closed non-metallic area on the metal ground of the top layer, the fully-closed non-metallic area on the metal ground of the bottom layer, or the fully-closed non-metallic area on the metal ground of the inner layer.
  • the antenna topology unit may include: a first radiator having a gap with the mainboard of the terminal device; a second radiator, a third radiator and a fourth radiator which are all configured to generate the operating electric current; and, a lumped element.
  • the antenna topology unit generates an operating electric current using an RF signal provided by the mainboard of the terminal device, and couples the operating electric current to the metal ground so as to realize wideband impedance matching by local resonance multistage echo differential suppression.
  • an echo signal is generated by an equivalent network formed by the second radiator, the first radiator and the fourth radiator, and a reflected signal is generated by an equivalent network formed by the third radiator, the lumped element, the metal ground and the second radiator; and, differential cancellation is performed on the echo signal and the reflected signal to obtain a differential signal, and the differential signal is absorbed by the first radiator, so as to realize wideband impedance matching.
  • the method for implementing an antenna apparatus for a terminal may further include steps of: arranging, on at least one of the first radiator, the second radiator, the third radiator and the fourth radiator, a first metallic coupling sheet having a gap with the mainboard of the terminal device, and coupling the first metallic coupling sheet to the mainboard of the terminal device through the gap between the first metallic coupling sheet and the mainboard of the terminal device; and/or, arranging, in the non-metallic area without the antenna topology unit arranged therein, a second metallic coupling sheet having a gap with the mainboard of the terminal device, and coupling the second metallic coupling sheet to the mainboard of the terminal device through the gap between the second metallic coupling sheet and the mainboard of the terminal device.
  • the radiation area is a fully-closed area and is thus less affected by the environment; and the electric current of the metal ground is a balanced electric current, good radiation characteristics can be achieved.
  • the antenna apparatus of an "0"-shaped closed loop for a terminal device implemented by an embodiment of the present disclosure has smaller ohmic impedance, lower loss, higher radiation efficiency and better ESD resistance in comparison to the electric current path of a "C"-shaped loop.
  • the clearance of the antenna is small and is about 0.05 ⁇ ⁇ 0.025 ⁇ (the minimum operating frequency is 698 MHz), which is far less than 1/4 of the wavelength, so that the operating frequency bands of LTE 698-960 MHz and 1710-2690 MHz can be satisfied.
  • An embodiment of the present disclosure also provide an antenna apparatus for a terminal device, including: a metal ground, which is located on a mainboard of the terminal device and has a fully-closed non-metallic area configured to balance the electric current of the metal ground; and, an antenna topology unit, which is arranged in the fully-closed non-metallic area, generates an operating electric current using an RF signal provided by the mainboard of the terminal device, and couples the operating electric current to the metal ground so as to realize wideband impedance matching by local resonance multistage echo differential suppression.
  • the mainboard of the terminal device may have at least two layers of printed circuits, and a fully-closed non-metallic area may be divided off on the metal ground of each printed circuit layer.
  • the metal ground specifically includes a top metal ground of the top printed circuit layer of the mainboard of the terminal device and a bottom metal ground of the bottom printed circuit layer of the mainboard of the terminal device, and both the top metal ground and the bottom metal ground have fully-closed non-metallic areas.
  • the mainboard of the terminal device has more than two printed circuit layers, that is, if there is an inner layer (at least one printed circuit layer) between the top layer and the bottom layer, the metal ground further includes an inner metal ground of each printed circuit layer of each layer.
  • the antenna topology unit is arranged in the fully-closed non-metallic area on the metal ground of at least one printed circuit layer, for example, being arranged in the fully-closed non-metallic area on the top metal ground, being arranged in the fully-closed non-metallic area on the top metal ground, or in the fully-closed non-metallic area on the inner metal ground, or the like.
  • the antenna topology unit may include: a first radiator having a gap with the mainboard of the terminal device; a second radiator, a third radiator and a fourth radiator which are all configured to generate the operating electric current; and, a lumped element.
  • an echo signal is generated by an equivalent network formed by the second radiator, the first radiator and the fourth radiator, a reflected signal is generated by an equivalent network formed by the third radiator, the lumped element, the metal ground and the second radiator, differential cancellation is performed on the echo signal and the reflected signal to obtain a differential signal, and the differential signal is absorbed by the first radiator, so as to realize wideband impedance matching.
  • the antenna apparatus for a terminal device may further include: a first metallic coupling sheet, which is arranged on at least one of the first radiator, the second radiator, the third radiator and the fourth radiator, has a gap with the mainboard of the terminal device, and realizes coupling with the mainboard of the terminal device through the gap between the first metallic coupling sheet and the mainboard of the terminal device; and/or, a second metallic coupling sheet, which is arranged in the non-metallic area without the antenna topology unit arranged therein, has a gap with the mainboard of the terminal device, and realizes secondary coupling with the mainboard of the terminal device through the gap between the second metallic coupling sheet and the mainboard of the terminal device.
  • Fig. 2 is a schematic diagram of a connection structure between an antenna apparatus and a terminal device according to an embodiment of the present disclosure
  • Fig. 3 is a structural diagram of the antenna apparatus for a terminal device according to an embodiment of the present disclosure.
  • the antenna apparatus for a terminal device is applicable to notebook computers, PCs, PADs or other terminal devices.
  • the interface between the antenna apparatus and the terminal device may be a USB interface, PCMCIA interface (PC memory card interface), an Express interface or other interfaces.
  • the antenna apparatus for a terminal device may include a mainboard 12 and a USB interface 3, and may be connected to a terminal device such as a notebook computer or a PC through the USB interface 3.
  • the mainboard 12 may be a dielectric board coated with copper on both sides.
  • the mainboard 12 includes a dielectric board made of a non-metallic material and copper layers that are coated on the top and bottom of the dielectric board.
  • a top non-metallic area 4 and a bottom non-metallic area 5 are reserved for the arrangement of the antenna topology unit 9.
  • each non-metallic area may be 11 mm ⁇ 21 mm ⁇ 2 mm in size.
  • Fig. 3 is a structural diagram of the antenna apparatus for a terminal device according to an embodiment of the present disclosure.
  • the antenna apparatus for a terminal device according to an 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 planar and located on the front surface of the mainboard 12.
  • the bottom metal ground 2 may also be planar and located on the bottom surface of the mainboard 12.
  • the material of the mainboard 12 may include a non-metallic material, and multiple layers of printed circuits may be included in the area of the metal ground of the mainboard 12.
  • the antenna apparatus for a terminal device according to an embodiment of the present disclosure may be connected to a terminal device through the USB interface 3.
  • the antenna topology unit 9 may be arranged in the top non-metallic area 4 on the top metal ground 1 and/or the bottom non-metallic area 5 on the bottom metal ground 2 of the mainboard 12.
  • the top non-metallic area 4 and the bottom non-metallic area 5 may be in any regular or irregular shape such as square, circle, rhombus, trapezoid or triangle, but not limited to rectangle shown in Figs. 2 and 3 ; and, the top non-metallic area 4 and the bottom non-metallic area 5 are not necessarily identical in shape.
  • a feed port 11 of the antenna topology unit 9 is connected to an RF signal output port provided by the mainboard 12, and the ground of the feed port 11 of the antenna topology unit 9 is connected to the metal ground of the mainboard 12.
  • Fig. 4 is a structural diagram of the antenna apparatus for a terminal device according to an embodiment of the present disclosure.
  • the antenna topology unit 9 may be arranged in the top non-metallic area 4, and may include a first radiator 91, a second radiator 92, a third radiator 93, a fourth radiator 94, a first lumped element 7, a second lumped element 8, a third lumped element 10 and a first metallic wall 6.
  • the first radiator 91, the second radiator 92, the third radiator 93 and the fourth radiator 94 may be, but not limited to, any regular or irregular shape such as square, circle, rhombus, trapezoid or triangle, and may be arranged in the top non-metallic area 4 by printing or welding.
  • the first radiator 91, the second radiator 92 and the fourth radiator 94 may be rectangular radiating patches, and the third radiator 93 may be an inductive meander line shown in Fig. 4 .
  • the third radiator 93 is coupled to the first radiator 91 through the fourth radiator 94.
  • the third radiator 93 is connected to a short-circuit branch 95 through the third lumped element 10, and connected to the top metal ground 1 through the short-circuit branch 95.
  • the first metallic wall 6 is connected to the top metal ground 1 through the first lumped element 7 and the second lumped element 8.
  • Each of the first lumped element 7, the second lumped element 8 and the third lumped element 10 may be one of or a combination of capacitors, inductors, resistors and other devices, and the resonance characteristics of the antenna can be adjusted by adjusting the parameters and distribution positions of the lumped elements.
  • the first radiator 91, the second radiator 92, the third radiator 93, the fourth radiator 94 and the first metallic wall 6 are all made of a metallic material.
  • an RF signal on the mainboard 12 is fed into the antenna topology unit 9 through the feed port 11, so that the antenna topology unit 9 excites an operating electric current.
  • the operating electric 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, and the operating electric current flows into the top metal ground 1 and the bottom metal ground 2 through the short-circuit branch 95, so as to form a complete radiation resonant circuit.
  • the RF signal on the mainboard 12 is fed into the second radiator 92 through the feed port 11, so that the second radiator 92 excites an electric current.
  • a part of the operating electric current enters the fourth radiator 94 and the third radiator 93 through the first radiator 91 and then enters the metal ground of the mainboard 12 through the third lumped element 10 and the short-circuit branch 95, while the other part of the operating electric current is coupled to the metal ground of the mainboard 12 through the gap between the first radiator 91 and the top metal ground 1, so as to form an electric current loop.
  • Fig. 7 is an equivalent circuit diagram of the antenna apparatus for a terminal device according to an embodiment of the present disclosure.
  • the second radiator 92 is equivalent to a first distributed inductor Lse;
  • the first radiator 91 is equivalent to a radiation resistor Rse;
  • the first radiator 91 and the fourth radiator 94 generate a first coupling capacitor Cse;
  • the third radiator 93 is equivalent to a second distributed inductor Lsh;
  • a second coupling capacitor Csh and a radiation admittance Gr are generated between the second radiator 92 and the top metal ground 1; and, the third lumped element 10 generates a lumped capacitor C1.
  • the local resonance state of the whole antenna apparatus can be controlled by appropriately adjusting the Lse, Cse, Lsh, Csh and C1.
  • the resonance and matching state of the antenna apparatus can be adjusted, and the requirement of fully covering the target bandwidth can be finally satisfied.
  • Fig. 5 is another structural diagram of the antenna apparatus for a terminal device according to an embodiment of the present disclosure.
  • the structure of the antenna apparatus shown in Fig. 5 for a terminal device differs from the structure of the antenna apparatus shown in Fig. 4 in that a metallic coupling sheet 13 is arranged on the third radiator 93 and is coupled to the antenna radiator by a non-metallic medium, or by air as a medium.
  • a gap between the metallic coupling sheet 13 and the mainboard 12 and the metallic coupling sheet 13 is coupled to the mainboard 12 through the gap, so that secondary coupling of the antenna radiator to the mainboard 12 is realized.
  • the antenna topology unit 9 may be arranged in the top non-metallic area 4 on the top metal ground 1 of the mainboard 12.
  • the top non-metallic area 4 may be in any regular or irregular shape such as square, circle, rhombus, trapezoid or triangle, but not limited to rectangle shown in Fig. 5 .
  • a feed port 11 of the antenna topology unit 9 is connected to a RF signal output port provided by the mainboard 12, and the ground of the feed port 11 of the antenna topology unit 9 is connected to the metal ground of the mainboard 12.
  • the antenna topology unit 9 may include a first radiator 91, a second radiator 92, a third radiator 93, a fourth radiator 94, a metallic coupling sheet 13, a first lumped element 7, a second lumped element 8, a third lumped element 10 and a first metallic wall 6.
  • the first radiator 91, the second radiator 92, the third radiator 93 and the fourth radiator 94 may be, but not limited to, any regular or irregular shape such as square, circle, rhombus, trapezoid or triangle, and may be arranged in the top non-metallic area 4 by printing or welding.
  • the first radiator 91, the second radiator 92 and the fourth radiator 94 may be rectangular radiating patches, and the third radiator 93 may be an inductive meander line shown in Fig. 5 .
  • the metallic coupling sheet 13 may be, but not limited to, any regular or irregular shape such as square, circle, rhombus, trapezoid or triangle.
  • the metallic coupling sheet 13 may be a rectangular metal sheet.
  • the metallic coupling sheet 13 may be arranged on the whole or part of the top antenna radiator, and is not limited to being arranged on the third radiator 93 as 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 a short-circuit branch 95 through the third lumped element 10 and connected to the top metal ground 1 through the short-circuit branch 95.
  • the third radiator 93 and the metallic coupling sheet 13 may be completely insulated from each other, or may be conductively connected to each other by additionally providing one or more conductive connection points at appropriate positions.
  • the first metallic wall 6 is connected to the top metal ground 1 through the first lumped element 7 and the second lumped element 8.
  • the first lumped element 7, the second lumped element 8 and the third lumped element 10 may be one of or a combination of capacitors, inductors, resistors and other devices, and the resonance characteristics of the antenna can be adjusted by adjusting the parameters and distribution positions of the lumped elements.
  • the first radiator 91, the second radiator 92, the third radiator 93, the fourth radiator 94, the metallic coupling sheet 13 and the first metallic wall 6 may be all made of a metallic material.
  • the RF signal on the mainboard 12 is fed into the second radiator 92 through the feed port 11, so that the second radiator 92 excites an electric current.
  • a part of the operating electric current enters the fourth radiator 94 and the third radiator 93 through the first radiator 91 and then enters the metal ground of the mainboard 12 through the third lumped element 10 and the short-circuit branch 95, while the other part of the operating electric current is coupled to the metal ground of the mainboard 12 through the gap between the first radiator 91 and the top metal ground 1, so as to form an electric current loop.
  • the third radiator 93 is coupled to the metallic coupling sheet 13 and the mainboard 12 for multiple times through gaps, so that multiple resonance points are generated, and the operating frequency band of the antenna is expanded.
  • the resonance and matching state of the antenna apparatus can be adjusted, and the requirement of fully covering the target bandwidth can be finally satisfied.
  • Fig. 6 is still another structural diagram of the antenna apparatus for a terminal device according to an embodiment of the present disclosure.
  • this structure of the antenna apparatus for a terminal device differs from the structure of the antenna apparatus for a terminal device shown in Fig. 4 in that: a metallic coupling sheet 14 is arranged in the bottom non-metallic area 5, and the metallic coupling sheet 14 may be arranged in the non-metallic area 5 by printing or welding.
  • the antenna topology unit 9 may be arranged in the top non-metallic area 4 on the top metal ground 1 of the mainboard 12, and the metallic coupling sheet 14 may be arranged in the bottom non-metallic area 5 on the bottom metal ground 2 of the mainboard 12.
  • the top non-metallic area 4 and the bottom non-metallic area 5 may be in any regular or irregular shape such as square, circle, rhombus, trapezoid or triangle, but not limited to rectangle shown in Fig. 6 ; and, the top non-metallic area 4 and the bottom non-metallic area 5 are not necessarily identical in shape.
  • a feed port 11 of the antenna topology unit 9 is connected to a RF signal output port provided by the mainboard 12, and the ground of the feed port 11 of the antenna topology unit 9 is connected to the metal ground of the mainboard 12.
  • the antenna topology unit 9 may include a first radiator 91, a second radiator 92, a third radiator 93, a fourth radiator 94, a metallic coupling sheet 14, a first lumped element 7, a second lumped element 8, a third lumped element 10 and a first metallic wall 6.
  • the first radiator 91, the second radiator 92, the third radiator 93 and the fourth radiator 94 may be, but not limited to, any regular or irregular shape such as square, circle, rhombus, trapezoid or triangle, and may be arranged in the top non-metallic area 4 and the bottom non-metallic area 5 by printing or welding.
  • the first radiator 91, the second radiator 92 and the fourth radiator 94 may be rectangular radiating patches, and the third radiator 93 may be an inductive meander line shown in Fig. 6 .
  • the metallic coupling sheet 14 may be, but not limited to, any regular or irregular shape such as square, circle, rhombus, trapezoid or triangle.
  • the metallic coupling sheet 14 may be a rectangular metal sheet which is printed on the bottom non-metallic area 5 and coupled to the top antenna radiator by a non-metallic medium.
  • the metallic coupling sheet 14 may be arranged in all or part of a projection area of the top antenna radiator, and is not limited to being arranged in a projection area of the third radiator 93 in the top layer as shown in Fig. 6 .
  • the third radiator 93 is coupled to the first radiator 91 through the fourth radiator 94, and the third radiator 93 is connected to a short-circuit branch 95 through the third lumped element 10 and connected to the top metal ground 1 through the short-circuit branch 95.
  • the third radiator 93 and the metallic coupling sheet 14 may be completely insulated from each other, or may be conductively connected to each other by additionally providing one or more conductive connection points at appropriate positions.
  • the first metallic wall 6 is connected to the top metal ground 1 through the first lumped element 7 and the second lumped element 8.
  • the first lumped element 7, the second lumped element 8 and the third lumped element 10 may be one of or a combination of capacitors, inductors, resistors and other devices, and the resonance characteristics of the antenna can be adjusted by adjusting the parameters and distribution positions of the lumped elements.
  • the first radiator 91, the second radiator 92, the third radiator 93, the fourth radiator 94, the metallic coupling sheet 14 and the first metallic wall 6 may be all made of a metallic material.
  • the RF signal on the mainboard 12 is fed into the second radiator 92 through the feed port 11, so that the second radiator 92 excites an electric current.
  • a part of the operating electric current enters the fourth radiator 94 and the third radiator 93 through the first radiator 91 and then enters the metal ground of the mainboard 12 through the third lumped element 10 and the short-circuit branch 95, while the other part of the operating electric current is coupled to the metal ground of the mainboard 12 through the gap between the first radiator 91 and the top metal ground 1, so as to form an electric current loop.
  • the third radiator 93 is coupled to the metallic coupling sheet 14 and the mainboard 12 for multiple times through gaps, so that multiple resonance points are generated, and the operating frequency band of the antenna is expanded.
  • the resonance and matching state of the antenna apparatus can be adjusted, and the requirement of fully covering the target bandwidth is finally satisfied.
  • the requirement of fully covering the target frequency band can be finally satisfied.
  • each antenna radiator is not limited to the shape shown in the drawings, and the size of each radiator and the size of the gap between radiators are not limited to the size shown in the drawings.
  • the shape of the non-metallic area may be any regular or irregular shape and be not limited to the shape shown in the drawings, and the shape of the non-metallic area in the top layer of the mainboard is not necessarily identical to that of the non-metallic area in the bottom layer of the mainboard.
  • the network for resonance may be composed of inductors or capacitors, or may be a combination of inductors and capacitors.
  • the antenna apparatus is not limited to operating in the frequency band range described in the embodiments of the present disclosure, and the size of the antenna may be adjusted as required to satisfy the requirements of the operating frequency band.
  • Fig. 8 is a diagram illustrating the S11 parameter when the antenna apparatus according to an embodiment of the present disclosure is applied to a terminal device.
  • the antenna apparatus covers the required LTE frequency bands 698 MHz-960 MHz and 1710 MHz-2690 MHz, and satisfies the requirements for high performance of the antenna.
  • Fig. 9 is a diagram illustrating the radiation efficiency when the antenna apparatus according to an embodiment of the present disclosure is applied to a terminal device.
  • the antenna apparatus has a radiation efficiency of more than 60% in a low frequency band and a radiation efficiency of more than 60% in a high frequency band. It can be known that, the antenna apparatus covers the required LTE frequency bands 698 MHz-960 MHz and 1710 MHz-2690 MHz, so the antenna apparatus has high efficiency and satisfies the requirements for high performance of the antenna.
  • the antenna apparatus provided in the embodiments of the present disclosure has the following technical effects.
  • a metal-border enclosing structure it is realized that the radiation area is a fully-closed area and the electric current of the metal ground is balanced.
  • an "0"-shaped closed loop is realized, which has smaller ohmic impedance, lower loss, higher radiation efficiency and better ESD resistance in comparison to the electric current path of the "C"-shaped loop.
  • the wideband impedance matching under miniaturized high reactance is realized, and the antenna clearance is reduced.
  • the clearance is about 0.05 ⁇ 0.025 ⁇ (the minimum operating frequency is 689 MHz), which is far less than 1/4 of the wavelength. Meanwhile, wide LTE frequency bands 698 MHz-960 MHz and 1710 MHz-2690 MHz are covered.

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  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
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EP19806600.3A 2018-05-23 2019-05-22 Antennenvorrichtung und -verfahren Pending EP3799206A4 (de)

Applications Claiming Priority (2)

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CN201810502731.4A CN110534874B (zh) 2018-05-23 2018-05-23 一种终端设备天线装置及实现方法
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