RFID transponder chip modules with a band of the antenna extending inward
View Patent ↗The planar antenna (PA) of a transponder chip module (TCM) may have a U-shaped portion so that an outer end (OE) of the antenna may be positioned close to an RFID chip (IC) disposed at a central area of a module tape (MT) for the transponder chip module. A module tape (MT 2 ) may have contact pads (CP) on one side thereof and a connection bridge (CBR) on another side thereof, and may be joined with a module tape (MT 1 ) having a planar antenna (PA). Metal of a conductive layer (CL) within a conductive element such as a coupling frame (CF) or a planar antenna (PA) may be scribed to have many small segments. A metal sheet may be stamped to have contact side metallization, and joined with a module tape (MT) having a planar antenna (PA).
1. A transponder chip module (TCM) comprising:
a module tape (MT);
contact pads (CP) disposed on a face-up side of the module tape;
a planar antenna (PA) disposed on a face-down side of the module tape, and extending in a band in a rectangular spiral pattern around an outer area of the module tape, wherein the antenna has an inner end (IE) and an outer end (OE);
characterized in that:
a portion of the band of the planar antenna extends inward, towards a central area of the module tape, so that its outer end is not more than approximately 3 mm from an RFID chip (IC) disposed in the central area;
the planar antenna is laser etched as a long track having a number of turns;
the track has a width of approximately 100 μm or less; and
a space between turns of the track is approximately 25 μm or less.
2. The transponder chip module of claim 1 , wherein:
at least the outer end of the planar antenna is connected by wire-bonding to the RFID chip.
3. The transponder chip module of claim 1 , wherein:
the portion of the planar antenna extends into an area on the face-down side of the module tape corresponding with an area on the face-up side of the module tape between two contact pads.
4. The transponder chip module of claim 1 , wherein:
the inner end (IE) of the planar antenna is connected by wire bonding to the RFID chip; and
the outer end (OE) of the planar antenna is connected by wire bonding to the RFID chip.
5. A planar antenna (PA) for a transponder chip module (TCM) having the form of a rectangular spiral conductive trace having several turns, an inner end (IE) and an outer end (OE), and suitable to be disposed in a rectangular annular outer area of a module tape (MT);
characterized in that:
a shape of at least one side of the antenna is modified so that the outer end (OE) of the antenna is positioned closer to a center of the module tape than the remainder of the outermost turn of the antenna;
the planar antenna is laser etched as a long track having a number of turns;
the track has a width of approximately 100 μm or less; and
a space between turns of the track is approximately 25 μm or less.
6. The planar antenna of claim 5 , wherein:
the outer end is positioned closer to the center of the module tape than many or all of the turns of the antenna, including closer to the center than the innermost turn of the antenna.
7. A planar antenna (PA) for a transponder chip module (TCM) having the form of a rectangular spiral conductive trace having several turns, an inner end (IE) and an outer end (OE), disposed on an annular area of a module tape (MT);
wherein:
the planar antenna is laser etched as a long track having a number of turns;
the track has a width of approximately 100 μm or less; and
a space between turns of the track is approximately 25 μm or less.