Antenna assembly and method for fabricating the same

A mobile phone comprising:

• a base board made of dielectric material, and having upper and lower surfaces, each of which defines a grounding domain and a dielectric domain, said base board further having a first metal layer disposed on said grounding domain of said lower surface and a second metal layer disposed on said grounding domain of said upper surface;
• and
• an antenna assembly mounted on said base board for transmitting and receiving radio signals, said antenna assembly including
• an antenna unit fabricated on said dielectric domain of said upper surface of said base board, and having an antenna body and a feeding line;
• a plurality of conductive through holes formed through said base board for electrically connecting said first and second metal layers, thereby permitting coupled current flow generated in said second metal layer to flow into said first metal layer;
• a first slot of predetermined length formed in said first metal layer for enhancing effective coupled current flowing into said first metal layer, thereby increasing transmitting and receiving ability of said antenna unit;
• and
• a RF module mounted on said base board and coupled electrically to said feeding line of said antenna unit for processing said radio signals.

A method for fabricating an antenna assembly comprising the steps of:

• (1) preparing a base board having upper and lower surfaces, each of which defines a grounding domain and a dielectric domain;
• (2) providing a first metal layer on said grounding domain of said lower surface of said base board;
• (3) providing a second metal layer on said grounding domain of said upper surface of said base board;
• (4) fabricating an antenna unit on said dielectric domain of said upper surface of said base board;
• (5) forming a plurality of conductive through holes through said base board for electrically connecting said first and second metal layers, thereby permitting coupled current flow generated in said second metal layer to flow into said first metal layer;
• and
• (6) forming a first slot of predetermined length in said first metal layer for enhancing effective coupled current flowing into said first metal layer, thereby increasing transmitting and receiving ability of said antenna unit.