Design of Ka band highly selective wideband band-pass filters using directly coupled resonant irises

Barrio-Garrido, R.-M.; Llorente‐Romano, Sergio; Salazar‐Palma, Magdalena

doi:10.1109/aps.2003.1219441

Cited by 12 publications

(12 citation statements)

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“…However, responses of this type could have been easily obtained using centred resonant irises filters [2], [3]. One of the scopes of using non-centred irises is to obtain apertures of higher dimensions than those of the centred diaphragms.…”

Section: Design Example: Performance Of the Filtersmentioning

confidence: 99%

“…In the case of centred irises [2], [3], the initial response of the filter obtained from such circuital model is so close to the desired one that it is almost unnecessary a final phase of electromagnetic optimisation. Nevertheless, centred irises present an important drawback if the bandwidth is not too large or if the filter order is too high.…”

Section: Introductionmentioning

confidence: 99%

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Design of Broadband Directly Coupled Non-Centred Resonant Irises Filters

Barrio-Garrido

Llorente‐Romano

García-Lampérez

et al. 2003

33rd European Microwave Conference, 2003

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A novel type of broadband highly selective filters in waveguide technology is presented. It is based on directly coupled resonant irises filters. The position of the apertures is studied in order to obtain a filter structure easier to construct. The Mode Matching Method is used for the design and simulation of the structure. An efficient optimisation method is employed to overcome the design problems that presents the non-centred irises approach, namely, the higher order modes excited in these discontinuities that strongly modify the couplings between adjacent irises. This optimisation method is based on the estimation of these couplings, so it can be efficiently used to tune the dimensions of the initial design.

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Section: Design Example: Performance Of the Filtersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Broadband Directly Coupled Non-Centred Resonant Irises Filters

Barrio-Garrido

Llorente‐Romano

García-Lampérez

et al. 2003

33rd European Microwave Conference, 2003

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“…Single-aperture [16,17] or multi-aperture [18][19][20][21] irises have been extensively studied for the design of a variety of filter types since these structures have the ability to produce transmission and/or reflection zeros at controlled frequencies. Single irises in [16,17] exhibit a band-pass resonant characteristic without E-and H-plane symmetries at the same time, which may result in the appearance of high-order modes. Furthermore, the absence of notch elements in these designs entails the necessity of a very large number of sections to accomplish the required rejection values needed in the intended applications.…”

Section: Introductionmentioning

confidence: 99%

On the Use of a New Class of Simplified Multi-Window Iris Notch in the Design of Ultra-Compact High-Rejection Waveguide Filters for Satellite Links

2020

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This work introduces a simplified multi-aperture iris notch suitable for designing waveguide filters having an extremely improved compactness/rejection ratio, regarding available solutions, and adequate pass-band performances. The proposed iris architecture, analyzed for the first time, exhibits a unique transmission zero in the waveguide mono-mode bandwidth which can be easily located below or above the pass-band. The frequency of this transmission zero is evaluated in terms of the iris dimensions thus providing useful guidelines for designing filters with suitable responses. As a consequence of this simplified topology, any designed filter can be easily manufactured by cutting along its E-field symmetry plane. This strategy greatly improves the filter’s insertion loss regarding classical implementations based on more complicated arrangements with piled thin metallic sheets. Two exemplary filters have been designed and tested to be used in a high-performance X-band SATCOM terminal with an 80% size reduction with respect to the existing systems. Both filters covering the Rx (7.25–75 GHz) and Tx (7.9–8.4 GHz) sub-bands show a reflection of −25 dB with insertion losses below 1 dB in the pass-band, whereas they present a very sharp out-of-band rejection of at least 90 dB, that is, a 600 dB/GHz slope at X band.

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“…In the case of centred irises [2], [3], the initial response of the filter obtained from such circuital model is so close to the desired one that it is almost unnecessary a final phase of electromagnetic optimisation. Nevertheless, centred irises present an important drawback if the bandwidth is not b o large or if the filter order is too high.…”

Section: ~Ntroductionmentioning

confidence: 99%

“…The loaded quality factor and the resonant frequency of a resonator can be deduced from its scattering parameters through the relationships (3) and ( mped-element prototype.…”

Section: Non-centred Resonant Imses Filters Designmentioning

confidence: 99%

Design of broadband directly coupled non-centred resonant irises filters

Barrio-Garrido

Llorente‐Romano

García-Lampérez

et al.

33rd European Microwave Conference Proceedings (IEEE Cat. No.03EX723C)

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A novel type of broadband highly selective filters in waveguide technology is presented. It is based on directly coupled resonant irises fiters. The position of the apertures is studied in order to obtain a filter structure easier to construct. The Mode Matching Method is used for the design and simulation of the structure. An efficient optimisation method is employed to overcome the design problems that presents the non-centred irises approach, namely, the higher order modes excited in these discontinuities that strongly modify the couplings between adjacent irises. This optimisation method is based on the estimation of these couplings, so it can be efficiently used to tune the dimensions of the initial design.

show abstract

Design of Ka band highly selective wideband band-pass filters using directly coupled resonant irises

Cited by 12 publications

References 1 publication

Design of Broadband Directly Coupled Non-Centred Resonant Irises Filters

Design of Broadband Directly Coupled Non-Centred Resonant Irises Filters

On the Use of a New Class of Simplified Multi-Window Iris Notch in the Design of Ultra-Compact High-Rejection Waveguide Filters for Satellite Links

Design of broadband directly coupled non-centred resonant irises filters

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