Experimental and theoretical analysis of anisotropic trapezoidal antennas


  • Branko D. Popović,

  • Antonije R. Djordjević


A novel broadband antenna is described, in the form of a comblike trapezoidal anisotropic structure above a ground plane. The base of the comb is mounted close to the ground plane, parallel to it, and is fed at one end by a coaxial line. Such an antenna has uniquely defined polarization of the radiated field and very good aerodynamic properties. An experimental model of the antenna was made using printed-circuit technique. By trimming the upper edge of the comb, an antenna was obtained experimentally having VSWR less than 2.0 (with respect to 50 Ω) in a frequency range of about two octaves. It was found that the antenna radiation pattern varies with frequency, but that a direction exists in which the antenna radiates well at all frequencies in the range. A mathematical model was also developed, permitting rather accurate numerical analysis of the antenna.