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

By Vesna Crnojević-Bengin

The 1st of its variety, this paintings deals an in depth perception right into a diversity of layout strategies for dual-band and tri-band microstrip filters, from concept to sensible layout. Originating from the FP7 MultiWaveS undertaking, this entire source comprises the newest effects from numerous well-established learn teams, in addition to particular insurance of competing ways, starting from the normal method of complicated multilayer fabrication applied sciences, and the advance and alertness of a number of novel geometries and ideas. In-depth insurance of easy theoretical foundations, specific layout techniques and principles, and comparisons of measured and simulated effects aid you opt for the optimum process 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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The configuration proposed in [34] is a dual-mode dual-band ring resonator bandpass filter, which is implemented by a cascade of several microwave coupled transmission line sections that have non-linear phase shift properties in frequency, and are suitable for the development of dual-band devices. In that manner, the filter occupies less than 30% of the area of a traditional ring resonator filter. These structures are characterized by very good passband performance in terms of insertion loss and selectivity.

The first group comprises the filters in which the resonators of the same type but with different resonant frequencies are employed. The second group comprises filters that are realized with the resonators of different type. 37 (a) Configuration of the filter proposed in [98]. (b) Filter response. One of the simplest ways to realize a dual-band filter is to employ a pair of conventional λ/2 resonators as was done in [99] and [100]. The filter in [99] is comprised of two pairs of open-loop ring resonators, which are placed between two microstrip lines, whilst the filter in [100] has a different feeding scheme, one pair of resonators is inductively fed and the other is capacitively fed.

By combining two single-band filters. Application of different types of resonators as well as the fact that the two single-band filters are almost independent implies that this approach offers considerable design freedom. Against expectations, some of the most compact filters that exhibit excellent performance have been realized using this approach. As for tri-band filters realized using this method, they are based on combining dualband and single-band filters. Since there is a number of design methods for single-band and dual-band filters, this approach offers greater freedom in filter design.

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