Handheld device and planar antenna thereof

摘要

A handheld device and a planar antenna thereof are provided. The planar antenna comprises a radiator, a screening element and a switch. The screening element is configured to make the planar antenna operating in a first high-frequency (HF) current path and a first low-frequency (LF) current path, and the switch is configured to make the planar antenna operating in a second HF current path and a second LF current path. The planar antenna operates at a first HF central frequency corresponding to the first HF current path and a first LF central frequency corresponding to the first LF current path when the switch is turned off, and operates at a second HF central frequency corresponding to the second HF current path and a second LF central frequency corresponding to the second LF current path when the switch is turned on.

主权项

1. A planar antenna, comprising:
a radiator, comprising:
a first portion comprising a first contact point and a second contact point;a second portion comprising a third contact point, a fourth contact point electrically connected to the second contact point, and a fifth contact point; anda third portion comprising a sixth contact point; a screening element, being electrically connected between the fifth contact point and the sixth contact point to make the planar antenna operating in a first high-frequency (HF) current path and a first low-frequency (LF) current path; and a switch, being electrically connected between the first contact point and the third contact point to make the planar antenna operating in a second HF current path and a second LF current path;
wherein when the switch is turned off, the planar antenna operates at a first HF central frequency corresponding to the first HF current path and a first LF central frequency corresponding to the first LF current path at the same time, and when the switch is turned on, the planar antenna operates at a second HF central frequency corresponding to the second HF current path and a second LF central frequency corresponding to the second LF current path at the same time.