公开(公告)号：EP1026777A2

公开(公告)日：2000-08-09

申请号：EP99309639.5

申请日：1999-12-01

申请人： Marconi Electronic Systems Limited

发明人： Newham, Paul

IPC分类号： H01Q1/36 ,  H01Q9/27 ,  H01Q11/10 ,  H01Q1/38

CPC分类号： H01Q9/27 ,  H01Q1/36

摘要： The outer turns (3) of a spiral antenna are radially modulated to extend the low-frequency response. The modulation amplitude increases progressively with spiral angle.
The unmodulated region may consist of equally-spaced inner turns (1), and outer turns (2) whose spacing increases with angle. The track width of the outer turns may progressively decrease. Alternatively the track width of the outer unmodulated region may increase, the width of the modulated turns then progressively decreasing. Similar modulation may be applied to the outer ends of the arms of sinuous antennas.

摘要翻译： 螺旋天线的外圈（3）被径向调制以扩展低频响应。 调制幅度随螺旋角逐渐增大。 未调制的区域可以由等间隔的内圈（1）和其间距随角度增加的外圈（2）组成。 外圈的轨道宽度可以逐渐减小。 或者，外部未调制区域的轨道宽度可以增加，然后调制匝圈的宽度逐渐减小。 类似的调制可以应用于弯曲天线的臂的外端。

公开(公告)号：EP1026777A3

公开(公告)日：2000-08-16

申请号：EP99309639.5

申请日：1999-12-01

申请人： Marconi Electronic Systems Limited

发明人： Newham, Paul

IPC分类号： H01Q1/36 ,  H01Q9/27 ,  H01Q11/10 ,  H01Q1/38

CPC分类号： H01Q9/27 ,  H01Q1/36

摘要： The outer turns (3) of a spiral antenna are radially modulated to extend the low-frequency response. The modulation amplitude increases progressively with spiral angle. The unmodulated region may consist of equally-spaced inner turns (1), and outer turns (2) whose spacing increases with angle. The track width of the outer turns may progressively decrease. Alternatively the track width of the outer unmodulated region may increase, the width of the modulated turns then progressively decreasing. Similar modulation may be applied to the outer ends of the arms of sinuous antennas.