Analytical Investigation of Periodic Coplanar Waveguides

Chen, Teng-Kai; Huff, Gregory H.

doi:10.2528/pierm13032110

Cited by 9 publications

(4 citation statements)

References 26 publications

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“…A spiral can be operated at resonance, at a lower frequency than its travelling wave mode, by interconnecting the arms in the middle, and viewing each as a quarter wave resonator – neglecting secondary effects such as fringing fields and inter‐element coupling. For this Letter, the arms are modelled as periodic coplanar waveguide stubs [8]. Following the general synthesis method of stub filters a metal spiral's arms terminate in an open circuit, Fig.…”

Section: Single‐band Spiral Designmentioning

confidence: 99%

Dual‐band frequency selective surfaces based on multi‐arm sub‐wavelength Archimedean spirals

Kelley¹,

Huff²

2015

Electron. lett.

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Two design strategies are presented to create dual-band frequency selective surfaces based on multi-arm Archimedean spirals. A single-band element is first presented as the basis for the surface. The individual arm lengths of the spirals are utilised as the primary design parameter to synthesise the passband and stopband responses. The first approach uses a lattice of four-arm spirals with alternating sizes, and the second combines these into an eight-arm uniform lattice of elements. Measured and simulated results are included for a fabricated S-band prototype of each topology to demonstrate the basic design strategies.Introduction: The ubiquitous use of wireless technologies in communications, sensing, and automation has thrown light on many new applications of frequency selective surfaces (FSSs). This includes the design of electromagnetic architectures in buildings and other spaces to enhance information security, control wireless coverages, and provide a number of other functionalities which extend the use of the FSS beyond more traditional applications such as radome design, antenna sub-reflectors, radar cross-section reduction, and electromagnetic interference reduction [1][2][3]. Fundamentally, the FSS acts as a spatial filter for electromagnetic waves the unit cell configuration of which governs its frequency response. There are a number of singleand multi-band design strategies as well as frequency tuning. Some recent examples of multi-band designs use fractal FSSs [4] or passive structures [5] that use reactive loading mechanisms to alter their frequency response.In general, the synthesis of a FSS unit element can present many challenges. Iterative approaches using numerical simulations can be used to explore the design space, but they offer little physical insight into the fundamental operation of the structure when the topology is geometrically complex and/or sub-wavelength. This Letter examines the topology of the Archimedean spiral as a sub-wavelength resonant element from which first principles are used to predict the approximate passband or stopband response. Other work has been done on Archimedean spiral FSSs [6,7], but the focus has been on an experimentally quantitative analysis of the surface's polarisation properties. However, it is possible to synthesise a dual-band response by only manipulating the geometry of the unit cell(s). In this Letter, the synthesis of a single-band structure is examined first along with its complementary topology to link the geometry to the performance metrics of the FSS. Next is a discussion of two approaches for creating a dual-band structure, where simulated and measured results are included for each of the design procedures. The Letter concludes with a brief discussion on the performance of the two designs, and the extension of the concepts to other related topologies.

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Section: Single‐band Spiral Designmentioning

confidence: 99%

Dual‐band frequency selective surfaces based on multi‐arm sub‐wavelength Archimedean spirals

Kelley¹,

Huff²

2015

Electron. lett.

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“…Spiral elements are circularly-polarized [14,15] and are utilized in this study to mitigate detuning and response degradation caused by angular and polarization dependency, observed in linearly-polarized elements on folded surfaces [1,2]. A densely packed spiral lattice is printed on each facet of the Miura-ori pattern, to further reduce the angular dependency.…”

Section: Introductionmentioning

confidence: 99%

Origami-Inspired Frequency Selective Surface with Fixed Frequency Response under Folding

Sessions

Cook

Fuchi

et al. 2019

Sensors

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Filtering of electromagnetic signals is key for improved signal to noise ratios for a broad class of devices. However, maintaining filter performance in systems undergoing large changes in shape can be challenging, due to the interdependency between element geometry, orientation and lattice spacing. To address this challenge, an origami-based, reconfigurable spatial X-band filter with consistent frequency filtering is presented. Direct-write additive manufacturing is used to print metallic Archimedean spiral elements in a lattice on the substrate. Elements in the lattice couple to one another and this results in a frequency selective surface acting as a stop-band filter at a target frequency. The lattice is designed to maintain the filtered frequency through multiple fold angles. The combined design, modeling, fabrication, and experimental characterization results of this study provide a set of guidelines for future design of physically reconfigurable filters exhibiting sustained performance.

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“…The three-column energy-saving technique has been successfully implemented to recover DMF from PU synthetic leather processes [5]. It was shown that the recycle stream design can effectively reduce the energy consumption by 37.7 % and the achieved purity of the DMF product can be above 99.9 %.…”

Section: Introductionmentioning

confidence: 99%

Economic and Risk Analyses of an Industrial N,N‐Dimethylformamide Recovery Process

Shi

et al. 2019

Chem Eng & Technol

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The industrial N,N-dimethylformamide (DMF) recovery plant is usually based on a two-column sequence (TCS) and the capacity of the wastewater treatment process is larger than 2000 kg h -1 . Here, a dividing-wall column (DWC)-based DMF recovery plant is proposed. The DWC avoids the remixing effect and reduces the utility duties by about 18.1 % and the CO 2 emissions by 15.2 %, compared to the TCS. The DWC effectively decreases the total annual cost by 3.4 % compared to that of the TCS and achieves a profitability index of 2.19 and an internal rate of return of 40.45 %. By Monte Carlo risk analysis, the DWC can increase the chance of earning the profit by up to 16 % compared to the TCS.

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Analytical Investigation of Periodic Coplanar Waveguides

Cited by 9 publications

References 26 publications

Dual‐band frequency selective surfaces based on multi‐arm sub‐wavelength Archimedean spirals

Dual‐band frequency selective surfaces based on multi‐arm sub‐wavelength Archimedean spirals

Origami-Inspired Frequency Selective Surface with Fixed Frequency Response under Folding

Economic and Risk Analyses of an Industrial N,N‐Dimethylformamide Recovery Process

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