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Lec16Waveguides

# Lec16Waveguides - ECE 488 RF Circuits and Systems Spring...

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1 ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 06/3/27 Lecture 16: 1 Waveguides Baluns Antennas ECE 488 RF Circuits and Systems Spring 2008 Lecture 16 2009/2/25 ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 06/3/27 Lecture 16: 4 Waveguides and their E and M Fields The fields propagate inside the waveguide. The vertical E is maximum in the middle and goes to zero at the left and right walls. To satisfy E t boundary conditions. E H ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 06/3/27 Lecture 16: 5 Standard Sizes of Waveguides Arecibo 430 MHz Wavelength = 70 cm Model #2100 Width = 21” = 53 cm Length = 1500’ = 457 m Power = 2.5 MW (peak) Loss = 0.5 dB, total Total Loss = 272 kW E H ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 06/3/27 Lecture 16: 6 Standard Sizes of Waveguides Arecibo 2180 MHz Wavelength = 14 cm Width = 4” = 10 cm Power = 1 MW (cw) Loss = 0.3 dB per 100 feet 700 Watts in every foot! E H ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 06/3/27 Lecture 16: 7 Shunt Capacitance in a Waveguide Size of wall determines capacitance. Sometimes adjustable with a screw through plate. ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 06/3/27 Lecture 16: 8 Shunt Inductance in a Waveguide Just a little conductive wing attached to the wall.

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2 ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 06/3/27 Lecture 16: 9 Bandpass Filters in Waveguides Equivalent Circuit ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 06/3/27 Lecture 16:10 Multi-Stage Bandpass Filters Configured somewhat like coupled resonator filters with a quarter-wave section in between. λ /4 ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 06/3/27 Lecture 16:11 Waveguide Feed Horns Flare out to merge with the impedance of free space. Picture? ECE 488 – RF Circuits and Systems – Spring 2009 Swartz 06/3/27 Lecture 16:12 Series Waveguide Tees Obvious after a little thought. See text for series Tees.
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Lec16Waveguides - ECE 488 RF Circuits and Systems Spring...

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