Asymmetric transversal patch loaded microstrip line based 1-D periodic structure with flexible selection of stopband resonance

Shahid, Irfan; Thalakotuna, Dushmantha; Karmokar, Debabrata K.; Heimlich, Michael

doi:10.1016/j.aeue.2019.153010

Cited by 5 publications

(6 citation statements)

References 20 publications

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“…In a conventional mushroom type EBG structure, square patches shorted at the center are used to block the propagation of electromagnetic waves [24], [25]. Rectangular patches with vias located at their edges result in a relatively compact EBG structure [26]. However, the realization of these structures is extremely challenging in size constraint MMIC environments, specially for the low frequency applications.…”

Section: Unit Cell Designmentioning

confidence: 99%

“…The equivalent circuit model of a conventional structure having a rectangular patch with two shorts is reported in [26] and is further investigated to have more insight into the circuit in a monolithic environment. The proposed equivalent circuit is developed by incorporating the effect of reactive loading on the microstrip line due to spiral inductors.…”

Section: B Circuit Analysismentioning

confidence: 99%

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A Compact Reconfigurable 1-D Periodic Structure in GaAs MMIC With Stopband Switching, Dual-Band Operation and Tuning Capabilities

Shahid¹,

Thalakotuna

Karmokar

et al. 2021

IEEE Access

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This paper presents a systematic study of a compact and reconfigurable periodic structure in GaAs MMIC technology. Compactness is achieved by the introduction of spiral inductors in a conventional unit cell without disturbing the reactive loading mechanism. The proposed architecture exhibits a 28.3% wider stopband with 62.6% smaller footprint compared to a conventional structure. The compactness and bandwidth improvement in the proposed structure is explained with the help of dispersion and circuit analysis. The reconfigurability built into the design using PIN diodes allows stopband switching, dual-band operation and tuning capabilities with the mere use of a single reactive load in its unit cell. To the best of the authors knowledge, it is the first time a reconfigurable MMIC implementation is realized using the proposed structure or even the conventional design. As a guide to design, sensitivity analysis to filter performance is presented for important structure parameters. Switching element parasitics are discussed in two ways: firstly, with the design and measurement of structures with idealized switching conditions and in second, with the circuit and full-wave EM modelling of the finite periodic structure with the actual PIN diodes. The on-chip measurements of the fully reconfigurable filter show excellent agreement with simulations.

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Section: Unit Cell Designmentioning

confidence: 99%

Section: B Circuit Analysismentioning

confidence: 99%

A Compact Reconfigurable 1-D Periodic Structure in GaAs MMIC With Stopband Switching, Dual-Band Operation and Tuning Capabilities

Shahid¹,

Thalakotuna

Karmokar

et al. 2021

IEEE Access

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“…Another advantage of these structures is its suitability for a wide range of two metal layer GaAs and GaN MMIC fabrication processes for implementation of stopband filters in which it is extremely difficult to fabricate DGS. While there are studies done on analyzing such periodic structures, using circuit models [17]- [19], to determine filter characteristics as a function of physical design parameters. But there has been very limited research on synthesizing a filter using this type of periodic structure to give the reverse: physical design parameters as a function of desired performance.…”

Section: Introduction P Periodic Structures Offering Ebg Charactermentioning

confidence: 99%

“…The baseline EBG structure discussed in this work has been extensively used in literature [17]- [21], [23], [25], [29]- [32]. The unit cell configuration of the structure is slightly changed while maintaining the underlying EBG mechanism to achieve advanced features like dual stopband performance [21], [32], compactness [19], etc. However, the novelty of this study is the development of closed-form equations for baseline rectangular patch structures which are shorted from both ends, not proposing a new structure.…”

Section: Introduction P Periodic Structures Offering Ebg Charactermentioning

confidence: 99%

Bandstop Filter Synthesis Scheme for Reactively Loaded Microstrip Line Based 1-D Periodic Structures

et al. 2020

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A 1-D finite electromagnetic bandgap (EBG) periodic structure is studied. In the structure, EBG behaviour arises from a unit cell comprised of a metallic patch sandwiched between microstrip line and ground plane. Reactive loading offered by patch size determines the bandgap position. A detailed parametric study of various physical structure parameters is presented as a basis to develop a interrelation between physical parameters of the structure and cutoff frequencies. Closed-form synthesis equations are then formulated using curve fitting techniques. Subsequently, a step-by-step design methodology is presented to get a close first pass approximation of structure dimensions for a given specification. This design method reduces the effort required for a designer to perform extensive electromagnetic simulations at early stages of the design. The proposed synthesis method is tested for a variety of commercially available substrates and different frequency ranges for validation. Comparison with electromagnetic (EM) simulations and measurement show that the proposed synthesis method provides first pass approximation of the physical structure dimensions with 94% accuracy. INDEX TERMS Bandstop filter, electromagnetic bandgap, filter design, microstrip line, periodic structure.

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“…Several examples illustrating this approach are discussed in [1] and references therein. On the other hand, periodic structures of this type (i.e., electromagnetic bandgap-EBG-filters and other similar configurations) have also been used extensively to implement single-ended stopband filters (see, for instance, [14], [15] and references therein). However, it has not been until very recently that the advantages of introducing glide symmetry in the unit cell of such kind of devices has been explored.…”

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confidence: 99%

Glide Symmetry Applied to Printed Common-Mode Rejection Filters

Mouris

Fernández‐Prieto

Rio

et al. 2022

IEEE Trans. Microwave Theory Techn.

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In this article, we present a novel application of glide symmetry to differential lines with common-mode (CM) rejection filter properties. Two different topologies are investigated. First, glide symmetry is applied to a pair of differential lines where ground-connected mushrooms are employed as a CM rejection structure. The same idea is also used in a pair of differential lines where defective ground structures are introduced to stop the CM propagation. It is demonstrated that the CM rejection bandwidth is drastically increased when glide symmetry is exploited in both topologies when compared with their corresponding structures without glide symmetry. Furthermore, we show that the differential-mode propagation is hardly affected by the use of glide symmetry, ensuring the good integrity of the transmitted information. Experimental demonstration for both mushroom and defected ground structure is provided. Good agreement between simulations and measurements results is observed.

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Asymmetric transversal patch loaded microstrip line based 1-D periodic structure with flexible selection of stopband resonance

Cited by 5 publications

References 20 publications

A Compact Reconfigurable 1-D Periodic Structure in GaAs MMIC With Stopband Switching, Dual-Band Operation and Tuning Capabilities

A Compact Reconfigurable 1-D Periodic Structure in GaAs MMIC With Stopband Switching, Dual-Band Operation and Tuning Capabilities

Bandstop Filter Synthesis Scheme for Reactively Loaded Microstrip Line Based 1-D Periodic Structures

Glide Symmetry Applied to Printed Common-Mode Rejection Filters

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