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how do I calculate micro-strip?

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gribi20

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hi , I'm going to use RO4003C substrate to design coupler 180 deg , that work from 2 to 4 GHz .I got the specification from the internet of the substrate from Rogers Corporation , how do I calculate the dimension of w/d and how to get effective dielectric constant ? to let me able to finish my design .notes plz im beginner
 

DDavid

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in what cad u are working?
 

gribi20

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well, so far I prefer to using manual calculation but I can use linecalc in ADS
 

DDavid

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So if u have ADS u can do it with linecalc...
 

gribi20

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well, I do have this parameters but I think they are not enough to do the rest of calculation
 

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DDavid

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u have all u need

first please define H of the wanted PCB
second T
take from table Er and Tang delta
dont forget to define u freq
and that's it
go to Linecalc...
 

gribi20

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Thatz the question , how to calculate H and T ?
 

DDavid

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U don't calculate
u take what from datasheet, Rogers give u

below to the table that u attached u can find
standard thickness that H
and standard copper cladding it T
 

gribi20

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welll , thank you , but which one should I choose ? and what about Z0?
 

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DDavid

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if u want to design coupler for 2 - 4G
i would start with 32mil substrate 1oz T (1oz if u not going to work with high power signals),
height of the pcb can and will enflunce on your design (like volker_muehlhaus told it will define your line w), but once again 32mil it good start)
Zo depend on your system usually it 50 Ohm.
 

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