Miniature low-loss CPW periodic structures for filter applications

Sor, J.; Qian, Yongxi; Itoh, T.

doi:10.1109/22.971618

Cited by 114 publications

(60 citation statements)

References 16 publications

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“…Microwave periodic structures have gained increasing attention during last few decades due to their interesting propagation characteristics [1,2]. The upper and lower limits of the bandgap (or stopband) of such a microwave structure depend on the lattice structure, periodicity (lattice constant) and the geometrical configuration of the unit cell.…”

Section: Introductionmentioning

confidence: 99%

Equivalent-Circuit Models for Efficient Transmission and Dispersion Analyses of Multi-State Periodic Structures

Matekovits

Thalakotuna²,

Hay

et al. 2015

PIER

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Abstract-An equivalent-circuit model for a reconfigurable unit cell is proposed. This circuit model facilitates fast prediction of scattering parameters and dispersion analyses of a reconfigurable periodic structure. The cutoff frequencies obtained using equivalent-circuit models are in excellent agreement with those from measurements and full-wave numerical simulations. The proposed circuit model is then modified to include non-ideal, commercial RF FET switches. The effect of such a switch in each state, On or Off, is modeled by a frequency-dependant impedance, derived from the scattering parameters of the switch. The proposed technique can be used to analyze a reconfigurable periodic structure with any type of switches. For the structure with 24 unit cells considered here, the equivalent circuit model is about five orders of magnitude faster than full-wave simulations.

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Section: Introductionmentioning

confidence: 99%

Equivalent-Circuit Models for Efficient Transmission and Dispersion Analyses of Multi-State Periodic Structures

Matekovits

Thalakotuna²,

Hay

et al. 2015

PIER

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“…By means of this capacitive loading, the effective capacitance of the line is enhanced and the phase velocity is reduced. Slow-wave transmission lines have found applications in microwave circuit miniaturization [2][3][4]. However, due to periodicity, these structures exhibit stop bands, which are of interest for spurious suppression.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of slow-wave structures based on capacitive-loaded lines through aggressive space mapping (ASM)

Orellana

Selga

Sans

et al. 2015

Int J RF and Microwave Comp Aid Eng

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This paper is focused on the automated synthesis of slow-wave structures based on microstrip lines loaded with patch capacitors. Thanks to the presence of the shunt capacitors, the effective capacitance of the line is enhanced, and the phase velocity of the structure can be made significantly smaller than the one of the unloaded line. The target is to achieve the layout of the slow-wave structure able to provide the required slow-wave ratio, characteristic (Bloch) impedance and electrical length (i.e., the usual specifications in the design of slow-wave transmission lines). To this end, a two-step synthesis method, based on the aggressive space mapping (ASM) algorithm, is proposed for the first time. Through the first ASM algorithm, the circuit schematic providing the target specifications is determined. Then, the second ASM optimizer is used to generate the layout of the structure. In order to illustrate the potential of the proposed synthesis method, three application examples are successfully reported. The two-step ASM algorithm is able to provide the layout of the considered structures from the required specifications, without the need of an external aid in the process.

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“…In coplanar waveguide technology, uniplanar EBG structures have been recently proposed for the fabrication of filters and resonators based on the perturbation of line geometry [19], and EBG effects have been experimentally demonstrated where perturbation is implemented by etching patterns in the ground plane following a periodic structure [20]. Also, a miniaturized low pass filter has been recently proposed based on the slow wave effect and stop band characteristics of a CPW structure with capacitive and inductive coupling at periodic positions [21].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Reflection Properties in Electromagnetic Bandgap Coplanar Waveguides Loaded with Reactive Elements

Martín¹,

Falcone²,

Bonache³

et al. 2003

PIER

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Abstract-In this work, we study the reflection properties of coplanar waveguides (CPW) periodically loaded with shunt connected capacitances and periodically perturbed by varying the slot width. These structures are of interest because the low pass frequency response with spurious frequency bands, inherent to the presence of capacitors, can be improved. This is achieved through the attenuation of frequency parasitics that is obtained by the introduction of slot width modulation. Both sinusoidal and square wave patterns are considered and the effects of the relative position of reactive elements with regard to the perturbation geometry is analysed. According to coupled mode theory, the central frequencies of the rejected bands in periodic transmission media are given by the spectrum of the perturbation function. However, it is demonstrated that, due to the presence of capacitors, multiple spurious bands can be simultaneously suppressed even in the case of a singly tuned (sinusoidal) perturbation geometry. This result points out that the frequency selective behaviour associated to the presence of slot width modulation can not be interpreted in the framework of coupled mode theory, since the rejection of spurious bands in periodic loaded CPWs is not merely given by the spectrum of the perturbation geometry.

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Miniature low-loss CPW periodic structures for filter applications

Cited by 114 publications

References 16 publications

Equivalent-Circuit Models for Efficient Transmission and Dispersion Analyses of Multi-State Periodic Structures

Equivalent-Circuit Models for Efficient Transmission and Dispersion Analyses of Multi-State Periodic Structures

Synthesis of slow-wave structures based on capacitive-loaded lines through aggressive space mapping (ASM)

Analysis of the Reflection Properties in Electromagnetic Bandgap Coplanar Waveguides Loaded with Reactive Elements

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