Antenna apparatus and mobile terminal
An antenna apparatus includes a radiator, a first grounding branch, and a second grounding branch. The radiator includes a feed point, a first radiation section, and a second radiation section. The first radiation section and the second radiation section are disposed on two sides of the feed point by a first gap and a second gap. A first ground end is disposed at one end of the first radiation section away from the first gap, and a second ground end is disposed at one end of the second radiation section away from the second gap. The first and second grounding branches intersect with the radiator. A matching circuit is coupled in series in the first grounding branch, and a first high-frequency filter is coupled in series in the second grounding branch.
1. An antenna apparatus comprising:
a first radiator comprising:
a feed point comprising:
a first side; and
a second side;
a first radiation section disposed on the first side and comprising a first end;
a second radiation section disposed on the second side and comprising a second end;
a first gap disposed between the first radiation section and the feed point, wherein the first end is located away from the first gap;
a second gap disposed between the second radiation section and the feed point, wherein the second end is located away from the second gap;
a first ground end disposed at the first end; and
a second ground end disposed at the second end;
a first grounding branch coupled to the first radiator and comprising:
a third ground end;
a first connection end located at a first intersection position between the first grounding branch and the first radiation section; and
a matching circuit coupled in series between the first connection end and the third ground end; and
a second grounding branch coupled to the first radiator and comprising:
a fourth ground end;
a second connection end located at a second intersection position between the second grounding branch and the second radiation section; and
a first high-frequency filter coupled in series between the second connection end and the fourth ground end.
2. The antenna apparatus of claim 1 , wherein when the matching circuit is in a closed-circuit state:
a second radiator between the first gap and the first connection end is configured to radiate a first low frequency band signal;
the matching circuit is configured to perform a frequency modulation on the first low frequency band signal; and
a third radiator between the second gap and the second ground end is configured to radiate a second low frequency band signal, and
wherein a fourth radiator between the first gap and the first ground end is configured to radiate a third low frequency band signal when the matching circuit is in an open-circuit state.
3. The antenna apparatus of claim 1 , wherein a fifth radiator is disposed between the second gap and the second connection end of the first radiator and is configured to radiate a first high frequency band signal, and wherein the first high-frequency filter is configured to allow the first high frequency band signal to pass through.
4. The antenna apparatus of claim 1 , wherein the first radiation section is configured to radiate a second high frequency band signal in a state when a current zero occurs on the first radiation section.
5. The antenna apparatus of claim 1 , further comprising a capacitor coupled in series between the feed point and a power supply side, wherein a capacitance value of the capacitor is within a preset range, and wherein a sixth radiator is disposed between the first connection end and the second ground end of the first radiator and is configured to radiate a third low frequency band signal when the matching circuit is in a closed-circuit state.
6. The antenna apparatus of claim 1 , further comprising a third grounding branch, wherein the third grounding branch comprises:
a fifth ground end;
a third connection end located at a third intersection position between the third grounding branch and the first radiation section; and
a second high-frequency filter coupled in series between the third connection end and the fifth ground end.
7. The antenna apparatus of claim 1 , further comprising:
a first lumped capacitor coupled in series between the feed point and the first radiation section in the first gap; and
a second lumped capacitor coupled in series between the feed point and the second radiation section in the second gap.
8. The antenna apparatus of claim 1 , further comprising:
a first variable capacitor coupled in series between the feed point and the first radiation section in the first gap; and
a second variable capacitor coupled in series between the feed point and the second radiation section in the second gap.
9. The antenna apparatus of claim 1 , further comprising:
a first antenna tuning switch coupled in series between the feed point and the first radiation section in the first gap; and
a second antenna tuning switch coupled in series between the feed point and the second radiation section in the second gap.
10. The antenna apparatus of claim 1 , further comprising:
a third grounding branch comprising:
a fifth ground end;
a third connection end located at a third intersection position between the third grounding branch and the first radiation section; and
a second high-frequency filter coupled in series between the third connection end and the fifth ground end; and
a second feed point disposed at a third end of the first radiation section proximate to the first gap,
wherein the first radiation section is configured to radiate a first frequency band signal,
wherein the second radiation section is configured to detect a specific absorption ratio (SAR) of a second frequency band signal,
wherein a second frequency band is higher than a first frequency band, and
wherein a difference between the second frequency band and the first frequency band is greater than a first preset threshold.
11. The antenna apparatus of claim 10 , wherein the second feed point comprises a Near-Field-Communication (NFC) feed point, and wherein the first frequency band signal comprises an NFC signal.
12. A mobile terminal comprising:
an antenna apparatus comprising:
a first radiator comprising:
a feed point comprising:
a first side; and
a second side;
a first radiation section disposed on the first side and comprising a first end;
a second radiation section disposed on the second side and comprising a second end;
a first gap disposed between the first radiation section and the feed point, wherein the first end is located away from the first gap;
a second gap disposed between the second radiation section and the feed point, wherein the second end is located away from the second gap;
a first ground end disposed at the first end; and
a second ground end disposed at the second end;
a first grounding branch coupled to the first radiator and comprising:
a third ground end;
a first connection end located at a first intersection position between the first grounding branch and the first radiation section; and
a matching circuit coupled in series between the first connection end and the third ground end; and
a second grounding branch coupled to the first radiator and comprising:
a fourth ground end;
a second connection end located at a second intersection position between the second grounding branch and the second radiation section; and
a first high-frequency filter coupled in series between the second connection end and the fourth ground end; and
a metal housing, wherein the first radiator is a portion of the metal housing or the first radiator is disposed inside the metal housing.
13. The mobile terminal of claim 12 , wherein when the matching circuit is in a closed-circuit state:
a second radiator between the first gap and the first connection end is configured to radiate a first low frequency band signal;
the matching circuit is configured to perform a frequency modulation on the first low frequency band signal; and
a third radiator between the second gap and the second ground end is configured to radiate a second low frequency band signal, and
wherein a fourth radiator between the first gap and the first ground end is configured to radiate a third low frequency band signal when the matching circuit is in an open-circuit state.
14. The mobile terminal of claim 12 , wherein a fifth radiator is disposed between the second gap and the second connection end of the first radiator and is configured to radiate a first high frequency band signal, and wherein the first-high frequency filter is configured to allow the first high frequency band signal to pass through.
15. The mobile terminal of claim 12 , wherein the first radiation section is configured to radiate a second high frequency band signal in a state when a current zero occurs on the first radiation section.
16. The mobile terminal of claim 12 , wherein the antenna apparatus further comprises a capacitor coupled in series between the feed point and a power supply side, wherein a capacitance value of the capacitor is within a preset range, and wherein a sixth radiator is disposed between the first connection end and the second ground end of the first radiator and is configured to radiate a third low frequency band signal when the matching circuit is in a closed-circuit state.
17. The mobile terminal of claim 12 , wherein the antenna apparatus further comprises a third grounding branch comprising:
a fifth ground end;
a third connection end located at a third intersection position between the third grounding branch and the first radiation section; and
a second high-frequency filter coupled in series between the third connection end and the fifth ground end.
18. The mobile terminal of claim 12 , wherein the antenna apparatus further comprises:
a first lumped capacitor coupled in series between the feed point and the first radiation section in the first gap; and
a second lumped capacitor coupled in series between the feed point and the second radiation section in the second gap.
19. The mobile terminal of claim 12 , wherein the antenna apparatus further comprises:
a third grounding branch comprising:
a fifth ground end;
a third connection end located at a third intersection position between the third grounding branch and the first radiation section; and
a second high-frequency filter coupled in series between the third connection end and the fifth ground end; and
a second feed point disposed at a third end of the first radiation section proximate to the first gap,
wherein the first radiation section is configured to radiate a first frequency band signal,
wherein the second radiation section is configured to detect a specific absorption ratio (SAR) of a second frequency band signal,
wherein a second frequency band is higher than a first frequency band, and
wherein a difference between the second frequency band and the first frequency band is greater than a first preset threshold.
20. The mobile terminal of claim 19 , wherein the second feed point comprises a Near-Field-Communication (NFC) feed point, and wherein the first frequency band signal comprises an NFC signal.