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Antenna Handbook - Fundamentals and Mathematical Techniques by Y.T. Lo, S. W. Lee

By Y.T. Lo, S. W. Lee

Quantity 1: Antenna basics and Mathematical ideas opens with a dialogue of the basics and mathematical innovations for any form of paintings with antennas, together with uncomplicated ideas, theorems, and formulation, and methods. DLC: Antennas (Electronics)

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14. It can be seen from this discussion that at 100 MHz, there is room for at least four (and many more) 100-kHz-wide baseband signals to be modulated on a carrier for a total of 400 kHz, which in turn can allow for the four computers in our example to communicate full duplex wirelessly over a simple local area network (LAN). 4%. 15 shows the hypothetical network implementation of such a system. Our case uses no guard bands to simplify the example. In a practical implementation, electrical filters would be used at the center RF frequencies to protect from adjacent channel crosstalk.

Rejecting image has to be resolved before the first mixer or in the first mixer circuitry. An RF receiver or transceiver system should be designed to reject image over its total RF input bandwidth. This is relatively simple in narrowband (NB) RF systems, but it can be very complex or sometimes impossible in wideband (WB) systems depending on the RF input bandwidth requirements and the IF choice. The wider the RF front end bandwidth is, the more complex the image rejection mechanism will become (as we will see later in Chapter 14).

The type of radios described earlier were quite sensitive, but had very poor selectivity. Many stations were received at the same time. It is interesting to look at some statements made during this time, statements that probably define the radio receiver as we know it today. “Imagination is better than knowledge,” said Albert Einstein, and scientists and engineers certainly had imagination during this time in history. William Crooks, an English physicist who missed the discovery of X-rays, envisioned the progress of radio receivers.

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