lecture0826 - x School of Electrical and Computer...

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School of Electrical and Computer Engineering, Cornell University ECE 4880: RF Systems Fall 2015 Lecture 08/26/2015 Reading Assignments: 1. Syllabus 2. ECE 3030 patch-up: Maxwell equations (Note 1 and Note 2 of ECE 3030) Lecture Flow: 1. Radio: radiation (wireless transmission) of electromagnetic energy through space Carry information through amplitude, frequency and phase modulation: The mobile revolution in the last 20 years Transmitting energy: Tesla machine, microwave heating, RFID, etc. Imaging: radar, MRI, etc Large range of control 90 dBm (TV, radar transmission) 1MW 7,000V on 50 antenna -110 dBm (GPS signal from satellite) 10fW 0.7µV on 50 antenna 2. Walk through syllabus: what the class will and will NOT cover; related courses 3. Sign up on Blackboard: course ID: 17833_2015FA 4. Background knowledge needed: R, L, C and diodes (in the level of ECE 2100): DC, AC, transient, phasor, Bode plots Transmission lines: impedance, traveling wave, phase, dispersion (in the level of ECE 3030) Signal processing: Fourier transforms, channels/filters, noises (in the level of ECE 2200)
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Unformatted text preview: 5. Group activities: Sometime random is better: a case study of time-division multiple access Choose a random number between 1 - 4 in your heart (do not speak out loud). I will count 1…, 2…, 3…, 4… When the number matches, say your first name out loud immediately. Choose the group 2 as a demonstration: repeat the process. Observation: o Why sequential number calling is not in general possible? (Sight) o What is the probability that everyone’s name can be heard without interference? o What happens if two persons ALWAYS choose 2? o What happens if two persons ALWAYS choose 1, 2, 3, 4 as a rotating sequence? Put students to groups of 3 – 4 students o Introduce yourself: My name is Edwin Kan. I am a professor of ECE for 18 years. I like basketball (but bad) and ping pong (reasonable). 1 x o Elect a speaker o What is the coolest application (in 1 or 2 sentences) you can imagine for using radio waves? Say in a hospital, imaging the tornado, contact with aliens, etc. 2...
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