Open AccessTall microstrip transmission lines for dielectric resonator antenna applications
Author(s) -
Rashidian Atabak,
Shafai Lotfollah,
Klymyshyn David M.
Publication year - 2014
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2012.0608
Subject(s) - materials science , microstrip , dielectric resonator antenna , wideband , microstrip antenna , impedance matching , permittivity , bandwidth (computing) , optoelectronics , transmission line , optics , electrical impedance , acoustics , antenna (radio) , dielectric , electrical engineering , physics , telecommunications , computer science , engineering
Dielectric resonator antennas (DRAs) excited by tall microstrip transmission lines (TMLs) are investigated. Two different TML–DRA structures are proposed and the impact of TML parameters on the antenna performance is studied when low‐loss and lossy substrates are used. To validate the effectiveness of this approach, a set of prototype antennas was fabricated, measured and compared with simulation results. A good agreement is obtained. It is found that by adjusting TML parameters, excellent impedance matching and coupling to low‐permittivity DRAs are achieved even on high‐permittivity substrates. The impedance bandwidth of a single‐mode simple‐shape rectangular DRA with ɛ rd = 9 can be as high as 25%. The radiation efficiency of the antenna on extremely lossy substrates is significantly improved and based on the measured results over 80% efficiency with a gain ranging from 4.2 to 5.5 dBi along the impedance bandwidth can be expected. Since TML is a low‐loss transmission line, the DRA is a low‐loss radiator and low‐permittivity DRAs can be well matched by TML, the TML–DRA forms an excellent wideband antenna system with high radiation efficiency.