Design optimisation of ring elements for broadband reflectarray antennas

Misran, Norbahiah; Cahill, R.; Fusco, Vincent

doi:10.1049/ip-map:20030857

Cited by 80 publications

(52 citation statements)

References 10 publications

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“…Different types of reflectarray elements have been proposed to improve the element bandwidth in printed reflectarrays, including stacked rectangular [3], [4] and ring [5] patches, double crossed loops [6], and patches with other shapes [7].…”

Section: Introductionmentioning

confidence: 99%

Bandwidth Improvement in Large Reflectarrays by Using True-Time Delay

Carrasco

Encinar

Barba

2008

IEEE Trans. Antennas Propagat.

191

111

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Abstract-A significant improvement in the bandwidth of large reflectarrays is demonstrated using elements which allow true-time delay. Two identical, large reflectarrays have been designed using different phase distributions to generate a collimated beam. In the former, the phase distribution is truncated to 360° as is usual in reflectarray antennas, while in the second, the true phase delay is maintained (three cycles of 360°). The chosen phase-shifter elements are based on previously measured and validated patches aperture-coupled to delay lines. The radiation patterns for both reflectarrays have been computed at several frequencies and the gain is represented as a function of frequency for both cases. Bandwidth curves are presented as a function of the reflectarray size.

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Section: Introductionmentioning

confidence: 99%

Bandwidth Improvement in Large Reflectarrays by Using True-Time Delay

Carrasco

Encinar

Barba

2008

IEEE Trans. Antennas Propagat.

191

111

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“…The phase versus frequency curve of grounded FSS is more linear so no need of tight fabrication tolerances like patch antenna. The proposed periodic array structure can be printed on a single substrate surface; double-side mask alignment is not needed [11]. The structure is the superior alternative to other broadband elements as the construction of the structure is very much simpler and cheaper.…”

Section: Introductionmentioning

confidence: 99%

Passive Frequency Selective Surface Array as a Diffuser for Destroying Millimeter Wave Coherence

Islam

Stiens

Poesen

et al. 2008

Active and Passive Electronic Components

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This paper presents the design, construction, and testing of grounded frequency selective surface (FSS) array as a diffuser for destroying millimeter wave coherence which is used to eliminate speckle in active millimeter wave imaging. To create stochastically independent illumination patterns, we proposed a diffuser based on random-phase distributions obtained by changing the incident frequency. The random-phase diffuser was obtained by mixing up the phase relations between the cells of a deterministic function (e.g., beam splitter). The slot length of FSS is the main design parameter used to optimize the phase shifting properties of the array. The critical parameters of the diffuser array design, such as phase relation with slot lengths, losses, and bandwidth, are discussed. We designed the FSS arrays with finite integral technique (FIT), fabricated by etching technique, and characterized the S-parameters with a free-space MVNA, and measured the radiation patterns with a BWO in motorized setup.

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“…To overcome this shortfall, multilayers of double concentric annular-rings are suggested in [7], but the linear response over a phase range > 360 • is not achievable in this case. For optimum performance, the separation between concentric annular-rings must be reduced which is not applicable in practical design.…”

Section: Introductionmentioning

confidence: 99%

Modified Phasing Element for Broadband Reflectarray Antennas

Elshennawy¹,

Attiya²

2017

PIER C

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Abstract-New phasing element for a wideband microstrip reflectarray is presented. It is formed by a phase-delay line attached to a circular ring loaded with a circular disc microstrip. The structure is enclosed by a circular ring element with a pair of gaps. It is shown that the new phasing element offers a wider bandwidth with an increased phasing range that is useful in reflectarrays phase compensation procedure. Full wave EM simulations are carried out. Good agreement exists between simulation results and measurements by using waveguide simulator method. The mutual coupling effect for a realistic reflectarray configuration with non-identical cells is accounted for by using the perturbation technique.

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Design optimisation of ring elements for broadband reflectarray antennas

Cited by 80 publications

References 10 publications

Bandwidth Improvement in Large Reflectarrays by Using True-Time Delay

Bandwidth Improvement in Large Reflectarrays by Using True-Time Delay

Passive Frequency Selective Surface Array as a Diffuser for Destroying Millimeter Wave Coherence

Modified Phasing Element for Broadband Reflectarray Antennas

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