| 摘要 |
PROBLEM TO BE SOLVED: To realize a technique that extends an antenna communication area while avoiding deterioration in reception sensitivity depending on a reception position. SOLUTION: A capacitor 5b is connected to a coil 5a placed between two loop antennas 3, 4 to form a closed loop circuit (resonance circuit) 5. The circuit 5 is electromagnetically coupled with the antennas 3, 4 and the magnetic flux formed by them interlinks an area surrounded by a profile of the circuit 5. Thus, when the antennas 3, 4 are fed in phase, the closed loop circuit 5 acts like a loop antenna to produce a large amount 5b magnetic flux between the antennas 3, 4. |
