摘要:
An antenna device (101) includes a first conductor plane (11) and a second conductor plane (12) that face each other. The first conductor plane (11) and the second conductor plane (12) are electrically continuous through a first connection conductor (21), a second connection conductor (22), and a chip capacitor (5). A power feed coil (30) is disposed between the first conductor plane (11) and the second conductor plane (12). The power feed coil (30) is composed of a magnetic core (30b) and a coil conductor (30a). The coil conductor (30a) forms a pattern such that the coil conductor (30a) winds around the magnetic core (30b). This power feed coil (30) is disposed at a position closer to the first connection conductor (21) and magnetically couples with the first connection conductor (21).
摘要:
A common mode filter (101) includes, between ports (P1, P2) and ports (P3, P4), a differential transmission line including a first signal line (SL1) and a second signal line (SL2). The first signal line (SL1) includes a first inductor (L1) arranged in series, and the second signal line (SL2) includes a second inductor (L2) arranged in series. In addition, a first resonant circuit (RC1) is provided between the first end of the first inductor (L1) and the ground, and a second resonant circuit (RC2) is provided between the first end of the second inductor (L2) and the ground.
摘要:
A portable electronic device is provided with a circuit board (100), and an antenna coil (200) mounted on the circuit board (100). The antenna coil (200) is provided with a magnetic core (201), and a coil (202) wound on the both sides by having in between a section (203) where no coil is wound. The coil (202) has different winding directions with the section (203) in between. The antenna coil is configured to satisfy inequalities of Y≥X≥0.8Y, where X is the length of the magnetic core (201), and Y is a distance between the two intersecting points of a virtual line, which is obtained by projecting the center line on the circuit board (100), and the outer circumference of the circuit board (100).
摘要:
An antenna device having a magnetic core (2) to be surface-mounted on a circuit substrate (1) has a pair of coil portion (A) and a coil portion (B) formed apart from each other at a predetermined interval d. The coil portion (A) and the coil portion (B) are connected by a connecting conductor (6). An end of the magnetic core has a curved or bent portion curved toward the circuit substrate. This structure constitutes an RFID antenna device having the high receiving sensitivity that can be surface-mounted without increasing the thickness of a casing of a mobile electronic device.
摘要:
In an antenna coil (2) including a first magnetic core (4a), a second magnetic core (4b), and a flexible board (5), coil conductors are provided on a surface of the flexible board (5). By winding the flexible board (5) around the first magnetic core (4a) and the second magnetic core (4b), a first coil portion (2a) is formed around the first magnetic core (4a), and a second coil portion (2b) is formed around the second magnetic core (4b). The winding direction of the second coil portion (2b) is opposite to that of the first coil portion (2a). The first coil portion (2a) and the second coil portion (2b) are connected to form one coil as a whole.