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Log-periodic longitudinal slot antenna array excited by a waveguide with a conductive ridge
Log-periodic longitudinal slot antenna array excited by a waveguide with a conductive ridge
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机译：由具有导电脊的波导激发的对数周期纵向缝隙天线阵列
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摘要
A log-periodic longitudinal slot antenna array comprises a dimensionally linearly tapered ridged waveguide having a wall forming part of a metallic ground plane and in which longitudinally elongated and spaced slots are formed. The long axis of each slot is perpendicular to the transverse component of the magnetic field in the waveguide and the slots have dimensions and inner- slot spacings which decrease in increments of a predetermined ratio &tgr; in a direction toward the smaller end of the tapered waveguide. The antenna produces a fan-shaped beam with its narrowest radiation pattern lying in a plane perpendicular to a line parallel to the transverse magnetic field component in the waveguide. Such fan-shaped beams are obtainable when the antenna structure is fed at either the large or small ends of the waveguide, or at both ends, in which cases the boresight axes of the resultant beams extend in different directions. The distinguishing physical feature of unidirectional versions of the antenna relative to unidirectional versions in the antenna array family described in the herein identified cross-reference application is that all of the slot radiators are displaced to one side or to the other of the electric (E) plane of the waveguide but never to both of these sides. As such, the corresponding distinguishing electrical feature is that all sub- components of the time- phases of the electric field excitations in all slots due solely to the transverse locations of the slots are intrinsically identical. P PFor bi-directional radiation patterns, a similar array of slots is formed in the opposite wall of the waveguide which optionally may comprise an extended ground plane.
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