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Re: Lambda by 2
hello safwat
Any sine wave with wavelength λ is periodically with a period = λ .. so how it is λguide/2 in T.L ???
As we know the components of the system are
source,
T.L,
load.
The src send a traveling (moving) sine wave with wavelength λ along the T.L until it reaches...
first, i agree with the one who say that at high frequency we can transmit the signal with small size antenna and also with narrow beamwidth so the gain will be high
second, as the frequency increase the attenuation due to the free space increase
but as we see the satellite communications used...
Re: Numerical Aperture.
hi
the numerical aperture indicates the ability of the fiber of the amount of power it can take from the src and sending to the rx by guided it only in the core.
as we know we have different types of fibers and every type has its properties
for example
step index fiber...
difference gain directivity
directivity
the ratio of the radiation intensity averaged over all directions. the av. radiation intensity is equal to the total power radiated by the antenna divided by 4pi
gain
the ratio of the intensity in a given directions. to the radiation intensity that...
hi
i agree with the previous replies that the antenna can be used as transmitter or reciever
and i would like to add that its recieving pattern is the same as the transmiting pattern.
mas
Re: Poynting Vector
hi jian i don't understand this sentence
and what are you meaning by inc and ref >> are they power or volt?
there is a little error in your equation
which is not the real power >> P = real{V-rms x conj(I-rms)}
i think that it is only writing error ... thx
Re: transport equation ?
it is an analytical solution of transport problem
it is called boltzman transport equation which is a statement that accounts for additions to and subtraction from the radiation in a given increment of space, energy and direction...
i don't think that you mean the name of correlation !!
if you want to design passive RC filter you only want to know
1- is the filter HPF (R-o/p) or LPF (C-o/p)?
2- the maximum magnitude of the transfere function |H(jw)|max.
3- the cut off value of the filter » 1/√2 × |H(jw)|max = 1/(RC)
then...
fourier series
f = a0 + ∑[an cos(n wo t) + bn sin(n wo t)]
a0 = average or dc value of the function
a1,b1 = coefficients of the fundamental harmonic (wo)
a2,b2 = coefficients of the second harmonic (2×wo)
.... etc
mas
Re: algebra problem
let f(a) = a^2 + a - 1 - a^3/2 and plot the function by matlab or any equation graph program.
read the points of intersection between f and a - axis » (f = 0) then it will give your answer .
if there is no inersection so there is no answer to this eguation...
Re: For satellite communication, the downlink frequency is l
as we know the radiated power from the antenna at a distance r is inversely proportional to f² (f=frequency) and this is in any medium.
so as f increases the attenuation of the power will increase. so we need to increase the power...
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