Microwave

Dimensioning

Engineering

Aerospace engineering

Distributed element filter

Coupling (piping)

Telecommunications

Computer science

Prototype filter

Filter (signal processing)

Mechanical engineering

Physics

Waveguide filter

Electronic engineering

Resonator

Microwave engineering

Topology (electrical circuits)

Network synthesis filters

Filter design

Band-pass filter

Computer vision

Electrical engineering

IEEE Transactions on Microwave Theory and Techniques

Frequency-dependent coupling (FDC) emerges as a new method to introduce the finite-position transmission zeros (TZs) in the synthesis and design of filtering networks. In this paper, several fundamental building blocks with FDCs are introduced and studied. The higher order filters with many TZs can be constructed by cascading these fundamental building blocks. As compared with the conventional coupled-resonator filters with only constant couplings, the inclusion of FDCs can potentially create more TZs with the same coupling topology. It is also shown that to realize the same TZs, a filter can be realized in a simplified structure with less cross-couplings by using FDCs. In this paper, one complete filter design procedure is illustrated, including the steps of the circuit model synthesis by the method introduced in this paper, physical dimensioning of the filter by the electromagnetic simulation and measurement of the fabricated filter. The measurement results are in very good agreement with the theoretical predictions, which validates the modular design strategy for filters with FDCs.

Cascading Fundamental Building Blocks With Frequency-Dependent Couplings in Microwave Filters