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Microstrip Lines and Slotlines
RF Cafe Quiz #50

RF Engineering Quizzes - RF CafeAll RF Cafe Quizzes make great fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job. Bonne chance, Viel Glück, がんばろう, buena suerte, удачи, in bocca al lupo, 행운을 빕니다, ádh mór, בהצלחה, lykke til, 祝你好運. Well, you know what I mean: Good luck!

Click here for the complete list of RF Cafe Quizzes.

Note: Some material based on books have quoted passages.

Microstrip Lines and Slotlines - RF Cafe Quiz #50This quiz is based on the information presented in Microstrip Lines and Slotlines, by Ramesh Garg, Inder Bahl, and Maurizio Bozzi.

Graciously provided by Artech House

 

 

 

 

 

 

1.  What is a principal requirement for a transmission structure to be suitable as a circuit element in a microwave integrated circuit (MIC)?

a)  It needs to be rectangular

b)  It must be copper plated

c)  It is usually much wider than it is long

d)  It should be planar in configuration.

2.  What are two consequences of the non-TEM behavior of microstrip lines?

a)  Effective dielectric constant and impedance are functions of frequency

b)  A lower cutoff frequency is established, like with waveguide

c)  An upper frequency is established due to the critical angle

d)  Their combined effects are negligible

3.  Which of the three drawings below represents the highest performance method of transitioning from coaxial connector to microstrip?

Coaxial connector to microstrip transition (straight inline) - RF Cafe(a)          Coaxial connector to microstrip transition (right angle) - RF Cafe(b)          Coaxial connector to microstrip transition (tapered) - RF Cafe(c)

a)  Straight inline transition

b)  90° transition

c)  Tapered transition

d)  All perform the same

4.  What is full-wave analysis?

a)  Field analysis invoking quasi-static approximations

b)  Field analysis not invoking quasi-static approximations

c)  Field analysis that include a full wavelength of the lowest frequency

d)  Field analysis that include a full wavelength of the highest frequency

5.  What happens to the temperature of microstrip as the frequency increases?

a)  Thermoelectric dispersion causes cooling

b)  Eddy currents in the metal cause heating

c)  Dielectric heating causes a temperature rise

d)  Frequency has no effect

6.  What are examples of discontinuities in microstrip?

a)  Open ends and gaps

b)  Steps in width and right-angle bends

c)  T and cross junctions

d)  All the above

7.  Where does the wave propagate in a slotline?

a)  Along the slot

b)  Perpendicular to the slot

c)  Above the slot

d)  Below the slot

8.  What is a Defected Ground Surface (DGS)?

a)  An artifact of imperfect substrate fabrication

b)  A discontinuity caused by thermal stress

c)  An intentional deviation from a continuous flat ground plane.

d)  A ground plane that goes over to "the other side"

9.  What is the distinguishing feature of a coplanar waveguide?

a)  All elements are collocated in the substrate stack

b)  All elements are collocated on the same surface of the substrate

c)  The waveguide is formed by etching a 3-dimensional channel in the substrate

d)  The waveguide section soldered to the substrate inline with the microstrip or stripline

10.  What is the name given to a configuration whereby two transmission lines are placed parallel to each other and in close proximity?

a)  Coupled line

b)  Isolated line

c)  Guard band structure

d)  Capacitor

Need some help? Click here for the answers and explanations.

Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes

Posted  6/17/2013
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    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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