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Analysis of infinite arrays of endfire slot antennas

Michael Edward Cooley, University of Massachusetts Amherst


Tapered slot antenna arrays have been increasingly studied and utilized in recent years. These arrays are well suited for many aerospace applications due to their potentially ultra-wide (3:1 or more) bandwidths (1). These arrays are also candidates for focal plane imaging systems (2), (3), (4), (5) and spatial power combining (6), (7). In recent years, numerous phased arrays and imaging arrays of tapered slot antennas have been designed and developed (8), (9), (10), (11). These array designs were based primarily on empirical approaches including, in some cases, the use of infinite array waveguide simulators. Analytical approaches to the design of such arrays are now being pursued to provide more rigorous design tools for future tapered slot array designs. This dissertation focuses on the analysis of infinite arrays of endfire slot antennas, with emphasis on tapered slot antenna arrays. Two full-wave moment methods of analysis have been developed and each has been validated by comparison with waveguide simulator measurements. Both methods are characterized by an initial application of the equivalence theorem at a plane in front of the array which offers computational advantages and modeling flexibilities. The first analysis, referred to as the air-dielectric analysis, has been used to perform parameter studies of tapered slot array radiation and scattering for some typical array geometries. Array input impedances versus frequency and scan angle were computed for five prototypical element geometries. For several of the arrays, the impedance varied rather moderately over the approximately 2:1 frequency band, but these impedances were also significantly inductive. This inductance could be due, at least in part, to the feed model which is used to drive the array elements. Principle plane active element patterns for these prototypical arrays were also computed.

Subject Area

Electrical engineering

Recommended Citation

Cooley, Michael Edward, "Analysis of infinite arrays of endfire slot antennas" (1992). Doctoral Dissertations Available from Proquest. AAI9219420.