| 摘要 |
<p>In order to provide a wireless communication apparatus that reduces noise and maintains its receiving sensitivity, a stub (5) with a base end (51) electrically connected with a ground- coupling portion (7) adjacent to an RF circuit (4) and with a tip end (52) opened is formed on a surface layer (10S) of a circuit board (1). Further, the stub (5) is formed by a 1/4? electrical length ground pattern (5) made of a part of a ground (10) of the circuit board (1) in a peninsular shape. A connection from the RF circuit (4) to a chip antenna (3) and a connection from the base edge (51) of the 1/4? electrical length ground pattern (5) to the ground coupling portion (7) are wired at minimized distances. In addition, a plurality of 1/4? electrical length ground patterns that resonate with different wavelength are provided as the stub (5) and their base edges are connected with the ground coupling portion (7) at minimized distances.</p> |
