Antennas and Site Engineering for Mobile Radio NetworksRF Cafe Quiz #51

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!

Note: Some material based on books have quoted passages.

This quiz is based on the information presented in Antennas and Site Engineering for Mobile Radio Networks, by Bruno Delorme.

Graciously provided by Artech House

The book is divided into three sections: the first section describes the functioning of all types of antennas used in mobile phone networks and provides examples of each; the second part delves into the engineering of antenna sites, which is crucial to the quality of mobile networks; the third part of the book includes refresher information on the mathematics and physics necessary to understand the content of the book and put it to practical use in actual applications. The book is packed with clear explanations and recommendations for avoiding problems and making the best antenna and site decisions.

1.  In Coulomb's Law, F = m x m' / 4πεr2, what are m and m'?

a)  Two masses

b)  Two magnetic domains

c)  Two electric charges

d)  Two general physical entities

2.  With what phenomenon did James Clerk Maxwell compare electromagnetic wave propagation?

a)  A stone dropped into a pond

b)  A flickering candle

c)  A sonic boom

d)  An ant's wanderings

3.  What did Edouard Branly use as the amplification element of his 'radio conductor' detection device?

a)  Germanium

b)  Silicon

c)  Iron filings

d)  Cat's whisker

4.  What is the Poynting Vector?  (Wikipedia page for Poynting Vector animation)

a)  A vector that points in the direction of the electric (E) and magnetic (H) fields

b)  A vector always pointing in the direction of least RF resistance

c)  The pathogen-transmitting organism that famously infected physicist John Henry Poynting

d)  The vectorial product of the electric (E) and magnetic (H) fields at a given point

5.  What is the defining feature of a panel antenna?

a)  Is uses a conductive panel behind the antenna array for providing directivity

b)  It uses a panel of antennas

c)  It is an antenna shaped like flat panel

d)  It is an antenna shaped like parabolic panel

6.  Which of the following factors affect the radiation pattern of an antenna mounted on a pylon or mast?

a)  Type of support (pylon or tubular mast)

b)  Antenna distance from the pylon or tubular mast

c)  Cross-section of the pylon or tubular mast

d)  All the above

7.  In order to isolate co-located antennas with vertical polarization, which of the two minimum separation distances are required.

a)  λ/4 in the vertical and the horizontal

b)  λ in the vertical and 3λ in the horizontal

c)  10λ in the vertical

d)  10λ in the horizontal

8.  What are the main sources of noise from transmitter?

a)  Harmonic distortion and oscillator phase noise

b)  Noise in the modulating signal

c)  Passive intermodulation (PIM)

d)  Wind-induced Doppler from swaying antenna

9.  What type of illumination must a parabolic reflector utilize for proper operation?

a)  Left-hand circular polarization

b)  Right-hand circular polarization

c)  Spherical wave

d)  Trapezoidal wave

10.  Which governing body is responsible for worldwide frequency coordination?

a)  The Université de Intercontinental Teleportation (ITU)

b)  The International Telephone Users (ITU)

c)  The Interdenominational Telecommunications Union (ITU)

d)  The International Telecommunications Union (ITU)