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EP-4738603-A1 - ANTENNA ASSEMBLY AND ELECTRONIC DEVICE

EP4738603A1EP 4738603 A1EP4738603 A1EP 4738603A1EP-4738603-A1

Abstract

The disclosure provides an antenna assembly and an electronic device. The antenna assembly includes a first radiator and a first feed source. The first radiator includes a first ground terminal, a first feeding point, and a first free terminal arranged in sequence. The first feed source is configured to generate first and second radio frequency signals, and is electrically connected to the first feeding point. When the antenna assembly is in a free state, the first radio frequency signal is adapted to excite the first radiator to support a first frequency band, and the second radio frequency signal is adapted to excite the first radiator to support a second frequency band, frequencies of the second frequency band being lower than frequencies of the first frequency band. When the electronic device to which the antenna assembly is applied is covered with a metal protective case, the second radio frequency signal excites the first radiator to support at least part of the first frequency band. The electronic device to which the antenna assembly provided in the disclosure is applied still has good antenna performance in the first frequency band when covered with a metal protective case.

Inventors

  • ZENG, Zhimin
  • PAN, JIN
  • TANG, Haijun

Assignees

  • GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.

Dates

Publication Date
20260506
Application Date
20251103

Claims (15)

  1. An antenna assembly (10), comprising: a first radiator (110) comprising a first ground terminal (111), a first feeding point (P1), and a first free terminal (112) arranged in sequence; and a first feed source (S1), configured to generate a first radio frequency signal and a second radio frequency signal, and the first feed source (S1) being electrically connected with the first feeding point (P1); wherein when the antenna assembly (10) is in a free state, the first radio frequency signal is adapted to excite the first radiator (110) to support a first frequency band, and the second radio frequency signal is adapted to excite the first radiator (110) to support a second frequency band, frequencies of the second frequency band being lower than frequencies of the first frequency band; and when an electronic device (1) to which the antenna assembly (10) is applied is covered with a metal protective case, the second radio frequency signal is adapted to excite the first radiator (110) to support at least part of the first frequency band.
  2. The antenna assembly (10) of claim 1, wherein the first radio frequency signal is adapted to excite a first resonance mode of the first radiator (110) to support the first frequency band, and the first resonance mode is a quarter-wavelength mode of the first radiator (110); and the second radio frequency signal is adapted to excite a second resonance mode of the first radiator (110), and the second resonance mode is a composite right/left-handed mode of the first radiator (110).
  3. The antenna assembly (10) of any one of claims 1-2, wherein the first radiator (110) further comprises a second feeding point (P2), the second feeding point (P2) is spaced apart from the first feeding point (P1), and the second feeding point (P2) is closer to the first free terminal (112) than the first feeding point (P1); the antenna assembly (10) further comprises a second feed source (S2), the second feed source (S2) is configured to generate a third radio frequency signal and a fourth radio frequency signal, and the second feed source (S2) is electrically connected with the second feeding point (P2); when the antenna assembly (10) is in the free state, the third radio frequency signal is adapted to excite the first radiator (110) to support a third frequency band, and the fourth radio frequency signal is adapted to excite the first radiator (110) to support a fourth frequency band, frequencies of the third frequency band being higher than the frequencies of the first frequency band, and frequencies of the fourth frequency band being higher than the frequencies of the third frequency band.
  4. The antenna assembly (10) of claim 3, further comprising: a first band-pass circuit (130), wherein one terminal of the first band-pass circuit (130) is electrically connected to the first feeding point (P1), another terminal of the first band-pass circuit (130) is grounded, and the first band-pass circuit (130) is a band-pass circuit for the third frequency band; wherein the first band-pass circuit (130) comprises: a first capacitor (C1), one terminal of the first capacitor (C1) being electrically connected to the first feeding point (P1); and a first inductor (L1), one terminal of the first inductor (L1) being electrically connected to another terminal of the first capacitor (C1), and another terminal of the first inductor (L1) being grounded.
  5. The antenna assembly (10) of claim 4, wherein the second feed source (S2) is configured to excite a third resonance mode and a first enhancement mode of the first radiator (110) to support the third frequency band; wherein a resonance current (I13) of the third resonance mode is distributed between the first feeding point (P1) and the first free terminal (112); and a resonance current (I21) of the first enhancement mode is distributed between the first ground terminal (111) and the first feeding point (P1), and a direction of the resonance current (I21) of the first enhancement mode is the same as a direction of the resonance current (I13) of the third resonance mode.
  6. The antenna assembly (10) of any one of claims 3-5, further comprising: a second band-pass circuit (140), wherein one terminal of the second band-pass circuit (140) is electrically connected to the first feeding point (P1), another terminal of the second band-pass circuit (140) is grounded, and the second band-pass circuit (140) is a band-pass circuit for the fourth frequency band; wherein the second band-pass circuit (140) comprises: a second capacitor (C2), one terminal of the second capacitor (C2) being electrically connected to the first feeding point (P1); a second inductor (L2) connected in parallel with the second capacitor (C2); and a third inductor (L3), one terminal of the third inductor (L3) being electrically connected to another terminal of the second capacitor (C2), and another terminal of the third inductor (L3) being grounded.
  7. The antenna assembly (10) of any one of claims 1-6, further comprising: a first impedance matching circuit (150), wherein the first feed source (S1) is electrically connected with the first feeding point (P1) through the first impedance matching circuit (150), and the first impedance matching circuit (150) is configured to perform impedance matching between the first feed source (S1) and the first radiator (110); wherein the first impedance matching circuit (150) comprises: a third capacitor (C3), one terminal of the third capacitor (C3) being electrically connected to the first feed source (S1); a fourth capacitor (C4), one terminal of the fourth capacitor (C4) being electrically connected to another terminal of the third capacitor (C3); a fourth inductor (L4), one terminal of the fourth inductor (L4) being electrically connected to another terminal of the fourth capacitor (C4), and another terminal of the fourth inductor (L4) being electrically connected to the first feeding point (P1); a fifth capacitor (C5), one terminal of the fifth capacitor (C5) being electrically connected to the one terminal of the fourth inductor (L4), and another terminal of the fifth capacitor (C5) being grounded; and a fifth inductor (L5), one terminal of the fifth inductor (L5) is electrically connected to the one terminal of the fourth inductor (L4), and another terminal of the fifth inductor (L5) being grounded.
  8. The antenna assembly (10) of any of claims 3-6, wherein the second feed source (S2) is configured to excite a fourth resonance mode of the first radiator (110) to support the fourth frequency band; wherein a current (I14) of the fourth resonance mode is distributed between the second feeding point (P2) and the first free terminal (112).
  9. The antenna assembly (10) of any of claims 3-8, further comprising: a band-stop circuit (160), wherein the second feed source (S2) is electrically connected with the second feeding point (P2) through the band-stop circuit (160), and the band-stop circuit (160) is a band-stop circuit (160) for the first frequency band; wherein the band-stop circuit (160) comprises: a sixth inductor (L6), one terminal of the sixth inductor (L6) being electrically connected with the second feed source (S2), and another terminal of the sixth inductor (L6) being electrically connected to the second feeding point (P2); and a sixth capacitor (C6) connected in parallel with the sixth inductor (L6).
  10. The antenna assembly (10) of claim 9, further comprising: a second impedance matching circuit (170), wherein the second feed source (S2) is electrically connected with the second feeding point (P2) through the second impedance matching circuit (170) and the band-stop circuit (160) in sequence, and the second impedance matching circuit (170) is configured to perform impedance matching between the second feed source (S2) and the first radiator (110); wherein the second impedance matching circuit (170) comprises: a seventh capacitor (C7), one terminal of the seventh capacitor (C7) being electrically connected to the second feed source (S2); an eighth capacitor (C8), one terminal of the eighth capacitor (C8) being electrically connected to another terminal of the seventh capacitor (C7); a seventh inductor (L7), one terminal of the seventh inductor (L7) being electrically connected to another terminal of the eighth capacitor (C8), and another terminal of the seventh inductor (L7) being electrically connected to the band-stop circuit (160); and an eighth inductor (L8), one terminal of the eighth inductor (L8) being electrically connected to the another terminal of the seventh inductor (L7), and another terminal of the eighth inductor (L8) being grounded.
  11. The antenna assembly (10) of any one of claims 1-10, further comprising: a second radiator (120) comprising a second free terminal (121), a third feeding point (P3), and a second ground terminal (122) arranged in sequence, wherein the second free terminal (121) is opposite to the first free terminal (112), the second free terminal (121) is spaced apart from the first free terminal (112) by a coupling gap (110a), and the second radiator (120) is coupled with the first radiator (110) through the coupling gap (110a); and a third feed source (S3), configured to generate a fifth radio frequency signal, wherein the third feed source (S3) is electrically connected with the third feeding point (P3); when the antenna assembly (10) is in the free state, the fifth radio frequency signal is adapted to excite the second radiator (120) to support a fifth frequency band, frequencies of the fifth frequency band being higher than the frequencies of the first frequency band; and when the electronic device (1) to which the antenna assembly (10) is applied is covered with the metal protective case, the fifth radio frequency signal is adapted to excite the second radiator (120) to support at least part of the first frequency band.
  12. The antenna assembly (10) of claim 11, wherein the first feed source (S1) is further configured to excite a second enhancement mode of the second radiator (120) to support the first frequency band, a resonance current (I22) of the second enhancement mode is distributed between the second free terminal (121) and the second ground terminal (122); and when the first resonance mode supports the first frequency band and a first resonance current (I11) of the first resonance mode flows from the first ground terminal (111) to the first free terminal (112), a second enhancement current (I22) of the second enhancement mode is adapted to flow from the second free terminal (121) to the second ground terminal (122); wherein when the first radiator (110) comprises the second feeding point (P2) and the antenna assembly (10) further comprises the second feed source (S2), the second feed source (S2) is further configured to excite a third enhancement mode of the second radiator (120) to support the third frequency band; when the third resonance mode of the first radiator (110) is excited by the second feed source (S2) to support the third frequency band, a resonance current (I23) of the third enhancement mode is distributed between the second free terminal (121) and the second ground terminal (122), and a direction of the resonance current (I23) of the third enhancement mode is the same as a direction of the resonance current (I13) of the third resonance mode.
  13. The antenna assembly (10) of any one of claims 11-12, further comprising: an aperture tuning circuit (180), wherein one terminal of the aperture tuning circuit (180) is electrically connected to the third feeding point (P3), and another terminal of the aperture tuning circuit (180) is grounded; the aperture tuning circuit (180) is configured to perform aperture tuning of the fifth frequency band so that the frequencies of the fifth frequency band are higher than the frequencies of the first frequency band; wherein the aperture tuning circuit (180) comprises: a tuning inductor (L0), one terminal of the tuning inductor (L0) being electrically connected to the third feeding point (P3); and an isolation capacitor (C0), one terminal of the isolation capacitor (C0) being electrically connected to another terminal of the tuning inductor (L0), and another terminal of the isolation capacitor (C0) being grounded.
  14. The antenna assembly (10) of any one of claim 11-13, further comprising: a third band-pass circuit (210), wherein one terminal of the third band-pass circuit (210) is connected to the third feeding point (P3), another terminal of the third band-pass circuit (210) is grounded, and the third band-pass circuit (210) is a band-pass circuit for the third frequency band; wherein the third band-pass circuit (210) comprises: a ninth inductor (L9), one terminal of the ninth inductor (L9) being connected to the third feeding point (P3); and a ninth capacitor (C9), one terminal of the ninth capacitor (C9) being connected to another terminal of the ninth inductor (L9), and another terminal of the ninth capacitor (C9) being grounded; wherein the antenna assembly (10) further comprises: a third impedance matching circuit (190), wherein the third feed source (S3) is electrically connected with the third feeding point (P3) through the third impedance matching circuit (190), and the third impedance matching circuit (190) is configured to perform impedance matching between the third feed source (S3) and the second radiator (120); wherein the third impedance matching circuit (190) comprises: a tenth inductor (L10), one terminal of the tenth inductor (L10) being electrically connected to the third feed source (S3), and another terminal of the tenth inductor (L10) being electrically connected to the third feeding point (P3); and a tenth capacitor (C10), one terminal of the tenth capacitor (C10) being electrically connected to the third feeding point (P3), and another terminal of the tenth capacitor (C10) being grounded.
  15. An electronic device (1), comprising the antenna assembly (10) of any one of claims 1-14.

Description

TECHNICAL FIELD The disclosure relates to the field of communication technologies, and particularly to an antenna assembly and an electronic device. BACKGROUND With the development of technology, electronic devices with communication functions such as mobile phones have become increasingly popular and have more and more powerful functions. Such an electronic device usually includes an antenna assembly to realize the communication function of the electronic device. However, in the related art, when the electronic device is covered with a metal protective case, the performance of the antenna assembly in a target frequency band (such as a GPS L1 frequency band) is greatly attenuated, resulting in poor antenna performance in the target frequency band. SUMMARY Embodiments of the disclosure provide an antenna assembly and an electronic device. The invention is set out in the appended set of claims. In conclusion, in the antenna assembly provided by the embodiments of the disclosure, the first feed source is configured to generate a first radio frequency signal and a second radio frequency signal, and the first feed source is electrically connected with the first feeding point of the first radiator. Therefore, the first radio frequency signal and the second radio frequency signal all excite the same first radiator, so that the first radiator supports the first frequency band and the second frequency band. Compared with a case where the antenna assembly is in a free state, when an electronic device to which the antenna assembly is applied is covered with a metal protective case, due to the influence of the metal protective case, a frequency band supported by the first radiator under excitation of the second radio frequency signal is shifted relative to the second frequency band. When the electronic device to which the antenna assembly is applied is covered with the metal protective case, the frequency band supported by the first radiator under excitation of the second radio frequency signal is shifted towards a frequency higher than the second frequency band, so that at least part of the frequency band supported by the first radiator under excitation of the second radio frequency signal falls within the range of the first frequency band. Therefore, when the electronic device to which the antenna assembly is applied is covered with a metal protective case, the second radio frequency signal excites the first radiator to support at least part of the first frequency band. In this way, when the electronic device to which the antenna assembly is applied is covered with a metal protective case, the antenna assembly still has a large bandwidth in the first frequency band, and the electronic device to which the antenna assembly is applied still has good antenna performance in the first frequency band when covered with the metal protective case. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate technical solutions of the embodiments of the disclosure, drawings needed in the embodiments will be briefly introduced below. Apparently, the drawings in the following description are only some embodiments of the disclosure. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative work. FIG. 1 schematically illustrates an antenna assembly provided by an embodiment of the disclosure.FIG. 2 schematically illustrates a resonance current of a first resonance mode of the antenna assembly shown in FIG. 1.FIG. 3 schematically illustrates a resonance current of a second resonance mode of the antenna assembly shown in FIG. 1.FIG. 4 schematically illustrates an antenna assembly provided by another embodiment of the disclosure.FIG. 5 schematically illustrates an antenna assembly provided by yet another embodiment of the disclosure.FIG. 6 schematically illustrates a resonance current generated when the antenna assembly shown in FIG. 5 supports a third frequency band.FIG. 7 schematically illustrates a resonance current generated when the antenna assembly shown in FIG. 5 supports a fourth frequency band.FIG. 8 schematically illustrates a first band-pass circuit of the antenna assembly shown in FIG. 5.FIG. 9 schematically illustrates an antenna assembly provided by still another embodiment of the disclosure.FIG. 10 schematically illustrates a second band-pass circuit shown in FIG. 9.FIG. 11 schematically illustrates an antenna assembly provided by a further embodiment of the disclosure.FIG. 12 schematically illustrates a first impedance matching circuit of the antenna assembly shown in FIG. 11.FIG. 13 schematically illustrates an antenna assembly provided by yet a further embodiment of the disclosure.FIG. 14 is a circuit diagram of partial structure of the antenna assembly shown in FIG. 13.FIG. 15 schematically illustrates an antenna assembly provided by yet a still further embodiment of the disclosure.FIG. 16 schematically illustrates resonance currents of a first reson