The Generalized Direct Optimization Technique for Printed Reflectarrays

Zhou, Min; Sørensen, Stig B.; Kim, Oleksiy S.; Jørgensen, Erik; Meincke, Peter; Breinbjerg, Olav; Toso, Giovanni

doi:10.1109/tap.2013.2254446

Cited by 48 publications

(30 citation statements)

References 21 publications

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“…This can be achieved either with a single layer of square patches [32], or with concentric squared loops and patches [33]. The use of this technique has made it possible to achieve a cross-polar discrimination (XPD) of 27 dB in a 20% bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Reflectarray Antennas for Dual Polarization and Broadband Telecom Satellite Applications

Florencio

Encinar

Boix

et al. 2015

IEEE Trans. Antennas Propagat.

153

127

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Abstract-A reflectarray antenna with improved performance is proposed to operate in dual-polarization and transmit-receive frequencies in Ku-band for broadcast satellite applications. The reflectarray element contains two orthogonal sets of four coplanar parallel dipoles printed on two surfaces, each set combining lateral and broadside coupling. A 40-cm prototype has been designed, manufactured and tested. The lengths of the coupled dipoles in the reflectarray cells have been optimized to produce a collimated beam in dual polarization in the transmit and receive bands. The measured radiation patterns confirm the high performance of the antenna in terms of bandwidth (27%), low losses and low levels of cross polarization. Some preliminary simulations at 11.95 GHz for a 1.2-m antenna with South American coverage are presented to show the potential of the proposed antenna for spaceborne antennas in Ku-band.

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Section: Introductionmentioning

confidence: 99%

Reflectarray Antennas for Dual Polarization and Broadband Telecom Satellite Applications

Florencio

Encinar

Boix

et al. 2015

IEEE Trans. Antennas Propagat.

153

127

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“…For the minimization of the distance in (22), at this stage we have the element m as the trimmed gain G (u, v) and the current reflectarray geometry which generates a gain pattern that belongs to the R set, G(u, v). As a distance definition, the Euclidean norm for square-integrable functions can be used, which can be easily implemented by the weighted Euclidean metric…”

Section: B Backward Projectionmentioning

confidence: 99%

“…As stated in the previous section, due to the similarity between (24) and (26), the LMA is a natural choice to minimize the distance in (22), and in fact will be the minimizing algorithm used here. However, other gradient-based algorithms are also suitable, such as steepest descent [38], Gauss-Newton [39] or self-scaled BFGS [40] by setting up an appropriate cost function [28].…”

Section: Minimization Algorithm For the Geometry Optimizationmentioning

confidence: 99%

Efficient Crosspolar Optimization of Shaped-Beam Dual-Polarized Reflectarrays Using Full- Wave Analysis for the Antenna Element Characterization

Prado

Arrebola

Pino

et al. 2017

IEEE Trans. Antennas Propagat.

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A method for the optimization of the crosspolar component of dual-polarized reflectarrays using full-wave analysis at the element level is described and demonstrated. The reflectarray full-wave analysis is based on local periodicity and integrated within the optimization process in order to accurately characterize the crosspolar far field. The proposed method is based on the generalized Intersection Approach framework using the Levenberg-Marquardt Algorithm as backward projector, and the employed full-wave analysis is based on the Method of Moments assuming local periodicity (MoM-LP). Several strategies to accelerate the computations are exploited, such as the parallelization of all the algorithm building blocks. To minimize the impact of MoM-LP in the optimization process, a strategy to reduce the number of MoM-LP calls is described, further accelerating the algorithm. Moreover, the convergence is improved by working with the squared field amplitude, alleviating the trap problem of local optimizers. This method allows to optimize the crosspolar component in the whole visible region or only in the coverage zone to facilitate the convergence, reduce computing time and memory usage. Two test cases are provided to validate the technique, one with an isoflux pattern for global Earth coverage and another with European coverage for DBS application.

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“…is used to update the velocity and the position of the coefficients (

α_{x_i j}

β_{x_i j}

, and

γ_{x_i j}

) as a function of: (1) their previous velocity

\bar{v} true(t - 1 true)

, (2) their previous position

\bar{k} true(t - 1 true)

, (3) the best experience (position) of personal

{\overset{P}{true}}_{k} true(t - 1 true)

, and (4) the best experience of group

{\overset{G}{true}}_{k} true(t - 1 true)

. The so called “personal” and “group” are widely used in PSO optimization algorithm . While one step is done and the coefficients move toward a new position with new velocity, (or equivalently, coefficients get new values) these coefficients are used to calculate the radiation fields of the antenna.…”

Section: Synthesis Proceduresmentioning

confidence: 99%

Optimum design of dual band shaped-beam circularly polarized reflectarray antenna based on physical optic method

Karimipour

Komjani

Abdolali

et al. 2016

Int J RF and Microwave Comp Aid Eng

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A shaped‐beam dual‐band reflectarray (RA) with shared aperture is designed and simulated in this communication. Desired radiation patterns are considered squared cosecant and pencil beam in elevation and azimuth planes for both bands, respectively. This antenna has been designed to operate at X‐Band (9.6–10.9 GHz) with left‐hand circular polarization and K‐Band (19.1–21.6 GHz) with right‐hand circular polarization. A thin layer of Frequency Selective Surface is used as a band separator to reduce mutual coupling between two frequency bands. A cross dipole with variable arc‐shape delay line, which has very low cross polarization, is used as the radiation element for both bands. The capability of operating in different polarizations is an advantage of the proposed element. To obtain shaped‐beam pattern for both bands, an optimization method based on physical optic is adopted. In the synthesis method, far‐field radiation patterns are evaluated as a function of the tangential electric field components on the reflecting surface. Lower and higher band RAs are implemented on 30 × 30 cm2 and 18 × 18 cm2 Rogers 4003 substrate, respectively. Finally, the whole structure is simulated with CST software and shows a good agreement between the simulation and the ideal patterns at two bands. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:690–702, 2016.

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The Generalized Direct Optimization Technique for Printed Reflectarrays

Abstract: Abstract-A generalized direct optimization technique (GDOT)for

Cited by 48 publications

References 21 publications

Reflectarray Antennas for Dual Polarization and Broadband Telecom Satellite Applications

Reflectarray Antennas for Dual Polarization and Broadband Telecom Satellite Applications

Efficient Crosspolar Optimization of Shaped-Beam Dual-Polarized Reflectarrays Using Full- Wave Analysis for the Antenna Element Characterization

Optimum design of dual band shaped-beam circularly polarized reflectarray antenna based on physical optic method

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