Reflector synthesis for wide-scanning focal plane arrays

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Uittreksel

A new complex offset double-reflector configuration for a wideband focal plane array (FPA) is presented which is optimized for Ka-band applications with a scan range of ±20° in the azimuth plane. This configuration is obtained by using a mathematical framework based on geometrical optics which allow us to optimize complex double-reflector FPAs with limited computational effort. The proposed reflector configuration maximizes the number of simultaneously active array elements of the phased-array feed and minimizes the required total number of array elements for this wide scan range. To realize an aperture efficiency of at least 80% at 30 GHz, our concept allows half of the antenna elements in the array to be active during scanning for a scan range of ±10° and at least a quarter of the array elements to be active for a scan range of ±20°. This is a major improvement as compared to the scanning capabilities of focal-plane arrays based on conventional single- and double-parabolic reflector configurations. In addition, the FPA configuration has been optimized for wideband optical true-time-delay beamforming which requires a linear phase distribution along the array elements. We obtained a phase linearity with rms error of 2.81° at 30 GHz. The experiments from the realized prototype demonstrate a good agreement between simulation and measurements and fully prove the required scanning performance over a ±20° scan range. The prototype demonstrates a high directivity up to 46 dBi at 30 GHz and 48 dBi at 40 GHz and reflector efficiency up to 83% at 30 GHz and 77% at 40 GHz.

TaalEngels
Artikelnummer8621011
Pagina's2305-2319
Aantal pagina's15
TijdschriftIEEE Transactions on Antennas and Propagation
Volume67
Nummer van het tijdschrift4
DOI's
StatusGepubliceerd - 1 apr 2019

Vingerafdruk

Focal plane arrays
Scanning
Geometrical optics
Beamforming
Time delay
Antennas
Experiments

Trefwoorden

    Citeer dit

    @article{6732ff4e411943c19ad06474f12f5259,
    title = "Reflector synthesis for wide-scanning focal plane arrays",
    abstract = "A new complex offset double-reflector configuration for a wideband focal plane array (FPA) is presented which is optimized for Ka-band applications with a scan range of ±20° in the azimuth plane. This configuration is obtained by using a mathematical framework based on geometrical optics which allow us to optimize complex double-reflector FPAs with limited computational effort. The proposed reflector configuration maximizes the number of simultaneously active array elements of the phased-array feed and minimizes the required total number of array elements for this wide scan range. To realize an aperture efficiency of at least 80{\%} at 30 GHz, our concept allows half of the antenna elements in the array to be active during scanning for a scan range of ±10° and at least a quarter of the array elements to be active for a scan range of ±20°. This is a major improvement as compared to the scanning capabilities of focal-plane arrays based on conventional single- and double-parabolic reflector configurations. In addition, the FPA configuration has been optimized for wideband optical true-time-delay beamforming which requires a linear phase distribution along the array elements. We obtained a phase linearity with rms error of 2.81° at 30 GHz. The experiments from the realized prototype demonstrate a good agreement between simulation and measurements and fully prove the required scanning performance over a ±20° scan range. The prototype demonstrates a high directivity up to 46 dBi at 30 GHz and 48 dBi at 40 GHz and reflector efficiency up to 83{\%} at 30 GHz and 77{\%} at 40 GHz.",
    keywords = "Antenna array, effective isotropic radiated power (EIRP), focal-plane arrays (FPAs), geometrical optics (GO) modeling, millimeter-waves (mm-waves), reflector antennas, wide scan range",
    author = "Aleksei Dubok and Ali Al-Rawi and Giampiero Gerini and Smolders, {A. Bart}",
    year = "2019",
    month = "4",
    day = "1",
    doi = "10.1109/TAP.2018.2889136",
    language = "English",
    volume = "67",
    pages = "2305--2319",
    journal = "IEEE Transactions on Antennas and Propagation",
    issn = "0018-926X",
    publisher = "Institute of Electrical and Electronics Engineers (IEEE)",
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    Reflector synthesis for wide-scanning focal plane arrays. / Dubok, Aleksei (Corresponding author); Al-Rawi, Ali; Gerini, Giampiero; Smolders, A. Bart.

    In: IEEE Transactions on Antennas and Propagation, Vol. 67, Nr. 4, 8621011, 01.04.2019, blz. 2305-2319.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    TY - JOUR

    T1 - Reflector synthesis for wide-scanning focal plane arrays

    AU - Dubok,Aleksei

    AU - Al-Rawi,Ali

    AU - Gerini,Giampiero

    AU - Smolders,A. Bart

    PY - 2019/4/1

    Y1 - 2019/4/1

    N2 - A new complex offset double-reflector configuration for a wideband focal plane array (FPA) is presented which is optimized for Ka-band applications with a scan range of ±20° in the azimuth plane. This configuration is obtained by using a mathematical framework based on geometrical optics which allow us to optimize complex double-reflector FPAs with limited computational effort. The proposed reflector configuration maximizes the number of simultaneously active array elements of the phased-array feed and minimizes the required total number of array elements for this wide scan range. To realize an aperture efficiency of at least 80% at 30 GHz, our concept allows half of the antenna elements in the array to be active during scanning for a scan range of ±10° and at least a quarter of the array elements to be active for a scan range of ±20°. This is a major improvement as compared to the scanning capabilities of focal-plane arrays based on conventional single- and double-parabolic reflector configurations. In addition, the FPA configuration has been optimized for wideband optical true-time-delay beamforming which requires a linear phase distribution along the array elements. We obtained a phase linearity with rms error of 2.81° at 30 GHz. The experiments from the realized prototype demonstrate a good agreement between simulation and measurements and fully prove the required scanning performance over a ±20° scan range. The prototype demonstrates a high directivity up to 46 dBi at 30 GHz and 48 dBi at 40 GHz and reflector efficiency up to 83% at 30 GHz and 77% at 40 GHz.

    AB - A new complex offset double-reflector configuration for a wideband focal plane array (FPA) is presented which is optimized for Ka-band applications with a scan range of ±20° in the azimuth plane. This configuration is obtained by using a mathematical framework based on geometrical optics which allow us to optimize complex double-reflector FPAs with limited computational effort. The proposed reflector configuration maximizes the number of simultaneously active array elements of the phased-array feed and minimizes the required total number of array elements for this wide scan range. To realize an aperture efficiency of at least 80% at 30 GHz, our concept allows half of the antenna elements in the array to be active during scanning for a scan range of ±10° and at least a quarter of the array elements to be active for a scan range of ±20°. This is a major improvement as compared to the scanning capabilities of focal-plane arrays based on conventional single- and double-parabolic reflector configurations. In addition, the FPA configuration has been optimized for wideband optical true-time-delay beamforming which requires a linear phase distribution along the array elements. We obtained a phase linearity with rms error of 2.81° at 30 GHz. The experiments from the realized prototype demonstrate a good agreement between simulation and measurements and fully prove the required scanning performance over a ±20° scan range. The prototype demonstrates a high directivity up to 46 dBi at 30 GHz and 48 dBi at 40 GHz and reflector efficiency up to 83% at 30 GHz and 77% at 40 GHz.

    KW - Antenna array

    KW - effective isotropic radiated power (EIRP)

    KW - focal-plane arrays (FPAs)

    KW - geometrical optics (GO) modeling

    KW - millimeter-waves (mm-waves)

    KW - reflector antennas

    KW - wide scan range

    UR - http://www.scopus.com/inward/record.url?scp=85064271170&partnerID=8YFLogxK

    U2 - 10.1109/TAP.2018.2889136

    DO - 10.1109/TAP.2018.2889136

    M3 - Article

    VL - 67

    SP - 2305

    EP - 2319

    JO - IEEE Transactions on Antennas and Propagation

    T2 - IEEE Transactions on Antennas and Propagation

    JF - IEEE Transactions on Antennas and Propagation

    SN - 0018-926X

    IS - 4

    M1 - 8621011

    ER -