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 λ , is distance for one cycle • v p speed of the wave in the transmission line λ = f v p EE475 DR. Kirkman Lecture 3 USC 4 Common Transmission Lines Coax Cable Fields are inside the dielectric Teflon dielectric ε r=2.2 r p c v ε = = 2X10 10 cm/sec λ 500MHz =40.5cm Microstrip Line Fields are both inside and outside of the dielectric material. Use an effective dielectric constant. ε eff For 70ohm line on 0.1mm thick GaAs ε eff = 7.8 conductors Dielectric λ 500MHz =21.3cm λ 1.9GHz =10.5cm λ 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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