CN106953176B - Antenna and mobile terminal - Google Patents
Antenna and mobile terminal Download PDFInfo
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- CN106953176B CN106953176B CN201710184632.1A CN201710184632A CN106953176B CN 106953176 B CN106953176 B CN 106953176B CN 201710184632 A CN201710184632 A CN 201710184632A CN 106953176 B CN106953176 B CN 106953176B
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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
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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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
- H01Q5/335—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 at the feed, e.g. for impedance matching
Abstract
An embodiment of the present invention provides an antenna, including: a metal housing and at least one feed, the antenna further comprising: the low-frequency matching circuit, the high-frequency matching circuit, the low-frequency feed point and the high-frequency feed point; a gap is arranged on the metal shell, the gap divides the metal shell into an antenna radiation arm and a main reference ground, a fracture is formed in one side edge of the metal shell, and the gap is communicated with the fracture; one end of the low-frequency matching circuit is connected with the other end of the feed source, the other end of the low-frequency matching circuit is connected with the low-frequency feed point, and the low-frequency feed point is positioned in the gap or at the antenna radiation arm; one end of the high-frequency matching circuit is connected with the other end of the feed source, the other end of the high-frequency matching circuit is connected with the high-frequency feed point, and the high-frequency feed point is located at the antenna radiation arm. By separating the low-frequency matching circuit and the high-frequency matching circuit of the antenna, the antenna performance in a good wide frequency band can be realized, and the bandwidth and the efficiency are good.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to an antenna and a mobile terminal.
Background
The existing metal body wide-band antenna of the mobile terminal comprises a slot and a feed source. The low-frequency radiation mode and the high-frequency radiation mode are switched by switching the effective length of the slot (namely the path length of the antenna radiator), so that the adjustable range of the matching circuit in the prior art is limited, the matching mode is limited by different radiation modes, and therefore the matching circuit is required to be shared by different radiation modes, so that the bandwidth and the efficiency of the antenna are poor.
Disclosure of Invention
The embodiment of the invention provides an antenna, which aims to solve the problem that the bandwidth and the efficiency of the antenna are poor due to the fact that different radiation modes of the antenna in the prior art share a matching circuit.
The embodiment of the invention also provides a mobile terminal, which aims to solve the problem that the bandwidth and the efficiency of an antenna are poor due to the fact that different radiation modes of the antenna of the mobile terminal in the prior art share the matching circuit.
In a first aspect, an antenna is provided, including: a metal housing and at least one feed, the antenna further comprising: the low-frequency matching circuit, the high-frequency matching circuit, the low-frequency feed point and the high-frequency feed point; a gap is arranged on the metal shell, the gap divides the metal shell into an antenna radiation arm and a main reference ground, a fracture is formed in one side edge of the metal shell, and the gap is communicated with the fracture; one end of the feed source is grounded; one end of the low-frequency matching circuit is connected with the other end of the feed source, the other end of the low-frequency matching circuit is connected with the low-frequency feed point, and the low-frequency feed point is positioned in the gap or at the antenna radiation arm; one end of the high-frequency matching circuit is connected with the other end of the feed source, the other end of the high-frequency matching circuit is connected with the high-frequency feed point, and the high-frequency feed point is located at the antenna radiation arm.
In a second aspect, a mobile terminal is provided, including: the antenna is described above.
Therefore, in the embodiment of the invention, the low-frequency matching circuit and the high-frequency matching circuit of the antenna are separated and independent from each other, the low-frequency radiation mode is realized through the low-frequency matching circuit, the high-frequency radiation mode is realized through the high-frequency matching circuit, the low-frequency matching circuit and the high-frequency matching circuit are prevented from being shared, the antenna performance in a good wide frequency band can be realized, and the bandwidth and the efficiency are good.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an antenna according to a first embodiment of the present invention;
fig. 2 is a circuit diagram of a high-frequency matching circuit of the antenna of the first embodiment of the present invention;
fig. 3 is another structural diagram of the antenna of the first embodiment of the present invention;
fig. 4 is an equivalent structure diagram of the antenna according to the first embodiment of the present invention, in which the low frequency matching circuit is electrically connected;
fig. 5 is an equivalent structure diagram of the antenna according to the first embodiment of the present invention, wherein the high frequency matching circuit is electrically connected;
fig. 6 is a schematic structural diagram of an antenna according to a second embodiment of the present invention;
fig. 7 is a circuit diagram of a high-frequency matching circuit of an antenna of a second embodiment of the present invention;
fig. 8 is another structural schematic diagram of the antenna of the second embodiment of the present invention;
fig. 9 is a schematic structural diagram of an antenna according to a third embodiment of the present invention;
fig. 10 is another structural schematic diagram of an antenna of a third embodiment of the present invention;
fig. 11 is an equivalent structure diagram of the antenna according to the third embodiment of the present invention, in which the low frequency matching circuit is electrically connected;
fig. 12 is an equivalent structure diagram of the antenna according to the third embodiment of the present invention, in which the high frequency matching circuit is electrically connected;
fig. 13 is a schematic structural diagram of an antenna according to a fourth embodiment of the present invention;
fig. 14 is another structural diagram of the antenna according to the fourth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an antenna. The antenna includes: the feed source comprises a metal shell, at least one feed source, a low-frequency matching circuit, a high-frequency matching circuit, a low-frequency feed point and a high-frequency feed point. Wherein, the metal shell is provided with a gap. The slot divides the metal housing into an antenna radiating arm and a main reference ground. One side of the metal shell is provided with a fracture, and the gap is communicated with the fracture. One end of the low-frequency matching circuit is connected with the other end of the feed source, and the other end of the low-frequency matching circuit is connected with the low-frequency feed point. The low frequency feed point is located in the slot or at the antenna radiating arm. One end of the high-frequency matching circuit is connected with the other end of the feed source, the other end of the high-frequency matching circuit is connected with a high-frequency feed point, and the high-frequency feed point is located at the antenna radiation arm.
When the antenna works, the low-frequency radiation mode is realized by electrically conducting one end of the low-frequency matching circuit of the antenna with the other end of the feed source, and the high-frequency radiation mode is realized by electrically conducting one end of the high-frequency matching circuit with the other end of the feed source. It should be understood that one end of the low-frequency matching circuit and the other end of the feed source can be electrically conducted at the same time; or when one end of the low-frequency matching circuit is electrically conducted with the other end of the feed source, one end of the high-frequency matching circuit is electrically disconnected with the other end of the feed source, and vice versa.
The low-frequency matching circuit and the high-frequency matching circuit of the antenna are separated and independent from each other, the low-frequency radiation mode is realized through the low-frequency matching circuit, the high-frequency radiation mode is realized through the high-frequency matching circuit, the low-frequency matching circuit and the high-frequency matching circuit are prevented from being shared, the antenna performance in a wide frequency band can be realized, and the bandwidth and the efficiency are good.
There are many implementations of the antenna of the present invention. The antenna of the present invention is further described below with reference to specific embodiments.
First embodiment
The first embodiment of the invention discloses an antenna. As shown in fig. 1, the antenna includes: a metal casing 101, a feed 102, a low frequency matching circuit 103, a high frequency matching circuit 104, a low frequency feed 105, a high frequency feed 106, an antenna switch 107 and a coupling piece 108.
The metal case 101 is provided with a slit 109. Slot 109 divides the metal housing into antenna radiating arm 110 and main reference ground 111. One side of the metal shell 101 has a break, and the gap 109 communicates with the break. Coupling tab 108 is disposed in slot 109. Coupling tab 108 is typically a long strip of sheet metal. It should be understood that the shape of the coupling tab 108 is not limited thereto, and may be irregular sheet metal. The coupling tab 108 may be flush with the slot 109 in the height direction or have a certain height difference. One end of feed 102 is grounded. An input of the antenna switch 107 is connected to the other end of the feed 102. A first output terminal of the antenna switch 107 is connected to one terminal of the low frequency matching circuit 103. A second output terminal of the antenna switch 107 is connected to one terminal of the high-frequency matching circuit 104. Specifically, the antenna switch 107 may be a single-pole double-throw switch or a combiner. When the antenna switch 107 is a single-pole double-throw switch, when the first output terminal of the antenna switch 107 is electrically connected with the input terminal of the antenna switch 107, the second output terminal of the antenna switch 107 is electrically disconnected with the input terminal of the antenna switch 107; when the second output terminal of the antenna switch 107 is electrically connected to the input terminal of the antenna switch 107, the first output terminal of the antenna switch 107 is electrically disconnected from the input terminal of the antenna switch 107. When the antenna switch 107 is a combiner, the first output terminal and the second output terminal of the antenna switch 107 can be electrically connected to the input terminal of the antenna switch 107 at the same time. The other end of the low frequency matching circuit 103 is connected to a coupling tab 108. It should be understood that the connection point of the other end of the low frequency matching circuit 103 and the coupling tab 108 is the low frequency feed point 105. The other end of the high frequency matching circuit 104 is connected to the antenna radiation arm 110. It should be understood that the connection point of the other end of the high frequency matching circuit 104 to the antenna radiating arm 110 is the high frequency feed point 106. Preferably, the low frequency feed 105 and the high frequency feed 106 are both close to the break. More preferably, the distance between the low-frequency feed point 105 and one side of the metal shell 101 where the fracture is located is not more than 25 mm. The distance between the high-frequency feed point 106 and one side edge of the metal shell 101 where the fracture is located is not more than 25 mm. The high frequency feed 106 is closer to the break than the low frequency feed 105.
Specifically, the low frequency matching circuit 103 includes: and (4) a capacitor. One plate of the capacitor is connected to the coupling tab 108. The other plate of the capacitor is connected to the first output of the antenna switch 107. When the capacitor is a fixed capacitor, the adjustment of the low-frequency of the low-frequency matching circuit 103 can be adjusted by adjusting the size, shape, etc. of the coupling piece 108 in advance; when the capacitor is a variable capacitor, the adjustment of the low frequency matching circuit 103 can also be adjusted by adjusting the size of the capacitor.
Specifically, the high-frequency matching circuit 104 includes: at least one inductor 1042. In a preferred embodiment, the number of inductors 1042 is one. In another preferred embodiment, the number of the inductors 1042 is more than two. In this case, as shown in fig. 2, the high-frequency matching circuit 104 further includes: an inductive switch 1041. The inductive switch 1041 includes: an input terminal and a plurality of output terminals. The size of each inductor 1042 is generally different. Each output terminal of the inductor switch 1041 is connected to each inductor 1042, and the other terminal of each inductor 1042 is connected to the high frequency feed point 106. The inductor switch 1041 is used to connect a different inductor 1042 into the high frequency matching circuit 104. In this embodiment, the input terminal of the inductive switch 1041 is connected to the second output terminal of the antenna switch 107. Different outputs and inputs of the inductor switch 1041 are closed, so that different inductors 1042 are connected to the high-frequency matching circuit 104, and the high-frequency can be adjusted by the different inductors 1042.
Preferably, as shown in fig. 3, the antenna further includes: a metal sheet 112. A metal sheet 112 is arranged in the gap 109 between the high frequency feed 106 and the break. One end of the metal plate 112 is connected to the main reference ground 111, and the other end of the metal plate 112 is close to the high frequency feed point 106 of the antenna radiation arm 110. The metal plate 112 and the main reference ground 111 are connected and form a parasitic antenna portion, which can extend a high frequency bandwidth.
When the antenna operates in the low-frequency radiation mode, taking the antenna switch 107 as a single-pole double-throw switch as an example, as shown in fig. 4, the first output terminal of the antenna switch 107 is electrically connected to the input terminal of the antenna switch 107, and the second output terminal of the antenna switch 107 is electrically disconnected from the input terminal of the antenna switch 107. Feed 102 feeds low frequency matching circuit 103. The low frequency matching circuit 103 is independent of the high frequency matching circuit 104. The coupling tab 108 couples with the antenna radiating arm 110 to form a coupling feed. Under the same condition, the average radiation efficiency of the antenna adopting the feeding mode in the prior art in 824-960 MHz is 20%, while the average radiation efficiency of the antenna adopting the feeding mode in the embodiment in 824-960 MHz can reach 25%; in addition, the bandwidth of the antenna of the feeding mode of the embodiment in the low-frequency radiation mode can be improved by 1-2% compared with the bandwidth of the antenna of the prior art in the low-frequency radiation mode. Therefore, compared with the centralized capacitance single-point access, the bandwidth and the efficiency of the antenna are better.
When the antenna operates in the high-frequency radiation mode, taking the antenna switch 107 as a single-pole double-throw switch as an example, as shown in fig. 5, the second output terminal of the antenna switch 107 is electrically connected to the input terminal of the antenna switch 107, and the first output terminal of the antenna switch 107 is electrically disconnected from the input terminal of the antenna switch 107. Feed 102 feeds high frequency matching circuit 104. The antenna of the high-frequency radiation mode corresponds to a loop antenna, forms a high-frequency resonance, has the longest radiation path, and the high-frequency matching circuit 104 is independent of the low-frequency matching circuit 103, and the bandwidth and efficiency of the antenna are improved. In addition, if the antenna includes the metal plate 112, the metal plate 112 and the main reference ground 111 are connected and form a parasitic antenna portion, forming a high frequency second resonance, which can extend a high frequency bandwidth. The average radiation efficiency of the antenna of the high-frequency and low-frequency radiation mode shared matching circuit in the prior art at 1710-2700 MHz is 35%, the antenna of the embodiment can enable the high-frequency radiation mode to be independently matched with the high-frequency matching circuit 104, and the average radiation efficiency at 1710-2700 MHz is not lower than 40%; in addition, the bandwidth of the antenna in the high-frequency radiation mode of the feeding antenna of the present embodiment can be increased by about 2% as compared with the bandwidth of the antenna in the high-frequency radiation mode of the conventional antenna.
To sum up, the antenna according to the first embodiment of the present invention separates the low frequency matching circuit 103 from the high frequency matching circuit 104, and by setting the antenna switch 107, the low frequency matching circuit 103 and the high frequency matching circuit 104 can be connected to the same feed 102 and are independent from each other, wherein the low frequency feed point 105 is located on the coupling tab 108 in the slot 109, the high frequency feed point 106 is located on the antenna radiation arm 110, the low frequency radiation mode is realized by the low frequency matching circuit 103, the high frequency radiation mode is realized by the high frequency matching circuit 104, the low frequency matching circuit 103 and the high frequency matching circuit 104 are prevented from being shared, the antenna performance in a good wide frequency band can be realized, and the bandwidth and the efficiency are both good; further, a metal plate 112 may be provided so that the metal plate 112 and the main reference ground 111 are connected and form a parasitic antenna portion, forming a high frequency second resonance, which may extend a high frequency bandwidth.
Second embodiment
The second embodiment of the invention discloses an antenna. As shown in fig. 6, the antenna includes: the feed comprises a metal shell 601, a first feed 602, a second feed 607, a low-frequency matching circuit 603, a high-frequency matching circuit 604, a low-frequency feed point 605, a high-frequency feed point 606 and a coupling sheet 608.
The metal case 601 is provided with a slit 609. Slot 609 divides the metal housing into antenna radiating arm 610 and main reference ground 611. One side of the metal shell 601 has a break, and the gap 609 is communicated with the break. Coupling tab 608 is disposed in slot 609. The coupling tab 608 is typically a long strip of sheet metal. It should be understood that the shape of the coupling tab 608 is not limited thereto, and may be irregular sheet metal. The coupling tab 608 may be level or have a certain height difference with the slot 609 in the height direction. One end of the first feed 602 is grounded. The other end of the first feed 602 is connected to one end of the low frequency matching circuit 603. Preferably, a switch may be disposed between the other end of the first feed source 602 and one end of the low frequency matching circuit 603, and the on/off between the first feed source 602 and the low frequency matching circuit 603 is controlled by the on/off of the switch. One end of the second feed 607 is grounded. The other end of the second feed 607 is connected to one end of the high frequency matching circuit 604. Preferably, a switch may be disposed between the other end of the second feed source 607 and one end of the high-frequency matching circuit 604, and the on-off between the second feed source 607 and the high-frequency matching circuit 604 is controlled by the on-off of the switch. The other end of the low frequency matching circuit 603 is connected to a coupling patch 608. It should be understood that the connection point of the other end of the low frequency matching circuit 603 and the coupling patch 608 is a low frequency feed point 605. The other end of the high frequency matching circuit 604 is connected to the antenna radiating arm 610. It should be understood that the connection point of the other end of the high frequency matching circuit 604 to the antenna radiating arm 610 is the high frequency feed point 606. Preferably, the low frequency feed 605 and the high frequency feed 606 are both close to the break. More preferably, the distance between the low-frequency feed point 605 and one side of the metal shell 601 where the fracture is located is not more than 25 mm. The distance between the high-frequency feed point 606 and one side of the metal shell 601 where the fracture is located is not more than 25 mm. The high frequency feed 606 is closer to the break than the low frequency feed 605.
Specifically, the low frequency matching circuit 603 includes: and (4) a capacitor. One plate of the capacitor is connected to the coupling tab 608. The other plate of the capacitor is connected to the first feed 602. When the capacitor is a fixed capacitor, the adjustment of the low frequency matching circuit 603 can be performed by adjusting the size, shape, etc. of the coupling piece 608 in advance; when the capacitor is a variable capacitor, the adjustment of the low frequency matching circuit 603 can also be adjusted by adjusting the size of the capacitor.
Specifically, the high-frequency matching circuit 604 includes: at least one inductor 6042. In a preferred embodiment, the number of inductors 6042 is one. In another preferred embodiment, the number of inductors 6042 is two or more. In this case, as shown in fig. 7, the high frequency matching circuit further includes: an inductive switch 6041. The inductance switch 6041 includes: an input terminal and a plurality of output terminals. The size of each inductor 6042 is typically different. Each output terminal of the inductor switch 6041 is connected to each inductor 6042, and the other terminal of each inductor 6042 is connected to the high frequency feed point 606. The inductor switch 6041 is used to connect different inductors 6042 to the high-frequency matching circuit 604. In this embodiment, the input terminal of the inductive switch 6041 is connected to the second feed 607. Different inductors 6042 are connected to the high-frequency matching circuit 604 by closing different output terminals and input terminals of the inductor switch 6041, and the high-frequency can be adjusted by the different inductors 6042.
Preferably, as shown in fig. 8, the antenna further includes: a metal sheet 612. A metal sheet 612 is disposed in the gap 609 and between the high frequency feed 606 and the break. One end of the metal plate 612 is connected to the main reference ground 611 and the other end of the metal plate 612 is close to the high frequency feed point 606 of the antenna radiating arm 610. The metal plate 612 and the main reference ground 611 are connected and form a parasitic antenna portion, which can extend the high frequency bandwidth.
When the antenna works in a low-frequency radiation mode, the first feed source 602 feeds power to the low-frequency matching circuit 603, the low-frequency matching circuit 603 is independent of the high-frequency matching circuit 604, and the coupling sheet 608 is coupled with the antenna radiation arm 610 to form a coupled feed. Under the same condition, the average radiation efficiency of the antenna adopting the feeding mode of the prior art in 824-960 MHz is 20%, while the average radiation efficiency of the antenna adopting the feeding mode of the embodiment in 824-960 MHz can reach 25%; in addition, the bandwidth of the antenna of the feeding mode of the embodiment in the low-frequency radiation mode can be improved by 1-2% compared with the bandwidth of the antenna of the prior art in the low-frequency radiation mode. Therefore, compared with the centralized capacitance single-point access, the bandwidth and the efficiency of the antenna are better.
When the antenna works in a high-frequency radiation mode, the second feed source 607 feeds power to the high-frequency matching circuit 604, the antenna in the high-frequency radiation mode is equivalent to a loop antenna, high-frequency resonance is formed, and the radiation path is longest; and the high frequency matching circuit 604 is independent of the low frequency matching circuit 603, the bandwidth and efficiency of the antenna is improved. In addition, if the antenna includes the metal plate 612, the metal plate 612 and the main reference ground 611 are connected and form a parasitic antenna portion, forming a high frequency second resonance, which can extend a high frequency bandwidth. The average radiation efficiency of the antenna of the high-frequency and low-frequency radiation mode shared matching circuit in the prior art at 1710-2700 MHz is 35%, the antenna of the embodiment can enable the high-frequency radiation mode to be independently matched with the high-frequency matching circuit 604, and the average radiation efficiency at 1710-2700 MHz is not lower than 40%; in addition, the bandwidth of the antenna of the feeding method of the present embodiment in the high-frequency radiation mode can be increased by about 2% compared to the bandwidth of the antenna of the related art in the high-frequency radiation mode.
To sum up, the antenna according to the second embodiment of the present invention separates the low frequency matching circuit 603 and the high frequency matching circuit 604, and sets the first feed 602 connected to the low frequency matching circuit 603 and the second feed 607 connected to the high frequency matching circuit 604, so that the two are independent, wherein the low frequency feed point 605 is located on the coupling sheet 608 in the slot 609, the high frequency feed point 606 is located on the antenna radiation arm 610, the low frequency radiation mode is implemented by the low frequency matching circuit 603, the high frequency radiation mode is implemented by the high frequency matching circuit 604, and the low frequency matching circuit 603 and the high frequency matching circuit 604 are prevented from being shared, so that good antenna performance in a wide frequency band can be implemented, and the bandwidth and the efficiency are both good; in addition, a metal plate 612 may be further provided such that the metal plate 612 and the main reference ground 611 are connected and form a parasitic antenna portion, forming a high frequency second resonance, which may extend a high frequency bandwidth.
Third embodiment
The third embodiment of the invention discloses an antenna. As shown in fig. 9, the antenna includes: a metal housing 901, a feed 902, a low frequency matching circuit 903, a high frequency matching circuit 904, a low frequency feed point 905, a high frequency feed point 906 and an antenna switch 907.
The metal case 901 is provided with a slit 909. Slot 909 divides the metal housing into antenna radiating arm 910 and main reference ground 911. One side of the metal shell 901 has a fracture, and the gap 909 is communicated with the fracture. One end of feed 902 is grounded. An input of an antenna switch 907 is connected to the other end of the feed 902. A first output terminal of the antenna switch 907 is connected to one terminal of the low frequency matching circuit 903. A second output terminal of the antenna switch 907 is connected to one terminal of the high-frequency matching circuit 904. Specifically, the antenna switch 907 may be a single-pole double-throw switch or a combiner. When the antenna switch 907 is a single-pole double-throw switch, when the first output terminal of the antenna switch 907 is electrically connected with the input terminal of the antenna switch 907, the second output terminal of the antenna switch 907 is electrically disconnected with the input terminal of the antenna switch 907; when the second output terminal of the antenna switch 907 is electrically connected to the input terminal of the antenna switch 907, the first output terminal of the antenna switch 907 is electrically disconnected from the input terminal of the antenna switch 907. When the antenna switch 907 is a combiner, the first output terminal and the second output terminal of the antenna switch 907 may be electrically connected to the input terminal of the antenna switch 907 at the same time. The other end of the low frequency matching circuit 903 is connected to the antenna radiating arm 910. It should be understood that the connection point of the other end of the low frequency matching circuit 903 to the antenna radiating arm 910 is the low frequency feed point 905. The other end of the high frequency matching circuit 904 is connected to an antenna radiating arm 910. It should be understood that the connection point of the other end of the high frequency matching circuit 904 to the antenna radiating arm 910 is the high frequency feed point 906. Preferably, the low frequency feed point 905 and the high frequency feed point 906 are both close to the break. More preferably, the distance between the low-frequency feed point 905 and one side of the metal casing 901 where the fracture is located is not more than 25 mm. The distance between the high-frequency feed point 906 and one side edge of the metal shell 901 where the fracture is located is not more than 25 mm. The high frequency feed point 906 is closer to the break than the low frequency feed point 905.
Specifically, the low frequency matching circuit 903 includes: a variable capacitance. The variable capacitor changes the size of the capacitor by changing the relative effective area or the distance between the polar plates. One plate of the variable capacitor is connected to the antenna radiating arm 910. The other plate of the variable capacitor is connected to a first output terminal of the antenna switch 907. The low-frequency matching circuit 903 can adjust the low-frequency by adjusting the size of the variable capacitor.
Specifically, the high-frequency matching circuit 904 includes: more than two inductors. The structure of the high-frequency matching circuit 904 is the same as that of the high-frequency matching circuit having two or more inductors of the first embodiment, and is not described herein again.
Preferably, as shown in fig. 10, the antenna further includes: metal sheet 912. A metal sheet 912 is disposed in the gap 909 and between the high frequency feed 906 and the break. One end of the metal plate 912 is connected to the main reference ground 911, and the other end of the metal plate 912 is close to the high frequency feed point 906 of the antenna radiation arm 910. The metal plate 912 is connected to the main reference ground 911 and forms a parasitic antenna portion, which can extend the high frequency bandwidth.
When the antenna operates in the low-frequency radiation mode, as shown in fig. 11, the first output terminal of the antenna switch 907 is electrically connected to the input terminal of the antenna switch 907, and the second output terminal of the antenna switch 907 is electrically disconnected from the input terminal of the antenna switch 907. Feed 902 feeds low frequency matching circuit 903. The low frequency matching circuit 903 is independent of the high frequency matching circuit 904. Under the same condition, the average radiation efficiency of the antenna adopting the feeding mode in the prior art at 824-960 MHz is 20%, while the average radiation efficiency of the antenna adopting the feeding mode in the embodiment at 824-960 MHz can reach 25%; in addition, the bandwidth of the antenna of the feeding mode of the embodiment in the low-frequency radiation mode can be improved by 1-2% compared with the bandwidth of the antenna of the prior art in the low-frequency radiation mode. Thus, the bandwidth and efficiency of the antenna are better. By varying the size of the variable capacitance, the frequency of the antenna in the low frequency radiation mode can also be adjusted.
When the antenna operates in the high-frequency radiation mode, as shown in fig. 12, the second output terminal of the antenna switch 907 is electrically connected to the input terminal of the antenna switch 907, and the first output terminal of the antenna switch 907 is electrically disconnected from the input terminal of the antenna switch 907. The feed 902 feeds a high frequency matching circuit 904. The antenna of the high-frequency radiation pattern corresponds to a loop antenna, the radiation path is the longest, and the high-frequency matching circuit 904 is independent of the low-frequency matching circuit 903, and the bandwidth and efficiency of the antenna are improved. In addition, if the antenna includes the metal plate 912, the metal plate 912 is connected to the main reference ground 911 and forms a parasitic antenna portion, forming a high frequency second resonance, which can extend a high frequency bandwidth. The average radiation efficiency of the antenna of the high-frequency and low-frequency radiation mode shared matching circuit in the prior art at 1710-2700 MHz is 35%, the antenna of the embodiment can enable the high-frequency radiation mode to be independently matched with the high-frequency matching circuit 904, and the average radiation efficiency at 1710-2700 MHz is not lower than 40%; in addition, the bandwidth of the antenna of the feeding method of the present embodiment in the high-frequency radiation mode can be increased by about 2% compared to the bandwidth of the antenna of the related art in the high-frequency radiation mode.
To sum up, the antenna according to the third embodiment of the present invention separates the low-frequency matching circuit 903 and the high-frequency matching circuit 904, and sets the antenna switch 907, so that the low-frequency matching circuit 903 and the high-frequency matching circuit 904 can be connected to the same feed 902 and are independent from each other, wherein the low-frequency feed point 905 and the high-frequency feed point 906 are both located on the antenna radiation arm 910, the low-frequency radiation mode is implemented by the low-frequency matching circuit 903, the high-frequency radiation mode is implemented by the high-frequency matching circuit 904, the low-frequency matching circuit 903 and the high-frequency matching circuit 904 are prevented from being shared, and good antenna performance in a wide frequency band can be implemented, and both the bandwidth and the efficiency are good; in addition, a metal plate 912 can be arranged, so that the metal plate 912 is connected with the main reference ground 911 to form a parasitic antenna part, a high-frequency second resonance is formed, and the high-frequency bandwidth can be expanded.
Fourth embodiment
The fourth embodiment of the invention discloses an antenna. As shown in fig. 13, the antenna includes: a metal housing 1301, a first feed 1302, a second feed 1307, a low frequency matching circuit 1303, a high frequency matching circuit 1304, a low frequency feedpoint 1305, and a high frequency feedpoint 1306.
A slit 1309 is provided in the metal case 1301. Slot 1309 divides the metal housing into antenna radiating arm 1310 and main reference ground 1311. One side of the metal shell 1301 has a break, and the slit 1309 communicates with the break. One end of the first feed 1302 is grounded. The other end of the first feed 1302 is connected to one end of the low frequency matching circuit 1303. Preferably, a switch may be disposed between the other end of the first feed 1302 and one end of the low-frequency matching circuit 1303, and the on-off between the low first feed 1302 and the low-frequency matching circuit 1303 is controlled by the on-off of the switch. One end of the second feed 1307 is grounded. The other end of the second feed 1307 is connected to one end of the high-frequency matching circuit 1304. Preferably, a switch may be disposed between the other end of the second feed source 1307 and one end of the high-frequency matching circuit 1304, and the on-off between the second feed source 1307 and the high-frequency matching circuit 1304 is controlled by the on-off of the switch. The other end of the low frequency matching circuit 1303 is connected to the antenna radiating arm 1310. It should be appreciated that the connection point of the other end of the low frequency matching circuit 1303 to the antenna radiating arm 1310 is the low frequency feed point 1305. The other end of the high frequency matching circuit 1304 is connected to an antenna radiating arm 1310. It should be appreciated that the connection point of the other end of the high frequency matching circuit 1304 to the antenna radiating arm 1310 is the high frequency feed 1306. Preferably, the low frequency feed 1305 and the high frequency feed 1306 are both close to the break. More preferably, the distance between the low frequency feed point 1305 and one side of the metal shell 1301 where the fracture is located is not more than 25 mm. The distance between the high-frequency feed point 1306 and one side edge of the metal shell 1301 where the fracture is located does not exceed 25 mm. The high frequency feed 1306 is closer to the break than the low frequency feed 1305.
Specifically, the low frequency matching circuit 1303 includes: a variable capacitance. The variable capacitor changes the size of the capacitor by changing the relative effective area or the distance between the polar plates. One plate of the variable capacitor is connected to the antenna radiating arm 1310. The other plate of the variable capacitance is connected to a first feed 1302. The adjustment of the low frequency matching circuit 1303 can be realized by adjusting the size of the variable capacitor.
Specifically, the structure of the high-frequency matching circuit 1304 is the same as that of the high-frequency matching circuit of the third embodiment, and is not described herein again.
Preferably, as shown in fig. 14, the antenna further includes: metal sheets 1312. A metal sheet 1312 is disposed in the slot 1309 and between the high frequency feed 1306 and the break. One end of the metal plate 1312 is connected to the main reference ground 1311, and the other end of the metal plate 1312 is close to the high frequency feed 1306 of the antenna radiating arm 1310. The metal piece 1312 and the main reference ground 1311 are connected and form a parasitic antenna portion, which can extend a high frequency bandwidth.
When the antenna operates in a low-frequency radiation mode, the first feed 1302 feeds a low-frequency matching circuit 1303, and the low-frequency matching circuit 1303 is independent of the high-frequency matching circuit 1304. Under the same condition, the average radiation efficiency of the antenna adopting the feeding mode in the prior art at 824-960 MHz is 20%, while the average radiation efficiency of the antenna adopting the feeding mode in the embodiment at 824-960 MHz can reach 25%; in addition, the bandwidth of the antenna of the feeding mode of the embodiment in the low-frequency radiation mode can be improved by 1-2% compared with the bandwidth of the antenna of the prior art in the low-frequency radiation mode. Therefore, compared with the centralized capacitance single-point access, the bandwidth and the efficiency of the antenna are better.
When the antenna works in a high-frequency radiation mode, the second feed source 1307 feeds power to the high-frequency matching circuit 1304, the antenna in the high-frequency radiation mode is equivalent to a loop antenna, high-frequency resonance is formed, and the radiation path is longest; and the high frequency matching circuit 1304 is independent of the low frequency matching circuit 1303, the bandwidth and efficiency of the antenna are improved. In addition, if the antenna includes the metal sheet 1312, the metal sheet 1312 and the main reference ground 1311 are connected and form a parasitic antenna portion, forming a high frequency second resonance, which can extend a high frequency bandwidth. The average radiation efficiency of the antenna of the high-frequency and low-frequency radiation mode shared matching circuit in the prior art at 1710-2700 MHz is 35%, the antenna of the embodiment can enable the high-frequency radiation mode to be independently matched with the high-frequency matching circuit 1304, and the average radiation efficiency at 1710-2700 MHz is not lower than 40%; in addition, the bandwidth of the antenna of the feeding method of the present embodiment in the high-frequency radiation mode can be increased by about 2% compared to the bandwidth of the antenna of the related art in the high-frequency radiation mode.
To sum up, the antenna according to the fourth embodiment of the present invention separates the low frequency matching circuit 1303 and the high frequency matching circuit 1304, and sets the first feed 1302 connected to the low frequency matching circuit 1303 and the second feed 1307 connected to the high frequency matching circuit 1304, so that the two are independent, where the low frequency feed point 1305 and the high frequency feed point 1306 are both located on the antenna radiation arm 1310, the low frequency radiation mode is implemented by the low frequency matching circuit 1303, the high frequency radiation mode is implemented by the high frequency matching circuit 1304, thereby avoiding sharing the low frequency matching circuit 1303 and the high frequency matching circuit 1304, and implementing good antenna performance in a wide frequency band, and both bandwidth and efficiency are good; further, a metal piece 1312 may be further provided such that the metal piece 1312 and the main reference ground 1311 are connected and form a parasitic antenna portion, forming a high frequency second resonance, which may extend a high frequency bandwidth.
Fifth embodiment
The fifth embodiment of the invention discloses a mobile terminal. The mobile terminal may be, but is not limited to, a mobile phone, a tablet computer, MP3/MP4, a smart watch, a smart bracelet, a Personal Digital Assistant (PDA), an e-reader, a vehicle-mounted computer, and so on. The mobile terminal includes: the antenna of any of the embodiments above. The structure of the antenna is not described in detail herein.
To sum up, the low frequency matching circuit and the high frequency matching circuit of the antenna of the mobile terminal according to the fifth embodiment of the present invention are separated and independent from each other, and the low frequency matching circuit implements the low frequency radiation mode and the high frequency matching circuit implements the high frequency radiation mode, thereby avoiding the low frequency matching circuit and the high frequency matching circuit from being shared, and implementing good antenna performance in a wide frequency band, and having good bandwidth and efficiency.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention 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 invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An antenna, comprising: metal casing and at least one feed, its characterized in that, the antenna still includes: the low-frequency matching circuit, the high-frequency matching circuit, the low-frequency feed point and the high-frequency feed point;
a gap is arranged on the metal shell, the gap divides the metal shell into an antenna radiation arm and a main reference ground, a fracture is formed in one side edge of the metal shell, and the gap is communicated with the fracture;
one end of the feed source is grounded;
one end of the low-frequency matching circuit is connected with the other end of the feed source, the other end of the low-frequency matching circuit is connected with the low-frequency feed point, and the low-frequency feed point is positioned in the gap;
one end of the high-frequency matching circuit is connected with the other end of the feed source, the other end of the high-frequency matching circuit is connected with the high-frequency feed point, and the high-frequency feed point is positioned at the antenna radiation arm;
the antenna further includes: a coupling tab disposed in the slot;
the other end of the low-frequency matching circuit is connected with the coupling sheet, and a connection point of the other end of the low-frequency matching circuit and the coupling sheet is the low-frequency feed point;
wherein, the quantity of feed is one, the antenna still includes: the antenna switch, antenna switch's input is connected the other end of feed, antenna switch's first output is connected the one end of low frequency matching circuit, antenna switch's second output is connected the one end of high frequency matching circuit.
2. The antenna of claim 1, wherein: the number of the feeds is two, and the feeds comprise: the low-frequency matching circuit comprises a first feed source and a second feed source, wherein the other end of the first feed source is connected with one end of the low-frequency matching circuit, and the other end of the second feed source is connected with one end of the high-frequency matching circuit.
3. The antenna of claim 1, wherein the low frequency matching circuit comprises: and one polar plate of the capacitor is connected with the coupling sheet, wherein the capacitor is a fixed capacitor or a variable capacitor.
4. The antenna according to claim 1, wherein the high frequency matching circuit comprises: at least one inductor.
5. The antenna of claim 4, wherein: when the number of the inductors is two or more, the size of each inductor is different, and the high-frequency matching circuit further includes: an inductive switch, said inductive switch comprising: each output end of the inductance switch is connected with one end of each inductor, the other end of each inductor is connected with the high-frequency feed point, and the inductance switch is used for connecting different inductors into the high-frequency matching circuit.
6. The antenna of claim 1, further comprising: the metal sheet is arranged in the gap and located between the high-frequency feed point and the fracture, one end of the metal sheet is connected with the main reference ground, and the other end of the metal sheet is close to the high-frequency feed point of the antenna radiation arm.
7. The antenna of claim 1, wherein: the distance between the low-frequency feed point and one side edge of the metal shell where the fracture is located is not more than 25mm, the distance between the high-frequency feed point and one side edge of the metal shell where the fracture is located is not more than 25mm, and the high-frequency feed point is closer to the fracture than the low-frequency feed point.
8. An antenna, comprising: metal casing and at least one feed, its characterized in that, the antenna still includes: the low-frequency matching circuit, the high-frequency matching circuit, the low-frequency feed point and the high-frequency feed point;
a gap is arranged on the metal shell, the gap divides the metal shell into an antenna radiation arm and a main reference ground, a fracture is formed in one side edge of the metal shell, and the gap is communicated with the fracture;
one end of the feed source is grounded;
one end of the low-frequency matching circuit is connected with the other end of the feed source, the other end of the low-frequency matching circuit is connected with the antenna radiation arm, and a connection point of the other end of the low-frequency matching circuit and the antenna radiation arm is the low-frequency feed point;
one end of the high-frequency matching circuit is connected with the other end of the feed source, the other end of the high-frequency matching circuit is connected with the high-frequency feed point, and the high-frequency feed point is positioned at the antenna radiation arm;
the low frequency matching circuit includes: one polar plate of the variable capacitor is connected with the antenna radiation arm;
the antenna further includes: the antenna switch, antenna switch's input is connected the other end of feed, antenna switch's first output is connected the one end of low frequency matching circuit, antenna switch's second output is connected the one end of high frequency matching circuit.
9. A mobile terminal, comprising: an antenna as claimed in any one of claims 1 to 8.
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| CN201710184632.1A CN106953176B (en) | 2017-03-24 | 2017-03-24 | Antenna and mobile terminal |
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| CN201710184632.1A CN106953176B (en) | 2017-03-24 | 2017-03-24 | Antenna and mobile terminal |
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| CN106953176B true CN106953176B (en) | 2021-03-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107369892B (en) * | 2017-09-01 | 2019-08-30 | 电子科技大学 | A kind of multifrequency terminal antenna for full metal jacket |
| CN108306117B (en) * | 2017-12-29 | 2020-11-17 | 瑞声科技(新加坡)有限公司 | Antenna system and terminal |
| CN108270068A (en) * | 2018-01-11 | 2018-07-10 | 青岛海信电子设备股份有限公司 | Terminal with all-metal rear shell |
| CN108390148B (en) * | 2018-02-02 | 2020-07-07 | 青岛海信移动通信技术股份有限公司 | Terminal with all-metal backshell |
| CN110911842B (en) * | 2018-09-17 | 2021-05-28 | 青岛海信移动通信技术股份有限公司 | Terminal with radiating body antenna |
| CN111585054B (en) * | 2019-02-18 | 2021-11-05 | 荣耀终端有限公司 | Tuning device, antenna device and terminal equipment |
| CN111029754B (en) * | 2019-12-31 | 2021-10-22 | 联想(北京)有限公司 | Electronic equipment and antenna setting method |
| CN113594678A (en) * | 2021-07-30 | 2021-11-02 | 维沃移动通信有限公司 | Antenna device and electronic apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8779999B2 (en) * | 2011-09-30 | 2014-07-15 | Google Inc. | Antennas for computers with conductive chassis |
| CN105306631B (en) * | 2015-09-30 | 2018-08-17 | 努比亚技术有限公司 | A kind of antenna and mobile terminal |
| CN105633552A (en) * | 2015-12-25 | 2016-06-01 | 宇龙计算机通信科技(深圳)有限公司 | Combined antenna system and mobile terminal |
| CN105609956B (en) * | 2016-02-02 | 2019-02-01 | 惠州硕贝德无线科技股份有限公司 | A kind of high-isolation antenna applied to segmented metal back cover mobile phone |
| CN105870593B (en) * | 2016-04-11 | 2019-02-26 | 上海安费诺永亿通讯电子有限公司 | A kind of high-isolation carrier wave polymerization antenna and electronic equipment |
| CN105789884A (en) * | 2016-04-19 | 2016-07-20 | 惠州硕贝德无线科技股份有限公司 | Cell phone antenna structure based on metallic back cover |
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