Patent ID: 8477071
Filing Date: 2013-07-02
Classification: H01Q

Abstract:
1. A multi-band antenna mounted on a circuit board, comprising: an elongated ground plate perpendicularly connected to a first side edge of the circuit board; a radiating plate perpendicularly connected to a second side edge which is opposite the first side edge of the circuit board and facing the ground plate; and a planar antenna element disposed on the circuit board, comprising a high frequency radiating portion located at a first end of the circuit board with a distal end of the high frequency radiating portion connected to the radiating plate; a lower frequency radiating portion located at a second end of the circuit board opposite the first end with one end of the lower frequency radiating portion connected to the radiating plate; a base plate located between the high and lower frequency radiating portions, the base plate connected to the radiating plate and spaced from and adjacent to the ground plate, the high frequency radiating portion extended from a first side of the base plate, the lower frequency radiating portion spaced apart from the base plate, the base plate having a feeding point arranged at a portion thereof; a capacitance portion extended from a second side of the base plate opposite the first side and parallel with and adjacent to the ground plate to form a capacitive coupling between the capacitance portion and the ground plate; and an inductance portion including an elongated first strip and an L-shaped second strip connected with a distal end of the elongated first strip, the elongated first strip extended opposite to the capacitance portion from the first side of the base plate adjacent to the ground plate, the L-shaped second strip having a short arm connected with the distal end of the elongated first strip and a long arm parallel with and adjacent to the first strip, the long arm soldered to the ground plate, a slot formed between the elongated first strip and the L-shaped second strip, a simulation inductance formed by the inductance portion.