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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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Chipless RFID Reader Architecture
RF Cafe Quiz #53

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.

Chipless RFID Reader Architecture - RF Cafe

This quiz is based on the information presented in Chipless RFID Reader Architecture, by Nemai Chandra Karmakar, Randika V. Koswatta, Prasanna Kalansuriya, and Rubayet E-Azim.

Graciously provided by Artech House

1. What is a major advantage of chipless RFID over existing RFID?

a) Increased read range
b) Lower cost
c) Increased sensitivity
d) All the above

2. What is a name given to fully printable, passive microwave and millimeter-wave chipless RFID tags?

a) PPMM arrays
b) Radar arrays
c) Sonar arrays
d) Inverse arrays

3. What is the assigned frequency (or band) on (within) which RFID systems must operate?

a) 13.65 MHz
b) UHF / VHF bands
c) 2.4 GHz ISM band
d) There is no specific assigned frequency / band

4. What type(s) of frequency domain based RFID tags are currently in use?

a) Chemical tags
b) Space-filling tags
c) Dipole array tags
d) All the above

5. What is the common name given to the device that performs the interrogation of an RFID system?

a) A reader
b) A broadcaster
c) A transponder
d) A pinger

6. What is / are the current limitation(s) of chipless RFID readers?

a) Reader cost
b) Read range
c) Reading speed
d) All the above

7. What is a rectenna?

a) A back-end antenna
b) A rectangular antenna for efficient square wave reception
c) A rectifying antenna that converts a microwave signal into DC power
d) No such thing

8. What type of antenna is shown to the right?

a) Left-hand polarized
b) Right-hand polarized
c) Circular log periodic
d) Fractal

9. What is the most basic antenna that can yield omnidirectional radiation patterns over a UWB (ultra wide bandwidth) band?

a) Disk-loaded monopole
b) Biconic
c) Standard feedhorn
d) 1/2-wave dipole

10. How can smart antenna technology mitigate the interference problem of RFID reading?

a) With artificial intelligence (AI)
b) With electronic beam steering
c) With dumb tag exploitation
d) With ultra high power interrogation

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

Posted September 25, 2013

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Chipless RFID Reader ArchitectureRF Cafe Quiz #53

Chipless RFID Reader Architecture
RF Cafe Quiz #53