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Ammar Nadal Shareef

Ammar Nadal Shareef
Al Muthanna University : College of Basic Education · Science Department

Ph.D

About

12
Publications
6,304
Reads
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20
Citations
Additional affiliations
September 2009 - present
Al Muthanna University
Position
  • Research Director

Publications

Publications (12)
Article
Full-text available
Metamaterials exhibiting negative index of refraction has attracted a great amount of attention in recent years. These materials are artificial structures that exhibit characteristics not found in nature. Microstrip antennas covered by metamaterial are one of the interesting areas of study. In this paper fractal shape antenna is proposed and covere...
Article
Full-text available
Gain enhancement has attracted a great amount of attention in literatures. There were many ways, which were published to improve antenna gain. One of these ways is using Metamaterials. Materials that have negative refractive index are used to achieve this goal. These materials are artificial structures that exhibit characteristics not found in natu...
Article
Full-text available
Negative index of refraction has attracted a great attention in literatures. These materials are artificial structures named metamaterials has characteristics not found in nature. Microstrip antennas covered by metamaterial are very interesting areas of study. In this paper fractal Peano shape antenna is proposed and covered by two layers of modifi...
Article
Full-text available
Advanced materials are artificial structure materials that exhibit properties not found in nature. Material that has a negative refractive index (left-handed materials) is found to get a lot of interest in the literatures. Controlling the geometry of classical material may lead to have a negative refractive index in a certain frequency range. In th...
Article
Full-text available
Fractal shapes has unusual properties. These unique features will affect antenna parameters when designed in fractal shapes. Two fractal shapes combined together to generate new fractal shape dipole antenna. Seirpinski and modified Koch fractal shapes allow this antenna to operate at too far apart frequencies lies in X and K band. Fractal dimension...
Article
Full-text available
Abstract: Square patch antenna fed by strip line with meta-phi cell printed on the ground plane is proposed here. Meta-cell technique is very powerful way to shift operating band to lower frequencies. According to the propagation characteristics of radio signals, rapid attenuation of signals occurs in millimeter wave spectrum when it penetrates bui...
Article
Full-text available
Fractal shapes has unusual properties. These unique features will affect antenna parameters when designed in fractal shapes. Two fractal shapes combined together to generate new fractal shape dipole antenna. Seirpinski and modified Koch fractal shapes allow this antenna to operate at too far apart frequencies lies in X and K band. Fractal dimension...
Article
Full-text available
Bandwidth of the operating frequency of an antenna is an important parameter in antenna design. It is strongly related to the performance of data rate. Hence to get more data rates for mobile applications, much higher bandwidths are needed. Frequency bands lies above 6 GHz, characterized by more continuous frequency range than bands below 6 GHz. Th...
Article
Full-text available
Bandwidth of the operating frequency of an antenna is an important parameter in antenna design. It is strongly related to the performance of data rate. Hence to get more data rates for mobile applications, much higher bandwidths are needed. Frequency bands lies above 6 GHz, characterized by more continuous frequency range than bands below 6 GHz. Th...
Article
Full-text available
Size reduction of square patch antenna is proposed using meta-fractal technique. This technique implies adding fractal shape (Peano shape here) to the classical square antenna to reduce its size and then a complementary split ring resonator (CSRR) is slotted on the patch as a defect. The defect enforces the antenna to behave as meta-material in a s...
Thesis
Full-text available
Abstract Metamaterials or left-handed materials are man-made structures. They have properties like negative refractive index that is not found in natural materials. Metamaterials that is designed by placing electromagnetic resonators like split ring resonators (SRRs) in a periodic array is among the most popular designs. Split ring resonators when...

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