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Class11.pdf - EE163A Introductory Microwave Circuits Fall...

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EE163A Introductory Microwave Circuits Fall, 2015 Prof. Y. Ethan Wang Electrical Engineering Dept. UCLA
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Lesson 11 Periodic Structures Analysis of Infinite Periodic Structures Terminated Periodic Structures K- b Diagrams and Wave Velocities Microwave Devices
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Periodic Structures Periodic stubs on a microstrip line Periodic diaphragms in a waveguide •Consist of periodic repetitions of the unit structure •Support slow-wave propagation (slower than the phase velocity of the unloaded line) •Have passband and stopbands determined by the equivalent propagation constants •Other than filters, find many application in antennas and microwave circuits (leaky wave antennas, Frequency selective surface (FSS), Photonic bandgap structure (PBG)….)
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Analysis of Infinite Periodic Structures (1) Unit cell + - + - …… …… z For each adjacent pair, we have, where ( , k is the propagation constant of the unloaded line)
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