Design of Capacitively Loaded Coupled-Line Bandpass Filters With Compact Size and Spurious Suppression

Orellana, Marco; Selga, Jordi; Vélez, Paris; Sans, Marc; Rodríguez, Ana; Bonache, Jordi; Boria, Vicente E.; Martín, Ferran

doi:10.1109/tmtt.2016.2638843

Cited by 41 publications

(30 citation statements)

References 57 publications

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“…Narrow BPFs with sharp selectivity and high rejection are increasingly demanded in modern microwave systems. To miniaturize such filters, SRRs [11][12][13], CSRRs [10], composite right-/ left-handed coplanar waveguide (CRLH-CPW) resonators [14], multisection stepped-impedance (SI) resonators [15], electromagnetic bandgap (EBG) resonators [16], and capacitively loaded coupled lines [17] have been applied. In this work, a new narrow BPF is investigated both theoretically and experimentally with a simple design and a higher level of miniaturization using BC-SRs which are electrically coupled to the line.…”

Section: Introductionmentioning

confidence: 99%

A New Ultracompact Narrow Bandpass Microstrip Filter Using Double-Negative Quasiplanar Cells

Khawary

Nayyeri

Hashemi

et al. 2020

International Journal of Antennas and Propagation

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This paper presents a novel ultracompact narrow bandpass filter with high selectivity. The proposed filter is composed of cascading two basic cells. Each cell is basically a microstrip line loaded with a quasiplanar resonator and series gaps which can be fabricated using a standard multilayer printed circuit board technology. The structure is analyzed through an equivalent circuit and full-wave simulations. The simulation results are compared with experimental measurements demonstrating a good agreement between them. The measurement indicates that the realized bandpass filter at the center frequency of 1 GHz has a fractional bandwidth of 2.2%. Most importantly, in comparison with other similar recent works, it is shown that the proposed filter has the smallest size.

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Section: Introductionmentioning

confidence: 99%

A New Ultracompact Narrow Bandpass Microstrip Filter Using Double-Negative Quasiplanar Cells

Khawary

Nayyeri

Hashemi

et al. 2020

International Journal of Antennas and Propagation

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“…Slow-wave transmission lines are artificial lines typically consisting of a host line periodically loaded with reactive elements. 1,2 The presence of reactive elements, for example, shuntconnected capacitances, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] series-connected inductances, [18][19][20][21][22] or a combination of both reactive elements, [23][24][25][26][27] decreases the phase velocity of the line (slow-wave effect), thereby shortening the wavelength of the propagating signals. Therefore, these slow-wave artificial lines are useful for device miniaturization, as, for a required electrical length (dictated by design specifications), the physical length of such lines is shorter than the one of their ordinary counterparts.…”

Section: Introductionmentioning

confidence: 99%

“…Within these context, several works report compact microwave components with harmonic or spurious suppression capability. [31][32][33][34][35][36][37][38] Most slow-wave artificial lines and the corresponding (compact and eventually harmonic suppressed) microwave circuits have been implemented in microstrip technology, 8,9,11,14,[16][17][18]22,26,33,34 and only few of them have been designed and fabricated in coplanar waveguide (CPW) technology. 1,20,25 In Ref.…”

Section: Introductionmentioning

confidence: 99%

Compact coplanar waveguide power splitter with filtering capability based on slow‐wave structures

Vélez

Aznar-Ballesta

Coromina

et al. 2019

Micro & Optical Tech Letters

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A compact coplanar waveguide (CPW) power splitter with filtering capability is presented in this paper. The splitter consists of a pair of 70.71 Ω impedance inverters implemented by means of inductively and capacitively loaded slow‐wave structures. Such slow‐wave structures efficiently shorten the length of the inverters, thereby providing substantial size reduction to the power splitter. The filtering functionality is due to the Bragg effect, related to periodicity. The proposed splitter, designed to be functional at 1 GHz, exhibits good performance at that frequency, with measured return loss of 20.6 dB and insertion loss of 3.15 dB and 3.23 dB at the output ports. Moreover, the suppression level at the first, second and third harmonic frequency is better than 12.4 dB, 34.6 dB and 24.7 dB, respectively. As compared to the length of the ordinary inverters, the length of the constitutive slow‐wave impedance is reduced by a factor of two.

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“…The use of EBG structures for the design of microwave, millimeter-wave and terahertz filters is of special significance. Very competitive devices have been obtained in microstrip lowpass filters performing high rejection level and/or wide rejected bandwidth [35]- [38], and in microstrip and coplanar waveguide band-pass filters with spurious suppression and/or compact layout [39]- [45]. Some of the latest use periodic capacitive loaded and/or inductively loaded lines exhibiting slow-wave behavior and featuring spurious suppression and reduced size.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of One Dimensional Electromagnetic Bandgap Structures with Fully Controlled Parameters

Arnedo

Chudzik

Percaz

et al. 2017

IEEE Trans. Microwave Theory Techn.

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In this paper, we propose a novel synthesis strategy for the design of One Dimensional Electromagnetic Bandgap (1D-EBG) structures where all the performance parameters of these devices can be fully controlled, i.e., the central frequency of the forbidden band, its attenuation level and bandwidth, and the ripple level at the passbands. The novel synthesis strategy employs a new inverse scattering technique to accurately synthesize the 1D-EBG structure, targeting a properly interpolated version of a classical periodic filter fulfilling the required frequency specifications. The new inverse scattering technique follows a continuous layer peeling approach and relies on the coupled-mode theory to precisely model the microwave structures. Telecommunication and radar systems, as well as material characterization devices, will be profited by this proposal with which enhanced filters, sensors, power dividers, couplers, mixers, oscillators and amplifiers can be designed in many different technologies. As a proof of concept, a 1D-EBG structure in microstrip technology with a single forbidden band (free of spurious stopband replicas), with attenuation level of 30 dB, fractional bandwidth larger than 100%, and return loss level at the passbands of 20 dB, has been designed and fabricated. The measurements obtained are in very good agreement with the simulations and target specifications, being free of spurious replicas up to the 15th harmonic, showing the robustness and very good performance of the novel design strategy proposed.

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Design of Capacitively Loaded Coupled-Line Bandpass Filters With Compact Size and Spurious Suppression

Cited by 41 publications

References 57 publications

A New Ultracompact Narrow Bandpass Microstrip Filter Using Double-Negative Quasiplanar Cells

A New Ultracompact Narrow Bandpass Microstrip Filter Using Double-Negative Quasiplanar Cells

Compact coplanar waveguide power splitter with filtering capability based on slow‐wave structures

Synthesis of One Dimensional Electromagnetic Bandgap Structures with Fully Controlled Parameters

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