Abstract
The very demanding requirements of the SKA-low instrument call for a challenging antenna design capable of delivering excellent performance in radiation patterns, impedance matching, polarization purity, cost, longevity, etc. This paper is devoted to the development (design and test of the first prototypes) of an active ultra-wideband antenna element for the low-frequency instrument of the SKA radio telescope. The antenna element and differential low noise amplifier described here were originally designed to cover the former SKA-low band (70–450 MHz) but it is now aimed to cover the re-defined SKA-low band (50–350 MHz) and furthermore the antenna is capable of performing up to 650 MHz with the current design. The design is focused on maximum sensitivity in a wide field of view (+/− 45° from zenith) and low cross-polarization ratios. Furthermore, the size and cost of the element has to be kept to a minimum as millions of these antennas will need to be deployed for the full SKA in very compact configurations. The primary focus of this paper is therefore to discuss various design implications for the SKA-low telescope.
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Dewdney, P.E., Hall, P.J., Schilizzi, R.T., Lazio, T.J.L.W.: The square kilometre array. Proc. IEEE 97, 1482–1496 (2009)
Mellema, G., et al.: Reionization and the cosmic dawn with the square kilometre array. Exp. Astron. 36, 235–318 (2013)
Dewdney, P.: SKA phase 1 system (level 1) requirements specification. SKA-OFF.SE.ARC-SKO-SRS-001-A, rev. 1, 4 November 2013.
Razavi-Ghods, N., de Lera, E., Makadema, A., Alexander, P., Brown, A.: Analysis of sky contributions to system temperature for low frequency SKA aperture array geometries. Exp. Astron. 33, 141–155 (2012). doi:10.1007/s10686-011-9278-6
Braun, R., Van Capellen, W.: Aperture arrays for the SKA, dense or sparse?. SKA MEMO 87, available online at www.skatelescope.org.
El-makadema, A., Rashid, L., Brown, A. K.: Geometry design optimization of large-scale broadband antenna array systems. IEEE Trans. Antennas Propag. 62(4), (2014).
Gonzalez-Ovejero, D., de Lera Acedo E., Razavi-Ghods, N., Craeye, C., Garcia Munoz, L.E.: Non-periodic arrays for radio-astronomy applications. IEEE Intl. Symp. Antennas Propag. 1762–1765, (2011).
Clavier, T., Razavi-Ghods, N., Glineur, F., González-Ovejero, D., de Lera Acedo, E., Craeye, C., Alexander, P.: A global–local synthesis approach for large non-regular arrays.IEEE Trans.Antennas Propag. doi: 10.1109/TAP.2013.2284816.
Ivashina, M.V., Maaskant, R., Woestenburg, B.: Equivalent system representation to model the beam sensitivity of receiving antenna arrays. IEEE Antennas Wirel. Propag. Lett. 7, 733–737 (2008)
de Lera Acedo, E., Razavi-Ghods, N., García, E., Duffett-Smith, P., Alexander, P.: Ultra wide band antennas in aperture arrays for low frequency radio astronomy. IEEE Trans. Antennas Propag. 59(6), 1808–1816 (2011)
Carozzi, T.D., Woan, G.: A fundamental figure of merit for radio polarimeters. arXiv:0908.2330 (2009).
de Lera Acedo, E., Razavi-Ghods, N., González-Ovejero, D., Sarkis, R., Craeye, C.: Compact representation of the effects of mutual coupling in non-regular arrays devoted to the SKA telescope. International Conference on Electromagnetics in Advanced Applications (ICEAA 2011), Torino, Italy, September 2011.
de Lera Acedo, E., Craeye, C., Razavi-Ghods, N., González-Ovejero, D.: Low order beam models for the calibration of large aperture arrays for radio astronomy; the case of the SKA AA-low instrument. Electromagnetics in Advanced Applications (ICEAA), 2013 International Conference on, September 2013, Turin.
de Lera Acedo, E.: SKALA: A log-periodic antenna for the SKA. International Conference on Electromagnetics in Advanced Applications (ICEAA 2012), Cape Town, SA, September 2012.
Gonzalez-Ovejero, D., Craeye, C.: Interpolatory macro basis functions analysis of non-periodic arrays. IEEE Trans. Antennas Propag. doi: 10.1109/TAP.2011.2158947.
Cole, M., de Lera Acedo, E., Reader, H.C.: EM modelling of lightning effects on SKA-low array antennas. ICEAA 2013, September 2013, Turin.
Padhi, S.: Antenna Standardization report. Internal report, ICRAR, Perth. Ver: 2.0, August 2012.
Wijnholds, S.J., Ivashina, M.V., Maaskant, R., Warnick, K.F.: Polarimetry with phased array antennas: sensitivity and polarimetric performance using unpolarized sources for calibration. IEEE Trans. Antennas Propag. 60(10), 4688–4698 (2012)
Wijnholds, S.J., et al.: Low frequency aperture array substantiation of level 1 calibration requirements. internal SKA report, January 2013. Ref: SKA-‐TEL.LFAA.SE.CAL-‐AADC-‐TN-‐001.
Fiorelli, B., Arts, M., de Lera Acedo, E., Virone, G., bij de Vaate, J.G.: Polarization performances and antenna misalignment errors for aperture arrays: the SKA-low AAVS0.5 case. Electromagnetics in Advanced Applications (ICEAA), 2013 International Conference on, September 2013, Turin.
Sutinjo, A.T., Hall, P.J.: Element rotation tolerance in a low-frequency aperture array polarimeter. 2013 International Conference on Electromagnetics in Advanced Applications (ICEAA). pp. 58,61 (2013).
Hannan, P.W.: The element-gain paradox for a phased array antenna. IEEE Trans. Antennas Propag. AP-12(4), 423–433 (1964)
de Lera Acedo, E., Razavi-Ghods, N., et al.: SKA AA-low front-end developments (at Cambridge University). in Proc. of IEEE European Conference on Antennas and Propagation, EuCAP, Prague, March 2012.
de Lera Acedo, E., Reader, H.C., Razavi-Ghods, N.: Measurements and characterization of differentially-fed antennas for radio astronomy; the case of SKALA. ICEAA 2013, September 2013, Turin, pp. 968–971.
Arts, M., Maaskant, R., de Lera Acedo, E., bij de Vaate, J.G.: Broadband differentially-fed tapered slot antenna array for radio astronomy applications. in 3rd European Conference on Antennas and Propagation 2009, EuCAP 2009, (Berlin), pp. 566–570, 23–27 March 2009.
Virone, G., Lingua, A., Piras, M., Cina, A., Perini, F., Monari, J., Paonessa, F., Peverini, O., Addamo, G., Tascone, R.: Antenna pattern verification system based on a micro unmanned aerial vehicle (UAV). IEEE Antennas Wirel. Propag. Lett. 13, 169–172 (2014)
Raucy, C., de Lera Acedo, E., Craeye, C., Razavi-Ghods, N.: Characterization of SKA-AAlow antenna elements in the array environment. International Conference on Electromagnetics in Advanced Applications (ICEAA 2012), Cape Town, SA, September 2012.
Raucy, C., de Lera Acedo, E., Razavi-Ghods, N., González-Ovejero, D., Craeye, C.: Low-cost near field pattern measurement technique for aperture array characterization. in Proc. of IEEE European Conference on Antennas and Propagation, EuCAP, Goteborg, April 2013.
Fiorelli, B., de Lera Acedo, E.: On the simulation and validation of the intrinsic cross-polarization ratio for antenna arrays devoted to low frequency radio astronomy. EuCAP 2014, The Hague, Netherlands, April 2014.
Hall, P.J., Sutinjo, A.T., de Lera Acedo, E., Wayth, R.B., Razavi-Ghods, N., Colegate, T.M., Faulkner, A.J., Juswardy, B., Fiorelli, B., Booler, T., Bij de Vaate, J.G., Waterson, M., Tingay, S.J.: First results from AAVS 0.5: an on-site SKA-low verification system. ICEAA 2013, September 2013, Turin.
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The authors would like to acknowledge their SKA colleagues for numerous discussions and constructive input about the topic.
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de Lera Acedo, E., Razavi-Ghods, N., Troop, N. et al. SKALA, a log-periodic array antenna for the SKA-low instrument: design, simulations, tests and system considerations. Exp Astron 39, 567–594 (2015). https://doi.org/10.1007/s10686-015-9439-0
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DOI: https://doi.org/10.1007/s10686-015-9439-0