Experiments with the Forbidden Regions of Open Periodic Structures: Application to Absorptive Filters
Birdsall, C.K.; White, R.M.
Microwave Theory and Techniques, IEEE Transactions on
Volume 12, Issue 2, Mar 1964 Page(s): 197 - 202
Digital Object Identifier  
Summary: Experiments with open periodic structures are presented which show a large change in transmission at the transition from allowed to forbidden regions. At the boundaries of the forbidden regions, the radial distribution of the fields of a wave impressed upon the structure changes from one corresponding to slow-wave propagation to a field distribution corresponding to radiation. At these boundaries, the local field shapes do not change very much. However, at the boundary a large decrease in transmission through the structure is found, but with little change in input VSWR; this implies a change from real characteristic impedance to about the same value of radiation resistance. This behavior suggests applications to sharp cutoff absorptive filters.

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