RF Electronics Chapter 7: RF Filters Page 237
2022, C. J. Kikkert, James Cook University, ISBN 978-0-6486803-9-0.
spacing between the stubs is then adjusted such that the return loss of the circuit is large
at the centre frequency of the filter, so that the harmonic stub circuit has the least effect
on the filter performance. The stubs are folded to minimise the space used by the whole
filter. Note this filter was designed and build before EM based X models were readily
available. At present one would use MTEEX, MCROSSX$ and MLEFX elements for
better accuracy.
Figure 7.47. Folded harmonic stubs.
Figure 7.48. Frequency response of harmonic stubs.
RF Electronics: Design and Simulation
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