Which substrate to use for integrated antenna and microwave circuit?

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hsnumr

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Hi all!

I have to design a planar antenna and microwave power amplifier integrated on a "single substrate". My design frequency is 2.45 GHz. Which substrate would be better:
Fr4 Epoxy (4.4) or Rogers RT Duroid 5880 (2.2) ??

Your kind help is highly regarded.
 

hi hsnum
the Er may change at 2.45Ghz if using FR-4.
 
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    hsnumr

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Thanks jiripolivka and Tomsin yin.
 

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