Coaxial cable connectors are a fundamental component for interfacing with RF devices up to hundreds of gigahertz. The frequency handling capability of coaxial connectors is based upon the dimensions of the inner and outer conductors, as well as the quality of precision in which the parts of the coaxial connector are constructed. Coaxial connectors are generally designed with either 50 or 75 ohms of impedance. The impedance of the coaxial connector is dictated by the dielectric material between the inner and outer conductors and their ratio.

This is a detailed article comparing phase noise measurement techniques and their advantages and disadvantages. You will need to be a member of the Microwave Theory and Techniques society of the IEEE to view the article for free. A purchase option may be available if you are not a member.

With the evolution of wireless systems and services, the on-air signals themselves are also undergoing very significant transformations. This paper by Besser Associates instructor Earl McCune provides a survey of the active and coming-soon signal types adopted for wireless systems around the world. Focus is on modulation schemes, along with various measures used to characterize the signals before and after power amplification.