Sonlu uzunlukta çok katlı ve kayıplı silindirden elektromanyetik saçılma
Başlık çevirisi mevcut değil.
- Tez No: 55599
- Danışmanlar: PROF.DR. İNCİ AKKAYA
- Tez Türü: Yüksek Lisans
- Konular: Elektrik ve Elektronik Mühendisliği, Electrical and Electronics Engineering
- Anahtar Kelimeler: Elektromanyetik saçılma, İletişim, Electromagnetic scattering, Communication
- Yıl: 1996
- Dil: Türkçe
- Üniversite: İstanbul Teknik Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
problem has been found to compare. It is believed that this work will fill up some of the gap in this field. It should be reasonable to think foresee that if convenient approximations can be made for the iternal fields reflected at the ends of the cylinder, then the range of the compatibility of the solution introduced herein, will be increased. An approximation can be made for the reelected waves for a single layer cylinder similar to the approach used in [19], but for multilayer cylinders this is more challenging. The calculations are carried out by a program that has been written by us in C++. The reason for preferring C++ to Fortran is the elas ticity of C++. Due to the cumbersome matrix operations done when eva luating the field coefficients in succesive layers, it was possible in C++ to define and derive new mathemaical classes for matrix operations which would have otherwise been harder to deal with in Fortran.
Özet (Çeviri)
are obtained by solving the boundary conditions and the relations are expressed in the folloving manner“A lFA ^m+1,11^mn Bm+l,n _r_ ı Bnm p-[PmnJ c ^m+1,11 ^mn /-'m+l,n_. mn_ where the coefficients on the left side of the above eguation belong to the f ields of layer nri-1 of the cylinder and the öne on the right belong to m. layer. The elements of the recurgion matrix are given in (2.16). Upon determining the fields in each layer of the infinite long cylinder, these field expressions are used to approximate those in¬ side the finite length cylinder satisfying the conditions mentioned above. The dyadic scattering anplitude is derived using eguivalent volime current principle [17], [18] and the approach utilized in [15]. The dyadic scattering anplitude is later put in a form that is more efficient in terms of conputer programning. The result was used to obtain the radar cross section of the finite length multilayer cylinder given by * apq=,4ît E'£(^»0'3 ' P,qe{v,h} v*ıere v and h indicate vertical and horizontal polarizations respectively. A check is done at the end, using the f orward scattering theorem [11], to see if the approximation made f ör the internal fields is valid \ f ör a specific sanple and freguency range. Indeed, it is found that there are limitations to the approximation associated with the dielec- tric properties, geometry and the freguency band involved. The results obtained are also compared with those found in literatüre, for specific cases. ünfortunately, no numerical results dealing with the same ixproblem has been found to compare. It is believed that this work will fill up some of the gap in this field. It should be reasonable to think foresee that if convenient approximations can be made for the iternal fields reflected at the ends of the cylinder, then the range of the compatibility of the solution introduced herein, will be increased. An approximation can be made for the reelected waves for a single layer cylinder similar to the approach used in [19], but for multilayer cylinders this is more challenging. The calculations are carried out by a program that has been written by us in C++. The reason for preferring C++ to Fortran is the elas ticity of C++. Due to the cumbersome matrix operations done when eva luating the field coefficients in succesive layers, it was possible in C++ to define and derive new mathemaical classes for matrix operations which would have otherwise been harder to deal with in Fortran.are obtained by solving the boundary conditions and the relations are expressed in the folloving manner ”A lFA ^m+1,11^mn Bm+l,n _r_ ı Bnm p-[PmnJ c ^m+1,11 ^mn /-'m+l,n_. mn_ where the coefficients on the left side of the above eguation belong to the f ields of layer nri-1 of the cylinder and the öne on the right belong to m. layer. The elements of the recurgion matrix are given in (2.16). Upon determining the fields in each layer of the infinite long cylinder, these field expressions are used to approximate those in¬ side the finite length cylinder satisfying the conditions mentioned above. The dyadic scattering anplitude is derived using eguivalent volime current principle [17], [18] and the approach utilized in [15]. The dyadic scattering anplitude is later put in a form that is more efficient in terms of conputer programning. The result was used to obtain the radar cross section of the finite length multilayer cylinder given by * apq=,4ît E'£(^»0'3 ' P,qe{v,h} v*ıere v and h indicate vertical and horizontal polarizations respectively. A check is done at the end, using the f orward scattering theorem [11], to see if the approximation made f ör the internal fields is valid \ f ör a specific sanple and freguency range. Indeed, it is found that there are limitations to the approximation associated with the dielec- tric properties, geometry and the freguency band involved. The results obtained are also compared with those found in literatüre, for specific cases. ünfortunately, no numerical results dealing with the same ixproblem has been found to compare. It is believed that this work will fill up some of the gap in this field. It should be reasonable to think foresee that if convenient approximations can be made for the iternal fields reflected at the ends of the cylinder, then the range of the compatibility of the solution introduced herein, will be increased. An approximation can be made for the reelected waves for a single layer cylinder similar to the approach used in [19], but for multilayer cylinders this is more challenging. The calculations are carried out by a program that has been written by us in C++. The reason for preferring C++ to Fortran is the elas ticity of C++. Due to the cumbersome matrix operations done when eva luating the field coefficients in succesive layers, it was possible in C++ to define and derive new mathemaical classes for matrix operations which would have otherwise been harder to deal with in Fortran.are obtained by solving the boundary conditions and the relations are expressed in the folloving manner "A lFA ^m+1,11^mn Bm+l,n _r_ ı Bnm p-[PmnJ c ^m+1,11 ^mn /-'m+l,n_. mn_ where the coefficients on the left side of the above eguation belong to the f ields of layer nri-1 of the cylinder and the öne on the right belong to m. layer. The elements of the recurgion matrix are given in (2.16). Upon determining the fields in each layer of the infinite long cylinder, these field expressions are used to approximate those in¬ side the finite length cylinder satisfying the conditions mentioned above. The dyadic scattering anplitude is derived using eguivalent volime current principle [17], [18] and the approach utilized in [15]. The dyadic scattering anplitude is later put in a form that is more efficient in terms of conputer programning. The result was used to obtain the radar cross section of the finite length multilayer cylinder given by * apq=,4ît E'£(^»0'3 ' P,qe{v,h} v*ıere v and h indicate vertical and horizontal polarizations respectively. A check is done at the end, using the f orward scattering theorem [11], to see if the approximation made f ör the internal fields is valid \ f ör a specific sanple and freguency range. Indeed, it is found that there are limitations to the approximation associated with the dielec- tric properties, geometry and the freguency band involved. The results obtained are also compared with those found in literatüre, for specific cases. ünfortunately, no numerical results dealing with the same ixproblem has been found to compare. It is believed that this work will fill up some of the gap in this field. It should be reasonable to think foresee that if convenient approximations can be made for the iternal fields reflected at the ends of the cylinder, then the range of the compatibility of the solution introduced herein, will be increased. An approximation can be made for the reelected waves for a single layer cylinder similar to the approach used in [19], but for multilayer cylinders this is more challenging. The calculations are carried out by a program that has been written by us in C++. The reason for preferring C++ to Fortran is the elas ticity of C++. Due to the cumbersome matrix operations done when eva luating the field coefficients in succesive layers, it was possible in C++ to define and derive new mathemaical classes for matrix operations which would have otherwise been harder to deal with in Fortran.
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