Lecture8 - Wireless Communications Technology Systems...

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EE475 DR. Kirkman Lecture 7 USC 1 Wireless Communications Technology Systems Review Dr. George Kirkman EE475 Fall 2006
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EE475 DR. Kirkman Lecture 7 USC 2 Communications Link Carrier power Transmitter Path loss Receiver Noise Receiver G/T Combining uplink and downlink Information E b /N 0 and BER Channel capacity Multiple access
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EE475 DR. Kirkman Lecture 7 USC 3 Transmitter Transmitter power P t Mismatch losses 1-| Γ | 2 Matching Stub tuning , smith chart Antenna gain G= e 4 π A/ λ 2 • EIRP GP t
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EE475 DR. Kirkman Lecture 7 USC 4 Transmitter example 100W power source at 18GHz with Z 0 =50 Feed Loss 3.5dB Antenna 13m diameter Antenna measured gain = 65.2dBi Antenna Impedance 100 + j50 What is the reflection coefficient at antenna? Pt is power delivered to antenna calculate in dBW How can match be improved? If mismatch is eliminated what is Pt What is EIRP? What is the antenna efficiency in %?
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EE475 DR. Kirkman Lecture 7 USC 5 Reflection coefficient magnitude is 0.45 Reflection loss is 1-0.45
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