Advanced Antenna Techniques
Scientific rept. no. 1, 1 Dec 1962-30 Sep 1963
PHILCO CORP BLUE BELL PA
Pagination or Media Count:
A generalized theory of resolution for linear array antennas is presented. The theory indicates that angular resolution is determined by the width of the autocorrelation of the field pattern and not by the width of the pattern it self. Hence, a well-defined main beam is not a prerequisite for achieving angular resolution even noiselike beams can be characterized by an autocorrelation function of narrow width. It is shown that this basic principle leads to the concept of angular dispersion and compression, a phenomenon for angular beam patterns akin to dispersion and compression of radar pulses. A new procedure for synthesizing antennas for given resolution properties is also presented. The theory is applied to antennas with time-invariant and time- varying illumination functions, and is used to reexamine classical theories of superdirectivity. Antennas which intimately link resolution properties in range and angle are also analyzed arrays in which each radiator operates at a different frequency are shown to be an example of this class. In addition to an exposition of angular resolutions theory, preliminary concepts for achieving angular dispersion and compression, and superdirectivity are also presented.
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