RF Electronics Chapter 2: Computer Simulation Page 26
2022, C. J. Kikkert, James Cook University, ISBN 978-0-6486803-9-0.
the length of the stub is one quarter wavelength. An open circuit effect of the line is
included by using an MLEF line element. The T junction can be included to ensure that
the actual layout, including the required junctions, performs exactly as required. Using
the width as determined in figures 2.27 or 2.28, the length is now tuned or optimised to
produce a notch at the required frequency, as shown in figure 2.30. The quarter wave-
length line length at 1 GHz is optimised as 45.851736743757 mm, which is close to the
result from the Transmission Line Calculator.
Figure 2.29. Circuit for determining the length of one-quarter wavelength.
Figure 2.30. Frequency response of the circuit in figure 2.29.
For many circuits, simple test circuits like those of figures 2.27 and 2.29 can be used to
determine the basic parameters of Stripline or Microstrip lines that can then be used as
part of a more complex circuit. This is used in several places throughout this book.
RF Electronics: Design and Simulation
26 www.cadence.com/go/awr
