Dual-band radio frequency identification tag antenna for metallic objects

A dual-band RFID tag antenna for mounting on a metallic object, the dual-band RFID tag antenna comprising:

• a dielectric substrate having a first surface and a second surface opposing the first surface;
• a conductive layer provided on the first surface of the dielectric substrate, the conductive layer being configured to be attached to a surface of the metallic object;
• an integrated circuit mounted on the second surface of the dielectric substrate;
• an antenna structure formed on the second surface of the dielectric substrate, the antenna structure configured to have a first resonance at a first frequency band and a second resonance at a second frequency band, wherein the antenna structure comprises two antenna parts arranged in a dipole structure, each antenna part comprising a first leg portion and a second leg portion, wherein a resonant length of each antenna part corresponds to a length from an end of the first leg portion to an end of the second leg portion;
• a loop feed structure formed on the second surface of the dielectric substrate, the feed loop structure configured to electromagnetically couple the antenna structure to the integrated circuit;
• a first via pin passing through the dielectric substrate and electrically connecting a first point on the antenna structure with a corresponding first point on the conductive layer;
• and
• a second via pin passing through the dielectric substrate and electrically connecting a second point on the antenna structure with a corresponding second point on the conductive layer.

A dual-band RFID tag antenna for mounting on a metallic object, the dual-band RFID tag antenna comprising:

• a dielectric substrate having a first surface and a second surface opposing the first surface;
• a conductive layer provided on the first surface of the dielectric substrate, the conductive layer being configured to be attached to a surface of the metallic object;
• an integrated circuit mounted on the second surface of the dielectric substrate;
• an antenna structure formed on the second surface of the dielectric substrate, the antenna structure configured to have a first resonance at a first frequency band and a second resonance at a second frequency band;
• a loop feed structure formed on the second surface of the dielectric substrate, the feed loop structure configured to electromagnetically couple the antenna structure to the integrated circuit;
• a first via pin passing through the dielectric substrate and electrically connecting a first point on the antenna structure with a corresponding first point on the conductive layer;
• and
• a second via pin passing through the dielectric substrate and electrically connecting a second point on the antenna structure with a corresponding second point on the conductive layer,
• wherein the antenna structure comprises coupling portions arranged adjacent to the loop feed structure and the coupling portions have a stepped edge on a side facing away from the loop feed structure.