CN104412450A - Antenna and mobile terminal - Google Patents
Antenna and mobile terminal Download PDFInfo
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- CN104412450A CN104412450A CN201480001768.9A CN201480001768A CN104412450A CN 104412450 A CN104412450 A CN 104412450A CN 201480001768 A CN201480001768 A CN 201480001768A CN 104412450 A CN104412450 A CN 104412450A
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Abstract
The invention discloses an antenna and a mobile terminal, relates to the technical field of antennas, and aims to reduce the space of the antenna, increase the bandwidth of the antenna, and improve the efficiency of the antenna. The antenna comprises a first radiator and an interdigital capacitor, one end of the interdigital capacitor, far away from the first radiator, is provided with a feeding point, the other end of the interdigital capacitor is electrically connected with the first radiator, a free end of the first radiator is provided with a first grounding point, the first radiator bends to form a protruding structure, and the length of the first radiator satisfies a preset value.
Description
Technical field
The present invention relates to antenna technical field, particularly relate to a kind of antenna and mobile terminal.
Background technology
Antenna is wireless device for carrying out receiving and the device of electromagnetic signals, and along with the arriving of forth generation mobile communication, the bandwidth requirement for end product is also more and more higher.The wireless terminal possessing multimode (GSM/WCDMA/CDMA/LTE) and reception diversity technology is the current and following prior development direction of industry, and increase along with LTE band number object, in product competition, the broadband of antenna and miniaturization seem particularly important.
Antenna of the prior art is difficult to subtracting the undersized increase simultaneously realized in bandwidth, and cannot ensure, at high band and low-frequency range, all there is higher efficiency, antenna efficiency is improved in order to increase bandwidth, common way on the feed circuit of antenna, adds the match circuit of lamped element (series capacitance and shunt inductance) increase low frequency bandwidth, but lamped element is by the impact of the accuracy of manufacture, be difficult to the consistency ensureing product, and the power consumption of antenna can be made to increase, and to improving the limited use of low frequency bandwidth, when more with the element of antenna match, match circuit easily and radio circuit mismatch, affect the debugging efforts of antenna, therefore, the antenna of prior art is difficult to while realizing antenna miniaturization, increase bandwidth and raise the efficiency.
Summary of the invention
Embodiments of the invention provide a kind of antenna and mobile terminal, can reduce antenna space, increase the beamwidth of antenna, improve antenna efficiency.
Embodiments of the invention adopt following technical scheme:
First aspect, embodiments provide a kind of antenna, comprise the first radiant body and interdigital capacitor, one end away from described first radiant body of described interdigital capacitor is provided with distributing point, the other end of described interdigital capacitor is electrically connected with described first radiant body, the free end of described first radiant body is provided with the first earth point, and described first radiant body bending is in bulge-structure, and the length of described first radiant body meets predetermined value.
In conjunction with first aspect, in the implementation that the first is possible, described interdigital capacitor comprises:
First coupling part and the second coupling part, described second coupling part is connected with described first radiant body one end;
Described first coupling part comprises the first branch and the some sub-branches along described first distribution, the described sub-branch of each described first branch is all electrically connected with described first branch, and being equipped with gap between two adjacent sub-branches of described first coupling part, the sub-branch of described first branch one end is provided with described distributing point;
Described second coupling part comprises the second branch and the some sub-branches along described second distribution, and the described sub-branch of each described second branch is all electrically connected with described second branch, and is equipped with gap between two adjacent sub-branches of described second coupling part;
Each sub-branch in each sub-branch in described second branch and described first branch is staggered, be provided with the sub-branch of described second branch in each gap between the sub-branch of described first branch, and be not in contact with each other between described second coupling part and described first coupling part.
In conjunction with the first possibility of first aspect, in the implementation that the second is possible,
The sub-branch of described first branch comprises the first sub-branch, the second sub-branch and the 3rd sub-branch, one end of described first sub-branch is electrically connected with described first branch, the other end is provided with described distributing point, described second sub-branch, between described first sub-branch and described 3rd sub-branch, described first sub-branch, forms the first gap and the second gap between the second sub-branch and the 3rd sub-branch;
The sub-branch of described second branch comprises the 4th sub-branch, the 5th sub-branch and the 6th sub-branch, described 4th sub-branch is positioned at described first gap, described 5th sub-branch is positioned at described second gap, and described 6th sub-branch is positioned at outside described 3rd sub-branch.
In conjunction with the second possibility of first aspect, in the implementation that the third is possible, one end of described first radiant body is electrically connected with described interdigital capacitor by described second branch.
In conjunction with first aspect or first aspect the first may or first aspect the second may or the third of first aspect may, in the 4th kind of possible implementation, described antenna also comprises the second radiant body, described second radiant body is roughly in inverted L shape structure, and one end of described second radiant body is electrically connected with described first earth point.
The second in conjunction with first aspect may, in the 5th kind of possible implementation, state antenna and also comprise the 3rd radiant body, described 3rd radiant body is " Contraband " type structure, one end of described 3rd radiant body is electrically connected with described first branch, and described 3rd radiant body is arranged away from described first radiant body.
In conjunction with the 5th kind of possibility of first aspect, in the 6th kind of possible implementation, described antenna also comprises the 4th radiant body, described 4th radiant body is roughly in inverted L shape structure, described 4th radiant body comprises grounding arm and the first radiation arm, and described first radiation arm is electrically connected with one end of described grounding arm, and the other end of described grounding arm is provided with the second earth point, described first radiation arm closes on described 3rd radiant body, and extends to the direction away from described interdigital capacitor.
In conjunction with the 6th kind of possibility of first aspect, in the 7th kind of possible implementation, described 4th radiant body also comprises the second radiation arm, described second radiation arm is between described first radiation arm and described second earth point, and be electrically connected with described grounding arm, and being provided with gap between described first radiation arm and described second radiation arm, described second radiation arm and described first radiation arm are arranged in the same way.
In conjunction with the 4th kind of possibility of first aspect, in the 8th kind of possible implementation, described second radiant body is provided with lamped element, and described lamped element is and the inductance that described second radiant body is connected or the electric capacity in parallel with described second radiant body.
Second aspect, the embodiment of the present invention is also supplied to a kind of mobile terminal, comprises RF processing unit, baseband processing unit and antenna; Wherein,
Described antenna comprises the first radiant body and interdigital capacitor, one end away from described first radiant body of described interdigital capacitor is provided with distributing point, the other end of described interdigital capacitor is electrically connected with described first radiant body, the free end of described first radiant body is provided with the first earth point, described first radiant body bending is in bulge-structure, and the length of described first radiant body meets predetermined value;
Described RF processing unit is electrically connected with described distributing point;
Described antenna, gives described RF processing unit for the transmission of wireless signals that will receive, or transmitting of RF processing unit is converted to electromagnetic wave, send; Described RF processing unit, wireless signal for receiving described antenna carries out frequency-selecting, amplification, down-converted, and convert thereof into intermediate-freuqncy signal or baseband signal sends to described baseband processing unit, or, for baseband signal that described baseband processing unit is sent or intermediate-freuqncy signal through up-conversion, amplification, sent by described antenna; Described baseband processing unit, processes the described intermediate-freuqncy signal received or described baseband signal.
In conjunction with second aspect, in the implementation that the first is possible, described interdigital capacitor comprises: the first coupling part and the second coupling part, and described second coupling part is connected with described first radiant body one end;
Described first coupling part comprises the first branch and the some sub-branches along described first distribution, the described sub-branch of each described first branch is all electrically connected with described first branch, and being equipped with gap between two adjacent sub-branches of described first coupling part, one end of the sub-branch of described first branch one end is provided with described distributing point;
Described second coupling part comprises the second branch and the some sub-branches along described second distribution, and the described sub-branch of each described second branch is all electrically connected with described second branch, and is equipped with gap between two adjacent sub-branches of described second coupling part;
Each sub-branch in each sub-branch in described second branch and described first branch is staggered, be provided with the sub-branch of described second coupling part in each gap between the sub-branch of described first coupling part, and be not in contact with each other between described second coupling part and described first coupling part.
In conjunction with the first possibility of second aspect, in the implementation that the second is possible,
The sub-branch of described first branch comprises the first sub-branch, the second sub-branch and the 3rd sub-branch, one end of described first sub-branch is electrically connected with described first branch, the other end is provided with described distributing point, described second sub-branch, between described first sub-branch and described 3rd sub-branch, described first sub-branch, forms the first gap and the second gap between the second sub-branch and the 3rd sub-branch;
The sub-branch of described second branch comprises the 4th sub-branch, the 5th sub-branch and the 6th sub-branch, described 4th sub-branch is positioned at described first gap, described 5th sub-branch is positioned at described second gap, and described 6th sub-branch is positioned at outside described 3rd sub-branch.
In conjunction with the second possibility of second aspect, in the implementation that the third is possible, one end of described first radiant body is electrically connected with described interdigital capacitor by described second branch.
In conjunction with second aspect, or the third of the first possibility of second aspect or the second possibility of second aspect or second aspect may, in the 4th kind of possible implementation, described antenna also comprises the second radiant body, described second radiant body is roughly in inverted L shape structure, and one end of described second radiant body is electrically connected with described first earth point.
The second in conjunction with second aspect may, in the 5th kind of possible implementation, described antenna also comprises the 3rd radiant body, described 3rd radiant body is " Contraband " type structure, one end of described 3rd radiant body is electrically connected with described first sub-branch, one end of described 3rd radiant body is electrically connected with described first branch, and described 3rd radiant body is arranged away from described first radiant body.
In conjunction with the 5th kind of possibility of second aspect, in the 6th kind of possible implementation, described antenna also comprises the 4th radiant body, described 4th radiant body is roughly in inverted L shape structure, described 4th radiant body comprises grounding arm and the first radiation arm, and described first radiation arm is electrically connected with one end of described grounding arm, and the other end of described grounding arm is provided with the second earth point, described first radiation arm closes on described 3rd radiant body, and extends to the direction away from described interdigital capacitor.
In conjunction with the 6th kind of possibility of second aspect, in the 7th kind of possible implementation, described 4th radiant body also comprises the second radiation arm, described second radiation arm is between described first radiation arm and described second earth point, and be electrically connected with described grounding arm, and being provided with gap between described first radiation arm and described second radiation arm, described second radiation arm and described first radiation arm are arranged in the same way.
In conjunction with the 4th kind of possibility of second aspect, in the 8th kind of possible implementation, described second radiant body is provided with lamped element, and described lamped element is and the inductance that described second radiant body is connected or the electric capacity in parallel with described second radiant body.
The antenna that the embodiment of the present invention provides and mobile terminal, described antenna comprises the first radiant body and interdigital capacitor, one end away from described first radiant body of described interdigital capacitor is provided with distributing point, the other end of described interdigital capacitor is electrically connected with described first radiant body, the free end of described first radiant body is provided with the first earth point, described first radiant body bending is in bulge-structure, and the length of described first radiant body meets predetermined value.Described interdigital capacitor and the first radiant body can be equivalent to series capacitance and shunt inductance, thus can low-frequency resonant be produced, and utilize the increase of described interdigital capacitor for generation of the coupling amount of low-frequency resonant, described bulge-structure can ensure the track lengths of antenna when not increasing antenna space, and, the length of described first radiant body meets predetermined value, be conducive to described first radiant body and produce described first resonance frequency, to solve when antenna space is less, be difficult to provide the coupling amount needed for antenna low-frequency resonant because conventional capacitive coupling amount is less and the less problem of the low frequency bandwidth caused, simultaneously, it also avoid and add match circuit for increasing bandwidth, thus reduce the power consumption of antenna.Thus, can antenna space be reduced, increase the beamwidth of antenna, improve antenna efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The schematic diagram one of the antenna that Fig. 1 provides for the embodiment of the present invention;
The schematic diagram of the interdigital capacitor of the antenna that Fig. 2 provides for the embodiment of the present invention;
The schematic diagram two of the antenna that Fig. 3 provides for the embodiment of the present invention;
The schematic diagram three of the antenna that Fig. 4 provides for the embodiment of the present invention;
The schematic diagram four of the antenna that Fig. 5 provides for the embodiment of the present invention;
The schematic diagram five of the antenna that Fig. 6 provides for the embodiment of the present invention;
The schematic diagram of the 4th radiant body of the antenna that Fig. 7 provides for the embodiment of the present invention;
The schematic diagram six of the antenna that Fig. 8 provides for the embodiment of the present invention;
The schematic diagram of a kind of test structure of the antenna that Fig. 9 provides for the embodiment of the present invention;
Figure 10 is the return loss plot of antenna K1 in Fig. 9;
Figure 11 is the return loss plot of antenna K2 in Fig. 9;
Figure 12 is the efficiency chart of antenna K1 and antenna K2 in Fig. 9;
The schematic diagram of the another kind of test structure of the antenna that Figure 13 provides for the embodiment of the present invention;
Figure 14 is the S parameter simulation result figure of antenna K1 and antenna K2 in Figure 13;
Figure 15 is the efficiency simulation result figure of antenna K1 and antenna K2 in Figure 13;
The schematic diagram of a kind of mobile terminal that Figure 16 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
With reference to Fig. 1, Fig. 1 is a specific embodiment of a kind of antenna of the embodiment of the present invention, antenna described in the present embodiment is positioned on printed circuit board (PCB) 1, described antenna comprises the first radiant body 2 and interdigital capacitor 3, one end away from the first radiant body 2 of interdigital capacitor 3 is provided with distributing point a, and the other end of interdigital capacitor 3 is electrically connected with the first radiant body 2, and the free end of the first radiant body 2 is provided with the first earth point c, first radiant body 2 bends in bulge-structure, and the length of the first radiant body 2 is predetermined value.First radiant body 2, interdigital capacitor 3 are for generation of the first resonance frequency f1.
The antenna that the embodiment of the present invention provides, comprise the first radiant body 2 and interdigital capacitor 3, one end away from the first radiant body 2 of interdigital capacitor 3 is provided with distributing point a, the other end of interdigital capacitor 3 is electrically connected with the first radiant body 2, the free end of the first radiant body 2 is provided with the first earth point c, first radiant body 2 bends in bulge-structure, and the length of the first radiant body 2 meets predetermined value.Interdigital capacitor 3 and the first radiant body 2 can be equivalent to series capacitance and shunt inductance, low-frequency resonant can be produced, interdigital capacitor 3 is utilized to increase the coupling amount produced needed for low-frequency resonant, described bulge-structure can ensure the track lengths of antenna when not increasing antenna space, the length of the first radiant body 2 meets predetermined value, be conducive to generation first resonance frequency f1, to solve when antenna space is less, be difficult to provide the coupling amount needed for antenna low-frequency resonant because conventional capacitive coupling amount is less and the less problem of the low frequency bandwidth caused, simultaneously, it also avoid and add match circuit for increasing bandwidth, thus reduce the power consumption of antenna.In addition, interdigital gap long by the finger changing interdigital capacitor 3 or interdigital number change the equivalent series capacitance value of interdigital capacitor, thus can conservative control low-frequency resonant, reach the object of spread bandwidth.Thus, can antenna space be reduced, increase the beamwidth of antenna.
It should be noted that, when the total length of guarantee first radiant body 2 is constant, the shape of described bulge-structure can be arbitrary shape.
Concrete, described first radiant body 2 and described interdigital capacitor 3 can form the a-g-c section in the antenna and Fig. 1 that can produce low-frequency resonant, wherein, the c-g section of the first radiant body 2 in Fig. 1 can be equivalent to shunt inductance, interdigital capacitor 3 can be equivalent to relative to series capacitance, thus can be used for generation first resonance frequency f1 (size is about 900MHz).
Further, interdigital capacitor 3 comprises: the first coupling part and the second coupling part, and described second coupling part is connected with described first radiant body one end;
Some sub-branches that described first coupling part comprises the first branch 31 and distributes along described first branch 31, each described sub-branch is all electrically connected with described first branch 31, and being equipped with gap between two adjacent sub-branches of described first coupling part, one end of the sub-branch of first branch 31 one end is provided with distributing point a;
Some sub-branches that described second coupling part comprises the second branch 32 and distributes along the second branch 32, the sub-branch of each second branch 32 is all electrically connected with the second branch 32, and is equipped with gap between two adjacent sub-branches of described second coupling part;
Each sub-branch in each sub-branch in described second branch 32 and described first branch 31 is staggered, be provided with the sub-branch of described second branch 32 in each gap of described first branch 31, and be not in contact with each other between described second coupling part and described first coupling part.
With reference to Fig. 2, particularly, the sub-branch of the first branch 31 comprises the first sub-branch 312 of sub-branch 311, second and the 3rd sub-branch 313, one end of first sub-branch 311 is electrically connected with the first branch 31, the other end is provided with distributing point a, second sub-branch 312 between the first sub-branch 311 and the 3rd sub-branch 313, the first sub-branch 311 and form the first gap 33 and the second gap 34 between the second sub-branch 312 and described 3rd sub-branch 313;
The sub-branch of the second branch 32 comprises the 4th sub-branch 321, the 5th sub-branch 322 and the 6th sub-branch 323, in 4th sub-branch 321 first gap 33,5th sub-branch of sub-branch 322 the 5th is positioned at the second gap the 34, six sub-branch 323 and is located at outside the 3rd sub-branch 313.
When interdigital capacitor 3 comprises described first coupling part and the second coupling part, and described first coupling part comprises the first sub-branch 312 of sub-branch 311, second and the 3rd sub-branch 313, described second coupling part comprise the 4th sub-branch 321, the 5th sub-branch 322 and the 6th sub-branch 323 time:
One end of first radiant body 2 is electrically connected with interdigital capacitor 3 by the second branch 32.
With reference to Fig. 3, described antenna also comprises the second radiant body 4, second radiant body 4 is roughly in inverted L shape structure, and one end of the second radiant body 4 is electrically connected with the first earth point c, the c-h section of the second radiant body 4 is for generation of the second resonance frequency f2 (size is about 750MHz), thus by the first resonance frequency f1 and the second resonance frequency f2, the low frequency frequency range of 698MHz-960MHz can be covered preferably, thus expand the bandwidth of antenna.
With reference to Fig. 4, it is " Contraband " type structure that described antenna also comprises the 3rd radiant body the 5, three radiant body 5, and one end of the 3rd radiant body 5 is electrically connected with the first branch 31, and the 3rd radiant body 5 is arranged away from the first radiant body 2.Thus the 3rd radiant body 5 is electrically connected with distributing point a, 3rd radiant body 5 of described " Contraband " type is for generation of the 3rd resonance frequency f3 (size is about 1600MHz), and the 3rd resonance frequency f3 is conducive to described antenna cover high frequency band scope as high-frequency resonant.
With reference to Fig. 5, described antenna also comprises the 4th radiant body 6,4th radiant body 6 is roughly in inverted L shape structure, 4th radiant body 6 comprises grounding arm 63 and the first radiation arm 61, first radiation arm 61 is electrically connected with one end of grounding arm 63, the other end of grounding arm 63 is provided with the second earth point b, and described first radiation arm 61 closes on described 3rd radiant body 5, and extends to the direction away from described interdigital capacitor 3.
Wherein, the b-e section of the 4th radiant body 6 can be coupled with the first sub-branch 311 of interdigital capacitor 3, produces the 4th resonance frequency f4 (size is about 2500MHz-2600MHz).
With reference to Fig. 6 and Fig. 7,4th radiant body 6 also comprises the second radiation arm 62, second radiation arm 62 is between the first radiation arm 61 and the second earth point b, and be electrically connected with grounding arm 63, and being provided with gap between the first radiation arm 61 and the second radiation arm 62, the second radiation arm 62 and the first radiation arm 61 are arranged in the same way.First radiation arm 61 and the second radiation arm 62 all produce high-frequency resonant, can improve the return loss of described antenna in high-frequency band.
Wherein, the b-d section of the 4th radiant body 6 can be coupled with the first sub-branch 311 of interdigital capacitor 3, produce the 4th resonance frequency f4 (size is about 2500MHz), thus by the 3rd resonance frequency f3 and the 4th resonance frequency f4, the high-frequency band of 1400MHz-2700MHz can be covered preferably, and improve the return loss of described antenna in high-frequency band.
With reference to Fig. 8, second radiant body 4 also can arrange lamped element 7, lamped element 7 can be and the inductance that the second radiant body 4 is connected or the electric capacity in parallel with the second radiant body 4, can when the second radiant body 4 length be less, make the second radiant body 4 still can produce the second resonance frequency f2 (size is about 750MHz), thus reduce antenna size further.
In sum, described first resonance frequency f1 and described second resonance frequency f2 can cover the low frequency frequency range of 698MHz-960MHz, described 3rd resonance frequency f3 and described 4th resonance frequency f4 can cover the high-frequency band of 1400MHz-2700MHz, thus can realize the object of spreading antenna bandwidth in less space.
It should be noted that, the frame mode realizing antenna of the present invention can be printing formula, can also be the form of support+FPC (flexible PCB) or the form of support+Stamping (stamping parts).
Embodiment two
With reference to Fig. 9, antenna described in embodiment one, for antenna described in embodiment one, is arranged to test structure according to the layout type shown in Fig. 8 by the embodiment of the present invention, and has carried out emulation testing and actual test.
As shown in Figure 9, the printed circuit board (PCB) 1 being of a size of 172mm × 145mm arranges antenna K1 and antenna K2, antenna K1 and antenna K2 is the antenna described in embodiment one, and the headroom of antenna K1 is 20mm × 55mm, the headroom of antenna K2 is 20mm × 50mm, described antenna comprises: the first radiant body 2, interdigital capacitor 3, the second radiant body 4, in L-type is the 3rd radiant body 5 and the 4th radiant body 6 of " Contraband " type.
Wherein, interdigital capacitor 3 comprises described first coupling part and described second coupling part, one end away from the first radiant body 2 of interdigital capacitor 3 is provided with distributing point a, one end of first radiant body 2 is connected with the second branch 32, the other end is provided with the first earth point c, one end of second radiant body 3 is connected with the first earth point c, one end of 3rd radiant body 5 is connected with the first branch 31,4th radiant body 6 comprises the first radiation arm 61, second width and penetrates arm 62 and grounding arm 63, and one end of grounding arm 63 is provided with the second earth point b.
With reference to Figure 10, Figure 10 is the return loss plot of antenna K1, wherein, abscissa represents frequency (Frequency is called for short Freq), and unit is Gigahertz (GHz), ordinate represents return loss, unit is decibel (dB), and the solid line in Figure 10 is measured result, and dotted line is simulation result.Can find out, the actual measurement of antenna K1 and the low frequency operating frequency (return loss is lower than-6dB) of emulation minimum all can reach 698MHz (megahertz) left and right, low frequency operation bandwidth can cover the frequency band range of 698MHz-960MHz, the actual measurement of antenna K1 and the high-frequency work frequency (return loss is lower than-6dB) of emulation can reach about 2700MHz, and high-frequency work bandwidth can cover the frequency band range of 1400MHz-2700MHz.
With reference to Figure 11, Figure 11 is the return loss plot of antenna K2, wherein, abscissa represents frequency (Frequency is called for short Freq), and unit is Gigahertz (GHz), ordinate represents return loss, unit is decibel (dB), and in Figure 11, solid line is measured result, and dotted line is simulation result.Can find out, the actual measurement of antenna K2 and the low frequency operating frequency (return loss is lower than-6dB) of emulation minimum all can reach 698MHz (megahertz) left and right, low frequency operation bandwidth can cover the frequency band range of 698MHz-960MHz, the actual measurement of antenna K2 and the high-frequency work frequency (return loss is lower than-6dB) of emulation can reach about 2700MHz, and high-frequency work bandwidth can cover the frequency band range of 1400MHz-2700MHz.
With reference to Figure 12, Figure 12 is the efficiency by inputoutput test figure of antenna K1 and K2, wherein, abscissa represents frequency (Frequency, be called for short Freq), unit is Gigahertz (GHz), and ordinate represents antenna efficiency, solid line is the measured result of antenna K1, and dotted line is the measured result of antenna K2.Can find out, the efficiency by inputoutput test of antenna K1 and K2 within the scope of the low-frequency band of 698MHz-960MHz is substantially all greater than 50%, and the efficiency within the scope of the high frequency band of 1400MHz-2700MHz is substantially all greater than 60%.Thus effectively improve the operating efficiency of antenna.
Embodiment three
As shown in figure 13, antenna described in embodiment one, for antenna described in embodiment one, arranges according to the layout type shown in Figure 11 by the embodiment of the present invention, has carried out emulation testing and actual test.
With reference to Figure 13, the printed circuit board (PCB) 1 being of a size of 120mm × 120mm arranges antenna K1 and antenna K2, antenna K1 and antenna K2 is the antenna described in embodiment one, and the headroom of antenna K1 and antenna K2 is 20mm × 60mm, described antenna comprises: the first radiant body 2, interdigital capacitor 3, the second radiant body 4, in L-type is the 3rd radiant body 5 and the 4th radiant body 6 of " Contraband " type.
Wherein, interdigital capacitor 3 comprises described first coupling part and described second coupling part, one end away from the first radiant body 2 of interdigital capacitor 3 is provided with distributing point a, one end of first radiant body 2 is connected with the second branch 32, the other end is provided with the first earth point c, one end of second radiant body 3 is connected with the first earth point c, one end of 3rd radiant body 5 is connected with the first branch 31,4th radiant body 6 comprises the first radiation arm 61, second width and penetrates arm 62 and grounding arm 63, and one end of grounding arm 63 is provided with the second earth point b.
As shown in figure 14, Figure 14 is the S parameter figure of antenna K1 and K2, described S parameter comprises the isolation of return loss and antenna, abscissa represents frequency (Frequency, be called for short Freq), unit is Gigahertz (GHz), ordinate represents S parameter, unit is decibel (dB), in Figure 14, curve S 11b is the simulation result of the return loss of antenna K1, curve S 11a is the simulation result of the return loss of antenna K2, curve S 21 is the simulation result of the isolation of antenna K1 and antenna K2, can find out, low frequency operating frequency (return loss the is lower than-6dB) simulation result of antenna K1 and antenna K2 is minimum all can reach 698MHz (megahertz) left and right, low frequency operation bandwidth can cover the frequency band range of 698MHz-960MHz, the simulation result of the high-frequency work frequency (return loss is lower than-6dB) of antenna K1 and antenna K2 all can reach about 2700MHz, high-frequency work bandwidth can cover the frequency band range of 1400MHz-2700MHz, as can be seen from curve S 21, the low frequency isolation degree of antenna K1 and antenna K2 can reach about-17dB, and at the isolation of whole frequency range all at below-11dB.
With reference to Figure 15, Figure 15 is the analogous diagram of the efficiency of antenna K1 and antenna K2, wherein, abscissa represents frequency (Frequency, be called for short Freq), unit is Gigahertz (GHz), and ordinate represents antenna efficiency, solid line is the measured result of antenna K1, and dotted line is the measured result of antenna K2.Can find out, the efficiency by inputoutput test of antenna K1 and K2 within the scope of the low-frequency band of 698MHz-960MHz is substantially all greater than 60%, and the efficiency within the scope of the high frequency band of 1400MHz-2700MHz is substantially all greater than 70%, thus effectively improves the operating efficiency of antenna.
Described in integrated embodiment two and embodiment three, the antenna described in the embodiment of the present invention, can produce low-frequency resonant and high-frequency resonant, and Frequency can cover 698MHz-960MHz, and higher frequency can cover 1400MHz-2700MHz.And be greater than 50% in the efficiency of low frequency frequency range, 60% is greater than in the efficiency of high-frequency band, thus the bandwidth of antenna can be expanded in less space, improve the efficiency of antenna, also can avoid carrying out raising efficiency by match circuit, and avoid the extra power consumption that produced by match circuit, and eliminate the debug process to match circuit, thus the debug process of antenna can be simplified.
Embodiment four
Embodiments provide a kind of mobile terminal, as shown in figure 16, described mobile terminal comprises RF processing unit, baseband processing unit and antenna; Wherein,
Antenna described in the present embodiment is positioned on printed circuit board (PCB) 1, described antenna comprises the first radiant body 2 and interdigital capacitor 3, one end away from the first radiant body 2 of interdigital capacitor 3 is provided with distributing point a, the other end of interdigital capacitor 3 is electrically connected with the first radiant body 2, the free end of the first radiant body 2 is provided with the first earth point c, first radiant body 2 bends in bulge-structure, and the length of the first radiant body 2 meets predetermined value;
Described RF processing unit is electrically connected with distributing point a;
Described antenna, gives described RF processing unit for the transmission of wireless signals that will receive, or transmitting of RF processing unit is converted to electromagnetic wave, send; Described RF processing unit, wireless signal for receiving described antenna carries out frequency-selecting, amplification, down-converted, and convert thereof into intermediate-freuqncy signal or baseband signal sends to described baseband processing unit, or, for baseband signal that described baseband processing unit is sent or intermediate-freuqncy signal through up-conversion, amplification, sent by described antenna; Described baseband processing unit, processes the described intermediate-freuqncy signal received or described baseband signal.
It should be noted that, the frame mode realizing antenna of the present invention can be printing formula, can also be the form of support+FPC (flexible PCB) or the form of support+Stamping (stamping parts).
Certainly, the antenna described in the present embodiment also can comprise any one antenna structure described in embodiment one, embodiment two, embodiment three, specifically can reference example one, embodiment two, antenna described in embodiment three, does not repeat them here.Wherein, above-mentioned mobile terminal for the communication apparatus used in movement, can be able to be on the mobile terminal products such as mobile phone, CPE (customer terminal equipment), panel computer, certainly be not limited thereto
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (18)
1. an antenna, it is characterized in that, comprise the first radiant body and interdigital capacitor, one end away from described first radiant body of described interdigital capacitor is provided with distributing point, the other end of described interdigital capacitor is electrically connected with described first radiant body, the free end of described first radiant body is provided with the first earth point, and described first radiant body bending is in bulge-structure, and the length of described first radiant body meets predetermined value.
2. antenna according to claim 1, is characterized in that, described interdigital capacitor comprises:
First coupling part and the second coupling part, described second coupling part is connected with described first radiant body one end;
Described first coupling part comprises the first branch and the some sub-branches along described first distribution, the described sub-branch of each described first branch is all electrically connected with described first branch, and being equipped with gap between two adjacent sub-branches of described first coupling part, the sub-branch of described first branch one end is provided with described distributing point;
Described second coupling part comprises the second branch and the some sub-branches along described second distribution, and the described sub-branch of each described second branch is all electrically connected with described second branch, and is equipped with gap between two adjacent sub-branches of described second coupling part;
Each sub-branch in each sub-branch in described second branch and described first branch is staggered, be provided with the sub-branch of described second branch in each gap between the sub-branch of described first branch, and be not in contact with each other between described second coupling part and described first coupling part.
3. antenna according to claim 2, is characterized in that,
The sub-branch of described first branch comprises the first sub-branch, the second sub-branch and the 3rd sub-branch, one end of described first sub-branch is electrically connected with described first branch, the other end is provided with described distributing point, described second sub-branch, between described first sub-branch and described 3rd sub-branch, described first sub-branch, forms the first gap and the second gap between the second sub-branch and the 3rd sub-branch;
The sub-branch of described second branch comprises the 4th sub-branch, the 5th sub-branch and the 6th sub-branch, described 4th sub-branch is positioned at described first gap, described 5th sub-branch is positioned at described second gap, and described 6th sub-branch is positioned at outside described 3rd sub-branch.
4. antenna according to claim 3, is characterized in that, one end of described first radiant body is electrically connected with described interdigital capacitor by described second branch.
5. the antenna according to any one of claim 1-4, is characterized in that, described antenna also comprises the second radiant body, and described second radiant body is roughly in inverted L shape structure, and one end of described second radiant body is electrically connected with described first earth point.
6. antenna according to claim 3, it is characterized in that, described antenna also comprises the 3rd radiant body, and described 3rd radiant body is " Contraband " type structure, one end of described 3rd radiant body is electrically connected with described first branch, and described 3rd radiant body is arranged away from described first radiant body.
7. antenna according to claim 6, it is characterized in that, described antenna also comprises the 4th radiant body, described 4th radiant body is roughly in inverted L shape structure, described 4th radiant body comprises grounding arm and the first radiation arm, and described first radiation arm is electrically connected with one end of described grounding arm, and the other end of described grounding arm is provided with the second earth point, described first radiation arm closes on described 3rd radiant body, and extends to the direction away from described interdigital capacitor.
8. antenna according to claim 7, it is characterized in that, described 4th radiant body also comprises the second radiation arm, described second radiation arm is between described first radiation arm and described second earth point, and be electrically connected with described grounding arm, and being provided with gap between described first radiation arm and described second radiation arm, described second radiation arm and described first radiation arm are arranged in the same way.
9. antenna according to claim 5, is characterized in that, described second radiant body is provided with lamped element, and described lamped element is and the inductance that described second radiant body is connected or the electric capacity in parallel with described second radiant body.
10. a mobile terminal, is characterized in that, comprises RF processing unit, baseband processing unit and antenna; Wherein,
Described antenna comprises the first radiant body and interdigital capacitor, one end away from described first radiant body of described interdigital capacitor is provided with distributing point, the other end of described interdigital capacitor is electrically connected with described first radiant body, the free end of described first radiant body is provided with the first earth point, described first radiant body bending is in bulge-structure, and the length of described first radiant body meets predetermined value;
Described RF processing unit is electrically connected with described distributing point;
Described antenna, gives described RF processing unit for the transmission of wireless signals that will receive, or transmitting of RF processing unit is converted to electromagnetic wave, send; Described RF processing unit, wireless signal for receiving described antenna carries out frequency-selecting, amplification, down-converted, and convert thereof into intermediate-freuqncy signal or baseband signal sends to described baseband processing unit, or, for baseband signal that described baseband processing unit is sent or intermediate-freuqncy signal through up-conversion, amplification, sent by described antenna; Described baseband processing unit, processes the described intermediate-freuqncy signal received or described baseband signal.
11. mobile terminals according to claim 10, is characterized in that, described interdigital capacitor comprises: the first coupling part and the second coupling part, and described second coupling part is connected with described first radiant body one end;
Described first coupling part comprises the first branch and the some sub-branches along described first distribution, the described sub-branch of each described first branch is all electrically connected with described first branch, and being equipped with gap between two adjacent sub-branches of described first coupling part, one end of the sub-branch of described first branch one end is provided with described distributing point;
Described second coupling part comprises the second branch and the some sub-branches along described second distribution, and the described sub-branch of each described second branch is all electrically connected with described second branch, and is equipped with gap between two adjacent sub-branches of described second coupling part;
Each sub-branch in each sub-branch in described second branch and described first branch is staggered, be provided with the sub-branch of described second coupling part in each gap between the sub-branch of described first coupling part, and be not in contact with each other between described second coupling part and described first coupling part.
12. mobile terminals according to claim 11, is characterized in that,
The sub-branch of described first branch comprises the first sub-branch, the second sub-branch and the 3rd sub-branch, one end of described first sub-branch is electrically connected with described first branch, the other end is provided with described distributing point, described second sub-branch, between described first sub-branch and described 3rd sub-branch, described first sub-branch, forms the first gap and the second gap between the second sub-branch and the 3rd sub-branch;
The sub-branch of described second branch comprises the 4th sub-branch, the 5th sub-branch and the 6th sub-branch, described 4th sub-branch is positioned at described first gap, described 5th sub-branch is positioned at described second gap, and described 6th sub-branch is positioned at outside described 3rd sub-branch.
13. mobile terminals according to claim 12, is characterized in that, one end of described first radiant body is electrically connected with described interdigital capacitor by described second branch.
14. mobile terminals according to any one of claim 10-13, it is characterized in that, described antenna also comprises the second radiant body, and described second radiant body is roughly in inverted L shape structure, and one end of described second radiant body is electrically connected with described first earth point.
15. mobile terminals according to claim 12, it is characterized in that, described antenna also comprises the 3rd radiant body, described 3rd radiant body is " Contraband " type structure, one end of described 3rd radiant body is electrically connected with described first sub-branch, one end of described 3rd radiant body is electrically connected with described first branch, and described 3rd radiant body is arranged away from described first radiant body.
16. mobile terminals according to claim 15, it is characterized in that, described antenna also comprises the 4th radiant body, described 4th radiant body is roughly in inverted L shape structure, described 4th radiant body comprises grounding arm and the first radiation arm, and described first radiation arm is electrically connected with one end of described grounding arm, and the other end of described grounding arm is provided with the second earth point, described first radiation arm closes on described 3rd radiant body, and extends to the direction away from described interdigital capacitor.
17. mobile terminals according to claim 16, it is characterized in that, described 4th radiant body also comprises the second radiation arm, described second radiation arm is between described first radiation arm and described second earth point, and be electrically connected with described grounding arm, and being provided with gap between described first radiation arm and described second radiation arm, described second radiation arm and described first radiation arm are arranged in the same way.
18. mobile terminals according to claim 14, is characterized in that, described second radiant body is provided with lamped element, and described lamped element is and the inductance that described second radiant body is connected or the electric capacity in parallel with described second radiant body.
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Application publication date: 20150311 |