Coplanar Waveguide question

[jgraygoza]

This question is mostly a "how possible" is to build one.
I am working on a switch and on a separate post I state my problem.
But for this one, I am just curious to know.
If I am to build an SP2T switch, broadband (0.2 GHz ~ 18 GHz), is it a good choice to use coplanar waveguide?
Or should I stick to microstrip?

Right now, I don't have a size limitation.
I can deal with that later.
First I need to grab the concept correctly.
Do I start from the Fc and from there build the transmission lines?
Also, if I am to simulate coplanar, how close to reality will the simulation be?

I know that the main focus is that the lines are quarter wavelength lines, correct?
And from there, work my way into the band.
My simulation software is MWO.

Thank you very much for reading my post.

 

[tony_lth]

I recommend to use microstrip, it's easy to solder components, and has very good ground property.

- - - Updated - - -

I recommend to use microstrip, it's easy to solder components, and has very good ground property.

 

[jgraygoza]

Microstrip.....Ok....
So I will have to stick ot it then.
Microstrip on a 5880 Duroid.
You mention grounding.
I am building such board and I intend to go high in frequency,
do you suggest a make a housing for better grounding?
I ask this because I wouldn't want to machine something for nothing.

Thank you for the suggestion.

 

[vfone]

For this wide frequency range I would go for CPW.
CPW has a zero cut-off frequency which gives wideband characteristic, when Microstrip line is dispersive vs frequency, thus with increasing frequency, phase velocity and characteristic impedance it will change slightly.

 

[tony_lth]

You can use some tools such as TXline to calculate the dispersity vs. freq. You need to determine if you can accept the dispersity.