RF and Microwave Engineering: Fundamentals of Wireless Communications

Further Reading

Detlefsen J, Siart U (2009) Grundlagen der Hochfrequenztechnik. Oldenbourg.

Hagen, JB (2009) Radio-Frequency Electronics: Circuits and Applications. Cambridge University Press.

Meinke H, Gundlach FW (1992) Taschenbuch der Hochfrequenztechnik. Springer.

¹ We will limit our discussion to real-valued port reference impedances since complex-valued port reference impedances are of minor practical importance. Practical low-loss transmission lines have characteristic impedances that are—with good approximation—real.

² Most likely the vector network analyser in your laboratory has 50 Ω-ports.

³ Indeed we have already seen this when we discussed the Smith chart diagram in Section 3.1.11. If we mirror a point in the Smith chart at the real (horizontal) axis we get complex conjugate reflection coefficient and complex conjugate impedance.

⁴ Directional couplers are four-port networks that split off small amounts of waves travelling in different directions on a line to separated output ports. An important parameter of a direction coupler is the coupling coefficient k. We will discuss directional couplers in more detail in Section 6.10.

⁵ Instead of ‘dB’ the term could be ‘RI’ (for s-parameters given by real and imaginary parts) or ‘MA’ (for s-parameters in linear scale with phase in degree).