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Quiz 2 - Microwave Waveguides

For this quiz on microwave waveguides, students are to select, compute, or define the most approaches answer for the given problem. Partial credit will be considered based on the studentís legitimate attempt at solving the problem. Good Luck.

1. At what frequency ranges are waveguides typically used?


2. Why are coaxial cables not used at these frequencies?


3. List two important boundary conditions that must exist in a waveguide?



4. Propagation through a waveguide is in the form of a: (circle all correct answers)

a. TEM wave
b. TE wave
c. TM wave
d. none of the above
e. all of the above



5. If a Transverse Magnetic wave (TM) has a subscript of 1 0, what does the subscript indicate?


6. When the wavelength equals 2a, the 2a is the cutoff wavelength. What does this wavelength represent?


7. What mode is called the dominant mode?


8. Waveguide propagation is due to a wave bouncing off the sides of the waveguide; True or False (circle one)




Answers:

1. The frequency range often associated with waveguides is approximately 3GHz to 30GHz. While this is the "typical" answer provided in lecture, waveguides are often utilized in applications well above 30GHz.

2. Transmission losses are the major issue with coax cables at high frequency.

3. An electric and magnetic field.

4. Choice b and c; the TE wave and TM wave.

5. The 1 represents the one wave per width of the waveguide.

6. 2a represents lambda cutoff, which is the maximum wavelength able to travel down the waveguide.

7. TE10 is the dominate mode.

8. True. Electromagnetic waves that are 2a or less propagate down and are constrained by the physical dimensions of the waveguide.




Engineering key words: Electromagnetic wave propagation, EM, transverse electric and transverse magnetic, wave-front, bounce, modes, cutoff frequency, waveguide, dominate mode, rectangular, circular, limits, conditional, coaxial cable, AWG, width and height, pop quiz.


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