Reflection from N-Layer Dipole Array.
Technical rept. Nov 72-Apr 73,
OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB
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Arrays of loaded or unloaded dipoles have found widespread applications as space filters. They can, when properly designed, provide a unity reflection coefficent at one frequency and a smaller than unity reflection coefficient at all other frequencies. The use of several dipole layers is considered in this report, and it is shown that with proper design a multilayer dipole array can have a resonance curve with unity reflection over a band of frequencies and sharp cut-off outside this band. These results are significant to the Air Force since they apply to the design of resonant sub-reflectors and other applications where a resonant reflecting surface may be required. A method for calculating the reflection from an N-layer loaded dipole array is presented. The dipoles in each layer must be identical, but may vary from layer to layer in size, loading, and spacing, provided that conditions for Floquet currents are met. The effects of a thin dielectric substrate are included. Techniques of Butterworth lumped element filter design are applied to the design of n-layer dipole arrays. Butterworth design dipole arrays of 2 and 3 layers were built and measured for various spacings and incidence angles.
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