Power handling of Quad-Ridge Waveguide

[K&amp#305z&amp#305]

Hi,

I want to design a quad-ridged waveguide. I also need transition, a coaxial feed. How should I choose the waveguide parameters and feeder in order to satisfy power handling?

Thanks

 

[davenn]

what sort of power levels are you wanting it to handle ?

Dave

 

[K&amp#305z&amp#305]

Power rating at one atomosphere in cw for example 400 Watts.

 

[K&amp#305z&amp#305]

Need help..

 

[chiques]

50 Ohm system?

 

[K&amp#305z&amp#305]

50 Ohm system?

Yes, the waveguide will have 50 Ohm Impedance.

 

[chiques]

That's about a 200 V pk-pk system. Tons of low loss cabling that can handle that.

 

[biff44]

you basically have to make sure:
1) at no place along the transmission lines the gaps are so small that it arcs over. This includes when the end is being loaded with ALL expected possible impedances . Ridge waveguide concentrates most of the Efield between the two ridges, and they are typically spaced a small distance apart
2) u have to make sure that any series elements(like the coax center conductor) can handle the RF current

 

[K&amp#305z&amp#305]

Is there any formula, or is it just trial and error method?

 

[biff44]

Yes, the waveguide will have 50 Ohm Impedance.

So...your quad ridge WAVEGUIDE will have a 50 ohm impedance, huh? Better hit the books pal.