LTE full-band cellphone antenna structure
Provided is an LTE full-band cellphone antenna structure, including a ground plate, a circuit board having a feeding point, a feeding terminal matching circuit provided on the circuit board and a metal unit surrounding the circuit board and the ground plate. The metal unit includes a grounding portion electrically connected with the ground plate and a non-grounding portion electrically disconnected with the grounding portion. The feeding point is electrically connected with the non-grounding portion so that the non-grounding portion serves as a middle-high frequency radiator. A gap is provided between the non-grounding portion and the ground plate, and the ground plate is excited in a coupling manner so as to generate a current, such that the ground plate serves as a low frequency radiator. The antenna of the present disclosure covers all LTE frequency bands, which has advantages of less tuning difficulty and less influence by processing accuracy.
1. A long term evolution (LTE) full-band cellphone antenna structure, comprising:
a ground plate;
a circuit board having a feeding point;
a feeding terminal matching circuit provided on the circuit board; and
a metal unit surrounding the circuit board and the ground plate,
wherein the metal unit comprises a grounding portion electrically connected with the ground plate and a non-grounding portion electrically disconnected with the grounding portion, the feeding point is electrically connected with the non-grounding portion so that the non-grounding portion serves as a high frequency radiator, a gap is provided between the non-grounding portion and the ground plate, and the ground plate is excited in a manner of coupling so as to generate a current, such that the ground plate serves as a low frequency radiator;
the metal unit is a metal frame provided surrounding the ground plate and the circuit board, the ground plate has a pair of long edges and a pair of short edges connected with the long edges, the metal frame has a side edge spaced with the short edge of the ground plate, the side edge has two slottings which are arranged in parallel and spaced with each other, a portion between the two slottings is the non-grounding portion;
the LTE full-band antenna structure further comprises a duplex feeding unit, the duplex feeding unit has two feeding branches electrically connected with the non-grounding portion;
the duplex feeding unit is a metal sheet, the metal sheet is provided with a semi-closed slit, the slit extends to an edge of the metal sheet and forms an opening, so as to form two feeding branches which are electrically connected with the non-grounding portion.
2. The LTE full-band cellphone antenna structure as described in claim 1 , wherein the non-grounding portion takes the duplex feeding unit as a boundary point, a first portion from the duplex feeding unit to a slotting forms a first radiating branch, a second portion from the duplex feeding unit to another slotting forms a second radiating branch.
3. The LTE full-band cellphone antenna structure as described in claim 2 , wherein a length of the first radiating portion is larger than or equal to a length of the second radiating portion.
4. The LTE full-band cellphone antenna structure as described in claim 1 , wherein the feeding terminal matching circuit comprises two inductances which are arranged in parallel and a switch switchable between the two inductances.