Size of a waveguide for a given wavelength

[htg]

Let λ be the wavelength of an EM wave in empty space.
Let a x 0.5*a be the dimensions of the cross-section of the waveguide.
Can I use a = 0.35*λ ?
It should be possible, it corresponds to θ = π/4, where θ is the effective
angle between the long axis of the waveguide and the direction of propagation
of an approximately plane wave.

 

[davenn]

have a look and read here for some waveguide theory

http://www.microwaves101.com/encyclopedia/waveguide.cfm

hopefully it should clear up your understanding :)

Dave