1. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University Engineering Electromagnetics 1 0909.301.01 Fall 2004 Shreekanth Mandayam ECE Department Rowan University http://engineering.rowan.edu/~shreek/fall04/eemag1/ Lecture 6a October 12, 2004

2. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University EEMAG-1: Topics Today

3. S. Mandayam/ EEMAG-1/ECE Dept./Rowan UniversityPlan Electrostatics Capacitance Parallel plate capacitor: A closer look Fringing fields in a “real” capacitor RF Electronics - Microstrip Lines Coaxial cable Lorentz Force Law Motion of a charge in an electrostatic field Applications

4. S. Mandayam/ EEMAG-1/ECE Dept./Rowan UniversityCapacitance Capacitance Good! Capacitance Bad!

5. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University Parallel-Plate Capacitor d VsVs z x + + + + + + + + - - - - - - - - - - - - - - - - - - - - -

6. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University A “Real” Capacitor

7. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University RF Electronics 10 GHz Satellite Receiver Downconverter

8. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University Microstrip Lines rr w d conductor Ground plane (conductor) insulator “Cross-talk”

9. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University Microstrip & Strip Line Configurations rr  r1  r2 rr rr microstrip buried microstrip striplines

10. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University Coaxial Cable z x y a  b VsVs

11. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University Lorentz Force Law Force [N] Charge [C] Electric Field [V m -1 ] Velocity [m s -1 ] Magnetic Flux Density [T]

12. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University Motion of a Charge in a Uniform Electrostatic Field x z At time zero At time t At time zero At time t Let DEMO: motionestat

13. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University Cathode Ray Oscilloscope y z x VxVx VyVy VAVA cathode anode deflection plates screen

14. S. Mandayam/ EEMAG-1/ECE Dept./Rowan University Ion Thruster http://nmp.jpl.nasa.gov/ds1/ Xe e-e- Xe + Xenon propellant electrons 65,000 mph + ions Text: pp. 350-352

15. S. Mandayam/ EEMAG-1/ECE Dept./Rowan UniversitySummary