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relation between gain and directivity
OK lets just discuss the similarities and the opposition. Since the book agrees with the text part, it has to be agreed in the equation derivations. Second thing, the book u mentioned is not specialized in antenna theory, u dont have to count on it. Do the...
difference between directivity and gain
Right. Regardless of the common definitions of both Gain and directivity that we all know, I will only add the followings.
Perspective of Efficiency:
First, any system's (antenna+feeder) efficiency is defined as the ratio between the input and the...
Re: Space-Time Coding
Here're matlab codes for the Alamouti scheme. Note that the Alamouti space-time code is applicable for only 2 TX antennas and ANY NUMBER OF RX ANTENNAS (not only 1).
Good luck.
Re: Repeater [hlp]
Hello elf61,
Remember that a repeater is just an amplifier that has the feature of reconstructing the original signal (transmitted) and retransmits it on different frequency for a certain range (distance). Another interesting note is that, if any frequency, say 30 MHz, is...
Re: Repeater [hlp]
You're right, there's a gain for the repeater (not 1 though). There's a principal difference between an amplifiers and repeater, which is that the repeater reconstructs the signal (and set it to the same old transmitted signal before any losses) and generates this new one.
Re: Repeater [hlp]
Look for any basic microwave engineering textbooks. The most widely known is that for Pozar available in this forum (do the search).
An RF repeater means that we have an RF amplifier with gain = 1. The theory, applications, block diagrams are those of RF amplifiers.
Good luck
Re: antenna array's..?
In conventional antenna arrays, there are three main kinds of arrays, end-fire, broadside, and phase-scanning based. It could be further classificed into: linear and non-linear, and uniform and non-uniform.
The main drawback of endfire arrays or broadside is that they're...
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