A New Class of Pseudoelliptic Waveguide Filters Using Dual-Post Resonators

A new class of inline pseudoelliptic waveguide filters is presented in this paper. The proposed structure is based on a novel resonator, namely, the dual-post resonator, consisting of a pair of antipodal partial-height posts. The odd and even symmetry modes of the dual-post resonator are exploited a...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2013-06, Vol.61 (6), p.2332-2339
Main Authors: Tomassoni, C., Sorrentino, R.
Format: Article
Language:English
Subjects:
Applied sciences
Bandpass filters
Circuit properties
Couplings
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
elliptic filters
Exact sciences and technology
Filtering
Filtering theory
Frequency filters
Joining
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Oscillators, resonators, synthetizers
Periodic structures
Poles
Poles and zeros
Q factors
Resonant frequency
Resonator filters
Resonators
Topology
transmission zeros (TZs)
Waveguide discontinuity
Waveguide filters
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Summary:A new class of inline pseudoelliptic waveguide filters is presented in this paper. The proposed structure is based on a novel resonator, namely, the dual-post resonator, consisting of a pair of antipodal partial-height posts. The odd and even symmetry modes of the dual-post resonator are exploited as the resonant mode and nonresonating mode, respectively. The nonresonating mode generates a direct input-to-output coupling, thus providing a transmission zero that can be located either below or above the pole of the resonant mode. The coupling between the resonant mode and the source (or load), as well as the input-to-output coupling, can be controlled by properly selecting the height and position of each post of the dual-post resonator, no additional waveguide discontinuity being needed. N th-order filtering functions with a number of transmission zeros up to the number of poles can be realized by cascading N dual-post resonators. With respect to the conventional inline waveguide filter with inductive obstacles, the dual-post filter is easier to tune, shorter, and more selective, such advantages being paid by a somewhat lower Q factor. The design of fourth- and sixth-order dual-post filters is presented; the experimental results demonstrate the feasibility of the approach proposed.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2013.2258171