Reflector synthesis for wide-scanning focal plane arrays

Research output: Contribution to journalArticleAcademicpeer-review

30 Downloads (Pure)

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.

Original languageEnglish
Article number8621011
Pages (from-to)2305-2319
Number of pages15
JournalIEEE Transactions on Antennas and Propagation
Volume67
Issue number4
DOIs
Publication statusPublished - 1 Apr 2019

Fingerprint

Focal plane arrays
Scanning
Geometrical optics
Beamforming
Time delay
Antennas
Experiments

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

Cite this

@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",
number = "4",

}

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, No. 4, 8621011, 01.04.2019, p. 2305-2319.

Research output: Contribution to journalArticleAcademicpeer-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

AN - SCOPUS:85064271170

VL - 67

SP - 2305

EP - 2319

JO - IEEE Transactions on Antennas and Propagation

JF - IEEE Transactions on Antennas and Propagation

SN - 0018-926X

IS - 4

M1 - 8621011

ER -