Design of Bandpass Elliptic Filters Employing Inductive Windows and Dielectric Objects

Soler, Francisco Javier Pérez; Mendoza, Mónica Martínez; Pereira, Fernando Daniel Quesada; Rebenaque, David Cañete; Melcón, Alejandro Álvarez; Cameron, Richard J.

doi:10.1109/tmtt.2007.908673

Cited by 9 publications

(7 citation statements)

References 15 publications

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“…Coupling schemes for dual-mode filters have been analyzed according to the particular structures in many papers [7][8][9][10][11][12][13][14][15]. The filters under this study consist of the classical doublet topology as shown in Fig.…”

Section: Coupling Scheme Analysismentioning

confidence: 99%

“…2(a). This structure is known to have a response with one transmission zero if no source to load coupling is considered [13]. The coupling matrix for this doublet is shown in Fig.…”

Section: Coupling Scheme Analysismentioning

confidence: 99%

“…For those highorder modes, self-coupling M 11 and M 22 must be considered. It is important to bear in mind that one of the four mutual couplings must be opposite in sign with respect to the sign of the other three couplings which realize the negative coupling [13]. Since the proposed square cavities have a transversal symmetrical configuration in terms of the diagonal line, the values for the coupling from source and load to one particular resonator mode should be the same.…”

Section: Coupling Scheme Analysismentioning

confidence: 99%

“…Since the proposed square cavities have a transversal symmetrical configuration in terms of the diagonal line, the values for the coupling from source and load to one particular resonator mode should be the same. For these oversized Hplane cavities we need to look into the phase relation of the magnetic field at the input and output coupling apertures of the cavity to determine the sign of the coupling coefficient [13,14]. When the phase undergoes a 180 • phase shift between the input and output apertures, we consider that the coupling coefficient has changed the sign which implements the desired negative coupling.…”

Section: Coupling Scheme Analysismentioning

confidence: 99%

“…High-order mode cavities possess a higher unloaded Q value, especially for the circular and square cavities [7], thus smaller insertion loss can be envisioned. Dual-mode resonators are widely used in filter synthesis due to their ability to reduce the number of resonating elements and improve selectivity [7][8][9][10][11][12][13][14][15]. This paper investigates the characters of the square SIW cavities and presents an alternative scheme to design dual-mode filters with high-order modes.…”

Section: Introductionmentioning

confidence: 99%

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Realization of Millimeter-Wave Dual-Mode Filters Using Square High-Order Mode Cavities

Dong¹,

Wang²,

Tang³

2011

PIER Letters

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Some interesting results are presented in this paper by investigating the characteristics of square high-order mode cavities. Based on the standard printed circuit board (PCB) process and the substrate integrated waveguide (SIW) technology, two different square cavities which exhibit dual-mode filtering response are studied and implemented. Their bandwidths can be controlled by adjusting the eigen-frequencies of the resonating modes and the coupling apertures. The proposed configurations also allow implementing transmission zeros to improve the selectivity in an easy way. A Q-band quasi-elliptic filter using such two cavities in a folded configuration is designed, fabricated and measured. High selectivity and small insertion loss are achieved which are in good agreement with the simulated results.

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Section: Coupling Scheme Analysismentioning

confidence: 99%

“…2(a). This structure is known to have a response with one transmission zero if no source to load coupling is considered [13]. The coupling matrix for this doublet is shown in Fig.…”

Section: Coupling Scheme Analysismentioning

confidence: 99%

Section: Coupling Scheme Analysismentioning

confidence: 99%

Section: Coupling Scheme Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Realization of Millimeter-Wave Dual-Mode Filters Using Square High-Order Mode Cavities

Dong¹,

Wang²,

Tang³

2011

PIER Letters

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Planar realization of a Q‐band triple‐mode filter using high‐order resonances

Dong

Wang

Tang

et al. 2009

Micro & Optical Tech Letters

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A simple method for a Q‐band planar triple‐mode filter with quasi‐elliptic function response is proposed in this letter. This filter is implemented using a high‐order mode cavity with substrate‐integrated waveguide (SIW) technology and standard printed circuit board (PCB) process. By adopting an orthogonal input and output feed‐line and introducing some perturbation, transmission zeros are generated on both sides, which have significantly improved filter selectivity and out‐of‐band rejection. This triple‐mode resonator is then combined with a circular dual‐mode cavity to obtain a highly selective filter in Q‐band with better stopband rejection. Both of the two filters are fabricated and measured. Low insertion loss and sharp sideband characteristic are observed, which is in good agreement with simulation. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 600–603, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24114

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Integral equation analysis of multiport H‐plane microwave circuits by using 2D rectangular cavity Green's functions accelerated by the Ewald Method

Pereira

Cruz

Molina³

et al. 2022

IET Microwaves Antenna & Prop

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An integral equation technique for the analysis of multiport H‐plane microwave circuits composed of an unlimited number of arbitrarily shaped metallic and/or dielectric elements is proposed. The structure under study is divided into different regions after the application of the surface equivalence principle. Following this approach, the access waveguide ports are modelled by means of parallel plate Green's functions, whereas the central region is characterised by 2D rectangular cavity Green's functions. The use of this kind of Green's functions represents a novelty for solving H‐plane integral equation problems. For the first time, the Ewald method has been employed in order to accelerate the computation of the 2D rectangular cavity Green's functions and their derivatives, needed in the integral equation. In addition, convergence studies show the numerical convenience of using the Ewald method to achieve a fast and accurate evaluation of these Green's functions. Results show that the analysis can be very efficient if the structure is segmented in a proper way based on fitting the cavity resonator within the geometry of the structure under analysis. In fact, all the walls of the structure that are coincident with the auxiliary resonator need not to be discretised during the numerical solution. Finally, several simulation examples of practical inductive microwave circuits are presented and discussed, showing a good agreement and higher computational efficiency when compared to results provided by commercial full‐wave software tools and measurements.

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Design of Bandpass Elliptic Filters Employing Inductive Windows and Dielectric Objects

Cited by 9 publications

References 15 publications

Realization of Millimeter-Wave Dual-Mode Filters Using Square High-Order Mode Cavities

Realization of Millimeter-Wave Dual-Mode Filters Using Square High-Order Mode Cavities

Planar realization of a Q‐band triple‐mode filter using high‐order resonances

Integral equation analysis of multiport H‐plane microwave circuits by using 2D rectangular cavity Green's functions accelerated by the Ewald Method

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