How is information sent and received without wires A Wireless Communication System Antenna The Transmitter Let’s start from voice. How can we send one’s voice thousands of miles away? We first need a transmitter. Voice (the “goods”) is transformed into an electrical signal (the “package”).
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Let’s start from voice. How can we send one’s voice thousands of miles away? We first need a transmitter.
Carrier Freq Generator
η: Antenna efficiency, 45%-75% for parabolic
λ: wave length
Assume η=50%, D=0.6m, frequency=12GHz.
The modulator “loads” the voice signal onto the high frequency current.
There are several ways to load the voice signal: