Low-Pass and Bandpass Filters With Ultra-Broad Stopband Bandwidth Based on Directional Couplers

Gómez‐García, Roberto; Sánchez-Soriano, Miguel Á.; Sánchez‐Renedo, Manuel; Torregrosa‐Penalva, Germán; Bronchalo, E.

doi:10.1109/tmtt.2013.2281965

Cited by 45 publications

(24 citation statements)

References 36 publications

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“…They correspond to previously published single-passband, six-band bandpass, and low-pass planar filters, as particular examples of digital-inspired RF filters [1], [7], [8]. The main results obtained for these filters are reported below.…”

Section: Analysis Examples: Signal-interference Microwave Passivsupporting

confidence: 84%

A Digital Interpretation of Frequency-Periodic Signal-Interference Microwave Passive Filters

Muñoz‐Ferreras

Gómez‐García

2014

IEEE Trans. Microwave Theory Techn.

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This paper addresses, for the first time, the digital representation of spectrally periodic signal-interference microwave passive filters. Starting from the theoretical rational transfer function of a synthesized transmission-line signal-interference analog filter, the real-valued coefficients of its digital-domain filter counterpart are derived. This discrete-time formulation for this type of microwave filters allows to clarify some confusing concepts into them, such as filter order. Moreover, some particular phenomena observed in associated experimental proof-of-concept planar prototypes, such as the appearance of out-of-band/spurious resonance peaks, are also explained by this study as zero-pole quasi-cancellations. In addition, it is demonstrated here that the use of the adjective "transversal" for this class of microwave passive filters could be no rigorous as it is understood in a digital sense since its discrete-time modeling commonly obeys an infinite-impulse-response structure. For validation, the expounded theoretical framework is applied to three examples of signal-interference passive filters exhibiting quasi-elliptic-type single-passband, six-passband, and low-pass responses.

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Section: Analysis Examples: Signal-interference Microwave Passivsupporting

confidence: 84%

A Digital Interpretation of Frequency-Periodic Signal-Interference Microwave Passive Filters

Muñoz‐Ferreras

Gómez‐García

2014

IEEE Trans. Microwave Theory Techn.

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“…Thus in general, sections of unit elements (UEs) are usually introduced as impedance (or admittance) invertors to transform the series stubs into shunt ones, leading to either redundant filters, which can be designed directly from the lowpass prototypes via Kuroda/Kuroda-Levy identities [2], or non-redundant filters, which require more complicated synthesis process [1], [3]. To further enhancing the selectivity and stopband rejection, the introduction of electric [4], [5] or magnetic [6]- [8] cross couplings and the utilization of multiple signal transmission paths [9]- [11] have been proven to be two rather efficient methods for introducing additional transmission zeros (TZs). However, these cross-coupled and transversal BSFs typically lack an exact design method.…”

Section: Introductionmentioning

confidence: 99%

A New Wideband Elliptic Bandstop Filter With Cross Coupling

Ren

Peng

et al. 2015

IEEE Microw. Wireless Compon. Lett.

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A novel fifth-order elliptic cross-coupled wideband bandstop filter (BSF) is proposed and designed in this letter. It is devised by introducing additional electric coupling into two nonadjacent quarter-wavelength shunt stubs of a conventional commensurate line BSF. The selectivity and stopband rejection can be effectively enhanced by two extra transmission zeros generated from the coupling. The proposed BSF is designed directly from the normalized lowpass prototype by using the design formulas, which are derived based on the rigorous correspondence between the BSF and its lumped prototype in the -plane. In order to demonstrate our design, a BSF example is developed, with a measured 27.2 dB stopband over a fractional bandwidth of 141.7%.

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“…Higher order magnetic-coupled BSFs are also available in [6], but no more TZs are generated. As an alternative approach, TZs can be achieved from signal interference between two main transmission paths [7], [8]. A 5th-order quasi-elliptic BSF is proposed in [9] based on a cross-coupled ring.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Elliptic Wideband Bandstop Filter Using Stepped-Impedance Coupled Line

Ren

Peng

et al. 2015

IEEE Microw. Wireless Compon. Lett.

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A cross-coupled wideband bandstop filter (BSF) with a 5th-order quasi-elliptic response is proposed and investigated in this letter. The BSF is composed of stepped-impedance coupled line connected by an open-circuited shunt stub. An enhanced selectivity and stopband rejection can be achieved as a result of two new transmission zeros, generated from the stepped-impedance coupled line. Based on the derived rigorous correspondence between the BSF and its lumped prototype, design of the proposed BSF can be handled as the same to the lumped network. A BSF example is given with measured stopband attenuation of 34.4 dB over a fractional bandwidth of 113.4%.

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Low-Pass and Bandpass Filters With Ultra-Broad Stopband Bandwidth Based on Directional Couplers

Cited by 45 publications

References 36 publications

A Digital Interpretation of Frequency-Periodic Signal-Interference Microwave Passive Filters

A Digital Interpretation of Frequency-Periodic Signal-Interference Microwave Passive Filters

A New Wideband Elliptic Bandstop Filter With Cross Coupling

Quasi-Elliptic Wideband Bandstop Filter Using Stepped-Impedance Coupled Line

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