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losses in microstrip line

Manjuladevi

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HI all, I'm a researcher, i'm getting an error, when i was simulate 100 mm,er-2.55,-50 ohm transmission line from (500 Mhz to 6 GHz), im getting an insertion loss for 2.5 GHz will be -0.1 dB but practically i haven't getting that result. I got -0.35 db. what is the loss behind in it, and also i have cross verified calibration and SMA soldering.
please help me!
 

vfone

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100mm (10cm) is a long microstrip circuit working at 2.5GHz. Small variations (from the simulated ones) of dielectric constant, dissipation factor, substrate height, trace width, strip discontinuities, would affect the final instertion loss.

I don't know what substrate you are using, but if is about Arlon AD255, this one should be a good quality substrate, with very small variations of parameters from low frequencies up to 10GHz.
At 500MHz and at 6GHz, how is the insertion loss compared to simulation?
 

BigBoss

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Another additional error mechanism is -seen frequently- Manufacturing Errors.
 

Manjuladevi

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100mm (10cm) is a long microstrip circuit working at 2.5GHz. Small variations (from the simulated ones) of dielectric constant, dissipation factor, substrate height, trace width, strip discontinuities, would affect the final instertion loss.

I don't know what substrate you are using, but if is about Arlon AD255, this one should be a good quality substrate, with very small variations of parameters from low frequencies up to 10GHz.
At 500MHz and at 6GHz, how is the insertion loss compared to simulation?
I have compared S21 from simulated and measured from VNA
 

ktr

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To check for manufacturing errors, you may need to inspect the board with a camera system. Check that the traces have the correct width as intended; sometimes when traces are long; width of the line may change.
 

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