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Re: polarization
Co and Cross polarizations exist only in the case of linearly polarized antennas.
Power received by an antenna is proportional to Cos(θ), where θ is the angle between the E-vectors of the received wave and that would induce in the Rxr antenna (depends on its geometry and...
reciprocity theorem problems
In physical sense.....suppose A does Job1 and B does Job2 and jobs are done..
even if A and B are interchanged and jobs are done , we say that A and B obeys reciprocity........technically, if source and load in a network can be interchanged without change in the...
leakage current is like leakage of water through a small hole in the pipe which is a flow that is not needed. Amount of water leaked may be negligible compared to total useful flow.....Unless the leakage is prevented, it may damage the pipe in the future......
In transistor or a p-n junction...
waveguide..?
waveguide in the general sense means metallic pipes of proper dimension.For enabling them to be used for wave propagation, the design seems to be critical.
Usually a rectangular w.g has the dimensions (a,b a>b) of its cross section as design parameters. They can be designed using...
why antenna has gain
Directivity of an antenna is defined as the ratio of power radiated/received in a particular direction to that by an isotropic antenna if both are fed by the same input power.
Gain (dB)= 10 log (Directivity* efficiency)
efficency (<=1) is to be included when defining Gain...
Re: Antenna's work
Radiation mechanism of antenna.......
When electric current of high frequency is passed through a conductor, the electrons are forced to oscillate at the signal frequency (which is to be radiated !!).
1.
During the + ve half cycle of the signal, an electron is accelerated...
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