beamwidth

Articles in this series Phased array antenna — an introduction Electronic scanning arrays Grating lobes in electronic scanning (this article) Array pattern multiplication Introduction A uniform array samples the aperture field at equal intervals. Sample too coarsely and the far-field pattern aliases—the same idea as undersampling a time signal. The aliases show up as grating … Read more

Articles in this series Phased array antenna — an introduction Electronic scanning arrays (this article) Grating lobes in electronic scanning Array pattern multiplication Introduction Suppose the antenna cannot move — a radar on a mast, a panel on a tower — but you still need the beam to point somewhere else. That is electronic scanning: … Read more