Half-Mode Substrate Integrated Waveguide Yagi Array with Low Cross Polarization

Abstract

Low cross polarization Yagi array with mirrored arrangement is proposed. First, the half-mode substrate integrated waveguide (HMSIW) and magnetic wall are introduced to realize the miniaturization of Yagi antenna. Simulated results shows that the total area of the Yagi antenna is 1.82λ×0.57λ and the peak gain is about 6.0~7.9 dBi in the 10.5% relative bandwidth. Then the element arrangement of Yagi array composed by the HMSIW Yagi antenna is analyzed to accomplish cross polarization elimination. It is found that the mirrored arrangement eliminates the far field cross-polar component and leads to the lower cross polarization than the other non-mirrored arrays under the condition that they have almost the same bandwidth, peak gain and beam direction. The low cross polarization four-element array with mirrored arrangement is fabricated and measured, and experimental results agree well with the simulation.