(2015), Enhanced topologies for the design of dual-mode filters using inductive waveguide structures, Radio Sci., 50, 66-77, doi:10.1002 Abstract This paper presents novel topologies for the design and realization of microwave filters combining dual-mode and single-mode cavities in all-inductive waveguide technology. Examples of orders 3-5 with one or two transmission zeros are synthesized and designed, in order to demonstrate the validity of the proposals. All the coupling schemes explored exhibit the zero-shifting property, so the transmission zeros can be easily placed above or below the passband. A four-pole dual-band-pass filter is also designed to show the flexibility offered by the novel structures. A prototype of this dual-band filter has been manufactured and tested in order to provide experimental validation for these new structures. Important aspects of synthesis techniques, required to obtain the associated coupling topologies and to perform the final physical design of the waveguide filters, are also addressed in this paper.

Abstract-In this paper, we propose an alternative configuration for the design of bandpass inductive filters using transversal topologies. The structure is based on the use of a dielectric post asymmetrically placed on a cavity resonator. The input and output windows will couple energy to the TE 102 -and TE 103 -mode resonators at the same time, therefore obtaining the transversal topology. The proposed configuration is very compact, and allows to implement transmission zeros for maximum selectivity in an easy way. Results are validated with Ansoft's finite-element High Frequency Structure Simulator tool, and with an integral-equation technique to demonstrate the validity of the proposed structure.

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