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High-gain subwavelength resonant cavity antennas based on metamaterial ground planes

High-gain subwavelength resonant cavity antennas based on metamaterial ground planes

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Planar metamaterial surfaces with negative reflection phase values are proposed as ground planes in a high-gain resonant cavity antenna configuration. The antenna is formed by the metamaterial ground plane (MGP) and a superimposed metallodielectric electromagnetic band gap (MEBG) array that acts as a partially reflective surface (PRS). A single dipole positioned between the PRS and the ground is utilised as the excitation. Ray analysis is employed to describe the functioning of the antennas and to qualitatively predict the effect of the MGP on the antenna performance. By employing MGPs with negative reflection phase values, the planar antenna profile is reduced to subwavelength values (less than λ/6) whilst maintaining high directivity. Full-wave simulations have been carried out with commercially available software (Microstripes™). The effect of the finite PRS size on the antenna radiation performance (directivity and sidelobe level) is studied. A prototype has been fabricated and tested experimentally in order to validate the predictions.

Inspec keywords: planar antenna arrays; electromagnetic wave reflection; dielectric resonator antennas; antenna testing; cavity resonators; photonic band gap; metamaterials; dipole antenna arrays

Other keywords: full-wave simulation; negative reflection phase value; metamaterial ground plane; MEBG array; high-gain subwavelength antenna; planar surfaces; ray analysis; resonant cavity antenna; partially reflective surface; MGP; metallodielectric electromagnetic band gap; PRS

Subjects: Microwave materials and structures; Antenna arrays; Other dielectric applications and devices; Waveguide and microwave transmission line components

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