Circuit-slide-26

Circuit-slide-26 - Waveguide Cavity Resonator The cavity...

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Waveguide Cavity Resonator The cavity resonator is obtained from a section of rectangular wave guide, closed by two additional metal plates. We assume again perfectly conducting walls and loss-less dielectric.
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The addition of a new set of plates introduces a condition for standing waves in the z - direction which leads to the definition of oscillation frequencies The high-pass behavior of the rectangular wave guide is modified into a very narrow pass-band behavior, since cut - off frequencies of the wave guide are transformed into oscillation frequencies of the resonator.
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The cavity resonator will have modes indicated as The value of the index corresponds to periodicity (number of half sine or cosine waves) in the three directions. Using z-direction as the reference for the definition of transverse electric or magnetic fields, the allowed indices are The mode with lowest resonance frequency is called dominant mode . In the case a ≥ d > b the dominant mode is the TE 101 .
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Circuit-slide-26 - Waveguide Cavity Resonator The cavity...

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