A method of ‘mode shifting’ is presented for realisation of triple‐mode and dual‐mode filters, in which the resonant frequency of one mode is shifted near to the resonant frequency of another mode using a perturbation. To realise a triple‐mode filter, a single‐layer substrate‐integrated waveguide (SIW) square cavity is perturbed by introducing vias at the middle of the structure. This perturbation causes mode shifting of the dominant mode (TE101) near to the next modes (TE102 and TE201). Operation of this triple‐mode resonator is analysed and resonant frequencies of the perturbed cavity are obtained theoretically. A triple‐mode filter is realised using this resonator and the filter is modelled by a coupling matrix based on the global eigenmodes. Moreover, by using the mode shifting technique, a novel dual‐mode bandpass filter with half‐mode SIW (HMSIW) structure is presented. Both the triple‐mode SIW and dual‐mode HMSIW filters are fabricated on a single‐layer substrate using a printed circuit board process.

In this article, a novel dual mode dual band substrate integrated waveguide (SIW) filter is presented. Dual band operation of the filter is realized by providing two paths for the input signal to the output port. The signals of two paths have opposite sign and equal amplitude at a frequency between two bands and hence, a transmission zero is generated in this frequency. The dual mode resonator is a square SIW cavity perturbed by corner cut. A three-cavity dual mode dual band filter is designed using coupling matrix. Frequency response of the filter obtained from the coupling matrix is in good agreement with the full wave simulation result. Keywords-dual band filter; dual mode resonator; Substrate Integrated Waveguide (SIW);I.

This work presents a V-band iris filter, based on recently introduced groove gap waveguide technology. In this technology, it doesn't need to have electrical contact between two constituting metallic surfaces, as it is needed in conventional hollow waveguides. Therefore, it is cheaper to manufacture gap waveguide components, in particular in millimeter wave frequency range. In this work, square shape groove gap waveguide cavities are used as filter resonators. To realize the input/output coupling and also inter cavity coupling, two larger pins are used to act as an iris. A fifth order bandpass Chebyshev filter is designed with 1 GHz bandwidth at 59.5 GHz center frequency and a prototype is manufactured to validate the simulation results. Design process, simulated results, and measured results are presented here.

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