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A compact diplexer fabricated on substrate-integrated waveguide (SIW) technology is presented. The diplexer is a sixth order coupled-resonator network with no additional elements such as power dividers, composed exclusively of three dual-mode square SIW cavities. The coupling between the two orthogonal resonant modes of each cavity is generated by means of additional vias perturbing the cavity symmetry,...
A microstrip sixth-order compact diplexer formed by split-ring resonators is presented. As a compact multiplexer, it consists entirely of a set of resonators coupled between them and with the ports, with no additional junction structure. The central element, shared by both channels and connected to the diplexer common port, is a conventional edge-coupled SRR (EC-SRR) that shows dual band behaviour...
This work extends an already known method for the design of multiband filters based on frequency transformations. A set of resonators is coupled to each resonator of a conventional single-band filter, constituting a block with as many resonators as pass bands. The star topology of the couplings makes this block impossible to implement except for the simplest cases. The solution consists of modifying...
A method for the design of bandpass filters with multiple pass bands is presented. The key point of this method is a frequency map between single-band resonators and multiple-band networks formed by those resonators with additional resonators coupled to them. The mapping problem is a non-linear one and the mathematical treatment, based on mapping the cut-off frequencies, is not simple. However, the...
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