| 摘要 |
<p>A wrist carried wireless instrument comprises a case including circuits and a loop antenna (1) formed outside of the case. An antenna resonance circuit is formed by said loop antenna (1) and at least two capacitors (C1, C2) connected in series between the ends of said loop antenna (1). The connecting point (A) between the two capacitors (C1, C2) is held at a ground electric potential and the capacitors (C1, C2) are arranged such that their connecting point (A) is near to the intermediate value of the impedance formed by the capacitors. By this construction of the antenna resonance circuit the influence of the human body on the sensitivity of the antenna is greatly reduced.</p> |
