The theme of this thesis is the design and characterization of rf front-end broadband components implemented in a new technology. Every radar and wireless communication system contains components such as amplifiers, antennas, filters, and dividing/combining networks. Active components usually occupy a small percentage of the total footprint, while the rest is occupied by passive microstrip or co-planar-waveguide components. For multi-functional systems that operate over different frequency ranges it is desirable to have a single broadband PA that replaces individual amplifiers for each band. Thus it is beneficial in terms of real estate and simplicity to utilize passive components that are both compact and broadband.In this thesis, conventional dispersive transmission lines are replaced with PolyStrata micro-coaxial lines that exhibit loss around 0.1 dB/cm at 40 GHz and isolation of >60 dB for neighboring lines sharing a common wall. The characteristic impedance of the lines is constant over a broad range of frequencies, as the TEM mode is dominant up to around 450 GHz. The design, implementation, and characterization of micro-coaxial broadband (2--20 GHz) passive components such as matching networks (impedance transformers) and divider/combiner networks are presented. Although these components were designed around 2--20 GHz, with a re-design they can operate at much higher frequencies due to the micro-coaxial lines' capabilities.An example of a system operating at higher frequencies is NASA/JPL's Mars Science Laboratory (MSL) landing radar system, which will operate at either W-band or G-band. Size and weight constraints motivate the transition to these frequency bands. The nature of the PolyStrata fabrication process lends itself to the fabrication of rectangular waveguides above 90 GHz, making it an option for the frequency-scanned antenna array on the MSL. Results are presented in which both traveling-wave slotted-waveguide and slotted-coaxial antenna arrays at 100 GHz and 150 GHz were investigated for the MSL landing system.