![]() ChemistryFactsheets may be copied free of charge by teaching staff or students. ![]() ![]() For each sensor array, two spatial filters were constructed with different pattern requirements to demonstrate the operation of the DBF.Ĭhem Factsheet Questions. Of a 4-element linear array, a 16-element linear array and a 16-element rectangular array. Hence, the terms that multiply t must equal, the terms that multiply t cubed must be equal, and the terms that multiply t to the 5th power must be equal. The array has an even number of elements, so we'll write the array factor as: Using the, the above equation can be rewritten as: We'll calculate our parameter ( ) as: Then we'll substitute for cos(u) into the last equation for the AF as described previously: We now have a polynomial of order N-1 = 5, so we'll use the Chebyshef polynomial T5(t), and equate that to our new array factor: The above equation is valid for all values of t. We'll assume the array has half-wavelength spacing, and recall that the Dolph-Chebyshev method requires uniform spacing and the array to be steered towards broadside (and yes, everyone spells Chebyshef in a different way, which is why I keep changing the spelling). Consider a N=6 element array, with a sidelobe level to be 30 dB down from the main beam ( S=31.6223). ![]() On this page, we'll run through an example. Dolph-Chebyshef Weighting Example for Antenna Arrays Dolph-Chebyshev Example Previous: (Home) Page In the previous page on, the Dolph-Tschebysheff method was introduced. ![]()
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