By Arun K. Bhattacharyya
A finished advisor to the most recent in phased array antenna research and design--the Floquet modal dependent approachThis finished publication bargains an intensive presentation of a brand new method for phased array antenna research according to Floquet modal enlargement. Engineers, researchers, and complicated graduate scholars fascinated about phased array antenna expertise will locate this systematic presentation a useful reference.Elaborating from primary ideas, the writer offers an in-depth remedy of the Floquet modal established technique. precise derivations of theorems and ideas are supplied, making Phased Array Antennas a self-contained paintings. each one bankruptcy is via a number of perform difficulties. furthermore, quite a few layout examples and guidance can be came upon hugely worthwhile via these engaged within the sensible software of this new method of phased array structures.Broadly prepared into 3 sections, Phased Array Antennas covers:* the improvement of the Floquet modal established method of the research of phased array antennas* program of the Floquet modal dependent method of vital phased array buildings* formed beam array synthesis, array beam forming networks, energetic phased array structures, and statistical research of phased arraysIncorporating the newest advancements in phased array expertise, Phased Array Antennas is a vital source for college students of phased array thought, in addition to learn execs and engineers engaged within the layout and development of phased array antennas.
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Additional resources for Phased Array Antennas : Floquet Analysis, Synthesis, BFNs and Active Array Systems
Sample text
Thus at the center frequency the peak of the array beam occurs at the desired scan angle, but it deviates from the desired scan angle at other frequencies of the band. 14. 58). Suppose is the scan angle corresponding to the frequency f , which is different from the center frequency f0 . 14 Beam deviation due to frequency shift. 61) implies that the beam deviation increases with frequency shift and with the scan angle as well. For a wide beam and a small scan angle this beam deviation may not pose much of a problem, but for a narrow beam and/or a wide scan angle, the gain reduces significantly with the frequency at the desired scan location.
27) we notice that An . 24). Now, is proportional to Gco n exp jk0 na sin cos can be considered as the complex copolar gain of Gco n ˜ co nth element, G n , which includes the additional phase for the path difference of the radiated field. 29) where C is a constant and the asterisk indicates the complex conjugate. This proves that the highest gain of an array can be accomplished if the element’s incident voltage (or current) is proportional to the complex conjugate of its active element gain. 29) implies that for identical radiation patterns of the elements, the amplitude distribution should be uniform in order to have maximum array gain.
This proves that the highest gain of an array can be accomplished if the element’s incident voltage (or current) is proportional to the complex conjugate of its active element gain. 29) implies that for identical radiation patterns of the elements, the amplitude distribution should be uniform in order to have maximum array gain. However, the amplitude distribution should not be uniform for dissimilar elements; thus the maximum-gain theorem has very important significance in designing a pencil beam array with dissimilar elements.