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Investigation of the mutual coupling between apertures on doubly curved convex surfaces: Theory and measurements
KTH, Superseded Departments, Electromagnetic Theory.
2003 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 0096-1973, Vol. 51, no 4, 682-692 p.Article in journal (Refereed) Published
Abstract [en]

A hybrid method of high-frequency approximation (UTD) and method of moments is used to calculate. the mutual coupling between circular apertures on a doubly curved surface. This requires that the geodesics on doubly curved surfaces be found. To represent the aperture fields, a single waveguide mode approximation is used. In order to verify the theoretical results, a general paraboloid of revolution with circular waveguide-fed apertures was built at Ericsson Microwave Systems AB, Molndal, Sweden. This has given a possibility to verify the theoretical model for a general doubly curved surface against measurements. To the authors' knowledge, no such verification is available in the literature. It was found that measured and theoretical results in terms of mutual coupling agree very well for copolar coupling. As expected, the mutual coupling results are very dependent on the polarization. In fact, the definition of polarization directions and the heed for polarization control are important issues for doubly curved conformal array antennas.

Place, publisher, year, edition, pages
2003. Vol. 51, no 4, 682-692 p.
Keyword [en]
conformal antenna, double curved surface, geodesics, method of moments (MoM), mutual coupling, uniform theory of diffraction (UTD), RAY ANALYSIS, REVOLUTION, ANTENNAS
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-13444DOI: 10.1109/TAP.2003.811101ISI: 000183931200001OAI: oai:DiVA.org:kth-13444DiVA: diva2:325347
Note
QC 20100618Available from: 2010-06-18 Created: 2010-06-18 Last updated: 2010-06-18Bibliographically approved
In thesis
1. Analysis and Design of Conformal Array Antennas
Open this publication in new window or tab >>Analysis and Design of Conformal Array Antennas
2002 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Today there is a great need for communication between people and even between things, using systems onboard e.g. aircraft, cars, ships and satellites. As a consequence, these communications needs require antennas mounted on or integrated in the surfaces of different vehicles or platforms, i.e. conformal antennas. In order to ensure proper operation of the communication systems it is important to be able to determine the characteristics of these antennas. This thesis is about the analysis and design of conformal antennas using high frequency asymptotic methods. Commonly used eigenfunction solutions or numerical methods such as FDTD, FEM or MoM are difficult to use for arbitrarily shaped electrically large surfaces. However, the high frequency approximation approach together with an accurate ray tracing procedure offers a convenient solution for these surfaces. The geodesics (ray paths) on the surfaces are key parameters in the analysis and they are discussed in detail. In the first part of the thesis singly and doubly curved perfectly electrical conducting (PEC) surfaces are studied, with respect to the mutual coupling among aperture type elements. A synthesis problem is also considered where the effect of the mutual coupling is taken into account. As expected, the mutual coupling must be included in the synthesis procedure to be able to realize the prescribed pattern, especially in the shaped main lobe. Furthermore, the polarization of the antenna elements is very important when considering antennas on generally shaped surfaces. For such antennas the polarization must most likely be controlled in some way for a proper function. For verification of the results two experimental antennas were built at Ericsson Microwave Systems AB, Mölndal, Sweden. The first antenna is a circular cylinder with an array of rectangular waveguide fed apertures and the second antenna is a doubly curved surface (paraboloid) with circular waveguide fed apertures. It is found that it is possible to obtain very accurate results with the asymptotic method when it is combined with the Method of Moments, i.e. a hybrid method is used. The agreement compared to measurements is good at levels as low as –80 dB in many cases. The second part of the thesis is about the development of a high frequency approximation for surface field calculations on a dielectric covered PEC circular cylinder. When using conformal antennas in practice they have to be covered with a radome for protection and with the method developed here this cover can be included in the analysis. The method is a combination of two different solutions, one valid in the non-paraxial region of the cylinder and the other is valid in the paraxial region. The method is verified against measurements and reference results obtained from a spectral domain moment method code.

Place, publisher, year, edition, pages
Stockholm: KTH, 2002. xii, 54 p.
Keyword
Conformal antennas, conformal arrays, UTD, high frequency method, MoM, hybrid method, mutual coupling, singly curved surface, doubly curved surface, geodesics, dielectric covered circular cylinder, non-paraxial region. paraxial region, waveguide fed
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-3290 (URN)91-7283-231-2 (ISBN)
Public defence
2002-01-29, 00:00
Note
QC 20100616Available from: 2002-01-21 Created: 2002-01-21 Last updated: 2010-06-18Bibliographically approved

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