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Advanced RF MEMS
RF Cafe Quiz #36

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.

RF Cafe Featured Book - Advanced RF MEMS, by Stepan LucyszynThis quiz is based on the information presented in Advanced RF MEMS, by Stepan Lucyszyn. This book is full of cool micrographs of actual device geometries. Cambridge University Press is the publisher. Note: Some of these books are available as prizes in the monthly RF Cafe Giveaway.

1.  What does the acronym MEMS stand for?

a)  Micro Electro Mechanical deviceS

b)  Microelectromechanical Systems

c)  Micro Electronic & Mechanical deviceS

d)  Miniature Electromechanical system

2.  Which material is commonly used in RF MEMS for its superior magnetic and thermal

     expansion properties?

a)  Cotton

b)  Tin oxide

c)  Electroplated nickel

d)  Homogenized Strontium

3.  What distinguishes MEMS devices from traditional integrated circuits?

a)  Significantly higher gain for amplifiers

b)  Radiation hardening for space environments

c)  Less expensive to produce

d)  Physical displacement of internal components

4.  Which properties of a MEMS RF switch are

     superior to a solid state RF switch?

a)  Insertion loss and bandwidth

b)  Speed and size

c)  Device packaging

d)  Interconnects

5.  Which properties of a MEMS RF switch are

     inferior to a solid state RF switch?

a)  Insertion loss and bandwidth

b)  Speed and size

c)  Device packaging

d)  Interconnects

6.  What is the purpose of a sacrificial layer during MEMS fabrication?

a)  Faster processing

b)  Cheaper to produce

c)  It appeases the MEMS gods

d)  Allows dry etching to reduce undercutting and erosion common with wet etching

7.  Which application would be perfect for multi-pole, multi-throw MEMS RF switch?

a)  Test matrix measurement setups

b)  Multi-band smartphones

c)  Steerable antenna arrays

d)  All the above

8.  What is the purpose of a "hold electrode?"

a)  To counter induced bias from a strong RF signal power level

b)  To keep the connection from letting go

c)  To prevent arcing

d)  Named after inventor Emmanuel Hold

9.  Which phenomenon is possible in a MEMS device but not in a solid state device?

a)  Shock-induced actuation

b)  Activation due to cosmic rays

c)  Overcurrent fusing

d)  Oscillation

10.  What is zero-level (0-level) packaging?

a)  No encapsulation required

b)  The highest level of clean room for encapsulation

c)  On-wafer encapsulation

d)  Metallic packaging


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

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    Kirt Blattenberger,


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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