Original Research Paper
Design, Simulation and implementation of active dual-band dipole antenna using a series stub

M. Zahiry; S.M. Hashemi; J. Ghalibafan

Volume 5, Issue 1 , January 2017, Pages 1-6


  In this paper, a new method for designing an active dual-band dipole antenna is proposed. The operating frequencies of the proposed antenna are 150 and 450 MHz that are usually used in military applications. Using a series stub is the main idea in the proposed dual-band antenna, where it makes an independent ...  Read More

Original Research Paper
A Small Printed Quadrifilar Helical Antenna for BGAN/GPS Applications

R. Kazemi

Volume 5, Issue 1 , January 2017, Pages 7-11


  This paper presents an element of a 2×2-element array antenna for Inmarsat BGAN/GPS applications. The element is an axial mode printed quadrifilar helical antenna that has been integrated with a compact feed network to provide sequential phase rotation for circular polarization (CP) radiation. ...  Read More

Original Research Paper
Design of an S-band Ultra-low-noise Amplifier with Frequency Band Switching Capability

M. Shakibmehr; M. Lotfizad

Volume 5, Issue 1 , January 2017, Pages 13-18


  In this paper, an ultra-low-noise amplifier with frequency band switching capability is designed, simulated and fabricated. The two frequency ranges of this amplifier consist of the 2.4 to 2.5 GHz and 3.1 GHz to 3.15 GHz frequency bands. The designed amplifier has a noise figure of less than 1dB, a minimum ...  Read More

Original Research Paper
Optical pulse compression based on nonlinear silicon waveguides and chirped Bragg gratings

A. Ahmadipour; H. Tezkhan; H. Soofi

Volume 5, Issue 1 , January 2017, Pages 19-23


  Due to the growing demand for higher bandwidth, employing optical devices instead of electronic devices in data transmission systems has attracted much attention in recent years. Optical switches, modulators and wavelength converters are a few examples of the required optical devices. CMOS compatible ...  Read More

Original Research Paper
Numerical Investigation of the Non-Uniformity of the Electric Field Distribution by Injection of Net Electron Charge in TE CO2 Laser

N. Morshedian; M. Aram; A. Mehramiz; N. Jahanian

Volume 5, Issue 1 , January 2017, Pages 25-29


  In this report, the distribution and deviation of electric field in the active medium of the TE CO2 laser has been investigated due to the injection of net electron charge beam as a plasma generator. Some parameters of system have been considered, such as density and mean-free-path of injected charge ...  Read More

Original Research Paper
Ferrite material Characterization Using S-Parameters Data

M. Maleki; S.H. Mohseni Armaki; E. Hamidi

Volume 5, Issue 1 , January 2017, Pages 31-36


  ince many applications rely on the knowledge of the electromagnetic material properties of ferrites, such as ferrite phase shifters, this paper presents an algorithm for characterizing ferrite materials in a single frequency using a rectangular waveguide system. In this method, the extraction of ferrite ...  Read More

Original Research Paper
Monopole Antenna Radar Cross Section Reduction with Plasma Helix

M. KHadir; K. Forooraghi; Z. Atlasbaf

Volume 5, Issue 1 , January 2017, Pages 37-41


  In this paper, a new method for radar cross section reduction of a monopole antenna is proposed. In this method, a plasma helix like fluorescent bulbs is placed around the antenna element. The selected plasma parameter for this medium acts as an absorber without disturbing the antenna performance. The ...  Read More

Original Research Paper
Electromagnetic Absorber Realization Using Huygens Metasurfaces

M. Samadpour Hendevari; M. Bemani; S. Nikmehr

Volume 5, Issue 1 , January 2017, Pages 43-46


  In this paper, the possible realization of the electromagnetic (EM) absorber as a thin metasurface is considered. The metasurface is based on establishing a passive surface of electric and magnetic currents using the Huygen’s principle. So, the absorber is named Huygens Absorber (HA). The metasurface ...  Read More

Original Research Paper
Design and Fabrication of Plasma Array Antenna with Beam Forming

F.S. Mohseni Armaki; S.A. Mohseni Armaki

Volume 5, Issue 1 , January 2017, Pages 47-51


  In this paper, the design and implementation of plasma antenna array with beam forming is discussed. The structure consists of a circular array of plasma tube enclosed in a unipolar UHF band monopole antenna. Beam forming is possible by stimulated plasma tubes. The combination of the above antenna with ...  Read More

Original Research Paper
Flexible Radar Absorbing Nanocomposites Based on Co-ferrite/Nano Carbon/polymeric epoxy resin

N. Rezazadeh; A. Kianvash

Volume 5, Issue 1 , January 2017, Pages 53-57


  In this research work cobalt-ferrite (CoFe2O4) nanoparticles were synthesized by a simple, general sol-gel auto-combustion method. For this study, electromagnetic (EM) wave absorbing coatings with different weight fractions of nano-carbon and CoFe2O4 (which, arises from both dielectric and magnetic contributions) ...  Read More

Original Research Paper
Microstrip Antenna Gain Enhancement using Near Zero Refractive Index Metamaterials

S. Mohanna; A. Tamandani; S. Soltani

Volume 5, Issue 1 , January 2017, Pages 59-63


  Some useful features of microstrip patch antennas are low profile, low weight and easy fabrication. However this type of antenna suffers from having a low gain, caused by propagation surface waves. In this paper, a new near zero refractive index metamaterial (MTM) unit cell is designed and fabricated ...  Read More

Original Research Paper
Axial Corrugated Horn Antenna with Elliptical Tapering Function

A. Amn-e-Elahi; P. Rezaei

Volume 5, Issue 1 , January 2017, Pages 65-69


  An axially corrugated horn antenna with an elliptically shaped taper is proposed for satellite communication applications. This structure is a good candidate for the feed of reflectors and also for improving the electrical properties of reflector antennas. A tapering method is used to justify the horizontal ...  Read More

Original Research Paper
Simulation of IR Detector at Communication Window of 1550nm based on Graphene

A. Sotoudeh; A. Rajabi; M. Amirmazlaghani

Volume 5, Issue 1 , January 2017, Pages 71-77

  In this paper, photodetection properties of a Graphene-based device at the third telecommunication window have been reported. The structure of the device is a Graphene-silicon Schottky junction which has been simulated in the form of an infrared photodetector. Graphene has specific electrical and optical ...  Read More