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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 typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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LCP for Microwave Packages and Modules
RF Cafe Quiz #47

All 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!

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Note: Some material based on books have quoted passages.

LCP for Microwave Packages and Modules - RF Cafe Featured Book

This quiz is based on the information presented in LCP for Microwave Packages and Modules, by Anh-Vu H. Pham, Morgan J. Chen, and Kunia Aihara.

1. What does LCP stand for?

a) Longitudinal Coaxial Packaging
b) Lateral Coaxial Packaging
c) Low-Loss Chimeral Packaging
d) Liquid Crystal Polymer

2. What does "liquid crystal" mean?

a) A phase of matter that has partly solid and partly liquid properties
b) A crystal in the liquid phase
c) A liquid in the crystal phase
d) A generic name for user informational displays

3. What are the advantageous electrical properties of LCP material?

a) Low dielectric constant and loss tangent
b) Low DC resistance and high inductance
c) High dielectric constant and loss tangent
d) High DC resistance and high inductance

4. How is LCP used in microwave and mm-wave circuits?

a) As a conductor
b) As a semiconductor
c) As a substrate for printed circuits
d) As a heat dissipation plate

5. What is the maximum ratio of die size to package size for a chip-scale package (CSP)?

a) 1.0
b) 1.2
c) 1.5
d) 1.7

6. What is an advantage of using lumped element embedded capacitive coupling on an LCP substrate?

a) Space savings
b) Lower insertion loss
c) Eliminates the need for a feedthrough via
d) Reduces the number of layers

7. What happens to common-mode signals at the single-ended output port of an ideal balun?

a) They double in amplitude and are transmitted through the port
b) They halve in amplitude and are transmitted through the port
c) They are completely transmitted through the port
d) They are completely reflected back away from the port

8. What is a primary advantage of a long time delay (LTD) line over a phase shifter when used in pulsed power applications?

a) LTD line is inherently wideband
b) LTD line is inherently narrowband
c) LDT line is lossier
d) LTD line is less lossy

9. What property of LCP material make it good for hermetic packaging?

a) High heat absorption
b) Ultra-low moisture absorbtion
c) Strong as diamond
d) It floats

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

Posted 10/18/2012

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LCP for Microwave Packages and Modules RF Cafe Quiz #47

LCP for Microwave Packages and Modules
RF Cafe Quiz #47