Aims: This course introduces students to the engineering techniques and approaches required at radiofrequency (RF) and microwave frequencies. This includes circuit design concepts using matrix formulations and in particular the scattering matrix representation (S-parameters). The concept of matching is introduced to reduce reflections within high frequency circuits and design approaches using the Smith chart are described. Modern circuit realisation using stripline technologies are outlined. High frequency amplifer design and applications to digital radio are introduced.
After completion of the Unit the student should: be able to design simple microwave networks using matrix approaches; be able to use the Smith chart to design matching networks; have an appreciation of stripline realisation of high frequency circuits; be able to design amplifier circuits and compensate for such non-idealities as mismatching and distortion; have a knowledge of the architecture and components of digital radio systems.
Students will learn the techniques and design and analysis approaches suitable for high frequency devices and circuits. These skills will be demonstrated by the design and analysis of typical devices and circuits. Taught, facilitated and tested.
Matrix description of high-frequency circuits, ABCD and S-parameters, examples of circuits.
Smith chart formulation and use; lumped element, single stub and double-stub matching techniques.
Stripline technology; microstrip components, cross-talk (coupling) effects.
High frequency amplifier design; matching, stability and oscillation conditions, 3rd order intercept point, feedback and feedforward distortion control.
Digital radio techniques; receiver architecture, frequency synthesis, direct digital synthesis, software radio.