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An antenna module for a portable electronic device includes a loop portion, a dipole portion, a feeding end portion and a grounding end portion. The dipole portion is positioned in the loop portion and connected to the loop portion. The feeding end portion and the grounding end portion are connected

An antenna module for a portable electronic device includes a loop portion, a dipole portion, a feeding end portion and a grounding end portion. The dipole portion is positioned in the loop portion and connected to the loop portion. The feeding end portion and the grounding end portion are connected to the loop portion.

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1. An antenna module for a portable electronic device, comprising: a loop portion that is substantially a rectangular frame with an opening, the loop portion comprising a first radiating section defining the opening, a second radiating section opposite and parallel to the first radiating section, an

1. An antenna module for a portable electronic device, comprising: a loop portion that is substantially a rectangular frame with an opening, the loop portion comprising a first radiating section defining the opening, a second radiating section opposite and parallel to the first radiating section, and two opposite and parallel connecting sections, the connecting sections interconnecting the first radiating section and the second radiating section;a dipole portion positioned in the loop portion and connected to the second radiating section of the loop portion; anda feeding end portion and a grounding end portion both connected to the first radiating section of the loop portion. 2. The antenna module as claimed in claim 1, wherein the loop portion and the dipole portion define two gaps therebetween. 3. The antenna module as claimed in claim 2, wherein each gap is substantially U-shaped. 4. The antenna module as claimed in claim 1, wherein the dipole portion includes a first radiating arm, a second radiating arm and two connecting ends; the first radiating arm and the second radiating arm are collinear and define a slot therebetween, a first end of each connecting end connects to one of the first and second radiating arms, a second end of each connecting end connects to the second radiating section. 5. The antenna module as claimed in claim 4, wherein the slot communicates with the opening. 6. A portable electronic device, comprising: a housing;a circuit board including a feeding point and a grounding point mounted on the housing;a substrate mounted on the housing and supported by the circuit board; andan antenna module mounted on the substrate; comprising:a loop portion that is substantially a rectangular frame with an opening, the loop portion comprising a first radiating section defining the opening, a second radiating section opposite and parallel to the first radiating section, and two opposite and parallel connecting sections, the connecting sections interconnecting the first radiating section and the second radiating section;a dipole portion positioned in the loop portion and connected to the second radiating section of the loop portion; anda feeding end portion and a grounding end portion both connected to the first radiating section of the loop portion and respectively connected to the feeding point and the grounding point. 7. The portable electronic device as claimed in claim 6, wherein the substrate includes a top surface, a bottom surface opposite to top surface, a side surface connecting to the top surface and the bottom surface and a stepped mounting surface recessed from the bottom surface; the mounting surface is attached to the circuit board and supported by the circuit board; the feeding end portion and the grounding end portion are attached on the top surface; the loop portion and the dipole portion are attached on the side surface. 8. The portable electronic device as claimed in claim 6, wherein the loop portion and the dipole portion define two gaps therebetween. 9. The portable electronic device as claimed in claim 8, wherein each gap is substantially U-shaped. 10. The portable electronic device as claimed in claim 9, wherein the dipole portion includes a first radiating arm, a second radiating arm and two connecting ends; the first radiating arm and the second radiating arm are collinear and define a slot therebetween, a first end of each connecting end connects to one of the first and second radiating arms, a second end of each connecting end connects to the second radiating section. 11. The portable electronic device as claimed in claim 10, wherein the slot communicates with the opening. 12. A portable electronic device, comprising: a housing;a circuit board including a feeding point and a grounding point mounted on the housing;a substrate mounted on the housing and supported by the circuit board, the substrate comprising: a top surface;a bottom surface opposite to top surface;a side surface connecting to the top surface and the bottom surface; anda stepped mounting surface recessed from the bottom surface, the mounting surface attached to the circuit board and supported by the circuit board; andan antenna module mounted on the substrate; comprising:a loop portion attached on the side surface;a dipole portion positioned in the loop portion and connected to the loop portion, the dipole portion attached on the side surface; anda feeding end portion and a grounding end portion both connected to the loop portion and respectively connected to the feeding point and the grounding point, the feeding end portion and the grounding end portion attached on the top surface. 13. The portable electronic device as claimed in claim 12, wherein the loop portion is substantially a rectangular frame with an opening. 14. The portable electronic device as claimed in claim 13, wherein the loop portion comprises a first radiating section defining the opening, a second radiating section opposite and parallel to the first radiating section, and two opposite and parallel connecting sections, the connecting sections interconnect the first radiating section and the second radiating section. 15. The portable electronic device as claimed in claim 14, wherein the dipole portion includes a first radiating arm, a second radiating arm and two connecting ends; the first radiating arm and the second radiating arm are collinear and define a slot therebetween, a first end of each connecting end connects to one of the first and second radiating arms, a second end of each connecting end connects to the second radiating section. 16. The portable electronic device as claimed in claim 15, wherein the slot communicates with the opening.