Rfid tag and ceramic patch antenna

Abstract

This invention relates to a radio frequency identification (RFID) tag and ceramic patch antenna for radio frequency identification systems. The radio frequency identification tag in accordance with this invention comprises; lower antenna member of which one end is formed with coupling projection for conjoining; upper antenna member of which one end is formed with coupling groove for conjoining; an RFID chip of which one end is conjoined with the coupling projection of the said lower antenna member and the other end is conjoined with the coupling groove of the said upper antenna member, containing the information of the objective management item which communicates with the terminal device; and a spacer which electrically isolates the said antenna members. The said antenna members are conjoined on the top and bottom sides of the said spacer in parallel direction. The RFID chip which is conjoined with the said antenna members is placed on the top or bottom side of the said spacer. The ceramic patch antenna in accordance with this invention comprises; a dielectric ceramic member formed with ceramic substance of which the permittivity is 4.0˜210 and formed with a feeder hole punched at the center; conductive film formed on one side of the said dielectric ceramic member; an earth plate affixed on the other side of the said dielectric ceramic and formed with a punched feeder hole at the center; a feeder pin which is inserted in the feeder hole of the said dielectric ceramic and contacted with and feeds electricity to the said conductive film. The said feeder pin is inserted into the feeder hole of the said dielectric ceramic. The said conductive film covers the feeder hole formed in the said dielectric ceramic and electrically contacts with the feeder pin inserted into the feeder hole. The feeder hole of the said earth plate is formed larger than the feeder hole of the said dielectric ceramic, so that electrically isolated with the said feeder pin.

1 - 24 . (canceled) 
   
   
       25 . A patch antenna characterized by comprising; dielectric ceramic of which permittivity is 4.0˜210 and a feeder hole ( 111 ) is formed by punching at center;
 conductive film ( 120 ) formed on one side of the said dielectric ceramic ( 110 ); an earth plate ( 130 ) formed on the other side of the said dielectric ceramic ( 110 ) and a feeder hole ( 111 ) is formed by punching at center;   a feeder pin ( 140 ) which penetrates the feeder hole ( 111 ) of the said dielectric ceramic ( 110 ), and electrically contacts with and feeds electricity to the said conductive film ( 120 );   wherein the said feeder pin ( 140 ) penetrates the feeder hole ( 111 ) of the dielectric ceramic ( 110 ), the said conductive film ( 120 ) is so formed as to cover the feeder hole ( 111 ) of the said dielectric ceramic ( 110 ) and to electrically contact with the said feeder pin ( 140 ) inserted through the feeder hole ( 111 ) of the dielectric ceramic ( 110 ), and the feeder hole ( 131 ) of the said earth plate ( 130 ) is larger than the feeder hole ( 111 ) of the dielectric ceramic ( 110 ) so that electrically isolated from the said feeder pin ( 140 ).   
   
   
       26 . A RFID patch antenna in accordance with  claim 25 , wherein the patch antenna is characterized by being enclosed in a case ( 300 ) which comprises;
 a top case member ( 310 ) which has the same shape and is combined at the said conductive film ( 120 ) side;   and a bottom case member ( 320 ) which has a feeder hole ( 322 ) at center and combined at the said earth plate ( 130 ) side.   
   
   
       27 . A RFID patch antenna in accordance with  claim 26 , wherein the said bottom case ( 320 ) is characterized by being made with metallic substance. 
   
   
       28 . A RFID patch antenna in accordance with  claim 25 , wherein the said patch antenna ( 100 ) is characterized by having multiple antenna members connected and laid-out symmetrically centering at a chip ( 60 ), and the distances form the chip ( 60 ) to the antenna members are all the same, so that the directionality and transmission efficiency can be improved.