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Copyright: 1996 - 2024

Webmaster:

    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 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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Introduction to Antenna Analysis Using EM Simulation

RF Cafe Quiz #40

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!

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Note: Some material based on books have quoted passages.

 

RF Cafe Quiz #40 - Introduction to Antenna Analysis Using EM SimulationThis quiz is based on the information presented in Introduction to Antenna Analysis Using EM Simulation, by Hiroaki Kogure, Yoshie Kogure, and James C. Rautio, published by Artech House. It is written for novice engineers and engineering students. This easy-to-comprehend resource offers readers thorough introductory-level treatment of antenna analysis using electromagnetic (EM) simulators. This richly-illustrated book shows how to use EM software to analyze and tune wireless antennas to meet specific requirements. Readers learn important wireless antenna design terminology and gain a detailed understanding of how antennas work. Moreover, the book offers guidance in troubleshooting problems with wireless antenna designs.

Note: Sonnet Lite is a free download provided by the Sonnet company, of Syracuse, NY.

 

1.  What was the James C. Ratio's first antenna design program?

a)  AntDes

b)  Annie

c)  JimAnt

d)  RadPat

 

 

2.  Just exactly what is an antenna?

a)  Any metal structure

b)  Any non-metallic structure

c)  Any structure that performs the function of transmitting and receiving electromagnetic waves.

d)  The little feely thing on the bugs' heads

 

 

Near-field / far-field transition - RF Cafe3.  Where is the approximate location of the near field / far field transition?

a)  λ/10 from the antenna

b)  λ/2 from the antenna

c)  1λ from the antenna

d)  2λ from the antenna

 

 

4.  What does a time-varying magnetic field generate?

a)  An electric field

b)  An orthogonal magnetic field

c)  An amplitude modulated gravity wave

d)  Cancellation of all fields

 

 

5.  What is the impedance of a minimum-loss coaxial cable with an air dielectric?

a)  25 Ω

b)  50 Ω

c)  75 Ω

d)  100 Ω

 

 

6.  How is dielectric material modeled in an EM simulator?

a)  Series RC

b)  Parallel RC

c)  Series RL

d)  Parallel RL

 

 

7.  What happens to magnetic flux if current through the loop is doubled?

a)  It also doubles

b)  It increases as the square of the current

c)  It increases as the square root of the current

d)  It increases as the 4th power of the current

 

 

8.  For an input power of 1 W, what is the output power of a lossless passive antenna with a specified gain of 3 dB or 6 dB?

a)  1/2 W and 1 W, respectively

b)  1 W for both gains

c)  2 W and 4 W, respectively

d)  3 W and 6 W, respectively

 

 

9.  Where does a log-periodic antenna get its name?

a)  The shape resembles a log with straight branches

b)  It is the dual of the linear antenna

c)  From logarithmic diameter ratios of the radiating elements

d)  From the logarithmic spacing and length of its dipoles

10.  Proper test environments are crucial to reliable EM field measurements as evidenced by what factor in Heinrich Hertz's early experiments?

a)  Nearby AC lighting

b)  Metal buttons on his jacket

c)  Wet wooden roof from a rain storm

d)  A nearby pot bellied stove

 

 

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

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