Removal data storing medium having loop antenna

Claim 2

An antenna device comprising: a loop antenna main body having a predetermined aperture area; a conductor element insulated from the loop antenna main body, connected to a ground potential, and formed in parallel with the loop antenna main body; a ferrite plate disposed across the loop antenna main body from the conductor element at a predetermined distance, the ferrite plate having a size equal to or larger than a size of the loop antenna main body; and a copper plate electrically connected to the ferrite plate, and stuck to the ferrite plate across from the loop antenna main body.

Claim 3

An antenna device according to claim 1 , further comprising: a resonance capacitor and a Q adjusting resistor forming the loop antenna, the resonance capacitor and the Q adjusting resistor being disposed on a line of the loop antenna main body so as to be on a straight line.

Claim 4

An antenna device according to claim 1 , further comprising: an insulative board provided to support the conductor element, the board taking the shape of a rectangle having long sides and short sides, the board having a through hole for connecting an extension of the conductor element to ground of the loop antenna main body at the center of a long side.

Claim 5

An antenna device according to claim 3 , further comprising: a resonance capacitor and a Q adjusting resistor forming the loop antenna, the resonance capacitor and the Q adjusting resistor being disposed near a center of a long side of the loop antenna main body so as to be on a straight line.

Claim 6

A portable data processing apparatus comprising: a loop antenna main body having a predetermined aperture area; a conductor element insulated from the loop antenna main body, connected to a ground potential, and formed in parallel with the loop antenna main body; transmitting/receiving means for transmitting and receiving predetermined information with an external data processing apparatus by transmitting and receiving radio waves via the loop antenna main body; data processing means for conducting predetermined processing on the predetermined information transmitted and received by the transmitting/receiving means; a ferrite plate disposed across the loop antenna main body from the conductor element at a predetermined distance, the ferrite plate having a size equal to or larger than a size of the loop antenna main body; and a copper plate electrically connected to the ferrite plate, and stuck to the ferrite plate across from the loop antenna.

Claim 7

A portable data processing apparatus comprising: a loop antenna main body having a predetermined aperture area; a conductor element insulated from the loop antenna main body, connected to a ground potential, and formed in parallel with the loop antenna main body; transmitting/receiving means for transmitting and receiving predetermined information with an external data processing apparatus by transmitting and receiving radio waves via the loop antenna main body; data processing means for conducting predetermined processing on the predetermined information transmitted and received by the transmitting/receiving means; a ferrite plate disposed across the loop antenna main body from the conductor element at a predetermined distance, the ferrite plate having a size equal to or larger than a size of the loop antenna main body; and a copper plate electrically connected to the ferrite plate, and stuck to the ferrite plate across from the loop antenna.

Claim 8

A portable data processing apparatus according to claim 5 , further comprising: a resonance capacitor and a Q adjusting resistor forming the loop antenna, the resonance capacitor and the Q adjusting resistor being disposed on a line of the loop antenna main body so as to be on a straight line.

Claim 9

A portable data processing apparatus according to claim 5 , further comprising: an insulative board provided to support the conductor element, the board taking the shape of a rectangle having long sides and short sides, the board having a through hole for connecting an extension of the conductor element to ground of the loop antenna main body at the center of a long side.

Claim 10

A portable data processing apparatus according to claim 7 , further comprising: a resonance capacitor and a Q adjusting resistor forming the loop antenna, the resonance capacitor and the Q adjusting resistor being disposed near a center of a long side of the loop antenna main body so as to be on a straight line.

Claim 11

An antenna device comprising: a loop antenna main body having a predetermined aperture area; a conductor element insulated from the loop antenna main body, connected to a ground potential, and formed in parallel with the loop antenna main body; a magnetic substance disposed across the loop antenna main body from the conductor element at a predetermined distance, the magnetic substance having a size equal to or larger than a size of the loop antenna main body; and a copper plate electrically connected to the magnetic substance, and stuck to the magnetic substance across from the loop antenna main body.

Claim 12

An antenna device comprising: a loop antenna main body having a predetermined aperture area; a conductor element insulated from the loop antenna main body, connected to a ground potential, and formed in parallel with the loop antenna main body; a magnetic substance disposed across the loop antenna main body from the conductor element at a predetermined distance, the magnetic substance having a size equal to or larger than a size of the loop antenna main body; and a copper plate electrically connected to the magnetic substance, and stuck to the magnetic substance across from the loop antenna main body.