This is a repository copy of Higher order mode circularly polarized two-layer rectangular dielectric resonator antenna.

A wideband high gain circularly polarized (CP) rectangular dielectric resonator antenna (RDRA) having a frequency range of 21 to 31 GHz is proposed. The RDRA consists of two layers with different dielectric permittivities and has been excited using a cross slot aperture. The proposed antenna offers wide impedance and CP bandwidths of ∼36.5 % and 13.75%, respectively, in conjunction with a high gain of ∼12.5 dBi. Close agreement has been achieved between simulated and measured results.

A wideband high gain circularly polarized layered cylindrical dielectric resonator antenna (DRA) that operates in a higher order mode is proposed in the X-band frequency range. The antenna consists of two dielectric layers having different dielectric constants and radii. The results demonstrate a considerably improved performance as a result of adding the outer dielectric layer, where wider impedance and axial ratio bandwidths have been attained in conjunction with a higher broadside gain of ∼ 14 dBic. A prototype has been built and measured with close agreement between experimental and simulated results.

A wideband high gain three-layer hemispherical dielectric resonator antenna (HDRA) that operates at TE 511 and TE 711 higher order modes is proposed. The HDRA is composed of three layers, which has permittivities of 20, 10, and 3.5. The multilayer structure has been chosen in order to reduce the Q-factor and achieve a wider impedance bandwidth. Cross slot feeding mechanism has been utilized taking into account the excited higher order modes for gain enhancement. The proposed antenna provides an impedance bandwidth of 35.8% over a frequency range of 20.8 to 29.9 GHz in conjunction with a high gain of ∼ 9.5 dBi. The proposed DRA represents the first attempt in utilizing a mm-wave hemispherical DRA.

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