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Roberto Gomezgarcia - One of the best experts on this subject based on the ideXlab platform.
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spurious free Signal Interference dual band bandpass filters
2021 IEEE MTT-S International Wireless Symposium (IWS), 2021Co-Authors: Roberto Gomezgarcia, Li YangAbstract:The development of transversal Signal-Interference planar dual-band bandpass filters (BPFs) with extended upper stopband is addressed in this study. They are based on the exploitation of stepped-impedance-line transmission-line paths in their constituent dual-passband transversal filtering sections (TFSs) to “break” the spectral periodicity inherent to this type of filters in their traditional structures. A theoretical example of two-stage dual-band BPF derived through an optimization-based design procedure is provided to validate the approach, showing an up-per-stopband bandwidth 18.1 times larger than in its classic counterpart. Moreover, a proof-of-concept prototype of this dual-band BPF design example is manufactured in microstrip technology and measured for experimental-demonstration purposes.
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miniaturized Signal Interference bandpass filters using resonant rf Signal paths
European Microwave Conference, 2021Co-Authors: Dimitra Psychogiou, Roberto GomezgarciaAbstract:This paper presents a new class of miniaturized Signal-Interference bandpass filters (BPFs) using resonant Signal-Interference (RSI) stages. Miniaturization is achieved through: i) an RSI BPF stage in which series- and parallel-type resonators are incorporated in its two RF Signal paths and ii) the realization of high-order filtering transfer functions by directly cascading in series multiple RSI stages—i.e., without the need for inter-stage impedance inverters. The operating principles of the proposed RSI-based BPF concept are demonstrated through various theoretical examples using linear-circuit analysis. Furthermore, for proof-of-concept demonstration purposes, a microstrip prototype was designed, built, and measured at S-band with the following RF performance characteristics: center frequency of 2.6 GHz, 3-dB absolute bandwidth equal to 633 MHz, minimum in-band insertion loss of 0.8 dB, and in-band group-delay variation between 1.2-3.2 ns.
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low reflection Signal Interference single and multipassband filters with shunted lossy stubs
IEEE Microwave and Wireless Components Letters, 2020Co-Authors: Roberto Gomezgarcia, Li Yang, Josemaria MunozferrerasAbstract:Signal-Interference single- and multiband bandpass-type transversal filtering sections (TFSs) with input- and two-port low-reflection (LR) behavior are reported. These LR TFSs consist of the following three parts: 1) a reflective-type TFS shaped by two in-parallel unequal length transmission line segments; 2) a lossy open-ended stub shunted at the input or both at the input and output nodes of the building reflective-type TFS for the input- and two-port-LR TFS cases, respectively; and 3) input/output power-matching transmission line sections. In this manner, the stopband RF-Signal energy that is not transmitted by the reflective-type TFS is dissipated by the resistor(s) of the lossy open-ended stub(s) instead of being reflected back to the source. This allows LR capabilities to be obtained in the overall modified TFSs. The operational principles of the proposed input- and two-port-LR TFSs, along with theoretical design examples and their comparison, are presented. Moreover, multi-TFS-stage LR bandpass filters (BPFs) are shown. They are based on the in-series cascade of several LR TFSs to enlarge the bandwidth and power rejection levels of the stopbands while keeping their LR nature. For experimental validation purposes, microstrip prototypes of a three-TFS-stage BPF with broadened input-LR stopbands and a quintuple-band input-LR TFS are developed and characterized.
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wide band Signal Interference duplexer with contiguous single dual band channels and its application to quasi absorptive bandpass filters
Electronics Letters, 2018Co-Authors: Roberto Gomezgarcia, Josemaria Munozferreras, Wenjie Feng, Dimitra PsychogiouAbstract:A type of wide-band Signal-Interference planar duplexer with single- and dual-band channels is presented. It exploits transversal-Signal-Interference-section-based channels with contiguous single- and dual-passband filtering transfer functions. Furthermore, by ending the dual-band channel in a reference-impedance resistor, a wide-band bandpass filter (BPF) with quasi-absorptive stopbands is realised. As experimental validation, microstrip prototypes of a duplexer and a two-stage quasi-absorptive BPF that operate in the 1.6–4.4 GHz range are built and tested.
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silicon integrated Signal Interference dual band bandpass filter for gnss application
International Microwave Symposium, 2017Co-Authors: Mohammed Adnan Addou, Roberto Gomezgarcia, Julien Lintignat, Bruno Barelaud, Francois Torres, Stephane Bila, B JarryAbstract:An original silicon-integrated dual-band bandpass filter for Global-Navigation-Satellite-System (GNSS) bands is presented. The engineered filtering architecture consists of a two-path Signal-Interference transversal filtering section (TFS) made up of a quadrature power coupler that is arranged in reflection mode. It allows a sharp-rejection dual-passband filtering response with out-of-band transmission zeros (TZs) to be obtained through constructive and destructive feedforward Signal-combination effects that take place between the two electrical paths of the TFS. Furthermore, to counteract the losses inherent to the integrated lumped-element realization, compensated active inductors are used in the TFS stubs. For experimental validation, a low-noise-amplifier-(LNA)+filter module based on the conceived approach is designed with QUBIC4XI 0.25μm BiCMOS process from NXP technology, fabricated, and tested. This circuit, which operates on the two spectral bands utilized by the GNSS system (1215–1300 MHz and 1559–1610 MHz), features measured in-band power gain and noise figure respectively equal to 14 dB and 2 dB with a power consumption of 18 mW. To the best of authors' knowledge, it is believed to represent the first practical realization of a pure Signal-Interference dual-passband filter in integrated technology.
Dimitrios Peroulis - One of the best experts on this subject based on the ideXlab platform.
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a substrate integrated waveguide dual band bandpass filter based on Signal Interference principles
Radio and Wireless Symposium, 2017Co-Authors: Josemaria Munozferreras, Dimitra Psychogiou, Roberto Gomezgarcia, Dimitrios PeroulisAbstract:Contrary to conventional RF filtering devices that are based on electromagnetically-coupled resonators, Signal-Interference microwave filters exploit constructive and destructive interactions of Signals that propagate along different electrical paths of the filter volume. To date, most of Signal-Interference filters have been implemented in planar technologies. However, their operational principles are general and can hence be extrapolated to non transverse-electromagnetic-mode (TEM)/quasi-TEM technologies — either mixed or separate ones —. This paper reports on the design and manufacturing of a C-band Signal-Interference dual-band bandpass filter based on a half-mode substrate-integrated-waveguide (HMSIW) directional coupler. The obtained experimental results are in close agreement both with the theory and the simulations, which reveals that Signal-Interference filters can be extended to nonplanar technologies. Their potential for multi-stage higherorder filter realizations is also demonstrated.
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substrate integrated waveguide Signal Interference bandpass filters
European Microwave Conference, 2016Co-Authors: Dimitra Psychogiou, Josemaria Munozferreras, Roberto Gomezgarcia, Dimitrios PeroulisAbstract:This paper demonstrates the first experimental development of transversal Signal-Interference bandpass filters (BPFs) in substrate-integrated-waveguide (SIW) technology. They consist of bi-path transversal filtering sections (TFSs) that are based on 3-dB hybrid rings that are loaded with short-ended stubs in two of their ports. To attain circuit-size reduction in the overall TFS, a T-septum-ridge SIW is utilized as a transmission-line medium for its constituent modules. Furthermore, in order to allow excitation through conventional RF connectors, a broadband microstrip-to-T-septum-ridge-SIW transition is developed. For practical validation, a 6-GHz SIW TFS prototype featuring 3-dB bandwidth (BW) of 1.1 GHz-i.e., 3-dB fractional bandwidth (FBW) ≈18% — and minimum in-band insertion loss (IL) of 1.28 dB is constructed and characterized. In addition, measured results of a manufactured 5.25-GHz higher-order BPF (two series-cascaded SIW TFSs) with 790-MHz 3-dB BW-i.e., 3-dB FBW ≈15% — and 1.26-dB minimum in-band IL, are also shown.
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a class of differential mode single dual band bandpass planar filters based on Signal Interference techniques
Wireless and Microwave Technology Conference, 2016Co-Authors: Raul Loechessanchez, Dimitra Psychogiou, Roberto Gomezgarcia, Dimitrios PeroulisAbstract:The design of RF/microwave planar differential-mode single/dual-band bandpass filters (BPFs) based on Signal-Interference principles is addressed in this work. To this aim, transversal filtering sections (TFSs) that consist of bi-path in-parallel-transmission-line-type cells are embedded into the two identical parts of a balanced circuit. The engineered filtering devices feature sharp-rejection capabilities in their differential-mode transfer function through multi-transmission-zero (TZ) generation along with higher in-band power attenuation levels in their common mode of operation when compared to most of the related prior-art architectures. Furthermore, the proposed concept of balanced BPF can be extrapolated to other classes of Signal-Interference TFSs as well as to configurations with more-than-two passbands. For experimental verification, a demonstrative two-stage single-band balanced BPF centered at 2 GHz is synthesized, manufactured in microstrip technology, and characterized.
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hybrid surface acoustic wave microstrip Signal Interference bandpass filters
Iet Microwaves Antennas & Propagation, 2016Co-Authors: Roberto Gomezgarcia, Dimitra Psychogiou, Raul Loechessanchez, Dimitrios PeroulisAbstract:Radio-frequency (RF) design techniques for the development of Signal-Interference microwave bandpass filters (BPFs) with hybridised microstrip and surface-acoustic-wave (SAW) elements are reported. They make use of two original types of transversal filtering sections (TFSs) with embedded one-port SAW resonators. The SAW resonators operate either as non-resonating nodes or as an in-band SAW BPF in their bi-path circuit topologies. These new TFS approaches extend the suitability of Signal-Interference BPFs to small-fractional-bandwidth (FBW) applications, while offering significant advantages in terms of filtering selectivity and occupied circuit size when compared to traditional solutions for narrow-to-moderate/wide-band specifications. Broader FBWs than those attainable through most of the available all-acoustic-wave BPF configurations are also feasible with them. Moreover, a single type of SAW device is employed in the entire BPF structure, which results in a practical benefit regarding robustness to deviations in the prototype fabrication and assembly processes. The proposed filter design concepts are experimentally verified through the fabrication in microstrip technology and characterisation of two multi-TFS-series-cascade-based high-order BPF prototypes with very-narrow and moderate FBWs.
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Multi-band Signal-Interference planar bandpass filters based on stub-loaded transversal filtering sections
2016 IEEE MTT-S International Wireless Symposium (IWS), 2016Co-Authors: Roberto Gómez-garcía, Dimitra Psychogiou, José-maría Muñoz-ferreras, Dimitrios PeroulisAbstract:This paper addresses the application of bi-path stub-loaded in-parallel-transmission-line-type transversal filtering sections (TFSs) to the design of Signal-Interference microwave planar multi-band bandpass filters (BPFs). It is demonstrated that by inserting a ground-ended loading stub in one of the Signal-propagation paths of their building TFSs, several performance benefits in multi-band planar BPFs can be gained. Among them, it is particularly noticed i) the creation of a higher number of passbands for a particular size of the TFS two-path loop, ii) DC-transmission supression, and iii) synthesis of wide-band dual-band bandpass filtering responses with broadly-separated passbands. A comparison of the stub-loaded TFS with its classic counterpart is provided. Two design examples consisting of three-stage quad-band and broad-band dual-band BPFs with widely-spaced passbands, along with measurements for the former one, are also presented.
Dimitra Psychogiou - One of the best experts on this subject based on the ideXlab platform.
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miniaturized Signal Interference bandpass filters using resonant rf Signal paths
European Microwave Conference, 2021Co-Authors: Dimitra Psychogiou, Roberto GomezgarciaAbstract:This paper presents a new class of miniaturized Signal-Interference bandpass filters (BPFs) using resonant Signal-Interference (RSI) stages. Miniaturization is achieved through: i) an RSI BPF stage in which series- and parallel-type resonators are incorporated in its two RF Signal paths and ii) the realization of high-order filtering transfer functions by directly cascading in series multiple RSI stages—i.e., without the need for inter-stage impedance inverters. The operating principles of the proposed RSI-based BPF concept are demonstrated through various theoretical examples using linear-circuit analysis. Furthermore, for proof-of-concept demonstration purposes, a microstrip prototype was designed, built, and measured at S-band with the following RF performance characteristics: center frequency of 2.6 GHz, 3-dB absolute bandwidth equal to 633 MHz, minimum in-band insertion loss of 0.8 dB, and in-band group-delay variation between 1.2-3.2 ns.
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wide band Signal Interference duplexer with contiguous single dual band channels and its application to quasi absorptive bandpass filters
Electronics Letters, 2018Co-Authors: Roberto Gomezgarcia, Josemaria Munozferreras, Wenjie Feng, Dimitra PsychogiouAbstract:A type of wide-band Signal-Interference planar duplexer with single- and dual-band channels is presented. It exploits transversal-Signal-Interference-section-based channels with contiguous single- and dual-passband filtering transfer functions. Furthermore, by ending the dual-band channel in a reference-impedance resistor, a wide-band bandpass filter (BPF) with quasi-absorptive stopbands is realised. As experimental validation, microstrip prototypes of a duplexer and a two-stage quasi-absorptive BPF that operate in the 1.6–4.4 GHz range are built and tested.
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a substrate integrated waveguide dual band bandpass filter based on Signal Interference principles
Radio and Wireless Symposium, 2017Co-Authors: Josemaria Munozferreras, Dimitra Psychogiou, Roberto Gomezgarcia, Dimitrios PeroulisAbstract:Contrary to conventional RF filtering devices that are based on electromagnetically-coupled resonators, Signal-Interference microwave filters exploit constructive and destructive interactions of Signals that propagate along different electrical paths of the filter volume. To date, most of Signal-Interference filters have been implemented in planar technologies. However, their operational principles are general and can hence be extrapolated to non transverse-electromagnetic-mode (TEM)/quasi-TEM technologies — either mixed or separate ones —. This paper reports on the design and manufacturing of a C-band Signal-Interference dual-band bandpass filter based on a half-mode substrate-integrated-waveguide (HMSIW) directional coupler. The obtained experimental results are in close agreement both with the theory and the simulations, which reveals that Signal-Interference filters can be extended to nonplanar technologies. Their potential for multi-stage higherorder filter realizations is also demonstrated.
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substrate integrated waveguide Signal Interference bandpass filters
European Microwave Conference, 2016Co-Authors: Dimitra Psychogiou, Josemaria Munozferreras, Roberto Gomezgarcia, Dimitrios PeroulisAbstract:This paper demonstrates the first experimental development of transversal Signal-Interference bandpass filters (BPFs) in substrate-integrated-waveguide (SIW) technology. They consist of bi-path transversal filtering sections (TFSs) that are based on 3-dB hybrid rings that are loaded with short-ended stubs in two of their ports. To attain circuit-size reduction in the overall TFS, a T-septum-ridge SIW is utilized as a transmission-line medium for its constituent modules. Furthermore, in order to allow excitation through conventional RF connectors, a broadband microstrip-to-T-septum-ridge-SIW transition is developed. For practical validation, a 6-GHz SIW TFS prototype featuring 3-dB bandwidth (BW) of 1.1 GHz-i.e., 3-dB fractional bandwidth (FBW) ≈18% — and minimum in-band insertion loss (IL) of 1.28 dB is constructed and characterized. In addition, measured results of a manufactured 5.25-GHz higher-order BPF (two series-cascaded SIW TFSs) with 790-MHz 3-dB BW-i.e., 3-dB FBW ≈15% — and 1.26-dB minimum in-band IL, are also shown.
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a class of differential mode single dual band bandpass planar filters based on Signal Interference techniques
Wireless and Microwave Technology Conference, 2016Co-Authors: Raul Loechessanchez, Dimitra Psychogiou, Roberto Gomezgarcia, Dimitrios PeroulisAbstract:The design of RF/microwave planar differential-mode single/dual-band bandpass filters (BPFs) based on Signal-Interference principles is addressed in this work. To this aim, transversal filtering sections (TFSs) that consist of bi-path in-parallel-transmission-line-type cells are embedded into the two identical parts of a balanced circuit. The engineered filtering devices feature sharp-rejection capabilities in their differential-mode transfer function through multi-transmission-zero (TZ) generation along with higher in-band power attenuation levels in their common mode of operation when compared to most of the related prior-art architectures. Furthermore, the proposed concept of balanced BPF can be extrapolated to other classes of Signal-Interference TFSs as well as to configurations with more-than-two passbands. For experimental verification, a demonstrative two-stage single-band balanced BPF centered at 2 GHz is synthesized, manufactured in microstrip technology, and characterized.
Raul Loechessanchez - One of the best experts on this subject based on the ideXlab platform.
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a class of differential mode single dual band bandpass planar filters based on Signal Interference techniques
Wireless and Microwave Technology Conference, 2016Co-Authors: Raul Loechessanchez, Dimitra Psychogiou, Roberto Gomezgarcia, Dimitrios PeroulisAbstract:The design of RF/microwave planar differential-mode single/dual-band bandpass filters (BPFs) based on Signal-Interference principles is addressed in this work. To this aim, transversal filtering sections (TFSs) that consist of bi-path in-parallel-transmission-line-type cells are embedded into the two identical parts of a balanced circuit. The engineered filtering devices feature sharp-rejection capabilities in their differential-mode transfer function through multi-transmission-zero (TZ) generation along with higher in-band power attenuation levels in their common mode of operation when compared to most of the related prior-art architectures. Furthermore, the proposed concept of balanced BPF can be extrapolated to other classes of Signal-Interference TFSs as well as to configurations with more-than-two passbands. For experimental verification, a demonstrative two-stage single-band balanced BPF centered at 2 GHz is synthesized, manufactured in microstrip technology, and characterized.
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hybrid surface acoustic wave microstrip Signal Interference bandpass filters
Iet Microwaves Antennas & Propagation, 2016Co-Authors: Roberto Gomezgarcia, Dimitra Psychogiou, Raul Loechessanchez, Dimitrios PeroulisAbstract:Radio-frequency (RF) design techniques for the development of Signal-Interference microwave bandpass filters (BPFs) with hybridised microstrip and surface-acoustic-wave (SAW) elements are reported. They make use of two original types of transversal filtering sections (TFSs) with embedded one-port SAW resonators. The SAW resonators operate either as non-resonating nodes or as an in-band SAW BPF in their bi-path circuit topologies. These new TFS approaches extend the suitability of Signal-Interference BPFs to small-fractional-bandwidth (FBW) applications, while offering significant advantages in terms of filtering selectivity and occupied circuit size when compared to traditional solutions for narrow-to-moderate/wide-band specifications. Broader FBWs than those attainable through most of the available all-acoustic-wave BPF configurations are also feasible with them. Moreover, a single type of SAW device is employed in the entire BPF structure, which results in a practical benefit regarding robustness to deviations in the prototype fabrication and assembly processes. The proposed filter design concepts are experimentally verified through the fabrication in microstrip technology and characterisation of two multi-TFS-series-cascade-based high-order BPF prototypes with very-narrow and moderate FBWs.
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bandwidth enlargement in acoustic wave rf bandpass filters with planar transversal circuits
European Microwave Conference, 2015Co-Authors: Roberto Gomezgarcia, Dimitra Psychogiou, Raul Loechessanchez, Dimitrios PeroulisAbstract:A straightforward technique to increase the bandwidth of narrow-band frequency-selective circuits for its exploitation in surface-acoustic-wave (SAW) RF bandpass filters (BPFs) is presented. It is based on inserting the narrow-band circuit in a two-path transversal filtering section (TFS) so that its transmission band is enlarged by means of constructive Signal-energy interactions. Out-of-band transmission zeros (TZs) can also be produced through destructive Signal-Interference phenomena for high-selectivity BPF development with multi-TFS-cascaded design strategies. The proposed bandwidth-enlargement procedure can be either applied to complete BPFs or single resonators as it is theoretically proven through two ideally synthesized examples. Furthermore, its experimental usefulness is verified with the manufacturing and characterization of a two-stage mixed-technology SAW/microstrip BPF prototype at 890 MHz. This circuit shows a passband-width of ≈ 5× broader than that of its embedded on-chip SAW BPF (i.e., ≈ 3× wider than the kt2 of the constituent SAW resonator), while offering physical-size-reduction, passband-insertion-loss, and stopband-bandwidth advantages in relation to its conventional Signal-Interference planar filter counterpart.
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single multi band wilkinson type power dividers with embedded transversal filtering sections and application to channelized filters
IEEE Transactions on Circuits and Systems, 2015Co-Authors: Roberto Gomezgarcia, Dimitra Psychogiou, Raul Loechessanchez, Dimitrios PeroulisAbstract:This paper addresses the exploitation of Signal-Interference concepts for the realization of single/multi-frequency Wilkinson-type filtering power dividers in planar/lumped-element technologies. By embedding transversal Signal-Interference filtering sections into the arms of conventional Wilkinson-type power-divider topologies, RF/microwave power-distribution actions with intrinsic mono/multi-band bandpass filtering capabilities can be obtained. Analytical equations and rules for the theoretical synthesis of this dual-function device are derived. The generalization of the approach to multi-stage schemes for enhanced-performance designs or for the shaping of frequency-asymmetrical responses is also discussed. Furthermore, for practical demonstration, three prototypes are developed and characterized. They are a microstrip quad-band circuit for the 1–5 GHz range, a dual-band lumped-element device for the band of 0.2–0.6 GHz, and a new type of two-branch channelized active bandpass filter at 3 GHz that makes use of single-band versions of this dual-behavior component as Signal-division/combination blocks.
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analog Signal Interference narrow band bandpass filters with hybrid transmission line saw resonator transversal filtering sections
International Symposium on Circuits and Systems, 2015Co-Authors: Dimitra Psychogiou, Dimitrios Peroulis, Raul Loechessanchez, Roberto GomezgarciaAbstract:A technique to design analog Signal-Interference narrow-band bandpass filters by merging transmission lines and surface-acoustic-wave (SAW) resonators is reported in this work. By inserting one-/two-port SAW resonators into the transversal filtering sections (TFSs) of the Signal-Interference filter, narrowband filtering actions with remarkable electrical properties can be synthesized. The latter particularly refers to the untypically-high effective unloaded quality factor (Q u ) associated with the generated bandpass filtering response given its fully-planar realization. This leads to perceptible benefits in terms of in-band transmission loss and occupied physical area when compared to a classic pure Signal-Interference filter design. Moreover, for a given type of SAW resonator, adjustable bandwidth and transmission zeros (TZs) can be produced to attain a large variety of high-selectivity filtering functions. For practical validation, a three-stage microstrip narrow-band bandpass filter with measured S-parameters of a 433.9-MHz one-port SAW resonator is shown. The spurious-mode effect of the measured SAW resonator, as a limiting factor in the overall filter performance, is also discussed.
Josemaria Munozferreras - One of the best experts on this subject based on the ideXlab platform.
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low reflection Signal Interference single and multipassband filters with shunted lossy stubs
IEEE Microwave and Wireless Components Letters, 2020Co-Authors: Roberto Gomezgarcia, Li Yang, Josemaria MunozferrerasAbstract:Signal-Interference single- and multiband bandpass-type transversal filtering sections (TFSs) with input- and two-port low-reflection (LR) behavior are reported. These LR TFSs consist of the following three parts: 1) a reflective-type TFS shaped by two in-parallel unequal length transmission line segments; 2) a lossy open-ended stub shunted at the input or both at the input and output nodes of the building reflective-type TFS for the input- and two-port-LR TFS cases, respectively; and 3) input/output power-matching transmission line sections. In this manner, the stopband RF-Signal energy that is not transmitted by the reflective-type TFS is dissipated by the resistor(s) of the lossy open-ended stub(s) instead of being reflected back to the source. This allows LR capabilities to be obtained in the overall modified TFSs. The operational principles of the proposed input- and two-port-LR TFSs, along with theoretical design examples and their comparison, are presented. Moreover, multi-TFS-stage LR bandpass filters (BPFs) are shown. They are based on the in-series cascade of several LR TFSs to enlarge the bandwidth and power rejection levels of the stopbands while keeping their LR nature. For experimental validation purposes, microstrip prototypes of a three-TFS-stage BPF with broadened input-LR stopbands and a quintuple-band input-LR TFS are developed and characterized.
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wide band Signal Interference duplexer with contiguous single dual band channels and its application to quasi absorptive bandpass filters
Electronics Letters, 2018Co-Authors: Roberto Gomezgarcia, Josemaria Munozferreras, Wenjie Feng, Dimitra PsychogiouAbstract:A type of wide-band Signal-Interference planar duplexer with single- and dual-band channels is presented. It exploits transversal-Signal-Interference-section-based channels with contiguous single- and dual-passband filtering transfer functions. Furthermore, by ending the dual-band channel in a reference-impedance resistor, a wide-band bandpass filter (BPF) with quasi-absorptive stopbands is realised. As experimental validation, microstrip prototypes of a duplexer and a two-stage quasi-absorptive BPF that operate in the 1.6–4.4 GHz range are built and tested.
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a substrate integrated waveguide dual band bandpass filter based on Signal Interference principles
Radio and Wireless Symposium, 2017Co-Authors: Josemaria Munozferreras, Dimitra Psychogiou, Roberto Gomezgarcia, Dimitrios PeroulisAbstract:Contrary to conventional RF filtering devices that are based on electromagnetically-coupled resonators, Signal-Interference microwave filters exploit constructive and destructive interactions of Signals that propagate along different electrical paths of the filter volume. To date, most of Signal-Interference filters have been implemented in planar technologies. However, their operational principles are general and can hence be extrapolated to non transverse-electromagnetic-mode (TEM)/quasi-TEM technologies — either mixed or separate ones —. This paper reports on the design and manufacturing of a C-band Signal-Interference dual-band bandpass filter based on a half-mode substrate-integrated-waveguide (HMSIW) directional coupler. The obtained experimental results are in close agreement both with the theory and the simulations, which reveals that Signal-Interference filters can be extended to nonplanar technologies. Their potential for multi-stage higherorder filter realizations is also demonstrated.
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substrate integrated waveguide Signal Interference bandpass filters
European Microwave Conference, 2016Co-Authors: Dimitra Psychogiou, Josemaria Munozferreras, Roberto Gomezgarcia, Dimitrios PeroulisAbstract:This paper demonstrates the first experimental development of transversal Signal-Interference bandpass filters (BPFs) in substrate-integrated-waveguide (SIW) technology. They consist of bi-path transversal filtering sections (TFSs) that are based on 3-dB hybrid rings that are loaded with short-ended stubs in two of their ports. To attain circuit-size reduction in the overall TFS, a T-septum-ridge SIW is utilized as a transmission-line medium for its constituent modules. Furthermore, in order to allow excitation through conventional RF connectors, a broadband microstrip-to-T-septum-ridge-SIW transition is developed. For practical validation, a 6-GHz SIW TFS prototype featuring 3-dB bandwidth (BW) of 1.1 GHz-i.e., 3-dB fractional bandwidth (FBW) ≈18% — and minimum in-band insertion loss (IL) of 1.28 dB is constructed and characterized. In addition, measured results of a manufactured 5.25-GHz higher-order BPF (two series-cascaded SIW TFSs) with 790-MHz 3-dB BW-i.e., 3-dB FBW ≈15% — and 1.26-dB minimum in-band IL, are also shown.
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Signal Interference rf wide band bandpass filters using half mode substrate integrated waveguide hm siw directional couplers
International Symposium on Antennas and Propagation, 2015Co-Authors: Roberto Gomezgarcia, Dimitra Psychogiou, Josemaria Munozferreras, Dimitrios PeroulisAbstract:A new type of mixed-technology RF bandpass filter integrable with broad-band substrate-integrated-waveguide (SIW) antennas is presented. It makes use of a half-mode (HM) SIW 3-dB quadrature coupler in a transversal Signal-Interference scheme with microstrip loading stubs. This bandpass filter, being the first one of this class that utilizes SIW elements, enables to realize passband-widths limited in practice by the operative bandwidth of the HM SIW 3-dB coupler. Electromagnetic-simulation results of two layout-level-designed 14-GHz filters with fractional bandwidths (FBWs) of 25% and 50%, along with their ideal synthesized equivalent circuits, are shown for verification.
