Lecture3

Lecture3 - EE475 DR. Kirkman Lecture 3 USC 1 Wireless...

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Unformatted text preview: EE475 DR. Kirkman Lecture 3 USC 1 Wireless Communications Technology Transmission Lines Dr. George Kirkman EE475 Fall 2006 EE475 DR. Kirkman Lecture 3 USC 2 Electrical Size Matters In AC circuit analysis components and connecting wires are usually small compared to wavelength In RF circuit analysis components and connecting wires can be comparable or even large in size as compared to wavelength EE475 DR. Kirkman Lecture 3 USC 3 Wavelength Frequency f , number of cycles per second Wavelength , is distance for one cycle v p speed of the wave in the transmission line = f v p EE475 DR. Kirkman Lecture 3 USC 4 Common Transmission Lines Coax Cable Fields are inside the dielectric Teflon dielectric r=2.2 r p c v = = 2X10 10 cm/sec 500MHz =40.5cm Microstrip Line Fields are both inside and outside of the dielectric material. Use an effective dielectric constant. eff For 70ohm line on 0.1mm thick GaAs eff = 7.8 conductors Dielectric 500MHz =21.3cm 1.9GHz =10.5cm 1.9GHz =5.7cm EE475 DR. KirkmanEE475 DR....
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Lecture3 - EE475 DR. Kirkman Lecture 3 USC 1 Wireless...

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