The electric characteristic parameters of this novel sleeve antenna are calculated, including the input impedance, voltage standing wave ratio (VSWR), horizontal gain and radiation pattern.
研究了这种新型套筒天线的输入阻抗、电压驻波比（VSWR）、增益及辐射方向图等电特性。
2
The antenna element has a ridge element unit (21) for adjusting antennacharacteristic corresponding to a ridge portion and a radial element unit (22) for electromagnetic wave radiation.