| 摘要 |
A radiating element comprises a helical element (1), a diode (2) and a helical element (3). When the diode (2) is off, the helical elements (1, 3) are isolated from each other, so that only helical element (1) alone operates as a radiating element. When the diode (2) is on, the helical elements (1, 3) are connected and they cooperate.
|
