Analog Filters Using MATLAB by Lars Wanhammar

Author:Lars Wanhammar
Language: eng
Format: epub
Publisher: Springer US, Boston, MA

Unit elements can also be inserted from the source side, whereby a more symmetric filter is obtained. However, the inserted unit elements do not perform any frequency selective filtering if they are inserted by using the Kuroda-Levy identities.

4.8 Coupled Resonators Filters

A general approach to realize high-order filters is illustrated in Fig.4.26. Each resonator realizes a complex pole pair, and the coupling networks provide suitable coupling. The resonators may be purely of series or parallel type or a mixture of types, and there are many possible coupling networks that are used in practice [8, 76]. Examples of commonly used coupling networks are capacitors, inductors, transformers, and impedance inverters. However, the resonators and coupling networks should represent a lossless reactance network that is designed for maximal power transfer.

Fig. 4.26Generic coupled resonators filter

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