| 摘要 |
<p>Provided are a frequency stabilization circuit, frequency stabilization device, antenna device, and communication terminal apparatus capable of stabilizing frequency characteristics of a high-frequency signal without being affected by radiating elements, shape of housing, or placement of neighboring components. Also provided is an impedance transformation element with minimal insertion loss. The disclosed antenna device is provided with first and second radiating elements (11 and 21), a feed circuit (30) connected to each of the radiating elements (11 and 21), and a frequency stabilization circuit (35) provided between the feed circuit (30) and the first radiating element (11). The frequency stabilization circuit (35) includes a primary side series circuit (36) connected to the feed circuit (30), and a secondary side series circuit (37) coupled with the primary side series circuit (36) across an electric field or a magnetic field. First and second inductance elements (L1 and L2) are serially connected, and third and fourth inductance elements (L3 and L4) are serially connected. The first and third inductance elements (L1 and L3) are mutually coupled, and the second and fourth inductance elements (L2 and L4) are mutually coupled.</p> |
