Novel metamaterial blueprints and elements for electromagnetic applications
Başlık çevirisi mevcut değil.
- Tez No: 403041
- Danışmanlar: PROF. FERNANDO L. TEIXEIRA
- Tez Türü: Doktora
- Konular: Bilgisayar Mühendisliği Bilimleri-Bilgisayar ve Kontrol, Elektrik ve Elektronik Mühendisliği, Computer Engineering and Computer Science and Control, Electrical and Electronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2013
- Dil: İngilizce
- Üniversite: The Ohio State University
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 145
Özet
Özet yok.
Özet (Çeviri)
In the first part of this dissertation, we explore the metric invariance of Maxwell's equations to design metamaterial blueprints for three novel electromagnetic devices. The metric invariance of Maxwell's equations here means that the effects of an (hypothetical) distortion of the background spatial domain on the electromagnetic fields can be mimicked by properly chosen material constitutive tensors. The exploitation of such feature of Maxwell's to derive metamaterial devices has been denoted as 'transformation optics' (TO). The first device proposed here consists of metamaterial blueprints of waveguide claddings for (waveguide) miniaturization. These claddings provide a precise control of mode distribution and frequency cut-off. The proposed claddings are distinct from conventional dielectric loadings as the former do not support hybrid modes and are impedance-matched to free-space. We next derive a class of metamaterial blueprints designed for low-profile antenna applications, whereby a simple spatial transformation is used to yield uniaxial metamaterial substrate with electrical height higher than its physical height and surface waves are not supported, which is an advantage for patch antenna applications. We consider the radiation from horizontal wire and patch antennas in the presence of such substrates. Fundamental characteristics such as return loss and radiation pattern of the antennas are investigated in detail. Finally, transformation optics is also applied to design cylindrical impedance-matched absorbers. In this case, we employ a complex-valued transformation optics approach (in the Fourier domain) as opposed to the conventional real-valued approach. A connection of such structures with perfectly matched layers and recently proposed optical pseudo black-hole devices is made. In the second part of this dissertation, we move from the derivation of metamaterial blueprints to the application of pre-defined unit-cell metamaterial structures for miniaturization purposes. We first employ electric-field-coupled (ELC) resonators and complementary electric-field-coupled (CELC) resonators to design a new class of electrically small antennas. Since electric-field coupled resonators were recently proposed in the literature to obtain negative permittivity response, we next propose ELC resonators as a new type of waveguide loadings to provide mode control and waveguide miniaturization.
Benzer Tezler
- Transmission and propagation properties of novel metamaterials
Yeni metamalzemelerin geçirgenlik ve yayılma özellikleri
LEVENT ŞAHİN
Yüksek Lisans
İngilizce
2009
Elektrik ve Elektronik MühendisliğiOrta Doğu Teknik ÜniversitesiElektrik ve Elektronik Mühendisliği Bölümü
PROF. DR. GÖNÜL TURHAN SAYAN
- Güneş pili uygulamaları için çoklu ve geniş bant metamalzeme soğurucu tasarımı
Multiband and wideband metamaterial absorber designs for solar cell applications
JAAFAR ALSMAEL
Yüksek Lisans
Türkçe
2019
Elektrik ve Elektronik MühendisliğiErciyes ÜniversitesiElektrik-Elektronik Mühendisliği Ana Bilim Dalı
DOÇ. DR. MUSTAFA TÜRKMEN
- Analysis, applications, and a novel design of double negative metamaterials
Çift negatif metamalzemelerin analiz, uygulama ve yeni tasarımı
CUMALİ SABAH
Doktora
İngilizce
2008
Elektrik ve Elektronik MühendisliğiGaziantep ÜniversitesiElektrik ve Elektronik Mühendisliği Ana Bilim Dalı
PROF. DR. SAVAŞ UÇKUN
- Yönden bağımsız metamalzeme soğurucu
Omnidirectional metamaterial absorber
KERİM GÖKHAN YÜKSEL
Yüksek Lisans
Türkçe
2019
Fizik ve Fizik MühendisliğiAnkara ÜniversitesiFizik Mühendisliği Ana Bilim Dalı
PROF. DR. BARIŞ AKAOĞLU
- Novel approaches to control the propagation of electromagnetic waves: Metamaterials and photonic crystals
Elektromanyetik dalgaların yayılmasının kontrolünde yeni yöntemler: Metamalzemeler ve fotonik kristaller
İRFAN BULU
Doktora
İngilizce
2007
Fizik ve Fizik Mühendisliğiİhsan Doğramacı Bilkent ÜniversitesiFizik Ana Bilim Dalı
PROF. EKMEL ÖZBAY