A Compact Planar Antenna Based on Matryoshka-Like Geometry

This paper introduces a compact antenna, MTK-LA. The MTK-LA is composed of a matryoshka-like geometry and a partial ground plane. The matryoshka-like geometry is described, including initial design equations. The initial dimensions of the partial ground plane are suggested, and a parametric analysis is presented. To verify the expected characteristics, a prototype operating at 312 MHz was designed, fabricated and characterized, verifying a good agreement between numerical and measured results. A bandwidth of 6 MHz was achieved. One of the most interesting features observed was the reduced dimensions, achieving an overall dimension of 0.052λ<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf>× 0.052λ<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf>. Despite the MTK-LA being especially attractive for low frequency (dozens of MHz) applications, it can be designed for higher frequency applications.