A Compact Espar Antenna with Planar Parasitic Elements on a Dielectric Cylinder(<Special Section>2004 International Symposium on Antennas and Propagation)

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概要

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• This paper presents a technique for designing a dielectric Electronically Steerable Parasitic Array Radiator (Espar) antenna to achieve miniaturization of the conventional Espar antenna. The antenna's size is reduced by immersing the central active element in a dielectric cylinder, mounting the surrounding planar parasitic elements at the circumference of the cylinder, and decreasing the radius of the ground skirt to that of the parasitic elements. An example of a polycarbonate (ε_r=2.9+j0.006) Espar antenna operating at 2.484 GHz is optimised by using a genetic algorithm in conjunction with an FEM-based cost function. The designed antenna generates a half-power beam width of 78° and a main lobe that elevates at an angle of only 5° from the horizontal plane. The designed antenna is also fabricated and measured. Good agreement between the measurement and simulation results is obtained. We reduce the size of the designed Espar antenna to 1/8 the size of its conventional counterpart while achieving a 12° improvement in half-power beam width.

• 社団法人電子情報通信学会の論文
• 2005-06-01

著者

• HAN Qing

  ATR

• Ohira Takashi

  Atr

• HANNA Brett

  Startronics

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• A Compact Espar Antenna with Planar Parasitic Elements on a Dielectric Cylinder(2004 International Symposium on Antennas and Propagation)

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