导体板上的法向模螺旋天线的研究

Studies on Normal-Mode Helical Antenna Laid on a Conducting Plane

一种新型低姿态磁流天线的设计方法，实验性的测定了位于导体板上法向模螺旋天线的电流相位常数。当螺旋线与导体板间的绝缘层为０．１ｍｍ时，沿螺旋线导线的波长几乎就等于自由空间的波长，这些测试结果可作为同相磁流激励螺旋天线的指导性设计资料。另外如果把螺旋天线置于导体槽内，则其辐射功率和方向图与导体板上的几乎是一致的。

In this paper a new low-profile magnetic current antenna design method is introduced. The phase constants of antenna currents on a normal mode belieal antenna which are laid on a conducting plane are measured experimentally. When the insulation thickness between the helix on the plane is 0. lmm the wavelengthalong the belieal antenna is almost equal to that of the free space. The measured results can be used as a design guideline for such antenna of in-phase excitation in magnetic flux along the belieal axis. Also, almost thesame radiation power and pattern can be obtained even if the antenna is laid in a conducting groove.