| |
 |
UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:54 |
 |
|
|
|
Conference: Bucharest University Faculty of Physics 2010 Meeting
Section: Solid State Physics and Materials Science
Title:
Dielectric resonator antennas using advanced dielectric materials
Authors:
Mihai Ene Dobre (1), Marian G. Banciu (2),
Liviu Nedelcu (2), Andrei Ioachim (2), Horia V. Alexandru (1)
Affiliation:
(1) University of Bucharest, Faculty of Physics, Magurele, Romania
(2) National Institute of Materials Physics, Magurele, Romania
E-mail
gbanciu@infim.ro; enedobremihai@gmail.com
Keywords:
dielectric resonator antenna, zirconium tin titanate,
Abstract:
Microwave dielectric ceramics with low-loss, high dielectric permittivity and enhanced temperature stability are very attractive for the design of compact microwave devices with improved characteristics.MgO and NiO doped zirconium tin titanate (ZST) ceramics exhibit high dielectric constant, low dielectric loss and low controllable temperature coefficient of the resonance frequency. The dielectric materials were prepared by solid-state reaction.Dielectric resonator antennas (DRA) with ZST materials are investigated for microwave applications. Conventional microstrip antennas printed on high dielectric constant substrates are associated with narrow impedance bandwidth and reduced efficiency due to the excitation of the surface waves. However, these issues are avoided by using dielectric resonator antennas. Compact DRA set-ups were investigated numerically and experimentally in 4-8 GHz range. Microstrip lines were used as feeding elements. In order to avoid any drilling or cutting of the ceramic for DRA manufacturing, the transversal electric TE01d and the hybrid electro-magnetic HEM11d modes were considered for the cylindrical resonators. In both cases, the electric and magnetic field distribution as well as the antenna pattern were investigated.Bandwidth enhancement by using an extra dielectric resonator is proposed. Moreover, the possibility of increasing the antenna gain and shaping the radiation pattern by using several DRAs in an antenna array is also analyzed.
|
|
|
|