Source: https://patents.google.com/patent/US10224605B2/en
Timestamp: 2020-04-09 12:09:10
Document Index: 106255236

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US10224605B2 - Antenna and mobile terminal - Google Patents
Antenna and mobile terminal Download PDF
US10224605B2
US10224605B2 US15/025,714 US201415025714A US10224605B2 US 10224605 B2 US10224605 B2 US 10224605B2 US 201415025714 A US201415025714 A US 201415025714A US 10224605 B2 US10224605 B2 US 10224605B2
US15/025,714
US20160248146A1 (en
2014-03-28 Application filed by Huawei Device Dongguan Co Ltd filed Critical Huawei Device Dongguan Co Ltd
2014-03-28 Priority to PCT/CN2014/074299 priority Critical patent/WO2015143714A1/en
2016-05-17 Assigned to HUAWEI DEVICE CO., LTD. reassignment HUAWEI DEVICE CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WANG, HANYANG, LI, JIANMING
2016-08-25 Publication of US20160248146A1 publication Critical patent/US20160248146A1/en
2019-03-05 Publication of US10224605B2 publication Critical patent/US10224605B2/en
239000003990 capacitor Substances 0 claims abstract description 86
Referring to FIG. 1, an antenna 100 provided in a first implementation manner of the present disclosure includes a first radiation part 30, a matching circuit 20, and a feed source 40, where the first radiation part 30 includes a first radiator 34, a second radiator 32, and a capacitor structure (the capacitor structure is not denoted in FIG. 1, and for a capacitor structure, refer to 36 a in FIG. 4 and 36 c in FIG. 6) located between the first radiator 34 and the second radiator 32. A first end of the first radiator 34 is connected to the feed source 40 using the matching circuit 20, the feed source 40 is connected to a grounding part 10, a second end of the first radiator 34 is connected to a first end of the second radiator 32 using the capacitor structure, and a second end of the second radiator 32 is connected to the grounding part 10, where the first radiation part 30 is configured to generate a first resonance frequency, and a length of the second radiator 32 is one-eighth of a wavelength corresponding to the first resonance frequency. The first resonance frequency may be corresponding to f1 in FIG. 3 and FIG. 7.
In another implementation manner of the present disclosure, as shown in FIG. 4, the capacitor structure 36 a may be a capacitor (the capacitor may be an independent electronic element), and that a second end of the first radiator 34 is connected to a first end of the second radiator 32 using the capacitor structure 36 a is further connected the second end of the first radiator 34 to the first end of the second radiator 32 using the capacitor.
Referring to FIG. 4, FIG. 4 shows an antenna 100 a according to a second implementation manner of the present disclosure. The antenna 100 a provided in the second implementation manner and the antenna 100 (referring to FIG. 1) provided in the first implementation manner are basically the same in terms of a structure, and implement similar functions. The antenna 100 a differs from the antenna 100 in that a capacitor structure 36 a is connected between a second end of a first radiator 34 a and a first end of a second radiator 32 a. In an optional implementation manner, the capacitor structure 36 a may be a multilayer capacitor or a distributed capacitor. In another implementation manner, the capacitor structure 36 a may be a variable capacitor or a capacitor that is connected in series or in parallel in multiple forms. The capacitor structure 36 a may be a variable capacitor, and therefore, a value of variable capacitance may be changed according to an actual requirement such that a low-frequency resonance frequency of the antenna 100 in the present disclosure can be changed by adjusting the value of the variable capacitance, thereby improving convenience in use.
Referring to FIG. 5, FIG. 5 shows an antenna 100 b according to a third implementation manner of the present disclosure. The antenna 100 b provided in the third implementation manner and the antenna 100 (referring to FIG. 1) provided in the first implementation manner are basically the same in terms of a structure, and implement similar functions. The antenna 100 b differs from the antenna 100 in that a capacitor structure 36 b includes a first branch structure 35 b and a second branch structure 37 b, where the first branch structure 35 b includes at least one pair of mutually paralleled first branches 350 b, the second branch structure 37 b includes at least one second branch 370 b, the first branches 350 b are spaced, and the second branch 370 b is located between the first branches 350 b and is spaced from the first branches 350 b. In other words, the capacitor structure 36 b is collectively formed by the first branches 350 b and the second branch 370 b.
As shown in FIG. 5, in an optional implementation manner, there are two first branches 350 b that are parallel to each other, the two adjacent first branches 350 b are spaced, there are three second branches 370 b that are parallel to each other, and one of the first branches 350 b is located between two adjacent second branches 370 b.
In another implementation manner, there may be four or more first branches 350 b, every two adjacent first branches 350 b are spaced and parallel to each other. In addition, there may be three or more second branches 370 b, each first branch 350 b is located between two adjacent second branches 370 b. A general principle is that every two adjacent second branches 370 b are spaced and parallel to each other, each first branch 350 b is located between two adjacent second branches 370 b, and meanwhile, the second branches 370 b outnumber the first branches 350 b by one. Certainly, the foregoing principle may be reversed, that is, the first branches 350 b outnumber the second branches 370 b by one, every two adjacent first branches 350 b are spaced and parallel to each other, and each second branch 370 b is located between two adjacent first branches 350 b.
Referring to FIG. 6, FIG. 6 shows an antenna 100 c according to a fourth implementation manner of the present disclosure. The antenna 100 c provided in the fourth implementation manner and the antenna 100 b (referring to FIG. 5) provided in the third implementation manner are basically the same in terms of a structure, and implement similar functions. The antenna 100 c differs from the antenna 100 b in that the antenna 100 c further includes a second radiation part 39 c, a first end of the second radiation part 39 c is connected to a second end of a first radiator 34 c, and the second radiation part 39 c and a capacitor structure 36 c generate a first high-frequency resonance frequency. As shown in FIG. 7, the first high-frequency resonance frequency may be corresponding to f6 in FIG. 7.
As a further improvement of the present disclosure, the antenna 100 c further includes at least one third radiation part 38 c, a first end of the third radiation part 38 c is connected to a first end of a second radiator 32 c, and the third radiation part 38 c and the capacitor generate a second high-frequency resonance frequency, where the second high-frequency resonance frequency may be corresponding to f4 or f5 in FIG. 7. The antenna 100 c in this implementation manner includes two third radiation parts 38 c, and the two third radiation parts 38 c generate two second high-frequency resonance frequencies, which are respectively corresponding to f4 and f5 in FIG. 7. One third radiation part 38 c is located between the other third radiation part 38 c and the second radiation part 39 c, that is, one third radiation part 38 c is close to the second radiation part 39 c, and the other third radiation part 38 c is away from the second radiation part 39 c, where the third radiation part 38 c close to the second radiation part 39 c may be corresponding to the second high-frequency resonance frequency f5, and the third radiation part 38 c away from the second radiation part 39 c may be corresponding to the second high-frequency resonance frequency f4.
It may be understood that in this embodiment, the third radiation part 38 c away from the second radiation part 39 c is corresponding to the second high-frequency resonance frequency f4, the third radiation part 38 c close to the second radiation part 39 c is corresponding to the second high-frequency resonance frequency f5, and the second radiation part 39 c is corresponding to the first high-frequency resonance frequency f6. Optionally, f4 may be corresponding to the third radiation part 38 c close to the second radiation part 39 c or may be corresponding to the second radiation part 39 c, f5 may be corresponding to the third radiation part 38 c away from the second radiation part 39 c and may be corresponding to the second radiation part 39 c, and f6 may be corresponding to the third radiation part 38 c away from the second radiation part 39 c or the third radiation part 38 c close to the second radiation part 39 c. Furthermore, how f4 to f6 are corresponding to the third radiation part 38 c away from the second radiation part 39 c, the third radiation part 38 c close to the second radiation part 39 c, and the second radiation part 39 c may be determined according to lengths of the third radiation part 38 c away from the second radiation part 39 c, the third radiation part 38 c close to the second radiation part 39 c, and the second radiation part 39 c, and a longer length is corresponding to a lower frequency. For example, if a length of the third radiation part 38 c close to the second radiation part 39 c is greater than that of the second radiation part 39 c, and the length of the second radiation part 39 c is greater than a length of the third radiation part 38 c away from the second radiation part 39 c, the third radiation part 38 c close to the second radiation part 39 c is corresponding to f4, the second radiation part 39 c is corresponding to f5, and the length of the third radiation part 38 c away from the second radiation part 39 c is corresponding to f6.
Optionally, each third radiation part 38 c is in a shape of “
”, the two third radiation parts 38 c form two parallel branches, the two third radiation parts have one common endpoint, and the common endpoint is connected to the first end of the second radiator 32 c.
As a further improvement of this embodiment of the present disclosure, one end of a fourth radiation part 37 c is connected to the first end of the second radiator 32 c, and the other end of the fourth radiation part 37 c is in an open state.
Optionally, the fourth radiation part 37 c and the second radiator 32 c may be located on a same side of the capacitor structure 36 c.
The fourth radiation part 37 c and the capacitor structure 36 c generate a low-frequency resonance frequency and a high-order resonance frequency, where the low-frequency resonance frequency may be corresponding to f2 in FIG. 7, and the high-order resonance frequency is corresponding to f3 in FIG. 7.
Optionally, the fourth radiation part 37 c is in a shape of “
In an optional implementation manner, the fourth radiation part 37 c is opposite to one of the third radiation parts 38 c (for example, the third radiation part 38 c away from the second radiation part 39 c), and an open end of the fourth radiation part 37 c is opposite to and not in contact with an open end of one of the third radiation parts 38 c, to form a coupled structure. It may be understood that the open end of the fourth radiation part 37 c is opposite to and not in contact with the open end of one of the third radiation parts 38 c, and no coupled structure may be formed.
In another implementation manner, in addition to the first radiator 34 and the second radiator 32, the antenna 100 in the fourth implementation manner may further include only the second radiation part 39 c or/and at least one third radiation part 38 c or/and the fourth radiation part 37 c, that is, any combination of the second radiation part 39 c, the third radiation part 38 c, and the fourth radiation part 37 c. Quantities of second radiation parts 39 c, third radiation parts 38 c, and fourth radiation parts 37 c may also be increased or decreased according to an actual requirement.
The antenna 100 can generate multiple resonance frequencies shown in FIG. 7, where f1 is a low-frequency resonance frequency generated by the second radiator 32 c and the low-frequency resonance frequency is a first resonance frequency, f2 is a low-frequency resonance frequency generated by the fourth radiation part 37 c, f3 is a high-order resonance frequency generated by the fourth radiation part 37 c, f4 and f5 are second high-frequency resonance frequencies generated by the two third radiation parts 38 c, and f6 is a first high-frequency resonance frequency generated by the second radiation part 39 c such that the antenna 100 in this embodiment of the present disclosure is a broadband antenna 100 that can cover a high frequency band and a low frequency band.
FIG. 8 is a frequency-standing wave ratio diagram (frequency response diagram) of the antenna 100 c shown in FIG. 6, where a horizontal coordinate represents a frequency in the unit of GHz, and a vertical coordinate represents a standing wave ratio in the unit of decibel (dB). It may be found from FIG. 8 that the antenna 100 may excite low-frequency double resonance, and the low-frequency double resonance and multiple high-frequency resonance generate broadband coverage.
FIG. 9 is a radiation efficiency diagram of the antenna 100 shown in FIG. 6, where a horizontal coordinate represents a frequency, and a vertical coordinate represents a gain. It may be found from FIG. 9 that radiation efficiency of the antenna 100 c is higher.
In conclusion, the antenna 100 c in the present disclosure can generate a low-frequency resonance frequency and a high-frequency resonance frequency, where the low-frequency frequency may cover a frequency band of 800 MHz-920 MHz, and the high-frequency frequency may cover a frequency band of 1800 MHz-2650 MHz. By adjusting a distributed inductor and a series capacitor, the resonance frequencies can cover a frequency band required in a current 2G/3G/4G communications system.
In addition, because the second end of the first radiator 34 c is electrically connected to the first end of the second radiator 32 c using the capacitor structure 36 c, the antenna 100 c can generate different resonance frequencies by adjusting a position of the capacitor structure 36 cbetween the second end of the first radiator 34 c and the first end of the second radiator 32 c. Furthermore, a value of the capacitor structure may be determined according to areas of metal plates, a distance between two parallel metal plates, and a dielectric constant of a medium between the two parallel metal plates, where a calculation formula is C=er×A/d, where C is a capacitance value, er is the dielectric constant of the medium between the two parallel metal plates, A is a cross-sectional area of the two parallel metal plates, and d is the distance between the two parallel metal plates. Therefore, the capacitance value is adjusted by adjusting values of er, A, and d.
The antenna in the mobile terminal may be any antenna in the foregoing antenna embodiments. The baseband processing unit may be connected to the circuit board. As shown in FIG. 10, in an implementation manner, a first radiation part 30 of the antenna 100 may be located on an antenna bracket 200. The antenna bracket 200 may be an insulation medium, disposed on one side of the circuit board 300, and disposed in parallel with the circuit board 300, or may be fastened to the circuit board 300. Optionally, the first radiation part 30 of the antenna may also be suspended in the air (as shown in FIG. 11), where a second radiation part 39 c, a third radiation part 38 c, and a fourth radiation part 37 c may also be located on the antenna bracket 200, and certainly, the second radiation part 39 c, the third radiation part 38 c, and the fourth radiation part 37 c may also be suspended in the air.
wherein the first radiation part comprises:
a second radiator; and
a capacitor structure,
wherein the first radiation part is configured to generate a first frequency,
wherein the first end of the second radiator and the second end of the second radiator are utilized to form a parallel-distributed inductor in a composite right/left-handed transmission line configuration, and
wherein the capacitor structure is a series-distributed capacitor structure in the composite right/left-handed transmission line configuration.
2. The antenna according to claim 1, wherein the first radiator and the second radiator are metal sheets, wherein the first radiator and the second radiator are formed on a bracket, and wherein the bracket is an insulation medium.
3. The antenna according to claim 1, wherein the capacitor structure is a capacitor.
4. The antenna according to claim 1, wherein the first radiator and the second radiator are microstrips disposed on a circuit board, and wherein the first radiator part, the matching circuit and the grounding part are disposed on a same plane of the circuit board.
5. The antenna according to claim 1, further comprising a second radiation part, wherein a first end of the second radiation part is connected to the second end of the first radiator, and wherein the second radiation part and the capacitor structure are configured to generate a first high-frequency resonance frequency.
6. The antenna according to claim 1, wherein the first frequency is a low-frequency resonance frequency.
7. The antenna according to claim 6, wherein the low-frequency resonance frequency is 800 megahertz (MHz).
8. The antenna according to claim 1, wherein the antenna comprises a composite right and left hand antenna.
a radio frequency processor, and
wherein the antenna is configured to:
transmit a received radio signal to the radio frequency processor; or
convert a transmit signal of the radio frequency processor into an electromagnetic wave, and transmit the electromagnetic wave,
wherein the radio frequency processor is configured to:
perform frequency selection, amplification, and down-conversion processing on the radio signal received by the antenna, convert the radio signal into an intermediate frequency signal or a baseband signal, and transmit the intermediate frequency signal or the baseband signal to the baseband processor; or
transmit, using the antenna, the baseband signal or the intermediate frequency signal that is sent by the baseband processor and that is obtained by means of up-conversion and amplification,
wherein the baseband processor is configured to perform processing on the received intermediate frequency signal or the received baseband signal,
10. The mobile terminal according to claim 9, wherein the first radiator and the second radiator are metal sheets, wherein the first radiator and the second radiator are formed on a bracket, and wherein the bracket is an insulation medium.
11. The mobile terminal according to claim 9, wherein the capacitor structure is a capacitor.
12. The mobile terminal according to claim 9, wherein the first radiator and the second radiator are microstrips disposed on a circuit board, and wherein the first radiator part, the matching circuit and the grounding part are disposed on a same plane of the circuit board.
13. The mobile terminal according to claim 9, wherein the antenna further comprises a second radiation part, wherein a first end of the second radiation part is connected to the second end of the first radiator, and wherein the second radiation part and the capacitor structure generate a first high-frequency resonance frequency.
14. The mobile terminal according to claim 9, wherein the first frequency is a low-frequency resonance frequency.
15. The mobile terminal according to claim 14, wherein the low-frequency resonance frequency is 800 megahertz (MHz).
16. The mobile terminal according to claim 9, wherein the first radiation part is located on an antenna bracket.
17. The mobile terminal according to claim 9, wherein the antenna comprises a composite right and left hand antenna.
US15/025,714 2014-03-28 2014-03-28 Antenna and mobile terminal Active 2034-06-10 US10224605B2 (en)
PCT/CN2014/074299 WO2015143714A1 (en) 2014-03-28 2014-03-28 Antenna and mobile terminal
PCT/CN2014/074299 A-371-Of-International WO2015143714A1 (en) 2014-03-28 2014-03-28 Antenna and mobile terminal
US16/057,374 Continuation US10320060B2 (en) 2014-03-28 2018-08-07 Antenna and mobile terminal
US20160248146A1 US20160248146A1 (en) 2016-08-25
US10224605B2 true US10224605B2 (en) 2019-03-05
ID=52612512
US15/025,714 Active 2034-06-10 US10224605B2 (en) 2014-03-28 2014-03-28 Antenna and mobile terminal
US16/057,374 Active US10320060B2 (en) 2014-03-28 2018-08-07 Antenna and mobile terminal
US (2) US10224605B2 (en)
EP (2) EP3474375A1 (en)
CN (2) CN104396086B (en)
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WANG, HANYANG;LI, JIANMING;SIGNING DATES FROM 20160309 TO 20160310;REEL/FRAME:038615/0685