| 摘要 |
A variable tuning antenna has a tuning circuit (1) connected to a radiation element (2) in series. In the tuning circuit (1), a first inductance element (11) is connected in parallel to a parallel circuit (12) where a second inductance element (121) is connected in parallel to a variable capacitive element (122). In the tuning circuit, the combined reactance of the radiation element and the first inductance element and the combined reactance of the parallel circuit cancel each other in a desired reception frequency band, and the parallel circuit does not resonate in the desired frequency band. The tuning circuit is tunable in the desired frequency band by varying the capacitance of the variable capacitive element. As a result, the variable tuning antenna can be mounted to, e.g., a mobile phone, and the whole band is variable in a wide low-frequency band such as a digital TV band. A mobile wireless device comprising the antenna is also disclosed.
|
