Abstract
A Substrate Integrated Waveguide (SIW) planar array is presented using a right handed circularly polarized (RHCP) element with four crossed tilted radiating slots. In addition, a pair of metallic tuning vias is included to really improve the re∞ection of longest slots. A corporate feeding network over SIW has been designed for distributing the input signal to 128 radiating elements, divided into 8 progressive wave linear arrays of 16 elements each. The designed planar array has been manufactured and measured to verify the antenna performance. 25.5dB gain, 2.33dB axial ratio, as well as 85% radiation e-ciency values have been experimentally achieved at 17GHz. A 3% usable bandwidth (16.75{17.25GHz) is obtained due to the typical frequency main beam tilt dispersion in the elevation plane of the progressive wave arrays.
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