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The present report examines both analytically and numerically by using a two-dimensional electromagnetic solver the frequency tuning characteristics and electric-field patterns in a two-celled system consisting of cylindrical cavities coupled by a circular iris. It is shown that the presence of the iris introduces unique features not found in hollow circular cavities, namely, the occurrence of flat...
The main purpose of this work was to measure the resonant frequency and the Q-factor for the niobium superconducting reentrant cavities to be used in parametric transducers of the gravitational wave detector Mario Schenberg. Many cavities were manufactured from niobium with high tantalum impurities (1420 ppm) and they were cryogenically tested to determine their resonance frequencies and unloaded...
Microwave propagation in a metallic waveguide loaded with an array of split-ring resonators is examined both analytically and experimentally. The synthesized combined medium exhibits a frequency band around 6.0 GHz with simultaneously negative values of permittivity and permeability which allow transmission in an otherwise forbidden band for the hollow waveguide.
Including a coaxial circular insert separated by a gap spacing from the cavity end, reentrant cavities with dimensions conveniently small can operate at large wavelengths, thereby finding direct application in klystron cavities for low frequencies. It is illustrated that a reentrant cavity 8.0 cm in diameter, loaded with a coaxial insert of radius 2.0 cm and a 2.0 mm gap spacing, resonates at a 30...
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