Cylindrical transmission cavity

Microwave transmission through a cylindrical resonant cavity is used to study high density (.—1013 e cm. 3) low temperature (0.025 e.v. 

Zhang et al. (1991) published a relatively simple transmission XAFS cell in 1991. Their design incorporated a cylindrical body with sealed Kapton windows at each end through which the reaction gas flowed. A heating coil was wrapped around the cylinder, and a liquid nitrogen vessel provided cooling of the sample. The sample was mounted on an insert and sealed on the holder with Kapton tape. This insert was placed inside the cylindrical cavity. It is not clear from the description provided how the gas in the cylindrical cavity made contact with the catalyst in the sample holder. 

Of equal importance for modern EMC structures are the circularly shielded multiconductor transmission lines and the cylindrical cavity-backed apertures of Figure 7.18. Due to their wideband function range, the former are found to be very useful in the construction of ultra-bandwidth microwave elements, junctions, and couplers, while the latter are commonly involved in the solution of penetration or shielding problems. 

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