Antenna structure
An antenna structure includes a housing, a first feed source, and a second feed source. The first feed source is electrically coupled to a first radiating portion of the housing and adapted to provide an electric current to the first radiating portion. The second feed source is electrically coupled to one of a second radiating portion or a third radiating portion of the housing. The other one of the second radiating portion or the third radiating portion is electrically coupled to the first radiating portion.
1. An antenna structure comprising:
a housing comprising a middle frame and a border frame, wherein the middle frame and the border frame are made of metal, the border frame is mounted around a periphery of the middle frame, the border frame comprises a slot, a first gap, and a second gap, the slot is in an inner side of the border frame, a width of a first portion of the border frame defining the slot is less than a width of a second portion of the border frame not defining the slot, the first gap and the second gap are in the border frame, the slot, the first gap, and the second gap divide the border frame into a first radiating portion, a second radiating portion, and a third radiating portion, the first radiating portion is insulated from the middle frame by the slot;
a first feed source electrically coupled to the first radiating portion and adapted to provide an electric current to the first radiating portion;
a second feed source electrically coupled to one of the second radiating portion and the third radiating portion, another one of the second radiating portion and the third radiating portion being electrically coupled to the first radiating portion; and
two extending portions, wherein the two extending portions face to each other, the two extending portions are electrically coupled to two radiating portions adjacent to one of the first gap and the second gap; wherein:
a thickness of the border frame is greater than or equal to twice a width of the first gap or twice a width of the second gap; and
a width of the slot is less than or equal to half the width of the first gap or half the width of the second gap.
2. The antenna structure of claim 1 , wherein:
the border frame comprises an end portion, a first side portion, and a second side portion;
the first side portion and the second side portion are respectively coupled to opposite ends of the end portion;
the first gap is in the end portion adjacent the first side portion, and the second gap is in the end portion adjacent the second side portion;
the slot is in an inner side of the end portion and extends toward the first side portion and the second side portion;
the first radiating portion is defined in a portion of the border frame between the first gap and the second gap;
the second radiating portion is defined in a portion of the border frame between the first gap and an endpoint of the first side portion;
the third radiating portion is defined in a portion of the border frame between the second gap and an endpoint of the second side portion.
3. The antenna structure of claim 2 , wherein:
a portion of the border frame between the first feed source and the first gap defines a first radiating section;
a portion of the border frame between the first feed source and the second gap defines a second radiating section;
the second feed source is electrically coupled to the second radiating portion;
when the first feed source supplies the electric current, the electric current from the first feed source flows through the first radiating section to excite a first resonant mode and generate a radiating signal in a first frequency band;
the electric current from the first feed source flows through the second radiating section and is electrically coupled to the third radiating portion through the second gap to excite a second resonant mode and generate a radiation signal in a second frequency band;
when the second feed source supplies the electric current, the electric current from the second feed source flows through the second radiating portion to excite a third resonant mode and generate a radiation signal in a third frequency band.
4. The antenna structure of claim 3 , wherein:
the first resonant mode is a Long Term Evolution Advanced (LTE-A) low-frequency mode;
the second resonant mode is an LTE-A mid-frequency mode;
the third resonant mode is an LTE-A high-frequency mode.
5. The antenna structure of claim 3 , wherein:
one of the two extending portions is electrically coupled to an end of the second radiating section adjacent to the second gap; and
a second one of the two extending portions is electrically coupled to an end of the third radiating portion adjacent to the second gap.
6. The antenna structure of claim 3 , wherein:
the second feed source is electrically coupled to the third radiating portion;
when the first feed source supplies the electric current, the electric current from the first feed source flows through the first radiating portion to excite a first resonant mode and generate a radiation signal in a first frequency band;
the electric current from the first feed source flows through the first radiating portion and is electrically coupled to the second radiating portion through the first gap to excite a second resonant mode and generate a radiation signal in a second frequency band;
the electric current from the first feed source flows through the third radiating portion to excite a third resonant mode and generate a radiation signal in a third frequency band.
7. The antenna structure of claim 6 , wherein:
the first resonant mode is an LTE-A low-frequency mode;
the second resonant mode is an LTE-A mid-frequency mode; and
the third resonant mode is an LTE-A high-frequency mode.
8. The antenna structure of claim 6 , wherein:
one of the two extending portions is electrically coupled to an end of the first radiating section adjacent to the first gap; and
a second one of the two extending portions is electrically coupled to an end of the second radiating portion adjacent to the first gap.
9. The antenna structure of claim 2 , wherein:
a portion of the border frame between the first feed source and the first gap defines a first radiating section;
a portion of the border frame between the first feed source and the second gap defines a second radiating section;
the second feed source is electrically coupled to the third radiating portion;
when the first feed source supplies the electric current, the electric current from the first feed source flows through the first radiating section toward the first gap to excite a first resonant mode and generate a radiation signal in a first frequency band;
the electric current from the first feed source flows through the second radiating section toward the second gap to excite a second resonant mode and generate a radiation signal in a second frequency band;
the electric current from the first feed source flows through the first radiating section and is electrically coupled to the second radiating portion through the first gap to excite a third resonant mode and generate a radiation signal in a third frequency band;
when the second feed source supplies the electric current, the electric current from the second feed source flows through the third radiating portion to excite a fourth resonant mode and generate a signal in a fourth frequency band.
10. The antenna structure of claim 9 , wherein:
the first resonant mode is an LTE-A low-frequency mode;
the second resonant mode is an LTE-A mid-frequency mode;
the third resonant mode is an LTE-A high-frequency mode; and
the fourth resonant mode is an LTE-A mid-high-frequency mode.
11. The antenna structure of claim 9 , wherein:
a first antenna comprises the first feed source, the first radiating portion, and the second radiating portion, the first antenna being adapted to excite a resonant mode in an LTE-A low, middle, and high-frequency mode;
a second antenna comprises the second feed source and the third radiating portion, the second antenna being adapted to excite a resonant mode in an LTE-A mid-high-frequency mode; and
the first antenna and the second antenna cooperative form a multi-input and multi-output antenna structure.
12. The antenna structure of claim 1 , wherein the middle frame and the border frame are integrally formed.
13. The antenna structure of claim 3 further comprising a switching circuit comprising a switching unit and at least one switching component, wherein:
the switching unit is electrically coupled to the first radiating section;
the at least one switching component is electrically coupled in parallel;
one end of each of the at least one switching component is electrically coupled to the switching unit, and another end of each of the at least one switching component is electrically coupled to ground;
the switching unit switches a connection between the first radiating section and the at least one switching component to adjust a frequency of the first frequency band.
14. The antenna structure of claim 6 further comprising a switching circuit comprising a switching unit and at least one switching component, wherein:
the switching unit is electrically coupled to the first radiating section;
the at least one switching component is electrically coupled in parallel;
one end of each of the at least one switching component is electrically coupled to the switching unit, and another end of each of the at least one switching component is electrically coupled to ground;
the switching unit switches a connection between the first radiating section and the at least one switching component to adjust a frequency of the first frequency band.
15. The antenna structure of claim 9 further comprising a switching circuit comprising a switching unit and at least one switching component, wherein:
the switching unit is electrically coupled to the first radiating section;
the at least one switching component is electrically coupled in parallel;
one end of each of the at least one switching component is electrically coupled to the switching unit, and another end of each of the at least one switching component is electrically coupled to ground;
the switching unit switches a connection between the first radiating section and the at least one switching component to adjust a frequency of the first frequency band.
16. A wireless communication device comprising an antenna structure comprising:
a housing comprising a middle frame and a border frame, wherein the middle frame and the border frame are made of metal, the border frame is mounted around a periphery of the middle frame, the border frame comprises a slot, a first gap, and a second gap, the slot is in an inner side of the border frame, a width of a first portion of the border frame defining the slot is less than a width of a second portion of the border frame not defining the slot, the first gap and the second gap are in the border frame, the slot, the first gap, and the second gap divide the border frame into a first radiating portion, a second radiating portion, and a third radiating portion, the first radiating portion is insulated from the middle frame by the slot;
a first feed source electrically coupled to the first radiating portion and adapted to provide an electric current to the first radiating portion;
a second feed source electrically coupled to one of the second radiating portion and the third radiating portion, another one of the second radiating portion and the third radiating portion being electrically coupled to the first radiating portion; and
two extending portions, wherein the two extending portions face to each other, the two extending portions are electrically coupled to two radiating portions adjacent to one of the first gap and the second gap; wherein:
a thickness of the border frame is greater than or equal to twice a width of the first gap or twice a width of the second gap; and
a width of the slot is less than or equal to half the width of the first gap or half the width of the second gap.
17. The wireless communication device of claim 16 , wherein:
the border frame comprises an end portion, a first side portion, and a second side portion;
the first side portion and the second side portion are respectively coupled to opposite ends of the end portion;
the first gap is in the end portion adjacent the first side portion, and the second gap is in the end portion adjacent the second side portion;
the slot is in an inner side of the end portion and extends toward the first side portion and the second side portion;
the first radiating portion is defined in a portion of the border frame between the first gap and the second gap;
the second radiating portion is defined in a portion of the border frame between the first gap and an endpoint of the first side portion;
the third radiating portion is defined in a portion of the border frame between the second gap and an endpoint of the second side portion.
18. The wireless communication device of claim 17 , wherein:
a portion of the border frame between the first feed source and the first gap defines a first radiating section;
a portion of the border frame between the first feed source and the second gap defines a second radiating section;
the second feed source is electrically coupled to the second radiating portion;
when the first feed source supplies the electric current, the electric current from the first feed source flows through the first radiating section to excite a first resonant mode and generate a radiating signal in a first frequency band;
the electric current from the first feed source flows through the second radiating section and is electrically coupled to the third radiating portion through the second gap to excite a second resonant mode and generate a radiation signal in a second frequency band;
when the second feed source supplies the electric current, the electric current from the second feed source flows through the second radiating portion to excite a third resonant mode and generate a radiation signal in a third frequency band.
19. The wireless communication device of claim 17 , wherein:
the second feed source is electrically coupled to the third radiating portion;
when the first feed source supplies the electric current, the electric current from the first feed source flows through the first radiating portion to excite a first resonant mode and generate a radiation signal in a first frequency band;
the electric current from the first feed source flows through the first radiating portion and is electrically coupled to the second radiating portion through the first gap to excite a second resonant mode and generate a radiation signal in a second frequency band;
the electric current from the first feed source flows through the third radiating portion to excite a third resonant mode and generate a radiation signal in a third frequency band.
20. The wireless communication device of claim 17 , wherein:
a portion of the border frame between the first feed source and the first gap defines a first radiating section;
a portion of the border frame between the first feed source and the second gap defines a second radiating section;
the second feed source is electrically coupled to the third radiating portion;
when the first feed source supplies the electric current, the electric current from the first feed source flows through the first radiating section toward the first gap to excite a first resonant mode and generate a radiation signal in a first frequency band;
the electric current from the first feed source flows through the second radiating section toward the second gap to excite a second resonant mode and generate a radiation signal in a second frequency band;
the electric current from the first feed source flows through the first radiating section and is electrically coupled to the second radiating portion through the first gap to excite a third resonant mode and generate a radiation signal in a third frequency band;
when the second feed source supplies the electric current, the electric current from the second feed source flows through the third radiating portion to excite a fourth resonant mode and generate a signal in a fourth frequency band.