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A study of edge effects in triangular grid tapered-slot arrays using coupling coefficients
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0001-9241-8030
2010 (English)In: Radio Science, ISSN 0048-6604, E-ISSN 1944-799X, Vol. 45, RS2005- p.Article in journal (Refereed) Published
Abstract [en]

Edge effects for tapered-slot elements in triangular grid array antennas are studied by using finite difference time domain codes. The S parameters for finite-by-infinite arrays are computed and evaluated for two different edge models and, to evaluate the edge effects, the results are compared with the S parameters for the infinite array. As expected, the largest difference between the results occurs for the elements closest to the edges, because of the missing coupling from nearby elements and the perturbed element currents due to the edge geometry. By using the proposed method it is possible to distinguish between these two edge effects. A method to combine the finite-by-infinite array results and the infinite array results is presented and used to characterize the perturbation caused by the truncation of the infinite array.

Place, publisher, year, edition, pages
2010. Vol. 45, RS2005- p.
Keyword [en]
ANTENNA-ARRAYS, PHASED-ARRAYS, FINITE, DIRECTIONS
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-10224DOI: 10.1029/2009RS004174ISI: 000276831400001Scopus ID: 2-s2.0-77954321672OAI: oai:DiVA.org:kth-10224DiVA: diva2:211538
Note
QC 20100712 Uppdaterad från submitted till published (20110114).Available from: 2009-04-16 Created: 2009-04-16 Last updated: 2011-01-14Bibliographically approved
In thesis
1. Wide-angle scanning wide-band phased array antennas
Open this publication in new window or tab >>Wide-angle scanning wide-band phased array antennas
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis considers problems related to the design and the analysis of wide-angle scanning phased arrays. The goals of the thesis are the design and analysis of antenna elements suitable for wide-angle scanning array antennas, and the study of scan blindness effects and edge effects for this type of antennas. Wide-angle scanning arrays are useful in radar applications, and the designs considered in the thesis are intended for an airborne radar antenna.After a study of the wide-angle scanning limits of three candidate elements, the tapered-slot was chosen for the proposed application.A tapered-slot antenna element was designed by using the infinitive array approach and the resulting element is capable of scanning out to 60° from broadside in all scan planes for a bandwidth of 2.5:1 and an active reflection coefficient less than -10 dB. This design was implemented on an experimental antenna consisting of 256 elements.The predicted performance of the antenna was then verified by measuring the coupling coefficients and the embedded element patterns, and the measurements agreed well with the numerical predictions.Since the radar antenna is intended for applications where stealth is important, an absorbing layer is positioned on top of the ground plane to reduce the radar cross section for the antenna's cross-polarization.This absorbing layer attenuates guided waves that otherwise lead to scan blindness, but does not adversely affect the antenna performance for the desired scan directions and frequencies.The highest frequency limit of the tapered-slot element is set by scan blindnesses. One of these scan blindnesses is found to be unique to tapered-slot elements positioned in triangular grids. This scan blindness is studied in detail and a scan blindness condition is presented and evaluated.The evaluation of the experimental antenna shows that edge effects reduce the H-plane performance of the central elements.These edge effects are further studied and characterized, by comparing the scattering parameters for finite-by-infinite arrays and infinite arrays.In this way it is possible to divide the edge effects into two categories: those caused by finite excitation, and those caused by perturbed currents due to the geometry of the edge. A finite difference time domain code with time shift boundaries is used to compute the active reflection coefficients needed to compute the scattering parameters, but this code cannot directly compute the active reflection coefficient for all the required phase shifts.Hence, an additional method is presented that makes it possible to compute arbitrary phase shifts between the elements using any numerical code with limited scan directions.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. viii, 62 p.
Series
Trita-EE, ISSN 1653-5146 ; 2009:017
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-10225 (URN)978-91-7415-291-3 (ISBN)
Public defence
2009-05-08, F3, Lindstedtsvägen 26, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
QC 20100712Available from: 2009-05-07 Created: 2009-04-16 Last updated: 2010-07-12Bibliographically approved

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Norgren, Martin

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