| Resumen | A Substrate Integrated Waveguide (SIW) planar array is presented using a circularly polarized (CP) four crossed tilted radiating slots. In addition, a pair of metallic tuning vias is included to really improve the reflection of longest slots. A corporate feeding network over SIW has been designed for distributing the input signal to 128 radiating elements, divided into eight 16-elements progressive wave linear arrays. The designed planar array has been manufactured and measured to verify the antenna performance. 25.5 dB peak gain, 2.33 dB axial ratio and 85% radiation efficiency values have been experimentally achieved at 17 GHz. Although the specified operation band is 16.3 to 17.7 GHz (Ku band), a 3% usable bandwidth is obtained due to the typical frequency main beam tilt dispersion in the elevation plane of the progressive wave antennas. |
