CN110998973A - Antenna device and mobile terminal - Google Patents
Antenna device and mobile terminal Download PDFInfo
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- CN110998973A CN110998973A CN201780093867.8A CN201780093867A CN110998973A CN 110998973 A CN110998973 A CN 110998973A CN 201780093867 A CN201780093867 A CN 201780093867A CN 110998973 A CN110998973 A CN 110998973A
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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
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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
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
Abstract
The utility model provides an antenna device includes feed branch road, first ground connection branch road and irradiator, and the irradiator includes first radiation section and second radiation section, establishes the clearance between the two, and first radiation section is kept away from the one end ground connection of second radiation section. The feed branch comprises a feed end and a first connecting end, a first capacitor is connected between the feed end and the first connecting end in series, the first connecting end is located at the intersection point of the feed branch and the second radiation section, and the distance between the first connecting end and the gap is within a preset range, so that the first radiation section forms a parasitic antenna for radiating signals of the first frequency band. The first grounding branch comprises a first grounding end and a second connecting end, the second connecting end is positioned at the intersection point of the first grounding branch and the second radiation section, a matching circuit is connected between the second connecting end and the first grounding end in series, and the current fed in from the feed end passes through the matching circuit to the first grounding end to radiate signals of a second frequency band. The application also provides a mobile terminal. The method and the device can realize the coverage of frequency ranges of different frequency bands.
Description
The present invention relates to the field of antenna technology, and in particular, to an antenna device applied to a mobile terminal.
In order to enhance the quality of the mobile terminal, metal is increasingly applied to the housing of the mobile terminal, and a mobile phone with a metal housing is favored. The design of the metal shell has great influence on the performance of the antenna inside the mobile phone, the wireless communication is used as a necessary function of the mobile phone, the antenna is a necessary component, and the performance level of the antenna also relates to the quality of the communication quality and other problems.
The frequency bands of mobile phones used in the global market range are more, for example: 699MHz to 960MHz for low frequency, 1710MHz to 2690MHz for medium and high frequency, 3400MHz to 3600MHz for ultrahigh frequency. Under the condition of the design of the all-metal rear cover, if the antenna covers more frequency bands, a switch device is usually added in the mobile terminal, the switch device is an active device, and the switch is controlled by voltage to realize that the antenna device covers more frequency bands, but the switch device is not only large in size and high in cost, but also is easy to damage, and when the switch device is damaged, the performance of the antenna is abnormal.
If an antenna device is designed, under the condition that an active device and an adjustable device are not added, the coverage of a multi-band range can be realized, and the antenna device is a research direction in the industry.
Disclosure of Invention
The embodiment of the invention provides an antenna device which can cover different frequency band ranges.
The antenna device provided by the invention comprises a feed branch, a first grounding branch and a radiator,
the radiator comprises a first radiation section and a second radiation section, a gap is formed between the first radiation section and the second radiation section, and one end, far away from the second radiation section, of the first radiation section is grounded;
the feed branch comprises a feed end and a first connection end, a first capacitor is connected between the feed end and the first connection end in series, the first connection end is located at the intersection point of the feed branch and the second radiation section, the distance between the first connection end and the gap is within a preset range, so that the current fed in by the feed end is the minimum at the gap to form coupled feed, a signal is coupled to the first radiation section, the first radiation section forms a parasitic antenna for radiating a signal of a first frequency band, and the wavelength of an electromagnetic wave signal of a resonant frequency formed on the first radiation section is as follows: 1/4 wavelengths corresponding to the first frequency band;
the first grounding branch comprises a first grounding end and a second connecting end, the second connecting end is located at the intersection point of the first grounding branch and the second radiation section, a matching circuit is connected between the second connecting end and the first grounding end in series, current fed in from the feed end passes through the matching circuit to the first grounding end so as to radiate signals of a second frequency band, and the matching circuit is used for carrying out frequency modulation on the signals of the second frequency band. The wavelength of the electromagnetic wave signal of the resonant frequency formed by the first grounding branch and the feeding branch is as follows: the second frequency band corresponds to 1/4 wavelengths. Specifically, the frequency range of the signal in the first frequency band is higher than the frequency range of the signal in the second frequency band, for example: the first frequency band is a medium-high frequency, and the second frequency band is a low frequency.
In this embodiment, the distance between the first connection end of the feeding branch and the gap is set within a preset range, so as to ensure that the current fed in by the feeding end is the minimum at the gap position, and form a coupling feed to couple the signal to the first radiation section, so that the first radiation section forms a parasitic antenna for radiating the first frequency band signal. That is to say, this application is through rationally setting up the distance between feed branch and the clearance, and the electric current of adjusting clearance position department is minimum, utilizes the magnetic coupling mode, and with the parasitic antenna mode of second radiation section coupling, increased a radiation mode for antenna device. According to the design, the basic framework of the traditional antenna is not required to be changed, an active device or an adjustable device is not required to be added, the radiation mode of the antenna device can be increased only by adjusting the position of the feed branch, and the bandwidth is expanded (in one implementation mode, the parasitic antenna can radiate medium-high frequency signals, so that the medium-high frequency bandwidth is expanded).
In one embodiment, the distance between the first connection end and the gap is less than or equal to 4mm, specifically, the distance between the first connection end and the gap may be set to be between 2 and 4mm, and the distance between the second connection end and the first connection end is 10 mm. In the embodiment, for a common mobile terminal, a smart phone is taken as an example, and through testing, when the distance between the first connection end and the gap is smaller than or equal to 4mm, the current of the feed branch at the gap is the minimum, so that better coupling can be realized, and the feed branch only needs to be connected in series with the first capacitor, so that the parasitic antenna mode for radiating the first frequency band signal can be realized.
In one embodiment, the matching circuit includes a switching element and a selection circuit connected in series between the first ground terminal and the second connection terminal, the selection circuit includes at least two parallel frequency modulation branches, and the switching element is configured to switch the at least two frequency modulation branches to adjust the bandwidth of the second frequency band. The present application does not limit the specific form of the matching circuit, and other forms of matching circuits may be used to configure signals in a certain frequency band, but in the present embodiment, the switching element is controlled according to specific requirements by matching the switching element with the selection circuit or by implementing different modes, so as to adjust the bandwidth of the second frequency band.
In one embodiment, the at least two frequency modulation branches each include an inductive element, and inductance values of the inductive elements in the frequency modulation branches are different. The frequency modulation branch circuit provided by the embodiment utilizes the inductance elements with different inductance values, and is simple in structure and easy to realize.
In one embodiment, two ends of the second radiation section are a first coupling end and a far end, respectively, two ends of the first radiation section are a second coupling end and a ground end, respectively, and the gap is formed between the second coupling end and the first coupling end. The first radiation section is arranged on one side of the first coupling end of the second radiation section, when the antenna device is applied to the mobile terminal, the first radiation section is located at one edge position of the mobile terminal, the second radiation section extends between two opposite edges of the mobile terminal, and the extending length and the extending shape of the second radiation section can be adjusted. The feeding branch is arranged close to the edge of the mobile terminal, and a parasitic antenna mode is generated through coupling at the gap.
This application does not do the injecing to the concrete shape of first radiation section and second radiation section, in an embodiment, the second radiation section is the extension of linearity, first radiation section is the extension of arc line, the design of the irradiator of this embodiment, the corner position that conveniently is close to mobile terminal with first radiation section and second radiation section sets up, the second radiation section is unanimous and is close to mobile terminal's minor face with mobile terminal's minor face extending direction, first radiation section can set up the position department that intersects at mobile terminal's long limit and mobile terminal's minor face, such position is arranged and is favorable to reducing the influence of the inside components and parts of mobile terminal to antenna device, promotion antenna device's radiation performance. In other embodiments, the second radiating section may also extend in a wave shape or an irregular shape, and the first radiating section may also extend in a straight line shape or other shapes.
In one embodiment, the antenna apparatus further includes a second grounding branch, the second grounding branch is connected in parallel with the first grounding branch, the second grounding branch is located on a side of the first grounding branch away from the feeding branch, and a current fed from the feeding end flows into the second grounding branch through the first capacitor, so as to realize radiation of a signal in a second frequency band. In this embodiment, the second grounding branch and the first grounding branch can both realize the radiation of the second frequency band signal, and the bandwidth of the second frequency band is widened. In the present embodiment, the first grounding branch and the second grounding branch are used to form the electromagnetic wave signal with the resonant frequency having the wavelength: the second frequency band corresponds to 1/4 wavelengths.
In one embodiment, the antenna apparatus further includes a third grounding branch, the third grounding branch is connected in parallel with the first and second grounding branches, and the third grounding branch is located between the first grounding branch and the second grounding branch, the third grounding branch includes a second capacitor, a current fed from the feeding terminal flows into the third grounding branch, and the second grounding branch generates a reverse current, and the reverse current flows to an intersection of the third grounding branch and the second radiation section, so as to implement a signal in a third frequency band. In the present embodiment, the wavelength of the electromagnetic wave signal with the resonant frequency formed by the combined action of the third grounding branch and the second grounding branch is: the third frequency band corresponds to half a wavelength.
In one embodiment, the inductance value of the matching circuit is adjusted to be decreased, so that the first ground terminal of the first ground branch generates a reverse current, and the reverse current flows to the second connection terminal and the first connection terminal in sequence, and the wavelength of the electromagnetic wave signal with the resonance frequency is: and the fourth frequency band corresponds to half wavelength, namely electromagnetic waves of a resonance mode of half wavelength are radiated, and the antenna device radiates signals of the fourth frequency band.
In one embodiment, the current fed from the feeding end flows into the third grounding branch, and the wavelength of the electromagnetic wave signal with the resonance frequency is formed as follows: and the antenna device covers signals of the fifth frequency band. In this embodiment, the switching element of the first grounding branch is turned off, that is, the first grounding branch is in an open circuit state, and since the signal of the fifth frequency band is an ultra-high frequency signal, the first capacitor and the second capacitor do not function in this mode.
In one embodiment, the signal of the first frequency band is an intermediate frequency signal, the signal of the second frequency band is a low frequency signal, the signal of the third frequency band is a medium-high frequency signal, the signal of the fourth frequency band is a high frequency signal, and the signal of the fifth frequency band is an ultrahigh frequency signal. Specifically, the signal of the second frequency band is 700-900 MHz; the signal of the third frequency band is 1710-1900 MHz; the signal of the first frequency band is 1900-2400 MHz; the signal of the fourth frequency band is 2500-2690 MHz; the signals in the fifth frequency band are 3400-3600 MHz.
In one embodiment, the antenna device further includes a parasitic branch, which includes a filter circuit, and the filter circuit is connected in series between the first radiation section and the ground, and is used for passing through signals of a preset frequency band. The filter circuit may be a capacitor. In the embodiment, the parasitic branch is added on one side of the first radiation section to be connected to the ground, so that the bandwidth of the antenna device is expanded.
In one embodiment, the first capacitor is an interleaved capacitor coupled by a planar broadside, and is specifically configured as follows: the feed branch is arranged on the dielectric plate, a first electrode and a second electrode are arranged on the same plane of the dielectric plate, the first electrode includes a first conductive portion and at least two second conductive portions electrically connected to each other, the second electrode includes a third conductive portion and at least two fourth conductive portions electrically connected to each other, a space for accommodating the second conductive part and the fourth conductive part is provided between the first conductive part and the third conductive part, the at least two second conductive portions extend from the first conductive portion toward the third conductive portion, the at least two fourth conductive parts extend from the third conductive part towards the first conductive part, each fourth conductive part is arranged between two adjacent second conductive parts to form a staggered interval arrangement framework, and the first electrode and the second electrode jointly form the first capacitor.
In one embodiment, the first electrode is "Ш" shaped and the second electrode is "Π" shaped.
In a second aspect, the present application provides a mobile terminal, including metal casing and antenna device, metal casing is equipped with the antenna crack, antenna device passes through the antenna crack radiates signal.
In one embodiment, the radiator of the antenna device is a part of the metal housing, or the radiator of the antenna device is disposed inside the metal housing. When the antenna device is arranged inside the metal shell, the antenna device can be arranged on the FPC, is attached to the inner surface of the metal shell or a support in the mobile terminal, can also be formed on the inner surface of the metal shell in an in-mold injection molding mode, and radiates signals through the antenna break joint arranged on the metal shell.
In one embodiment, metal casing includes the long limit and the minor face of adjacent setting, the extending direction of antenna fault joint with the extending direction of minor face is unanimous, metal casing still is equipped with the micro-crack, the micro-crack is close to long limit, just the one end intercommunication of micro-crack the antenna fault joint, the micro-crack with form between the long limit first radiation section, the antenna fault joint with form between the minor face the second radiation section. In the embodiment, a first radiation section is formed on one part of the metal shell and a second radiation section is formed on the other part of the metal shell in a mode of arranging the antenna broken seam and the micro seam on the metal shell, and the metal shell is used as an antenna radiator, so that the antenna radiator does not need to be additionally arranged in the mobile terminal.
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.
Fig. 1 is a schematic diagram of an antenna device according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a plurality of resonance modes of an antenna device according to an embodiment of the present application, where the current flow direction includes two modes of a first frequency band and a second frequency band, and the current flow direction is expressed by a straight line with an arrow.
Fig. 3 is a schematic diagram of a plurality of resonance modes of an antenna device according to an embodiment of the present application, where the current flow directions include two modes, i.e., a first frequency band and a third frequency band, and the current flow direction is expressed by a straight line with an arrow.
Fig. 4 is a schematic diagram of a plurality of resonance modes of an antenna device according to an embodiment of the present application, where the current flow direction includes two modes of a first frequency band and a fourth frequency band, and a straight line with an arrow indicates the current flow direction.
Fig. 5 is a schematic diagram of a plurality of resonance modes of an antenna device according to an embodiment of the present application, where the current flow directions include two modes of a first frequency band and a fifth frequency band, and the current flow direction is expressed by a straight line with an arrow.
Fig. 6 is a schematic diagram of a first capacitor of a middle feeding branch of an antenna device according to an embodiment of the present application.
Fig. 7 is a partial schematic diagram of a mobile terminal according to an embodiment of the present application.
The embodiments of the present invention will be described below with reference to the drawings.
Referring to fig. 1, F in fig. 1 represents a feeding point, and G represents a grounding point. The antenna device according to the embodiment of the present invention includes a feeding branch 10, a first ground branch 20, and a radiator 30.
The radiator 30 includes a first radiation section 31 and a second radiation section 32, a gap 33 is provided between the first radiation section 31 and the second radiation section 32, and one end of the first radiation section 31, which is far away from the second radiation section 32, is grounded.
In one embodiment, two ends of the second radiation section 32 are a first coupling end 321 and a distal end 322, two ends of the first radiation section 31 are a second coupling end 311 and a ground end 312, and the gap 33 is formed between the second coupling end 311 and the first coupling end 321. The first radiating section 31 is disposed at one side of the first coupling end 321 of the second radiating section 32. This application does not do the injecing to the concrete shape of first radiation section 31 and second radiation section 32, in an embodiment, second radiation section 32 is the extension of rectilinearly, first radiation section 31 is the extension of arc line form, and the design of the irradiator 30 of this embodiment, the corner position that conveniently is close to mobile terminal with first radiation section 31 and second radiation section 32 sets up, and second radiation section 32 is unanimous and is close to the minor face with mobile terminal's minor face extending direction, and first radiation section 31 can set up the position department at mobile terminal's long limit and minor face intersection, and such position is arranged and is favorable to reducing the influence of the inside components and parts of mobile terminal to antenna device, promotes antenna device's radiation performance. In other embodiments, the second radiating section 32 may also extend in a wave shape or an irregular shape, and the first radiating section 31 may also extend in a straight line shape or other shapes.
The feeding branch 10 includes a feeding end 11 and a first connection end 12. A first capacitor 13 is connected in series between the feeding terminal 11 and the first connection terminal 12, and in one embodiment, the value of the first capacitor 13 is 1 pF. The first connection end 12 is located at an intersection point of the feeding branch 10 and the second radiation section 32, a distance between the first connection end 12 and the gap 33 is within a preset range, so that a current fed by the feeding end 11 is the smallest at the gap 33, a coupling feed is formed, a signal is coupled to the first radiation section 31, the first radiation section 31 forms a parasitic antenna that radiates a signal in a first frequency band, and a wavelength of an electromagnetic wave signal of a resonance frequency formed on the first radiation section 31 is: the first band corresponds to 1/4 wavelengths.
As shown in fig. 2, the current flows from the feeding terminal 11 to the first connection terminal 12, and then flows to the gap 33 along the second radiation section 32 to the left, where the current is the smallest and the electric field is the largest, so as to form magnetic coupling, couple to the first radiation section 31, and make the current of the first radiation section 31 flow from the ground terminal 312 to the second coupling terminal 311, where the first radiation section 31 shown in fig. 2 is arc-shaped, and the direction indicated by the straight line with an arrow in fig. 2 is the direction of the current.
When the antenna device is applied in a mobile terminal, the first radiating section 31 is located at one edge (for example, one short side) of the mobile terminal, the second radiating section 32 extends between two opposite edges (for example, two long sides) of the mobile terminal, and the length and shape of the extension of the second radiating section 32 can be adjusted, in this application, the feeding branch 10 is disposed close to the edge of the mobile terminal, and a parasitic antenna mode is generated through coupling at the gap 33.
The first grounding branch 20 includes a first grounding end 21 and a second connecting end 22, the second connecting end 22 is located at an intersection point of the first grounding branch 20 and the second radiating section 32, a matching circuit 23 is connected in series between the second connecting end 22 and the first grounding end 21, a current fed in from the feeding end 11 passes through the matching circuit 23 to the first grounding end 21, and radiates a signal of a second frequency band, and the matching circuit 23 is configured to perform frequency modulation on the signal of the second frequency band. In the loop formed by the first grounding branch 20 and the feeding branch 10, the wavelength of the electromagnetic wave signal with the resonance frequency is: the second frequency band corresponds to 1/4 wavelengths.
Referring to fig. 2, the current flows from the feeding terminal 11 to the first connection terminal 12, then flows to the second connection terminal 22 of the first ground branch 20 along the second radiation section 32, and then flows from the second connection terminal 22 to the first ground terminal 21 through the matching circuit 23, so that the wavelength of the electromagnetic wave signal with the resonant frequency is: the second frequency band corresponds to 1/4 wavelengths.
Specifically, the frequency range of the signal in the first frequency band is higher than the frequency range of the signal in the second frequency band, for example, the first frequency band is a medium-high frequency, and the second frequency band is a low frequency.
In the present embodiment, by setting the distance between the first connection end 12 of the feeding branch 10 and the gap 33 within a preset range, in order to ensure that the current fed by the feeding end 11 is the minimum at the position of the gap 33, a coupling feed is formed to couple the signal to the first radiation section 31, so that the first radiation section 31 forms a parasitic antenna that radiates the first frequency band signal. That is to say, the present application adjusts the current at the position of the gap 33 to be minimum by reasonably setting the distance between the feeding branch 10 and the gap 33, and couples the second radiation section 32 to be a parasitic antenna mode by using a magnetic coupling manner, thereby adding a radiation mode to the antenna device. According to the design, the basic framework of the traditional antenna is not required to be changed, active devices or adjustable devices are not required to be added, only the feed branch 10 is required to be arranged close to the gap 33, namely the distance between the feed branch 10 and the gap 33 is set within a preset range, the radiation mode of the antenna device can be increased, and the bandwidth is expanded (the parasitic antenna can radiate medium-high frequency signals, so that the medium-high frequency bandwidth is expanded).
In one embodiment, the distance between the first connection end 12 and the gap 33 is less than or equal to 4mm, specifically, the distance between the first connection end 12 and the gap 33 may be set to be 2-4mm, and the distance between the second connection end 22 and the first connection end 12 is 10 mm. Of course, the distance between the second connection end 22 and the first connection end 12 is not limited to 10mm, and the distance between the two can be adjusted by adjusting or changing the electrical length, so as to change the transceiving performance of the antenna. In the embodiment, for a commonly-used mobile terminal, taking a smart phone as an example, through testing, when the distance between the first connection end 12 and the gap 33 is found to be less than or equal to 4mm, the current of the feeding branch 10 at the gap 33 is the minimum (specifically, in this case, the current at the gap 33 may be zero), so that better coupling can be achieved, and the feeding branch 10 only needs to be connected in series with the first capacitor 13, so that the parasitic antenna mode for radiating the first frequency band signal can be achieved.
In one embodiment, the matching circuit 23 includes a switching element 231 and a selecting circuit 232 connected in series between the first ground terminal 21 and the second connection terminal 22, and the selecting circuit 232 includes at least two frequency modulation branches 2322 connected in parallel, and the switching element is configured to switch the at least two frequency modulation branches 2322 to adjust the bandwidth of the second frequency band. The application does not limit the specific form of the matching circuit 23, and other forms of matching circuits may be used to configure signals in a certain frequency band, but in this embodiment, the switching element 231 is controlled to communicate with different frequency modulation branches 2322 according to specific requirements by matching the switching element 231 with the selection circuit 232 or by implementing different modes, so as to adjust the bandwidth of the second frequency band.
In one embodiment, the at least two frequency modulation branches 2322 each include an inductance element, and inductance values of the inductance elements in the frequency modulation branches 2322 are different. The frequency modulation branch 2322 provided by the embodiment utilizes inductance elements with different inductance values, and is simple in structure and easy to implement.
In one embodiment, the antenna apparatus further includes a second grounding branch 40, the second grounding branch 40 is connected in parallel with the first grounding branch 20, the second grounding branch 40 is located on a side of the first grounding branch 20 away from the feeding branch 10, and a current fed from the feeding terminal 11 flows into the second grounding branch 40 through the first capacitor 13, so as to implement radiation of a signal in a second frequency band. In this embodiment, through the arrangement of the second grounding branch 40, the second grounding branch 40 and the first grounding branch 20 can both realize the radiation of the second frequency band signal, and the bandwidth of the second frequency band is widened. The present embodiment utilizes both the first ground branch 20 and the second ground branch 40 to radiate 1/4 wavelength electromagnetic waves in the resonant mode. In one embodiment, the second grounding branch 40 is disposed near the distal end 322 of the second radiating section 32, and the second grounding branch 40 is directly grounded through a wire without any capacitance, inductance, or other tuning element.
Referring to fig. 2, the current flows from the feeding terminal 11 to the first connection terminal 12, then flows to the second grounding branch 40 along the second radiation section 32, and then flows to the ground through the second grounding branch 40, so that the current can flow through the first grounding branch 20 and the second grounding branch 40 on the second radiation section 32 at the same time, thereby achieving radiation of the signal in the second frequency band, and expanding the bandwidth of the second frequency band.
In one embodiment, the antenna apparatus further includes a third grounding branch 50, the third grounding branch 50 is connected in parallel with the first grounding branch 20 and the second grounding branch 40, the third grounding branch 50 is located between the first grounding branch 20 and the second grounding branch 40, the third grounding branch 50 includes a second capacitor 52, and in one embodiment, the second capacitor 52 has a value of 0.6 pF. The current fed from the feeding terminal 11 flows into the third grounding branch 50, and the second grounding branch 40 generates a reverse current, and the reverse current flows to the intersection of the third grounding branch 50 and the second radiating section 32, so as to implement a signal in a third frequency band. In the present embodiment, the wavelengths of the electromagnetic wave signals with the resonant frequency formed by the combined action of the third grounding branch 50 and the second grounding branch 40 are: the third frequency band corresponds to half a wavelength.
Referring to fig. 3, the current feeding terminal 11 flows to the first connection terminal 12, then flows to the third grounding branch 50 along the second radiation section 32 to the right, a reverse current is generated at the intersection of the third grounding branch 50 and the second radiation section 32, the reverse current flows from the ground terminal of the second grounding branch 40 to the second radiation section 32, then flows to the intersection of the third grounding branch 50 and the second radiation section along the second radiation section 32, the current enters the third grounding branch 50 and passes through the second capacitor 52, and then goes down, so that the wavelength of the electromagnetic wave signal with the resonant frequency is: the third frequency band corresponds to half a wavelength.
In one embodiment, the distance between the second connection end 22 and the first connection end 12 is 10 mm.
In one embodiment, the inductance value of the matching circuit 23 is reduced by adjusting the inductance value, so that the first ground terminal 21 of the first ground branch 20 generates a reverse current, the reverse current flows to the second connection terminal 22 and the first connection terminal 12 in sequence, when a half-wavelength signal is generated, an electromagnetic wave signal with a resonant frequency is a half-wavelength resonant mode corresponding to a fourth frequency band, and the antenna device radiates the signal in the fourth frequency band.
Referring to fig. 4, the current feeding terminal 11 flows to the first connection terminal 12, the first grounding terminal 21 of the first grounding branch 20 generates a reverse current, the reverse current flows to the second connection terminal 22, and then flows to the first connection terminal 12 along the second radiation section 32, the antenna device in this mode radiates a signal in the fourth frequency band, and the wavelength of the electromagnetic wave signal with the resonant frequency is half the wavelength.
In one embodiment, when the current fed from the feeding terminal 11 flows into the third grounding branch 50 and generates a signal with one wavelength, the wavelength of the electromagnetic wave signal with the resonance frequency is: and the antenna device covers signals of the fifth frequency band.
Referring to fig. 5, the current feeding terminal 11 flows to the first connection terminal 12, flows to the third grounding branch 50 along the second radiation section 32, and then passes through the third grounding branch 50 to go down to the ground, so as to generate two reverse currents on the second radiation section 32, thereby generating a resonant mode of electromagnetic waves with one wavelength, and covering signals in the first frequency band, in this mode, the switching element 231 of the first grounding branch 20 is turned off, that is, the first grounding branch 20 is in an open circuit state, and since the signal in the fifth frequency band is an ultra-high frequency signal, the first capacitor 13 and the second capacitor 52 do not work in this mode.
In one embodiment, the signal of the first frequency band is an intermediate frequency signal, the signal of the second frequency band is a low frequency signal, the signal of the third frequency band is a medium-high frequency signal, the signal of the fourth frequency band is a high frequency signal, and the signal of the fifth frequency band is an ultrahigh frequency signal. Specifically, the signal of the second frequency band is 700-900 MHz; the signal of the third frequency band is 1710-1900 MHz; the signal of the first frequency band is 1900-2400 MHz; the signal of the fourth frequency band is 2500-2690 MHz; the signals in the fifth frequency band are 3400-3600 MHz.
In one embodiment, the antenna device further includes a parasitic branch 60, and the parasitic branch 60 includes a filter circuit 62, and the filter circuit 62 is connected in series between the first radiation section 31 and the ground for passing signals of a predetermined frequency band. The filter circuit 62 may be a capacitor. In the present embodiment, the parasitic branch 60 is added on one side of the first radiating section 31 to be connected to the ground, so as to expand the bandwidth of the antenna apparatus. Specifically, the parasitic branch 60 is located between the first radiating section 31 and the feeding branch 10.
As shown in fig. 2, in the parasitic branch 60, the current flows from the parasitic branch to the first radiating section 31, and then flows to the gap 33 along the first radiating section 31. One more parasitic branch is an electromagnetic wave radiation mode, so that the effect of increasing the radiation mode of the antenna device is achieved, and the bandwidth is expanded.
In one embodiment, the first capacitor 13 is an interleaved capacitor coupled by a planar broadside, and is specifically configured as follows: referring to fig. 6, the feeding branch 10 is disposed on a dielectric substrate, a first electrode 131 and a second electrode 132 are disposed on a same plane of the dielectric substrate, the first electrode 131 includes a first conductive portion 133 and at least two second conductive portions 134 electrically connected to each other, the second electrode 132 includes a third conductive portion 135 and at least two fourth conductive portions 136 electrically connected to each other, a space for accommodating the second conductive portion 134 and the fourth conductive portions 136 is disposed between the first conductive portion 133 and the third conductive portion 135, the at least two second conductive portions 134 extend from the first conductive portion 133 toward the third conductive portion 135, the at least two fourth conductive portions 136 extend from the third conductive portion 135 toward the first conductive portion 133, each fourth conductive portion 136 is disposed between two adjacent second conductive portions 134, so as to form a staggered arrangement structure, the first electrode 131 and the second electrode 132 together constitute the first capacitor 13.
In one embodiment, the first electrode is "Ш" shaped and the second electrode is "Π" shaped.
Referring to fig. 7, the antenna device provided in the present application is applied to a mobile terminal, which may be a smart phone, and the mobile terminal includes a metal housing 100, where the metal housing 100 is provided with an antenna seam 101, and the antenna device radiates a signal through the antenna seam 101. In one embodiment, the radiator 30 of the antenna device is a part of the metal housing 100, or the radiator 30 of the antenna device is disposed inside the metal housing 100. When the antenna device is disposed inside the metal casing 100, the antenna device may be disposed on the FPC, attached to the inner surface of the metal casing 100 or a support inside the mobile terminal, or formed on the inner surface of the metal casing 100 by means of in-mold injection, and radiates a signal through the antenna gap 101 disposed on the metal casing 100.
In one embodiment, the metal shell 100 includes a long side 102 and a short side 103 which are adjacently disposed, an extending direction of the antenna seam 101 is consistent with an extending direction of the short side 103, the metal shell 100 is further provided with a micro-slit 104, the micro-slit 104 is adjacent to the long side 102, one end of the micro-slit 104 is communicated with the antenna seam 101, the first radiation section 31 is formed between the micro-slit 104 and the long side 102, and the second radiation section 32 is formed between the antenna seam 101 and the short side. In the present embodiment, the first radiation section 31 is formed at one portion of the metal case 100 and the second radiation section 32 is formed at the other portion of the metal case 100 by providing the antenna slot 101 and the micro slot 104 on the metal case 100, and the metal case is used as the antenna radiator 30, so that it is not necessary to separately provide the antenna radiator 30 in the mobile terminal.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (18)
- An antenna device, comprising a feeding branch, a first grounding branch and a radiator,the radiator comprises a first radiation section and a second radiation section, a gap is formed between the first radiation section and the second radiation section, and one end, far away from the second radiation section, of the first radiation section is grounded;the feed branch comprises a feed end and a first connecting end, a first capacitor is connected between the feed end and the first connecting end in series, the first connecting end is positioned at the intersection point of the feed branch and the second radiation section, and the distance between the first connecting end and the gap is within a preset range, so that the current fed in by the feed end is minimum at the gap, a coupling feed is formed, a signal is coupled to the first radiation section, and the first radiation section forms a parasitic antenna for radiating the signal of the first frequency band;the first grounding branch comprises a first grounding end and a second connecting end, the second connecting end is located at the intersection point of the first grounding branch and the second radiation section, a matching circuit is connected between the second connecting end and the first grounding end in series, current fed in from the feed end passes through the matching circuit to the first grounding end, signals of a second frequency band are radiated, and the matching circuit is used for carrying out frequency modulation on the signals of the second frequency band.
- The antenna device according to claim 1, wherein a distance between the first connection end and the gap is equal to or less than 4 mm.
- The antenna device according to claim 1, wherein the matching circuit comprises a switching element and a selection circuit connected in series between the first ground terminal and the second connection terminal, the selection circuit comprising at least two parallel frequency modulation branches, the switching element being configured to switch the at least two frequency modulation branches to adjust the bandwidth of the second frequency band.
- The antenna arrangement according to claim 3, wherein the at least two tuning branches each comprise an inductive element, and the inductive elements in the tuning branches differ in their inductance value.
- The antenna device according to any one of claims 1 to 4, wherein two ends of the second radiating section are a first coupling end and a distal end, respectively, two ends of the first radiating section are a second coupling end and a ground end, respectively, and the second coupling end and the first coupling end form the gap therebetween.
- The antenna device according to claim 5, wherein the second radiating section extends linearly, and the first radiating end extends in an arc-line shape.
- The antenna device according to any one of claims 1 to 6, further comprising a second grounding branch, wherein the second grounding branch is connected in parallel with the first grounding branch, and the second grounding branch is located on a side of the first grounding branch away from the feeding branch, and a current fed from the feeding end flows into the second grounding branch through the first capacitor, so as to realize radiation of a signal in a second frequency band.
- The antenna device according to claim 7, further comprising a third grounding branch, wherein the third grounding branch is connected in parallel with the first and second grounding branches, and the third grounding branch is located between the first grounding branch and the second grounding branch, the third grounding branch includes a second capacitor, the current fed from the feeding terminal flows into the third grounding branch, and the second grounding branch generates a reverse current, and the reverse current flows to an intersection of the third grounding branch and the second radiating section, so as to realize a signal in a third frequency band.
- The antenna device according to claim 1, wherein the inductance value is decreased by adjusting the inductance value of the matching circuit, so that the first ground terminal of the first ground branch generates a reverse current, the reverse current flows to the second connection terminal and the first connection terminal in sequence, a wavelength of an electromagnetic wave signal having a resonance frequency is a half wavelength corresponding to a fourth frequency band, and the antenna device radiates a signal in the fourth frequency band.
- The antenna device according to claim 9, wherein the current fed from the feeding terminal flows into the third grounding branch, and the wavelength of the electromagnetic wave signal with the resonance frequency is one wavelength corresponding to the fifth frequency band, and the antenna device covers the signal with the fifth frequency band.
- The antenna device according to claim 10, wherein the signal of the first band is an intermediate frequency signal, the signal of the second band is a low frequency signal, the signal of the third band is a medium-high frequency signal, the signal of the fourth band is a high frequency signal, and the signal of the fifth band is an ultra high frequency signal.
- The antenna device according to any of claims 1 to 11, further comprising a parasitic branch including a filter circuit connected in series between the first radiating section and ground for passing signals of a predetermined frequency band.
- The antenna device of claim 12, wherein the filter circuit is a capacitor.
- The antenna device according to any one of claims 1 to 13, wherein the feeding branch is provided on a dielectric substrate, a first electrode and a second electrode are provided on a same plane of the dielectric substrate, the first electrode includes a first conductive portion and at least two second conductive portions electrically connected to each other, the second electrode includes a third conductive portion and at least two fourth conductive portions electrically connected to each other, a space for accommodating the second conductive portion and the fourth conductive portions is provided between the first conductive portion and the third conductive portion, the at least two second conductive portions extend from the first conductive portion toward the third conductive portion, the at least two fourth conductive portions extend from the third conductive portion toward the first conductive portion, each of the fourth conductive portions is provided between two adjacent second conductive portions, and an interleaved arrangement structure is formed, the first electrode and the second electrode jointly form the first capacitor.
- The antenna device of claim 14, wherein said first electrode is "Ш" shaped and said second electrode is "Π" shaped.
- A mobile terminal, characterized in that it comprises a metal casing provided with an antenna slot and an antenna device according to any one of claims 1 to 15, said antenna device radiating a signal through said antenna slot.
- The mobile terminal of claim 16, wherein the radiator of the antenna device is a portion of the metal housing or the radiator of the antenna device is disposed inside the metal housing.
- The mobile terminal of claim 16, wherein the metal shell comprises a long side and a short side which are adjacently arranged, an extending direction of the antenna crack is consistent with an extending direction of the short side, the metal shell is further provided with a micro-slit, the micro-slit is adjacent to the long side, one end of the micro-slit is communicated with the antenna crack, the micro-slit and the long side form the first radiation section, and the antenna crack and the short side form the second radiation section.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2017109314972 | 2017-10-09 | ||
| CN201710931497 | 2017-10-09 | ||
| PCT/CN2017/119558 WO2019071848A1 (en) | 2017-10-09 | 2017-12-28 | Antenna device and mobile terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110998973A true CN110998973A (en) | 2020-04-10 |
| CN110998973B CN110998973B (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201780093867.8A Active CN110998973B (en) | 2017-10-09 | 2017-12-28 | Antenna device and mobile terminal |
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| Country | Link |
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| CN (1) | CN110998973B (en) |
| WO (1) | WO2019071848A1 (en) |
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Also Published As
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| WO2019071848A1 (en) | 2019-04-18 |
| CN110998973B (en) | 2022-03-08 |
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