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161_1_Class13

# 161_1_Class13 - EE161 Electromagnetic Waves Spring 2010...

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Unformatted text preview: EE161 Electromagnetic Waves Spring, 2010 Prof. Y. Ethan Wang Electrical Engineering Dept. UCLA Lesson 13 • Dominant Mode in Rectangular Waveguide • Mode Templates Example A rectangular waveguide has a length a = 5cm and width b = 2cm. (1) What is the phase constant , guide wavelength , the phase velocity and group velocity for the dominant mode at 4 GHz. Example A rectangular waveguide has a length a = 5cm and width b = 2cm . (2) Consider a signal propagates along the waveguide with two frequency components at respectively 3.5GHz and 4.0 GHz. They have the same phase at the excitation position; find out how much phase difference between these two components at the observation position which is about 5 cm away from the excitation plane. Example A rectangular waveguide has a length a = 5cm and width b = 2cm. (3) If a 20ns wide pulse modulated on a carrier of 7 GHz is transmitted in the waveguide, at what distance from the excitation plane you may observe two separate pulses? Dominant Modes in Various Waveguides Coaxial Line: TEM mode Parallel Plate Waveguide: TEM mode Rectangular Waveguide: TE 10 mode Circular Waveguide: TE 11 mode Dielectric Slab: TM 1 mode (a>b) The Dominant TE...
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161_1_Class13 - EE161 Electromagnetic Waves Spring 2010...

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