On the resonance and radiation characteristics of multi-layered spherical microstrip antennas

Valagiannopoulos, CA; Tsitsas, NL

dc.contributor.author	Valagiannopoulos, CA	en
dc.contributor.author	Tsitsas, NL	en
dc.date.accessioned	2014-03-01T01:28:57Z
dc.date.available	2014-03-01T01:28:57Z
dc.date.issued	2008	en
dc.identifier.issn	0272-6343	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19038
dc.subject	Galerkin's method	en
dc.subject	Legendre transform	en
dc.subject	Luneburg law	en
dc.subject	Metamaterials	en
dc.subject	Quality factor	en
dc.subject	Resonant frequency	en
dc.subject	Spherical microstrip antenna	en
dc.subject	T-matrix method	en
dc.subject	Zero-index materials	en
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.other	Antenna accessories	en
dc.subject.other	Ceramic capacitors	en
dc.subject.other	Cladding (coating)	en
dc.subject.other	Dielectric waveguides	en
dc.subject.other	Linear systems	en
dc.subject.other	Mathematical transformations	en
dc.subject.other	Microstrip antennas	en
dc.subject.other	Microwave antennas	en
dc.subject.other	Natural frequencies	en
dc.subject.other	Permittivity	en
dc.subject.other	Radiation	en
dc.subject.other	Resonance	en
dc.subject.other	Air-gaps	en
dc.subject.other	Arbitrary numbers	en
dc.subject.other	Basis functions	en
dc.subject.other	cavity models	en
dc.subject.other	Continuous distributions	en
dc.subject.other	control mechanisms	en
dc.subject.other	Dielectric constants	en
dc.subject.other	Galerkin's technique	en
dc.subject.other	High quality factor (Q)	en
dc.subject.other	Index material	en
dc.subject.other	Legendre transforms	en
dc.subject.other	Microstrip (MSL)	en
dc.subject.other	Multi-layered	en
dc.subject.other	numerica l results	en
dc.subject.other	radial functions	en
dc.subject.other	radiation characteristics	en
dc.subject.other	Resonant frequencies	en
dc.subject.other	Singular points	en
dc.subject.other	Spherical(pivot)	en
dc.subject.other	surf ace currents	en
dc.subject.other	T matrix methods	en
dc.subject.other	Matrix algebra	en
dc.title	On the resonance and radiation characteristics of multi-layered spherical microstrip antennas	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/02726340802040096	en
heal.identifier.secondary	http://dx.doi.org/10.1080/02726340802040096	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	The resonance and radiation characteristics of a spherical microstrip with its circular metallic patch located inside a coating, possessing an arbitrary number of layers, are investigated. The developed methodology combines the Legendre transform with a T-matrix method. The appropriate basis functions for the surface current on the patch are chosen according to the cavity model. The complex resonant frequencies are the singular points of a homogeneous linear system, resulting by following a Galerkin's technique. The numerical results of this article propose novel multi-layered spherical microstrip configurations. More precisely, a new type of excitation that concerns an amplifying layer located between core and patch is proposed. The control mechanism of the amplifying capability via the layer's thickness and dielectric constant is reported. Moreover, the behavior of a microstrip with two airgaps that are surrounded by a zero-index material is analyzed. Finally, a coating's continuous distribution, following a ""shifted"" Luneburg law, is treated by a step approximation of the radial function of its dielectric constant, and the achieved high quality factor of such a microstrip is discussed.	en
heal.publisher	TAYLOR & FRANCIS INC	en
heal.journalName	Electromagnetics	en
dc.identifier.doi	10.1080/02726340802040096	en
dc.identifier.isi	ISI:000256968700001	en
dc.identifier.volume	28	en
dc.identifier.issue	4	en
dc.identifier.spage	243	en
dc.identifier.epage	264	en