I design two component.
1. A 18 GHz patch antenna which feed by coaxial cable feeding.
2. 18 GHz AMC, which phase 0 at 18GHz.
I want to embed AMC between patch antenna and ground for enhancing the gain.But when i embeded it, the resonant frequency went to 16GHz. So i modified the patch antenna length for adjusting the frequency from 16 to 18 GHz. No matter what i adjust, the frequency still at 16 GHz.
Do anyone know what happen?
I need help!
Thank you
Have a nice day
"How to embed artificial magnetic conductor(AMC) between patch antenna and ground ?" Antenna can be placed on AMC using some Prepregs. it is not like the case of PEC, we need to maintain some specific distance between antenna and ground for constrictive phase adding ( In AMC reflection phase are in phase). For 18 Ghz case we need to optimize . This not for constrictive phase adding but when you use probe feed patch and you add Prepregs in that case some length of center conductor is extra present which act as extra series inductance which need to be neutralize by adding a small concentric space on the patch side between probe feed point and patch. it act as capacitance which may neutralized the inductance.
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