| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a small antenna circuit which can ensure a wide band. <P>SOLUTION: The antenna circuit includes inductance elements L1 and L2 that are magnetically coupled together as radiation elements, an LC series resonance circuit that includes an inductance element L1 and capacitance elements C1a and C1b, and an LC series resonance circuit that includes an inductance element L2 and capacitance elements C2a and C2b. A plurality of LC series resonance circuits are used to radiate radio waves and are used as inductances of a matching circuit that matches an impedance (50 Ω) when a power supply side is viewed from power supply terminals 5 and 6 and a radiation impedance (377 Ω) of free space. <P>COPYRIGHT: (C)2008,JPO&INPIT |
