What is side lobe in DSP?
In a directional antenna in which the objective is to emit the radio waves in one direction, the lobe in that direction is designed to have a larger field strength than the others; this is the “main lobe”. The other lobes are called “side lobes”, and usually represent unwanted radiation in undesired directions.
Why do Sidelobes occur?
Sidelobes are an unfortunate reality of all directional antennas. They are a consequence of nature and are directly related to diffraction effects in light – and there are similar effects in sound and water waves. Diffraction occurs whenever there is a sharp discontinuity in a radiating or reflecting surface.
What is lobe in radar?
Solution. Side lobes are naturally occurring areas of transmitted energy that are part of virtually any transmitter used in marine electronics. Radar, echo sounders (fishfinders) and sonars all generate a “main beam”, which is also known as the “main lobe”.
What is lobe width?
A practical engineering definition of main-lobe width is the minimum distance about the center such that the window-transform magnitude does not exceed the specified side-lobe level anywhere outside this interval. Such a definition always gives a smaller main-lobe width than does a definition based on zero crossings.
What is rectangular window in DSP?
As the sampling rate approaches infinity, the rectangular window transform ( ) converges exactly to the sinc function. Therefore, the departure of the roll-off from that of the sinc function can be ascribed to aliasing in the frequency domain, due to sampling in the time domain (hence the name “ ”).
What is Kaiser window in DSP?
It is a one-parameter family of window functions used in finite impulse response filter design and spectral analysis. The Kaiser window approximates the DPSS window which maximizes the energy concentration in the main lobe but which is difficult to compute.
What is Isantenna?
An antenna is a metallic structure that captures and/or transmits radio electromagnetic waves. Antennas come in all shapes and sizes from little ones that can be found on your roof to watch TV to really big ones that capture signals from satellites millions of miles away.
What is Sidelobe ratio?
1. The ratio, usually expressed in decibels (dB), of the amplitude at the peak of the main lobe to the amplitude at the peak of a side lobe.
What does lobe mean?
: a curved or rounded projection or division specifically : a usually somewhat rounded projection or division of a bodily organ or part.
What is main lobe in telecom?
Of an antenna radiation pattern, the lobe containing the maximum power (exhibiting the greatest field strength). (188) Note: The horizontal radiation pattern, i.e. , that which is plotted as a function of azimuth about the antenna, is usually specified.
What does the word love mean in the Bible?
As with things, loving persons may mean simply enjoying them and taking pleasure in their personalities, looks, achievements, etc. But there is another aspect of interpersonal love that is very important in the Bible. There is the aspect of love for persons who are not attractive or virtuous or productive.
What does it mean to be in love with someone?
“Love is a trust I place in someone. Love is a space for refuge, for pain, and for growth. Love is walking through a world of cold, dead pain and knowing there are human hearts beating somewhere and that one of them beats for me, and then my heart flutters like a dream come true.” — Hellion, 27, She/Her, Queer, In Love
How are sidelobes related to diffraction of light?
Andy Norris, in Radar and ARPA Manual (Third Edition), 2014 Sidelobes are an unfortunate reality of all directional antennas. They are a consequence of nature and are directly related to diffraction effects in light – and there are similar effects in sound and water waves.
Why are there more sidelobes in the visible space?
Hence, larger antennas have more sidelobes in the visible space (as the antenna size is increased, sidelobes move from the evanescent space to the visible space ). For a rectangular aperture antenna having a uniform amplitude distribution (or uniform weighting), the first sidelobe is −13.26 dB relative to the peak of the main beam.