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This paper presents an overview of recent research at the University of Colorado, Boulder, in the area of passive and active antenna arrays. Specifically, micro-coaxial array feed components, fabricated in the Nuvotronics PolyStrata™ process will be discussed as a means to miniaturized phased array. Performance of broadband Wilkinson dividers covering 2-22GHz (11:1 bandwidth) implemented in micro-coaxial lines for active transmit arrays is presented along with assembly methods for standard surface-mount resistors within the micro-coaxial environment. Integration of active devices with micro-coaxial components for 20W transmitters covering the 4-18GHz band is shown, and challenges associated with high power densities and interconnect parasitic are addressed. Ka-band (38 GHz) hybrids resulting in a 4×4 Buttler matrix with patch-like antennas integrated in PolyStrata™ are presented. The high-performance micro-coaxial environment is highlighted with its advantages and potential limitations. Frequency-scanned array designs for W and G-band operation are compared for PolyStrata™ micro-coaxial and waveguide-fed arrays. Finally, several other related approaches, including spatially-fed beam-forming arrays, are overviewed.