Effects of the element separation on the noise performance of receiving antenna arrays


  • Marianna V. Ivashina Netherlands Foundation for Research in Astronomy, Dwingeloo, Netherlands
  • E. E.M. Woestenburg Netherlands Foundation for Research in Astronomy, Dwingeloo, Netherlands
  • E. A. Redkina Sevastopol National Technical University, Ukraine




antenna array, mutual coupling effects, noise coupling effects, noise temperature, radio telescope


Antenna arrays of closely separated elements can be used to achieve a large field of view of a radio telescope with highly efficient multiple beams. However, due to strong mutual coupling effects which exist in such dense arrays, the receiver noise can degrade. To reduce this noise degradation, the optimal noise match condition should be satisfied for all scan angles. This paper presents results of the noise performance analysis of small arrays of dipoles that were obtained for several element separation distances covering both conventional and dense arrays. The receiver noise temperatures are calculated for different noise match situations and the minimum noise temperature conditions are discussed.



HOLTER, H.; CHIO, T.H.; SCHAUBERT, D.H. Experimental results of 144-element dual-polarized endflre tapered-slot phased arrays. IEEE Trans. Antennas Propag., Nov. 2000, v.48, n.11, p.1707-1718, doi: http://dx.doi.org/10.1109/8.900228.

IVASHINA, M. Antenna system modeling and FPA sensitivity verification measurements at WSRT. 3rd Int. FPA Workshop, 12-14 March, 2007, Sydney, http://www.atnf.csiro.au/SKA/fpa_prog2.html.

MAASKANT, R.; WOESTENBURG, E.E.M.; ARTS, M.J. A Generalized Method of Modeling the Sensitivity of Array Antennas at System Level. Proc. of 34th European Microwave Conf., EuMW, 14 Oct. 2004, Amsterdam, The Netherlands. IEEE, 2004, p.1541-1544, http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=1411319&navigation=1.

MAASKANT, R.; YANG, B. A combined electromagnetic and microwave antenna system simulator for radio astronomy. Proc. of First European Conf. on Antennas and Propagation, EuCAP 2006, 6-10 Nov. 2006, Nice, France. IEEE, 2006, p.1-4, doi: http://dx.doi.org/10.1109/EUCAP.2006.4839073.

DOBROWOLSKI, A. Introduction to Computer Methods for Microwave Circuit Analysis and Design. Warsaw University of Technology: Artech House, 1991, ISBN: 0-89006-505-5.

WEEM, J.P.; POPOVIC, Z. A Method for Determining Noise Coupling in a Phased Array Antenna. IEEE MTT-S Int. Microwave Symp. Dig., 20-24 May 2001, Phoenix, AZ, USA. IEEE, 2001, v.1, p.271-274, doi: http://dx.doi.org/10.1109/MWSYM.2001.966886.

MAASKANT, R.; WOESTENBURG, E.E.M. Applying the Active Antenna Impedance to Achieve Noise Match in Receiving Array Antennas. Accepted for publication at APS 2007, Honolulu, Hawaii, 2007.

WOESTENBURG E.E.M.; IVASHINA, M.V. Use of the Active Antenna Impedance in Noise Analysis of Receiving Focal Plane Arrays. Submitted to EuCAP2007, November 2007, Edinburgh.