Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Conformal array synthesis including mutual coupling
KTH, Tidigare Institutioner                               , Teoretisk elektroteknik.
1999 (engelsk)Inngår i: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 35, nr 8, s. 625-627Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A pattern synthesis technique for a conformal array antenna on a cylinder is presented using the method of alternate projections. Both the sidelobe region and the shape of the main beam are controlled. The method includes the effect of the mutual coupling in the synthesis. It is shown that if mutual coupling is neglected, then poor results are obtained, especially in the shaped beam region.

sted, utgiver, år, opplag, sider
1999. Vol. 35, nr 8, s. 625-627
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-13443ISI: 000080156200013OAI: oai:DiVA.org:kth-13443DiVA, id: diva2:325348
Merknad
QC 20100618Tilgjengelig fra: 2010-06-18 Laget: 2010-06-18 Sist oppdatert: 2017-12-12bibliografisk kontrollert
Inngår i avhandling
1. Analysis and Design of Conformal Array Antennas
Åpne denne publikasjonen i ny fane eller vindu >>Analysis and Design of Conformal Array Antennas
2002 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2002. s. xii, 54
Emneord
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
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-3290 (URN)91-7283-231-2 (ISBN)
Disputas
2002-01-29, 00:00
Merknad
QC 20100616Tilgjengelig fra: 2002-01-21 Laget: 2002-01-21 Sist oppdatert: 2010-06-18bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Søk i DiVA

Av forfatter/redaktør
Persson, Patrik
Av organisasjonen
I samme tidsskrift
Electronics Letters

Søk utenfor DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric

urn-nbn
Totalt: 402 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf