Final Exam Answers for ESE 571

Final Exam Answers for ESE 571 - Answer Solution to ESE 571...

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Answer Solution to ESE 571 Final Exam Submitted by: Vikram Malik 106416398
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Final Exam Answers Answer: 1 Given: Reader transmit power, Pr = 30dbm = 1w Reader antenna gain, Gr = 6dbi = 3.98 Tag power requirement, Pt = -10dbm = 10 -4 w Tag antenna gain, Gt = 1dbi = 1.259 Reader Sensitivity, Sr = -80dbm = 10-11 w Tag backscatter efficiency, Et = -20db = 10-2 w Frequency = 915 MHz = 33 cm = 0.33 m 1(a) Max Range of system: Dmax forward link = [ (Pr * Gr * Gt * λ2) / ( 16 * π2 * Pt) ] ½ = [ (1 * 3.98 * 1.259* 0.33 * 0.33) / (16 * π2 * 10 -4 ) ] ½ = 5.87m Dmax Reverse link = [ (Et * Pr * Gr * Gt * λ 2 ) / (16 * π 2 * Sr) ] ½ = [ ( 10 -2 * 10 -4 * 1.259 * 3.98 * 0.33 * 0.33) / (16 * π 2 * 10 -11 ) ] ½ = 18.58m Now here forward link is the limiting factor thereby the range of system is limited to 5.87m. 1(b) In today’s technology it is not worth to invest in reader sensitivity because as we can see from results above that reader can read back up to 18 mts but the tag will not reply for more than 5.87 mts. So for today’s technology we should reduce the Tag Power requirements in order to increase the range of system.
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1(c) Minimal Tag Power requirement, Pt = -30dbm = 10 -6 w
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Final Exam Answers for ESE 571 - Answer Solution to ESE 571...

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