CN109687111B - Antenna structure and communication terminal - Google Patents
Antenna structure and communication terminal Download PDFInfo
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- CN109687111B CN109687111B CN201811638282.2A CN201811638282A CN109687111B CN 109687111 B CN109687111 B CN 109687111B CN 201811638282 A CN201811638282 A CN 201811638282A CN 109687111 B CN109687111 B CN 109687111B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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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
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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
- H01Q5/10—Resonant antennas
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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
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/28—Arrangements for establishing polarisation or beam width over two or more different wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- 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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Abstract
The invention provides an antenna structure and a communication terminal, wherein the antenna structure comprises: the antenna comprises a first antenna radiator, a second antenna radiator, a matching network, a frequency selection network and a signal source; the first antenna radiator and the second antenna radiator are coupled through a gap, one end, far away from the gap, of the first antenna radiator is grounded, a feed point is arranged on the first antenna radiator, and one end, far away from the gap, of the second antenna radiator is grounded; the first end of the matching network is connected with the feed point, and the second end of the matching network is connected with the first end of the signal source; the first end of the frequency selection network is connected with the first position of the second antenna radiator, and the second end of the frequency selection network is grounded; the second end of the signal source is grounded; the antenna structure is configured to simultaneously generate a first resonance, a second resonance, a third resonance, and a fourth resonance. One gap can excite four resonances, which is helpful for realizing more antenna frequency bands by one broken gap, and can reduce the number of the broken gaps, and simultaneously improve the simplicity of appearance and the structural strength of the whole machine.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an antenna structure and a communication terminal.
Background
With the rapid development of terminal technology, communication terminals have become an essential tool in people's life, and bring great convenience to various aspects of user's life. A plurality of antennas generally exist on a communication terminal, and particularly, the frequency bands and the number of the antennas of the 5G terminal will be more and more in the future. However, in the prior art, if more antennas are to be implemented or more frequency bands are to be covered, more broken seams and complex circuit structures need to be arranged on the communication terminal to implement more antenna coverage, so that the appearance of the communication terminal is not simple.
Disclosure of Invention
The embodiment of the invention provides an antenna structure and a communication terminal, and aims to solve the problem that the appearance of the communication terminal is not simple due to the fact that multiple resonances can be excited to realize multi-antenna frequency band coverage by arranging multiple broken joints and complex circuit structures on an antenna when the communication terminal is required to have more and more antennas and frequency bands.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides an antenna structure, including: the antenna comprises a first antenna radiator, a second antenna radiator, a matching network, a frequency selection network and a signal source;
the first antenna radiator and the second antenna radiator are coupled through a gap, one end, far away from the gap, of the first antenna radiator is grounded, a feed point is arranged on the first antenna radiator, and one end, far away from the gap, of the second antenna radiator is grounded;
the first end of the matching network is connected with the feed point, and the second end of the matching network is connected with the first end of the signal source;
a first end of the frequency-selective network is connected with a first position of the second antenna radiator, a second end of the frequency-selective network is grounded, the first position is located between the first end of the second antenna radiator and the second end of the second antenna radiator, the first end of the second antenna radiator is an end of the second antenna radiator close to the gap, and the second end of the second antenna radiator is an end of the second antenna radiator grounded;
the second end of the signal source is grounded;
the antenna structure is used for simultaneously generating a first resonance, a second resonance, a third resonance and a fourth resonance.
In a second aspect, an embodiment of the present invention further provides a communication terminal, including the above antenna structure.
An antenna structure according to an embodiment of the present invention includes: the antenna comprises a first antenna radiator, a second antenna radiator, a matching network, a frequency selection network and a signal source; the first antenna radiator and the second antenna radiator are coupled through a gap, one end, far away from the gap, of the first antenna radiator is grounded, a feed point is arranged on the first antenna radiator, and one end, far away from the gap, of the second antenna radiator is grounded; the first end of the matching network is connected with the feed point, and the second end of the matching network is connected with the first end of the signal source; a first end of the frequency-selective network is connected with a first position of the second antenna radiator, a second end of the frequency-selective network is grounded, the first position is located between the first end of the second antenna radiator and the second end of the second antenna radiator, the first end of the second antenna radiator is an end of the second antenna radiator close to the gap, and the second end of the second antenna radiator is an end of the second antenna radiator grounded; the second end of the signal source is grounded; the antenna structure is used for simultaneously generating a first resonance, a second resonance, a third resonance and a fourth resonance. One gap can excite four resonances, which is helpful for realizing more antenna frequency bands by one broken gap, and can reduce the number of the broken gaps, and simultaneously improve the simplicity of appearance and the structural strength of the whole machine.
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 exercise.
Fig. 1 is a schematic structural diagram of an antenna structure according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of an antenna structure according to an embodiment of the present invention;
fig. 3 is a third schematic structural diagram of an antenna structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the standing-wave ratio of the antenna provided by the embodiment of the invention;
fig. 5 is a fourth schematic structural diagram of an antenna structure according to an 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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an antenna structure according to an embodiment of the present invention, and as shown in fig. 1, the antenna structure includes a first antenna radiator 1, a second antenna radiator 2, a matching network 3, a frequency selection network 4, and a signal source 5; the first antenna radiator 1 and the second antenna radiator 2 are coupled through a gap, one end, far away from the gap, of the first antenna radiator 1 is grounded, a feed point 11 is arranged on the first antenna radiator 1, and one end, far away from the gap, of the second antenna radiator 2 is grounded; a first end of the matching network 3 is connected with the feeding point 11, and a second end of the matching network 3 is connected with a first end of the signal source 5; a first end of the frequency selective network 4 is connected to a first position 21 of the second antenna radiator 2, a second end of the frequency selective network 4 is grounded, the first position 21 is located between a first end 22 of the second antenna radiator 2 and a second end 23 of the second antenna radiator 2, the first end 22 of the second antenna radiator 2 is an end of the second antenna radiator 2 close to the slot, and the second end 23 of the second antenna radiator 2 is an end of the second antenna radiator 2 grounded; the second end of the signal source 5 is grounded; the antenna structure is used for simultaneously generating a first resonance, a second resonance, a third resonance and a fourth resonance.
In this embodiment, the first antenna radiator 1 may also include a first end 12 and a second end 13, where the first end 12 may be an end close to the slot, and the second end 13 may be an end of the first antenna radiator 1 grounded. The first antenna radiator 1 may be a first antenna element or a first antenna resonating arm; the second antenna radiator 2 may be a second antenna element or a second antenna resonating arm.
In this embodiment, the antenna structure in fig. 1 may be, but is not limited to, a medium-high frequency (1710 to 2690MHz) and an ultra-high frequency (uhf) antenna architecture, and the uhf antenna may include frequency bands of N78(3300 to 3800MHz) and N79(4400 to 5000 MHz). The first antenna radiator 1 and the second antenna radiator 2 are made of a metal conductive material, and may be made of a common FPC, PDS, or LDS material. The first antenna radiator 1 and the second antenna radiator 2 may also be part of a metal middle frame or a metal back cover. One end of the first antenna radiator 1, which is far away from the gap, is grounded to form a first antenna unit; one end of the second antenna radiator 2, which is far away from the slot, is grounded to form a second antenna unit. The above-mentioned feeding point 11 is an access point for the signal source 5.
In this embodiment, the gap is located between the first antenna radiator 1 and the second antenna radiator 2, and the gap may be air or filled with a non-conductive material, such as plastic. The gap between the first antenna radiator 1 and the second antenna radiator 2 is equivalent to a coupling capacitor Cp, and the size of the coupling capacitor Cp mainly depends on the area of the end surfaces of the first end 12 of the first antenna radiator 1 and the first end 22 of the second antenna radiator 2, the width of the gap, and the medium filled in the gap.
In this embodiment, the excitation process of the second antenna radiator 2 is as follows: after the rf energy reaches the first end 12 via the metal arm between the feed point 11 and the first end 12 of the first antenna radiator 1 through the signal source 5, the matching network 3, the rf energy is transferred to the second antenna radiator 2 through the slot (equivalent to the coupling capacitance Cp).
In this embodiment, the resonant frequency of the first resonance f1 may be an intermediate frequency, and the resonant frequency may be 1.7 GHz. The resonance frequency of the second resonance f2 may be a high frequency, which may be 2.7 GHz. The resonant frequency of the third resonance f3 can be a frequency band of 5G N79, which is 4400-5000 MHz. The resonant frequency of the fourth resonance f4 can be a frequency band of 5G N78, which is 3300-3800 MHz.
In this embodiment, the first resonance f1 can be generated by ground excitation of the first antenna radiator 1, and controlling the length of the first antenna radiator 1 can tune the resonance frequency of the first resonance f 1. The second resonance f2 results from the ground excitation of the second antenna radiator 2, and changing the length of the second antenna radiator 2 enables tuning of the resonance frequency of the second resonance f 2. It should be noted that since the first resonance f1 and the second resonance f2 are mainly related to the length of the antenna radiator, and control the corresponding ground arm length, or further adjust in conjunction with the matching network 3, the first resonance f1 can also be generated by grounding the second antenna radiator 2, and similarly, the second resonance f2 can also be generated by grounding the first antenna radiator 1. Furthermore, controlling the respective ground arm lengths, or further adjusting in combination with the matching network 3, does not have a large effect on the other two resonances (third resonance f3 and fourth resonance f 4).
The third resonance f3 results from the ground excitation of the first antenna radiator 1 and the third resonance f3 is also related to the position of the feed point 11, and changing the length of the first antenna radiator 1 alone does not have a large effect on the third resonance f 3. The fourth resonance f4 is excited by the metal arm between the first position 21 and the first end 22 of the second antenna radiator 2 and the frequency-selective network 4 added at the first position 21, and changing the length of the second antenna radiator 2 alone does not have a large effect on the fourth resonance f 4.
In this embodiment, the third resonance f3 is generated by grounding and exciting the first antenna radiator 1, the third resonance f3 frequency point electric field is distributed on the first antenna radiator 1 in a three-quarter-wavelength-like distribution, and the third resonance f3 at the feeding point 11 and the second end 23 is weaker and close to zero. The gap and the electric field in the middle of the feeding point 11 and the second end 13 are strong field regions. The length between the feeding point 11 and the first end 12 in this embodiment may be smaller than the length between the feeding point 11 and the second end 13, and such a layout is generally recommended, so that each resonant mode is relatively clear, and no particularly complicated matching optimization is required. Tuning the resonance frequency of the third resonance f3 can be achieved by controlling the length of the first antenna radiator 1 and the position of the feed point 11. Since the metal body between the feeding point 11 and the first end 12 of the first antenna radiator 1 also affects the third resonance f3, when the position of the feeding point 11 is changed, the length of the metal body between the feeding point 11 and the first end 12 of the first antenna radiator 1 is also changed, thereby affecting the resonance frequency of the third resonance f 3. Thus, tuning the resonance frequency of the third resonance f3 can be achieved by controlling the length of the first antenna radiator 1 and the position of the feed point 11. The fourth resonance f4 is excited by the metal arm between the first location 21 and the first end 22 of the second antenna radiator 2 and the frequency selective network 4 added at the first location 21.
In this embodiment, four resonances can be excited simultaneously by fully utilizing one slot on a communication terminal (e.g. a 5G communication terminal), but not limited to the antenna combination of 4G intermediate frequency, high frequency, 5G N78 and 5G N79 in the example of four different functional frequency bands, and 4G and 5G can exist simultaneously. The total number of the antennas and the gaps of the whole machine is reduced while the hardware requirement is realized, compared with four independent antennas, the structure space occupied by a plurality of feed networks (including radio frequency feeders, test seats, matching networks, feed spring plate structures and the like) is saved, and meanwhile, the number of the gaps is reduced, so that the structural strength is improved, and the overall product requirement of simple appearance is met. Moreover, adjustable elements such as switches are not used while a plurality of frequency bands are covered, and cost saving is facilitated.
Optionally, the first resonance is excited by the first antenna radiator 1; the second resonance is excited by the second antenna radiator 2; the third resonance is excited by the first antenna radiator 1, and the position of the feeding point 11 affects the third resonance; the fourth resonance is excited by the metal arm between the first end 22 of the second antenna radiator 2 and the first location 21 and the frequency selective network 4.
In this embodiment, the first resonance is excited by the first antenna radiator 1; the second resonance is excited by the second antenna radiator 2; the third resonance is excited by the first antenna radiator 1, and the position of the feeding point 11 affects the third resonance; the fourth resonance is excited by the metal arm between the first end 22 of the second antenna radiator 2 and the first location 21 and the frequency selective network 4. Thus, four resonances can be generated by one slot, and the structural strength of the antenna structure is improved.
Optionally, the resonant frequency of the first resonance is smaller than the resonant frequency of the second resonance, the resonant frequency of the second resonance is smaller than the resonant frequency of the fourth resonance, and the resonant frequency of the fourth resonance is smaller than the resonant frequency of the third resonance.
In this embodiment, the resonance frequency of the first resonance is lower than the resonance frequency of the second resonance, the resonance frequency of the second resonance is lower than the resonance frequency of the fourth resonance, and the resonance frequency of the fourth resonance is lower than the resonance frequency of the third resonance.
Optionally, the frequency-selective network 4 includes a first inductor L1 and a first capacitor C1;
a first terminal of the first inductor L1 is connected to the first location 21, and a second terminal of the first inductor L1 is connected to a first terminal of the first capacitor C1;
the second terminal of the first capacitor C1 is grounded.
For better understanding of the above arrangement, please refer to fig. 2, and fig. 2 is a schematic structural diagram of an antenna structure according to an embodiment of the present invention. As shown in fig. 2, a first terminal of the first inductor L1 is connected to the first position 21, and a second terminal of the first inductor L1 is connected to a first terminal of the first capacitor C1; the second terminal of the first capacitor C1 is grounded.
In this embodiment the second resonance f2 and the fourth resonance f4 can be tuned in combination with the length of the second antenna radiator 2, the length between the first location 21 and the first end 22 and the values of the first inductance L1 and the first capacitance C1 in the frequency selective network 4.
Optionally, the frequency-selective network 4 further includes a second inductor L2, and the second inductor L2 is connected in parallel with the first capacitor C1.
For better understanding of the above arrangement, please refer to fig. 3, and fig. 3 is a schematic structural diagram of an antenna structure according to an embodiment of the present invention. As shown in fig. 3, the second inductor L2 is connected in parallel with the first capacitor C1.
In this embodiment, if the frequency-selective network 4 only has the first inductor L1 and the first capacitor C1, which is equivalent to the second antenna radiator 2 grounded through a capacitor, the performance of the resonant frequency part excited by the second antenna radiator 2 may be sacrificed. Therefore, the second inductor L2 is connected in parallel with the first capacitor C1 and then connected in series with the first inductor L1, which is equivalent to that the second antenna radiator 2 is grounded through a large inductor, so that the influence of the addition of the frequency selection network on the frequency offset of the resonance excited by the second antenna radiator 2 can be reduced, and the radiation performance of the antenna can be improved. Certainly, the frequency selective network 4 may be a two-port network with different characteristics, and both ends of the frequency selective network 4 may be connected to the first location 21 and the ground end respectively, or connected to the ground end and the first location 21 respectively, which is equivalent to the effect.
In this embodiment, the length between the first position 21 and the first end 22 of the second antenna radiator 2 corresponds to the natural resonant length of N78, the frequency-selective network 4 is ideally equivalent to zero ohm for the N78 frequency band, the metal arm between the first position 21 and the first end 22 of the second antenna radiator 2 is equivalent to zero ohm grounding at the first position 21, a second parasitic antenna is formed between the first end 22 and the grounding point of the frequency-selective network 4, and the resonance generated by excitation is the fourth resonance f 4. In practical application, the connection of the frequency-selecting network 4 is equivalent to an impedance tuning function, and can be equivalent to an inductor, a capacitor or zero ohm, and plays a role in tuning the electrical length. May be adjusted according to the length between the first position 21 and the first end 22 of the second antenna radiator 2. In order to reduce as much as possible the influence of the access of the frequency selective network 4 on the second resonance f2 generated by the first parasitic antenna formed by the second antenna radiator 2, the frequency selective network 4 may satisfy the following characteristics:
for the N78 band close to the band pass characteristic, the out-of-band frequency point, especially the frequency point near the resonant frequency band of the second resonance f2, needs to be equivalent to a larger inductance, such as 10nh or more. The aperture tuning effect of the access of the frequency selection network 4 on the second resonance f2 is reduced as much as possible, and the smaller the equivalent inductance, the greater the influence on the second resonance f2, and the smaller the opposite influence. Of course, these are not absolutely invariable in practical engineering applications. The second resonance f2 and the fourth resonance f4 may be tuned in combination with adjusting the length of the second antenna radiator 2, the length between the first location 21 and the first end 22, and the values of the first inductance L1, the first capacitance C1, and the second inductance L2 in the frequency selective network 4.
In this way, by simultaneously exciting four antenna resonances without a switch while sharing one antenna slot, the combination of the LTE and sub-6G functional antennas of medium-high frequency and sub-6G (including N78 and N79) as described in this embodiment is beneficial to reducing the layout space, reducing the number of slots, improving the structural strength, and improving the appearance. Corresponding standing wave ratio referring to fig. 4, fig. 4 is a schematic diagram of the standing wave ratio of the antenna provided by the embodiment of the present invention.
As shown in fig. 4, the first resonance f1 is a medium frequency (1.7GHz) resonance excited by the first antenna radiator 1; the second resonance f2 is the high frequency (2.7GHz) resonance excited by the second antenna radiator 2; the third resonance f3 is the resonance 5G N79 excited by the first antenna radiator 1; the fourth resonance f4 is the resonance 5G N78 excited by the metal arm between the first position 21 and the first end 22 of the second antenna radiator 2.
Optionally, the antenna structure further includes an antenna tuning circuit 6;
the first end of the antenna tuning circuit 6 is connected to the second position 14 of the first antenna radiator 1, the second end of the antenna tuning circuit 6 is grounded, and the second position 14 is located between the feeding point 11 and the grounded end of the first antenna radiator 1.
For better understanding of the above arrangement, please refer to fig. 5, and fig. 5 is a schematic structural diagram of an antenna structure according to an embodiment of the present invention. As shown in fig. 5, a first end of the antenna tuning circuit 6 is connected to a second position 14 of the first antenna radiator 1, a second end of the antenna tuning circuit 6 is grounded, and the second position 14 is located between the feeding point 11 and the grounded end of the first antenna radiator 1, that is, the second position 14 is located between the feeding point 11 and the second end 13.
In this embodiment, in a practical application, a communication terminal may have a poor environment (such as full screen narrow headroom), and in this case, a relatively large frequency band that is difficult to be covered by the antenna bandwidth may be added with an antenna tuning circuit 6 between the feeding point 11 and the second end 13 of the first antenna radiator 1 in order to improve the bandwidth continuously, so that aperture tuning of the first resonance f1 excited by the first antenna radiator 1 in the 4G LTE band may be implemented, and the purpose of optimizing the high-frequency bandwidth in the whole may be achieved.
Optionally, the antenna tuning circuit 6 includes an antenna switch or an adjustable capacitor.
In this embodiment, the antenna tuning circuit 6 may be an antenna switch or an adjustable capacitor. In the case of an antenna switch, a corresponding lumped element inductor, capacitor or combination of inductor and capacitor is added to each RF branch of the switch for tuning.
Optionally, a length between the feeding point 11 and the first end 12 of the first antenna radiator 1 is smaller than a length between the feeding point 11 and the second end 13 of the first antenna radiator 1, the first end 12 of the first antenna radiator 1 is an end of the first antenna radiator 1 close to the slot, and the second end 13 of the first antenna radiator 1 is an end of the first antenna radiator 1 grounded.
In this embodiment, the third resonance f3 may be excited when the length between the feed point 11 and the first end 12 of the first antenna radiator 1 is greater than the length between the feed point 11 and the second end 13 of the first antenna radiator 1. However, the mode corresponding to the third resonance f3 changes, and needs to be comprehensively optimized by adjusting the position accessed by the optimized feeding point 11 and the matching network 3, and the tuning generally has little influence on the other three resonances (the first resonance f1, the second resonance f2 and the fourth resonance f4), and is complex to adjust.
In this way, making the length between the feed point 11 and the first end 12 of the first antenna radiator 1 smaller than the length between the feed point 11 and the second end 13 of the first antenna radiator 1 makes it possible to reduce the influence on the first resonance f1, the second resonance f2 and the fourth resonance f4 and to simplify the process of tuning.
Optionally, the gap is filled with a non-conductive material.
In this embodiment, the gap is filled with a non-conductive material, which can improve the structural strength of the antenna structure and make the antenna structure more beautiful.
Optionally, the antenna structure is a part of a metal middle frame of the communication terminal, or a part of a metal rear cover of the communication terminal.
In this embodiment, the antenna structure is a part of a metal middle frame of the communication terminal or a part of a metal rear cover of the communication terminal, and can be selected according to actual conditions, so as to meet a suitable setting mode. The antenna structure may be made of a common material such as FPC, PDS, or LDS.
Optionally, the resonance bandwidth of the antenna structure includes 1710-2690 MHz frequency band, 3300-3800 MHz frequency band and 4400-5000 MHz frequency band.
In this embodiment, the resonance bandwidth of the antenna structure includes but not limited to 1710 ~ 2690MHz frequency band, 3300 ~ 3800MHz frequency band and 4400 ~ 5000MHz frequency band, for example GPS L5(1.2G) also can be realized with similar mode excitation to can cover a plurality of frequency bands, reach and reduce the gap quantity, improve the brief degree of outward appearance simultaneously and make antenna structure's adaptability stronger.
The antenna structure of the embodiment of the invention comprises a first antenna radiator 1, a second antenna radiator 2, a matching network 3, a frequency selection network 4 and a signal source 5; the first antenna radiator 1 and the second antenna radiator 2 are coupled through a gap, one end, far away from the gap, of the first antenna radiator 1 is grounded, a feed point 11 is arranged on the first antenna radiator 1, and one end, far away from the gap, of the second antenna radiator 2 is grounded; a first end of the matching network 3 is connected with the feeding point 11, and a second end of the matching network 3 is connected with a first end of the signal source 5; a first end of the frequency selective network 4 is connected to a first position 21 of the second antenna radiator 2, a second end of the frequency selective network 4 is grounded, the first position 21 is located between a first end 22 of the second antenna radiator 2 and a second end 23 of the second antenna radiator 2, the first end 22 of the second antenna radiator 2 is an end of the second antenna radiator 2 close to the slot, and the second end 23 of the second antenna radiator 2 is an end of the second antenna radiator 2 grounded; the second end of the signal source 5 is grounded; the antenna structure is used for simultaneously generating a first resonance, a second resonance, a third resonance and a fourth resonance.
Therefore, the appearances of the metal middle frame and the like can be fully utilized under the condition that a switch is not used, four resonance modes are simultaneously excited by one radiation gap of the communication terminal, the functional combination of four antenna resonance frequency bands can be simultaneously realized on one antenna structure, and the coexistence requirement of the 4G LTE and the 5G NR antenna is realized. Such as 'medium-high frequency and sub-6G (including 5G N78 and 5G N79)' antennas of sub6-G communication terminals (communication terminals below 6 GHz), the resonance bandwidth covers 1710-2690 MHz frequency band, 3300-3800 MHz frequency band and 4400-5000 MHz frequency band. The total number of the antenna and the gap can be reduced while the design requirement of the antenna is met, the cost is saved, the structural space occupied by a total feed network (comprising a radio frequency feed line, a test seat, a matching network, a feed spring structure and the like) is reduced, and meanwhile, the reduction of the number of the gap is also beneficial to improving the structural strength and meeting the overall product requirement of simple appearance.
The embodiment of the invention also provides a communication terminal which comprises the antenna structure.
In this embodiment, the communication terminal may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or the like.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. 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 apparatus that comprises the element.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. An antenna structure, comprising: the antenna comprises a first antenna radiator, a second antenna radiator, a matching network, a frequency selection network and a signal source;
the first antenna radiator and the second antenna radiator are coupled through a gap, one end, far away from the gap, of the first antenna radiator is grounded, a feed point is arranged on the first antenna radiator, and one end, far away from the gap, of the second antenna radiator is grounded;
the first end of the matching network is connected with the feed point, and the second end of the matching network is connected with the first end of the signal source;
a first end of the frequency-selective network is connected with a first position of the second antenna radiator, a second end of the frequency-selective network is grounded, the first position is located between the first end of the second antenna radiator and the second end of the second antenna radiator, the first end of the second antenna radiator is an end of the second antenna radiator close to the gap, and the second end of the second antenna radiator is an end of the second antenna radiator grounded;
the second end of the signal source is grounded;
the antenna structure is used for simultaneously generating a first resonance, a second resonance, a third resonance and a fourth resonance under the condition of not adopting a switch;
the first resonance is excited by the first antenna radiator; the second resonance is excited by the second antenna radiator; the third resonance is excited by the first antenna radiator and the location of the feed point affects the third resonance; the fourth resonance is excited by the metal arm between the first end of the second antenna radiator and the first location and the frequency selective network.
2. The antenna structure according to claim 1, characterized in that the resonance frequency of the first resonance is smaller than the resonance frequency of the second resonance, the resonance frequency of the second resonance is smaller than the resonance frequency of the fourth resonance, and the resonance frequency of the fourth resonance is smaller than the resonance frequency of the third resonance.
3. The antenna structure according to claim 1, characterized in that the frequency-selective network comprises a first inductance and a first capacitance;
a first end of the first inductor is connected with the first position, and a second end of the first inductor is connected with a first end of the first capacitor;
the second end of the first capacitor is grounded.
4. The antenna structure of claim 3, wherein the frequency selective network further comprises a second inductor connected in parallel with the first capacitor.
5. The antenna structure according to any of claims 1 to 4, characterized in that the antenna structure further comprises an antenna tuning circuit;
the first end of the antenna tuning circuit is connected with the second position of the first antenna radiator, the second end of the antenna tuning circuit is grounded, and the second position is located between the feed point and the grounded end of the first antenna radiator.
6. The antenna structure according to claim 5, characterized in that the antenna tuning circuit comprises an antenna switch or an adjustable capacitance.
7. The antenna structure of claim 5, wherein a length between the feed point and a first end of the first antenna radiator is less than a length between the feed point and a second end of the first antenna radiator, the first end of the first antenna radiator being an end of the first antenna radiator proximate to the slot, the second end of the first antenna radiator being an end of the first antenna radiator grounded.
8. An antenna structure according to any of claims 1 to 4, characterized in that the slot is filled with a non-conductive material.
9. The antenna structure according to any of claims 1 to 4, characterized in that the antenna structure is part of a metal middle frame of a communication terminal or part of a metal back cover of a communication terminal.
10. The antenna structure according to any of claims 1 to 4, characterized in that the resonance bandwidth of the antenna structure comprises 1710-2690 MHz frequency band, 3300-3800 MHz frequency band and 4400-5000 MHz frequency band.
11. A communication terminal, characterized in that it comprises an antenna structure according to any one of claims 1 to 10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811638282.2A CN109687111B (en) | 2018-12-29 | 2018-12-29 | Antenna structure and communication terminal |
| PCT/CN2019/124530 WO2020135046A1 (en) | 2018-12-29 | 2019-12-11 | Antenna structure and communication terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811638282.2A CN109687111B (en) | 2018-12-29 | 2018-12-29 | Antenna structure and communication terminal |
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| CN109687111A CN109687111A (en) | 2019-04-26 |
| CN109687111B true CN109687111B (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811638282.2A Active CN109687111B (en) | 2018-12-29 | 2018-12-29 | Antenna structure and communication terminal |
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| Country | Link |
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| CN (1) | CN109687111B (en) |
| WO (1) | WO2020135046A1 (en) |
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2018
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- 2019-12-11 WO PCT/CN2019/124530 patent/WO2020135046A1/en active Application Filing
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| Publication number | Publication date |
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| CN109687111A (en) | 2019-04-26 |
| WO2020135046A1 (en) | 2020-07-02 |
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