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1.	Which of the following is the drawback of smart antenna?(a) Design of trans-receiver(b) Spacing between base stations(c) Probability of collisions being reduced(d) Focused to an intended directionI have been asked this question during an interview for a job.The doubt is from Smart Antennas in division Smart Antennas of Antennas
Answer» Right option is (a) DESIGN of trans-receiver To EXPLAIN: Design of trans-receiver is a complex when compared to the traditional base station trans-receivers because separate trans-receiver chains are NEEDED for each array elements. Probability of collision reduction, focusing on desired direction is the BENEFITS of SMART antenna.

2.	Smart antennas can be used for location-specific service.(a) True(b) FalseThis question was posed to me in semester exam.My doubt stems from Smart Antennas in section Smart Antennas of Antennas
Answer» Right OPTION is (a) True For explanation I would SAY: The spatial DETECTION nature of the SMART antenna enables to locate humans in emergencies. It is used for location-specific services.

3.	In which of the following type of smart antenna, the performance of the multi-channel fading is limited?(a) Diversity system(b) Omni-directional system(c) Sectored system(d) Directional systemI have been asked this question by my college professor while I was bunking the class.The origin of the question is Smart Antennas in portion Smart Antennas of Antennas
Answer» Correct option is (a) DIVERSITY system To elaborate: In Diversity system, multi-path fading, co-channel interference, delay spread impairments are GREATLY reduced in smart antennas. DIRECTIONAL system uses sectored antennas reference to PROVIDE the energy to INTENDED direction.

4.	Which of the following is mostly used to generate multiple fixed beams by augmentation in specific orders?(a) Switched Beam array(b) Range gates(c) Conical Scanning(d) FMCW radarI had been asked this question by my college professor while I was bunking the class.The question is from Smart Antennas topic in section Smart Antennas of Antennas
Answer» RIGHT option is (a) SWITCHED Beam array Explanation: Switched beam is USED for forming multi rays in specific orders. Range gates and delay LINE cancellers find applications in MTI radars to get the accurate target information. In CONICAL scanning continuous scanning is performed by beam.

5.	Which of the following is benefit of smart antenna?(a) It is easy to tap the connection by the intruder apart from the user(b) Co-Channel interference is less compared to the Omni-directional(c) Design of Trans-receiver is complex(d) It cannot be used for location-specific servicesThe question was posed to me by my school teacher while I was bunking the class.I'd like to ask this question from Smart Antennas topic in division Smart Antennas of Antennas
Answer» Right choice is (b) Co-Channel interference is less compared to the Omni-directional The best explanation: The spatial detection NATURE of the smart antenna enables for LOCATION SPECIFIC services. Probability of COLLISIONS is reduced so the inference is ALSO reduced in smart antennas. Thus the Signal to interference (SIR) increases in this. Smart antennas provide security so it is difficult for the intruder to get the user connection.

6.	Which of the following is not the benefit of smart antenna?(a) It increases the SIR(b) It decreases the SIR(c) It increases the SNR(d) Probability of collisions is reducedI got this question in an online quiz.This interesting question is from Smart Antennas topic in division Smart Antennas of Antennas
Answer» Right answer is (b) It decreases the SIR The best explanation: Probability of collisions is REDUCED so the INFERENCE is also reduced in smart antennas. Thus the Signal to interference (SIR) increases in this. The SNR is also HIGH as the multipath fading is also reduced N diversity type system.

7.	Which of the following is used to distinguish the selected signal and the multipath signal in smart antenna architecture?(a) DSP procedure(b) Switched beam array(c) Range gates(d) Delay CancellersI had been asked this question in examination.I need to ask this question from Smart Antennas topic in portion Smart Antennas of Antennas
Answer» The correct answer is (a) DSP procedure Easy EXPLANATION: Adaptive ARRAY SYSTEM change the sign patterns with respective to RF settings. DSP procedure is used to differentiate the selected SIGNAL from the multipath signals. Switched beam is used for forming multi rays in specific orders. Range gates and delay line cancellers FIND applications in MTI radars to get the accurate target information.

8.	Which of the following suffers the co-channel interference most?(a) Smart antennas(b) Sectored antennas(c) Omni-directional(d) Both Smart antenna and Omni-directionThe question was posed to me during an interview.Origin of the question is Smart Antennas in division Smart Antennas of Antennas
Answer» Correct CHOICE is (c) Omni-directional For explanation: Omni-directional suffers more co-channel interference compared to the sectored and smart ANTENNAS. Probability of collisions is reduced so the inference is ALSO reduced in smart antennas. Thus, the Signal to interference (SIR) INCREASES.

9.	Which of the following statements is false regarding smart antenna for 802.11 applications?(a) Coverage area is increased(b) Signal paths are reduced(c) Probability of collisions is increased(d) Interference is reducedThe question was asked by my school teacher while I was bunking the class.Question is from Smart Antennas topic in section Smart Antennas of Antennas
Answer» The correct OPTION is (c) PROBABILITY of collisions is increased For explanation I WOULD say: Smart antenna allows IMPROVED SNR so coverage area is also increased. The signal paths are reduced so the multi-path reduction, the transmitted RF energy is confined to a desired direction so interference is reduced. Probability of collisions is reduced and network capacity is increased.

10.	Which of the following statement regarding smart antenna is false?(a) Design of transceiver is complex(b) Smart antennas is more directive(c) Smart antenna is more expensive(d) Numeric processors and control systems are not needed in smart antennasI got this question in an interview for job.This question is from Smart Antennas topic in chapter Smart Antennas of Antennas
Answer» Correct choice is (d) Numeric processors and CONTROL systems are not needed in smart antennas The explanation: Compared to the traditional base station trans-receivers, DESIGN of trans-receiver is a complex because there is a need of SEPARATE trans-receiver chains for each array elements. Smart antennas are more DIRECTIVE and costly. The base stations need very powerful numeric processors and control systems.

11.	In Smart antennas, signal to interference ratio is low.(a) True(b) FalseThe question was asked in exam.The origin of the question is Smart Antennas topic in section Smart Antennas of Antennas
Answer» The correct choice is (B) False Explanation: PROBABILITY of COLLISIONS is reduced so the inference is also reduced in SMART antennas. Thus the Signal to interference (SIR) increases in this by INCREASING the signal strength and reducing the interference.

12.	Which of the following is not the advantage of smart antenna?(a) Range is increased(b) Secured transmission(c) Design of trans-receiver is simple(d) Probability of collisions is reducedThis question was posed to me in a job interview.This interesting question is from Smart Antennas in section Smart Antennas of Antennas
Answer» Right CHOICE is (c) Design of trans-receiver is simple To explain: The design of trans-receiver for a SMART antennas is quite complex than a traditional base station trans-receiver. Secured transmission, increase in range, REDUCTION in PROBABILITY of collisions is benefits of smart antenna.