NDLI: A modified mills cross with elements spaced one wavelength apart

Content Provider	IEEE Xplore Digital Library
Author	MacPhie, R.H. Liang Yuan
Copyright Year	2011
Description	Author affiliation: Electrical and Computer Engineering Department, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L3G1 (MacPhie, R.H.) \|\| 80 Descanso Drive, San Jose, California, USA (Liang Yuan)
Abstract	The Mills Cross uses two orthogonal linear receiving arrays whose voltage patterns are multiplied to form a product pattern. With isotropic elements, the element spacing of each linear array is one half wavelength. This paper introduces a modified Mills Cross with isotropic elements spaced one wavelength apart, thereby reducing the mutual coupling between array elements. Moreover, it requires approximately one quarter fewer elements than the original Mills Cross. It uses an x-axis array with elements spaced λ apart beginning at x = λ/2 on the positive x-axis and beginning at x = 0 for elements on the negative x-axis. Two subarrays replace the original linear array on the y-axis of the Mills Cross. They are located one half wavelength on either side of the y-axis. For x = λ/2 the subarray elements are at y/λ = ±1/2, ±3/2, ±5/2, … and for x = −λ/2 the second subarray elements are at y/λ = 0, ±1, ±2,…. Two product patterns are formed using the x-axis array and the two subarrays in the y-direction. Their sum pattern is the system's output product pattern. It is shown that this pattern can be made equal to the power pattern of a conventional square planar array but with significantly fewer elements and, of course, significantly reduced mutual impedances between the elements.
Starting Page	1
Ending Page	4
File Size	202418
Page Count	4
File Format	PDF
ISBN	9781424451173
e-ISBN	9781424460519
DOI	10.1109/URSIGASS.2011.6050406
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-13
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage measurement Radio astronomy Wavelength measurement Planar arrays Extraterrestrial measurements Educational institutions
Content Type	Text
Resource Type	Article

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