| 摘要 |
Disclosed are a penta-band internal antenna and a mobile communication terminal thereof. The internal antenna comprises: a first high-frequency branch, a second high-frequency branch, and a low-frequency branch of an antenna radiating element, and a first slotted hole and a second slotted hole arranged on a printed circuit board. The first slotted hole is arranged along the direction perpendicular to the flow of current of the printed circuit board. The open end of the low-frequency branch fits into the first slotted hole; the open end of the second high-frequency branch fits into the second slotted hole. Because the addition of the slotted holes is employed on the printed circuit board to adjust the low-frequency resonance thereof, the low-frequency resonance is brought towards the center frequency of the low-frequency branch, and the printed circuit board is excited via capacitance coupling to generate a resonance. The second slotted hole is exited via capacitance coupling into resonating, and combines with the first high-frequency branch to form a high-frequency bandwidth. A frequency shift caused by the terminal being held in a user's hand is compensated, and the characteristics of the mobile communication terminal when operating in a hand-held mode are optimized. Relatively expansive bandwidth is thereby accommodated in a limited space, and the needs of mobile communication terminal miniaturization development are met. |
