Discussion
Why must a radome over a patch array be designed rather than simply added?
Answer: A
A dielectric layer close to a patch alters the fringing fields, shifts the resonant frequency and can act as a partially reflecting surface, so the antenna must be designed with the cover in place. Fitting one afterwards routinely detunes an array. Moisture, mechanical loading and grounding are real concerns handled separately. Anything placed within a fraction of a wavelength of a radiating structure becomes part of it, which is a good general rule for printed antennas.
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