Showing 2 results for F. Hojjat Kashani
F. Hojjat Kashani, A. A. Lotfi Neyestanak, K. Barkeshli,
Volume 1, Issue 2 (April 2005)
Abstract
A modified circular patch antenna design has been proposed in this paper, the
bandwidth of this antenna is optimized using the genetic algorithm (GA) based on fuzzy
decision-making. This design is simulated with HP HFSS Program that based on finite element
method. This method is employed for analysis at the frequency band of 1.4 GHz- 2.6 GHz. It
gives good impedance bandwidth of the order of 15.5% at the frequency band of 1.67GHz-
1.95GHz and 10.6% at 2.23GHz- 2.48GHz. It means that impedance bandwidth increases above
4.9% than the impedance bandwidth of ordinary circular patch antennas and band width rise
from 1.78GHz- 1.98GHz (10.6%) to 1.67GHz- 1.95GHz (15.5%) and 2.23GHz- 2.48GHz
(10.6%). The antenna fabricated with two slots on circular patch antenna. The measured results
of the optimized antenna validate a high compatibility between the simulation and the
measurements.
F. Hojjat Kashani, Salimnejad,
Volume 2, Issue 2 (April 2006)
Abstract
The development of numerical techniques now permits us to analyze complex
structures such as dielectric resonator filters and planar passive elements for coplanar
monolithic microwave integrated circuits. In this paper, we describe a novel method for
designing dielectric resonator filters. Then a Chebychev band pass filter is designed by
coaxially placing high-Q TM01Q dielectric resonators in a cutoff circular waveguide. In the
present work, discussions are made regarding high-Q resonators and inter-resonator
coupling.
