Nonresonating Mode Waveguide Filters

Bastioli, Simone

doi:10.1109/mmm.2011.942009

Cited by 81 publications

(45 citation statements)

References 25 publications

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“…Filter topologies such as inductively coupled rectangular waveguide filters, E-plane metal insert filters, and evanescent mode waveguide filters have standard structures consisting of several cavities with overall longitudinal length equal or greater than a guided wavelength, which makes them infeasible to this application [26]. On the other side, multimode and dual-post resonator (DPR) filters provide compact structures [27][28][29]. Multimode filters enable multiple resonance frequencies.…”

Section: Horn Filtenna Design Andmentioning

confidence: 99%

“…Multimode filters enable multiple resonance frequencies. Its design modifies the waveguide cross-sectional dimensions in order to allow supporting the dominant mode in the vertical and horizontal polarizations for decreasing its longitudinal length [28]. A DPR filter does not change the waveguide main dimensions and is highly selective, easily tunable, and works as inductive obstacles, which are commonly used in conventional waveguide filters.…”

Section: Horn Filtenna Design Andmentioning

confidence: 99%

“…In addition, the different post lengths excite the filter resonant mode without extra coupling sections, reducing the filter overall dimension and complexity [29]. e nonresonant mode defines a resonant frequency away from the filter passband, which might be propagation or an evanescent mode that bypasses the resonant mode [28].…”

Section: Horn Filtenna Design Andmentioning

confidence: 99%

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Continuously Frequency-Tunable Horn Filtennas Based on Dual-Post Resonators

Alves

Silva

Boas

et al. 2019

International Journal of Antennas and Propagation

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This work reports the concept and development of two mechanically frequency-tunable horn filtennas for microwave and millimeter-waves. Our design approach relies on the integration of a horn antenna with a mechanically tunable filter based on dual-post resonators. The proposed filtennas have been manufactured and experimentally characterized, by means of reflection coefficient, radiation pattern, and gain. Measurements demonstrate that both filtennas have a tuning ratio of approximately 1.37 with continuous adjustment. The first prototype operates from 2.56 to 3.50 GHz, whereas in the second one the bandwidth is from 17.4 to 24.0 GHz. In addition, the higher-frequency filtenna has been implemented in a 5.0-meter-reach indoor environment, using a 16-QAM signal at 24 GHz. The best configuration in terms of performance resulted in a root mean square error vector magnitude (EVMRMS) and antenna radiation efficiency of 3.69% and 97.0%, respectively.

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Section: Horn Filtenna Design Andmentioning

confidence: 99%

Section: Horn Filtenna Design Andmentioning

confidence: 99%

See 1 more Smart Citation

Continuously Frequency-Tunable Horn Filtennas Based on Dual-Post Resonators

Alves

Silva

Boas

et al. 2019

International Journal of Antennas and Propagation

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“…Apart from classical destructive interference, bypass-couplings as proposed in e.g. [3,4] are used to increase the total number of TZs. Additionally, a frequencydependent coupling aperture [5][6][7][8] is able to introduce one additional TZ by replacing a classical (non-resonant) coupling aperture.…”

Section: Introductionmentioning

confidence: 99%

Techniques for the generation of multiple additional transmission zeros in H-plane waveguide filters

Miek

Boe

Kamrath

et al. 2020

Int. J. Microw. Wireless Technol.

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In this paper, different techniques for the generation of additional transmission zeros (TZs) in planar waveguide filters are investigated. In the classical theory, TZs are generated only by destructive interference of non-adjacent cavities, limiting the available number of TZs to the filter order itself. However, more approaches for the generation of TZs are known, including bypass-coupling in oversized cavities, frequency-dependent coupling apertures as well as dispersive/resonant TZs which can be realized by the direct source to load cross-coupling. The aim of this paper is to combine several of the strategies in one physical filter set-up to increase the maximal number of TZs beyond the filter order. Different Ku-band fourth-order filter set-ups are presented, showing in total between six and eight real as well as complex TZs. Three filters are manufactured as a proof of concept and compared with the simulation, showing very good agreement.

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“…More recently, the nonresonating node (NRN) concept has been introduced to generate compact BPFs [7], [8]. Beside compactness, NRNs create direct paths that are bypassing the resonators, thus enabling us to produce TZs with resonant elements in an in-line configuration, i.e., without the need for source-load coupling.…”

Section: Introductionmentioning

confidence: 99%

Substrate Integrated Waveguide Triple-Passband Dual-Stopband Filter Using Six Cascaded Singlets

Esmaeili

Børnemann

2014

IEEE Microw. Wireless Compon. Lett.

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A triple-passband, dual-stopband filter consisting of six cascaded singlets is introduced in substrate integrated waveguide (SIW) technology. Each singlet produces one independent transmission zero (TZ). Four of six TZs are placed within the filter passband, producing three passbands separated by two stopbands. The corresponding coupling matrix is synthesized based on a combination of well-known analytic and optimization methods. The SIW filter is designed for stopbands centered at 10.25 and 11.23 GHz, and passbands at 9.72, 10.76, and 11.76 GHz. The prototype is fabricated and measured. Good agreement between simulated and measured results is achieved. Index Terms-Bandpass filter (BPF), coupling matrix, dual-bandstop filter, nonresonating node (NRN), substrate integrated waveguide (SIW).

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Nonresonating Mode Waveguide Filters

Cited by 81 publications

References 25 publications

Continuously Frequency-Tunable Horn Filtennas Based on Dual-Post Resonators

Continuously Frequency-Tunable Horn Filtennas Based on Dual-Post Resonators

Techniques for the generation of multiple additional transmission zeros in H-plane waveguide filters

Substrate Integrated Waveguide Triple-Passband Dual-Stopband Filter Using Six Cascaded Singlets

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