waveguide transitions
As we know that rectangular waveguide supports dominant mode TE10 and circular waveguide supports TE11 mode. The device which converts from one mode to the other and vice versa is called transition. In this case it is called as rectangular to circular waveguide transition. Minimum length of this transition is kept about quarter wavelength long. This helps avoiding generation of higher order modes.
Typically length of entire device is kept greater or equal to about twice of waveguide wavelength(λg). Both E plane and H plane corners and bends help alter direction of the EM wave guiding structure. These structures produce discontinuities and as a result produce reflected waves. This reflected waves from both the sides of the waveguide walls are cancelled by keeping mean length between the junction of corners equal to odd multiple of quarter wavelength.
Discontinuities in the waveguide bend is reduced by keeping minimum curvature radius of E band equal to about 1.5b and H bend equal to 1.5a.
Waveguide twist is used to change polarisation of wave by 90 degree. Length of the twist is kept equal to odd multiple of quarter wavelength.
WAVEGUIDE RELATED LINKS
RF Switch basics and applications along with manufacturers of RF switch refer following link:
RF Switch
For types of waveguide viz. rectangular & circular, waveguide propagation modes, impedance matching of waveguide read following waveguide tutorial.
waveguide basics tutorial
Manufacturers of waveguide components such as waveguide to coaxial adapter, coupler, flanges, gasket, tees, termination, shorts, isolator, circulator, horn antenna, attenuator, feed-thrus, bends, loads, twists, straights, pressure windows, transformers, sliding short circuits, fixed short circuits, sliding mismatches etc. visit following link.
Waveguide components manufacturer
Rectangular waveguide dimensions as per USA standard including frequency, broad dimension and narrow dimensions, visit following link.
Waveguide dimensions table
This article describes microstrip line basics and mention types of microstrip lines and their advantages.
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