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I would like to design a 3GHz high gain antenna. S11 has to be below -10dB and the gain to be above 9dBi - and I want to make it smaller than 8cm.

What kind of antenna is better to satisfy the condition?

It doesn't matter about the antenna type, but I hope it will be a patch antenna.

Please recommend an antenna specification.

JRE
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Churus
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    So you want a high-gain antenna (9dB) where the wavelength is 10cm. Do Yagis perform well? – analogsystemsrf Jun 09 '19 at 04:45
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    What are you going to do with the antenna? Why aren't commercial antennas acceptable? Have you looked for commercially available antennas to see what is possible? – JRE Jun 09 '19 at 08:45

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