Two-element and multi-element planar array antennas

   
   

A two-element slot line array antenna comprises a substrate having a first and a second main surface, a conductor disposed on the first main surface, a slot line formed in the conductor, and a pair of slot line antenna elements formed in the conductor. The slot line has one end side electromagnetically coupled to the pair of antenna elements, and the other end side serving as a feed end. The pair of antenna elements is arranged in parallel with an electric field plane or a magnetic field plane formed by the slot line. The pair of antenna elements and the slot line are arranged in mirror symmetry with respect to a magnetic field plane or electric field plane which starts at the feed end, so that the pair of antenna elements is excited in phase.

 
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