Novel approach for low-loss reflectarray designs

Ethier, Jonathan; Chaharmir, M.R.; Shaker, J.

doi:10.1109/aps.2011.5996721

Cited by 16 publications

(17 citation statements)

References 15 publications

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“…The enhancement of the capacitance at a fixed frequency with fixed substrate parameters, leads to a strong reduction of the [24], [25] with a parametric analysis.…”

Section: ) Square Patch Array Fss Element With Variable Gap and Variamentioning

confidence: 98%

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Closed-Form Analysis of Reflection Losses in Microstrip Reflectarray Antennas

Costa

Monorchio

2012

IEEE Trans. Antennas Propagat.

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Microstrip reflectarray antennas consist of a grounded quasi-periodic array of printed elements able to compensate the phase displacement of a non-coherent electromagnetic excitation generated by a feeder. The design of reflectarray antennas is usually accomplished by tracing the reflection phase diagram of the periodic version of the printed surface, which is analogous to a high-impedance surface (HIS). Reflection losses of this periodic structure are here analyzed through a simple equivalent transmission line model. The analytical expressions of the surface impedance offered by a HIS (real and imaginary part) as a function of the imaginary part of the dielectric permittivity of the substrate are derived through well justified approximations. Some useful practical examples are then presented both for verifying the accuracy of the derived closed-form expressions and for studying the effect of the geometrical and electrical parameters of the periodic surface on the reflection losses. The dependence of the input impedance on the capacitance associated with the printed pattern is highlighted, demonstrating that highly capacitive elements (tightly coupled subwavelength elements) are preferable for minimizing reflection losses

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“…The enhancement of the capacitance at a fixed frequency with fixed substrate parameters, leads to a strong reduction of the [24], [25] with a parametric analysis.…”

Section: ) Square Patch Array Fss Element With Variable Gap and Variamentioning

confidence: 98%

“…Its expression is the following: (24) The TE FSS resistance increases proportionally to the incidence angle.…”

Section: Oblique Incidencementioning

confidence: 99%

Closed-Form Analysis of Reflection Losses in Microstrip Reflectarray Antennas

Costa

Monorchio

2012

IEEE Trans. Antennas Propagat.

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“…It will be shown that the use of subwavelength coupled-resonant elements (hereafter known simply as sub-wavelength elements) dramatically reduces the losses in reflectarray designs. Sub-wavelength elements are used in FSS structures [5] [11]. These authors have noted that reflectarray bandwidth is improved when using sub-wavelength patches as opposed to resonant patches.…”

Section: Introductionmentioning

confidence: 97%

“…In this work, we propose a sub-wavelength element that has the desired phase range and reasonable etching tolerances while being restricted to a less complicated single layer design. Our prior work in [11] mainly focused on the reflectarray gain performance using sub-wavelength elements on lossy substrates, while in this work we shall explore the details of the loss reduction mechanism including the relationship between dispersion and loss as well as the behaviour of the near fields of resonant and sub-wavelength elements. To the best of our knowledge, the efficiency of the sub-wavelength reflectarray element has not been fully explored in the literature which will be the focus of this paper.…”

Section: Introductionmentioning

confidence: 99%

Loss Reduction in Reflectarray Designs Using Sub-Wavelength Coupled-Resonant Elements

Ethier

Chaharmir

Shaker

2012

IEEE Trans. Antennas Propagat.

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A novel design approach is proposed for designing high performance reflectarrays using low-cost, lossy substrates. Using sub-wavelength coupled-resonant elements, in particular sub-wavelength loops, one can dramatically reduce losses in reflectarrays and not incur significant gain drop due to the use of the lossy, low-cost substrate. It is further shown that the subwavelength loop achieves sufficient phase variation in a single layer design with a modest requirement in etching tolerance, making the loop superior to both the single and double-layer subwavelength patch elements.

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“…CIRCUIT EQUIVALENT OF REFLECTARRAY CELL ELEMENT Subwavelength elements have been introduced in order to enhance reflectarray performance [2,3]. To alleviate tight fabrication tolerances of the elements, the square loop element was introduced in [4]. The term subwavelength coupled resonant was devised to define such elements in order to signify the small size of their lattice and also the physical mechanism that is responsible for resonance, which is the coupling between elements as opposed to self resonance of the element.…”

Section: Introductionmentioning

confidence: 99%

New developments in reflectarray research at the Communications Research Centre Canada (CRC)

Ethier

Chaharmir

Shaker

2012

2012 15 International Symposium on Antenna Technology and Applied Electromagnetics

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Full Paper -New developments in reflectarray research at the Communications Research Centre Canada will be presented. These developments focus on many areas such as: development of efficient methods for analysis and synthesis of reflectarrays, innovative cell elements, low cost, and wideband reflectarray. The paper gives a brief overview of these topics and a more detailed presentation will be given at the conference.

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Novel approach for low-loss reflectarray designs

Cited by 16 publications

References 15 publications

Closed-Form Analysis of Reflection Losses in Microstrip Reflectarray Antennas

Closed-Form Analysis of Reflection Losses in Microstrip Reflectarray Antennas

Loss Reduction in Reflectarray Designs Using Sub-Wavelength Coupled-Resonant Elements

New developments in reflectarray research at the Communications Research Centre Canada (CRC)

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