Hi,
Someone asked me a question " If a phased array is designed for 1 gHz, what will be the radiation pattern if the beam comes at 1.1GHz? I know at 1.1 GHZ the wavelength is different so the radiation pattern might be distorted / less directivity. Is there any other impact? Can someone elaborate please?
If it was designed properly at 1 GHz then it might have less directivity at 1.1 GHz, although the beam will be narrower, but grating lobes will be starting to appear at 90 degrees. However, if the element spacing is a bit less than the maximum allowed at 1 GHz, then you may get a narrower beam and more gain than the design at 1 GHz, and no grating lobes.
Malcolm White Thanks for your reply. Why there will be grating lobes in theta 90? Would you please explain?
Moreover, why I will get narrower beam and more gain @ 1.1 GHz? Not clear to me yet.
Read a book or chapter on antenna basics.
The beamwidth depends on the aperture width in wavelengths.
If the elements are nearly a wavelength apart the array can fire sideways.
- Badges
- Science topic
- Similar topics
- Computer Communications (Networks)
- Simulators