How to shorten Microstrip line

Hi,

I need help in shortening the length of the microstrip line.

Supposingly I need to have a microstrip line which give me a 8ns of delay in the 300MHz frequency. Then I will need to have a very long microstrip line to obtain that.

Any ways or methods that I could use to shorten the length while maintaining the 8ns delay?

Thanks for the help. :)

Use the highest dielectric constant available?

Use Germanium material, with Er=16, then 8ns=2.4T at 300MHz, substrate H is 2mm, 1/2oz for copper, so the length is 758.119mm. You can turn around it in the PCB.

---------- Post added at 05:36 ---------- Previous post was at 04:47 ----------

Use some similiar phase shifter circuit: input port shunt L=3.54nH and C=79.27pF both to GND, then after a 10mm microstrip line, then L and C with same value both shunt to GND again. Substrate RO4350B with 10mil/0.5oz.

Why don't you meander it ? By meandering your line like a "S" you can reduce the length and mantaining the same substrate

May I know, what is the effect of the signal when we do this?

-Kellyza-

Almost Same effect with one straight line, if two lines are not too closer.

Thanks tony_lth... meaning we can simply meander the lines as long as the lines far enough each other so that no interference occurs. Usually how far/space should be between adjacent lines?

Thanks again
-Kellyza-

you can simulate it, when coupling is <-30dB, I think that's OK.

ok... thanks for the explanation. I got it...

-Kellyza-

Have tried using the highest dielectric substrate, it is still consider quite long.

---------- Post added at 09:29 ---------- Previous post was at 09:27 ----------

Thk... I will try using this method. :)

You can load the end of your line with capacitors, too.