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  1. H

    Need help to design an array antenna

    I have designed an patched array antenna over an electromagnetic band-gap (EBG) surface operating at 3.3–3.8 GHz. Now, I need to design a similar system for the 140 GHz D-band. However, I have never worked at such a high frequency before, so I do not know how to start. I would really appreciate...
  2. H

    Need help

    Can anyone please help me answer these questions? 1. Why do antennas integrated on bulk CMOS substrates typically have low radiation efficiency, and what techniques can be used to improve their efficiency? 2. A 50 Ω on-chip transmission line operates at 140 GHz. Which type of loss is most...
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