coaxial to waveguide adapter

Adapter used to interface coaxial cable with waveguide is referred as coaxial to waveguide adapter. The rectangular waveguide are fed by means of coaxial probe pierced into the wall of the waveguide. The coaxial probe is connected to source of EM waves. To generate TE10 mode, probe is inserted perpendicular or parallel to the maximum E field.

The probe depth(d) in waveguide is kept smaller so that constant current on the probe will radiate EM field inside the waveguide structure. Probe diameter is also kept smaller to avoid generation of higher order modes.

To have radiation only in one direction, short circuit is placed at a distance(l) equal to quarter wavelength in the backward direction. As shown in the figure,both d and l are chosen such that input impedance of the probe can be made pure resistive equal to characteristic impedance of the coaxial line.

coaxial to waveguide adapter

As shown in the figure E fields are perpendicular in both coaxial cable and waveguide structure.


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

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