A gap-induced element resonance in single-polarized arrays of notch antennas

Arrays of notch antennas offer one of the best opportunities for realizing wide-bandwidth, wide-scanning phased arrays. There are a number of troublesome resonances that plague these arrays. These resonances disrupt the otherwise wide-bandwidth performance of the arrays. Using a simulation method developed by Schaubert (see Univ. of Massachusetts Antenna Lab. Report, 1992), the operation and troublesome behavior of notch antenna arrays are studied. This paper presents discoveries related to an element resonance that is induced by gaps in the metal that forms the array elements.<
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