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Advances in Multi-Band Microstrip Filters by Vesna Crnojević-Bengin

By Vesna Crnojević-Bengin

The 1st of its sort, this paintings bargains an in depth perception right into a diversity of layout systems for dual-band and tri-band microstrip filters, from idea to functional layout. Originating from the FP7 MultiWaveS venture, this entire source comprises the newest effects from numerous well-established study teams, in addition to distinct insurance of competing ways, starting from the traditional method of complex multilayer fabrication applied sciences, and the improvement and alertness of a number of novel geometries and ideas. In-depth insurance of simple theoretical foundations, distinctive layout strategies and principles, and comparisons of measured and simulated effects help you decide on the optimum method to your reasons and designs, making this a useful source for either scholars and execs within the box of microwave engineering.

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29 (a) Configuration of the filter proposed in [60]. (b) Filter response. passbands cannot be independently controlled to the full extent, since the filter is based on SIRs. What is more, this configuration can be used only if two passbands are closely positioned. As for tri-band filters, they are based on tri-mode stepped-impedance resonators, which were shown to have great potential for application in multi-band filters. Since a tri-mode stepped-impedance resonator consists of three segments with different impedances, this resonator has more degrees of freedom for the control of its response in comparison to dual-mode stepped-impedance resonators.

37. Using λ/4 resonators which are more compact but also more demanding in terms of fabrication, dual-band filters with good performance and significantly reduced size were designed [102–107]. More demanding filters in terms of design are those that employ dual-mode resonators with different resonant frequencies. In the previous section, it was shown that dual-band filters can be realized using only one dual-mode resonator. Thus, we can pose the question, why we need two dual-mode resonators with different resonant frequencies to design a dual-band filter.

29 (a) Configuration of the filter proposed in [60]. (b) Filter response. passbands cannot be independently controlled to the full extent, since the filter is based on SIRs. What is more, this configuration can be used only if two passbands are closely positioned. As for tri-band filters, they are based on tri-mode stepped-impedance resonators, which were shown to have great potential for application in multi-band filters. Since a tri-mode stepped-impedance resonator consists of three segments with different impedances, this resonator has more degrees of freedom for the control of its response in comparison to dual-mode stepped-impedance resonators.

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