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Answers to RF Cafe Quiz #47

RF Engineering Quizzes - RF Cafe WebsiteAll 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.

Return to RF Cafe Quiz #47

LCP for Microwave Packages and Modules - RF Cafe Featured BookThis 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?

d)  Liquid Crystal Polymer

Liquid crystal polymer (LCP) is a plastic material with barrier properties similar to ceramic crystal.

(see page 1)

 

2.  What does "liquid crystal" mean?

a)  A phase of matter that has partly solid and partly liquid properties

(see page 17)

 

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

a)  Low dielectric constant and loss tangent

(see page 20)

 

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

c)  As a substrate for printed circuits

(see the entire book)

 

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

b)  1.2

As defined in IPC/JEDEC J-STD-012, chip-scale packaging (CSP) refers to a packaging method where the final package area dimensions are no larger than 1.2 times the die.

(see page 72)

 

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

c)  It eliminates the need for a feedthrough via

The lumped element capacitor inherently blocks DC and eliminates the need for a via. A disadvantage is that lumped element printed capacitors are physically large.

(see page 132)

 

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

d)  They are completely reflected back away from the port

Common-mode signals are completely rejected and reflected back from a lossless balun since only differential signals are converted to single-ended signals and allowed transmission.

(see page 166)

 

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

Unlike a phase shifter, LTDs are inherently wideband and thus are ideal for pulse transmissions on phased array antenna systems.

(see page 193)

 

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

b)  Ultra-low moisture absorption

LCP material has ultra-low moisture absorption and permeation close to that of glass.

(see page 226)

Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, Radio-Electronics, 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
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About the RF Cafe™ Website ©1996-2026

Kirt Blattenberger - RF Cafe WebmasterRF 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 lady's voice announced "You've Got Mail" when a new message arrived...

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