| 摘要 |
A loop-shaped antenna is disposed in a mobile terminal, where the mobile terminal includes a metal back cover at least partially covers the loop-shaped antenna; the loop-shaped antenna includes a feeding matching circuit, a grounding circuit, and a radiation portion, where the radiation portion is connected between the feeding matching circuit and the grounding circuit, and the radiation portion is of a symmetrical loop-shaped structure; the grounding circuit includes a switch component and a inductor, where the switch component and the inductor are connected in parallel and between ground and the radiation portion; the feeding matching circuit includes a feeding end and a variable capacitor, where the variable capacitor is connected between the feeding end and the radiation portion; and the feeding matching circuit is configured to adjust impedance matching of the loop-shaped antenna, and the grounding circuit is configured to adjust a resonance frequency of the loop-shaped antenna. |
