Safa Nassr Nafea
@coie-nahrain.edu.iq
Systems Engineering Department / College of Information Engineering
Al-Nahrain University
RESEARCH INTERESTS
Communication
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Safa N. Nafea and Nasser N. Khamiss
Polish Academy of Sciences Chancellery
The patch antenna usually used for many wireless applications, and fifth generation (5G) is the most attracting application in the field of millimeter wave communications recently. The researchers worked on solving problems those considered milestones against using patch antenna for 5G applications such as being an antenna with moderate gain and narrow operating bandwidth with high side lobe levels. In this article a microstrip patch antenna had been presented to operate over the n258 – Band for 5G communications at 26 GHz with an operating bandwidth around than 7 GHz. The proposed antenna was printed on Rogers RT/Duroid 5880 substrate. A high gain of 8.10 dB had been achieved with high Front – to – Back ratio of 24.47 dB and very low side lobe levels far field radiation pattern around -17 dB. The proposed antenna covered the operating bandwidth n258 for fifth generation applications in range of (24.25 – 27.50) GHz. The Computer simulation Technology (CST) had been used as a simulation environment for this design.
Safa Nassr Nafea and Nasser N. Khamiss
Institute of Advanced Engineering and Science
<span>The fifth generation (5G) of telecommunications is an attractive application for many researchers during the last years. The 5G requires high date rate with low latency communication medium and patch antenna was used recently for this application. In this article a patch antenna for 5G at 38 GHz was proposed. This article worked on enhancing the gain of patch antenna at Ka-Band and reducing side lobes level (SLL) in radiation pattern. The gain of the patch antenna was improved using a reflector layer located under antenna’s ground with free space air gap separating between two layers. Moreover, the SLL were reduced to satisfy low latency condition for 5G communications. The proposed antenna shows high gain around 8.10 dB with high front-to-back (F/B) ratio of 16.24 dB and wide operating bandwidth around 1.4 GHz for high data rate requirements as well as having reduced overall size antenna. The article based on analytical calculations for patch dimensions and optimization procedure to achieve the desired performance of antenna. Computer simulation technology (CST) had been used as an environment for simulation.</span>
Safa N. Nafea
AIP Publishing
Safa Nassr Nafea
IEEE
Low side lobe level with low cost multilayer antenna for IEEE 802.16e applications such as WiMAX over industrial, scientific, and medical (ISM) band (5.725 – 5.875) GHz was presented shows high gain of 12.60 dB and fort-to-back ratio (F/B) of 18.55 dB with bandwidth around 163 MHz. The proposed multilayer antenna with reflector (MAWR) composed of a single plane feeding patch printed on Rogers RT/ Duroid 5880 substrate, covered with four Rogers RO6006 superstrates while a reflector layer located under feeding patch. Adding superstrate and reflector layers caused performance improvement by increasing gain and bandwidth with input reflection coefficient and side lobe level reduction. Computer Simulation Technology (CST) Microwave Studio was used as simulation environment.
Safa Nassr Nafea, Alyani Ismail, and Raja Syamsul Azmir Raja Abdullah
EMW Publishing
A low cost and easy fabrication multilayer antenna for wireless applications was presented to cover the industrial, scientific, and medical ISM band of (5.725-5.875) GHz with a gain of 11.7 dB. The antenna was composed of a feeding patch fabricated on a Rogers RT/Duroid 5880 substrate, and three superstrate layers of Rogers RO3006 were located above the feeding patch at a specific height for each layer. The superstrate layers were added to enhance the bandwidth and gain of the antenna and reduce its side-lobe level and return loss. The simulated and measured results of the operating frequency, return loss, bandwidth, and gain for the antenna were presented. CST Microwave Studio was used in this design's simulation.