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This paper demonstrates two broadband air-filled micro-coaxial 4:1 (2–24 GHz) and 2.25:1 (2–22 GHz) impedance transformers. The 4:1 transformer converts 50 to 12.5 \Omega and the 2.25:1 device transforms 50 to 22.22 \Omega. The circuits are fabricated on silicon with PolyStrata technology, and are implemented with \650\ \mu\ m\times \400\ \mu\ m air-filled micro-coaxial lines. Back-to-back circuits and single structures with geometrical tapers are designed for systematic characterization. Simulation and measurement results are in excellent agreement. The return loss for both transformers is better than 15 dB over the design bandwidth. [ABSTRACT FROM PUBLISHER]

This paper presents several micro-coaxial broadband 2: 1 Wilkinson power dividers operating from 2 to 22 GHz, a 11 : 1 bandwidth. Circuits are fabricated on silicon with PolyStrata technology, and are implemented with 650 μm × 400 ×m air-supported micro-coaxial lines. The measured isolation between the output ports is greater than 11 dB and the return loss at each port is more than 13 dB over the entire bandwidth. The footprints of these dividers can be miniaturized due to the high isolation between adjacent coaxial lines and their tight bend radius. For higher power handling, larger lines with a cross section of 1050 μm × 850 μm are also demonstrated. The effect of mismatch at the output ports is investigated in order to find the power loss in the resistors. [ABSTRACT FROM AUTHOR]