Haidar Al-Anbagi

• Master of Engineering
• University of West Bohemia

Power dividers are the most important tools in microwave systems such as mixers, frequency multipliers, and feeding networks in antennas. So far, in designing power dividers, various methods have been used to reduce the size and eliminate unwanted harmonics. In this paper, using a resonator structure and low pass filter, a Wilkinson power divider w...

Nowadays, countless daily life services are conveniently provided to the users by connecting billions of devices through Internet of Things (IoT). However, current IoT networks are not yet ubiquitous. They are unavailable in the less inhabited areas such as oceans, forests, and deserts. Accordingly, for omnipresent coverage of the future generation...

This article presents a power-efficient low noise amplifier (LNA) with high gain and low noise figure (NF) dedicated to satellite communications at a frequency of 435 MHz. LNAs’ gain and NF play a significant role in the designs for satellite ground terminals seeking high amplification and maintaining a high signal-to-noise ratio (SNR). The propose...

Internet of Things (IoT) networks connect billions of devices in endless daily applications. However, the IoT networks lack coverage in less populated areas such as oceans, deserts, forests, and rural, isolated regions. Therefore, future generations of communications must get satellites involved for ubiquitous coverage of IoT networks. The Low Eart...

The popular small satellites already attracted attention towards the integration into the future ubiquitous Internet of Things (IoT) networks. Small satellites can act as IoT base stations to efficiently collect data from sensors in remote areas and offload it to ground stations (GSs). The size constraints of small satellites, however, impose limit...

A conventional ground station can establish a single downlink with only one satellite at a time through steerable high-gain antenna. In addition to the lack of tracking more than one satellite at once, such single radio communication is highly vulnerable to outages when experiencing severe degrading circumstances or even with steering engine failur...

This paper presents a compact dual-band reconfigurable antenna. This antenna covers the Long-Term Evolution (LTE) bands 1.9 GHz, 2.4 GHz, and 3 GHz. The reconfigurability was achieved with two PIN-diodes which provided four switching states. Both frequency and radiation characteristics have consistent results. The antenna gain was evaluated at ever...

This study contributes to the reception quality improvement of small satellites’ signals. Traditionally, the data from a satellite is downloaded through single radio link to the related steerable ground station. This single communication is problematic as it is highly exposed to outages when the channel is deeply affecting the signal or when the st...

Popular small satellites host individual sensors or sensor networks in space but require ground stations with directional antennas on rotators to download sensors’ data. Such ground stations can establish a single downlink communication with only one satellite at a time with high vulnerability to system outages when experiencing severe channel impa...

This article proposes a new branch-line coupler design using two trapezoid-shaped resonators, applied in side and center. The standard 35 and 50 Ohms λ/4 transmission lines (TLs) are attained through the variations of the resonator’s TLs width. Since there are not explicit formulas for the suggested trapezoidal shape resonator, the design procedure...

This paper proposes a power-efficient low noise amplifier (LNA) for wireless sensor networks (WSN) applications. The energy consumption of LNAs plays a significant role in the design of WSN applications seeking less energy consumption. The transistor (BP1V01M0) is used in this article to get a low noise figure (NF) of 1.2dB and high power gain of 1...

The operation of the new proposed spherical slotted antenna covered by layers of dielectric material and plasma was analyzed numerically in this paper. By utilizing the Integra-functional equations method, the optimum thickness of dielectric material layer and suitable conditions which improve the operation of this antenna are analyzed here by MATH...

Database management system is important and fundamental at present. Access databases are important and efficient storage tools. In this system, a database management system is designed and built to fulfill the requirement of the Legal Affairs Department - Investigative Committees Division - University of Diyala. The database was built using Microso...

The increase in global energy consumption and the expected exhaustion of traditional energy sources, especially in the last century, led to an increased search for alternative sources of energy. The use of renewable energy sources has become extremely important to reduce dependence on fossil fuels. Due to the stochastic nature of the renewable ener...

The increase in global energy consumption and the expected exhaustion of traditional energy sources, especially in the last century, led to an increased search for alternative sources of energy.The use of renewable energy sources has become extremely important to reduce dependence on fossil fuels. Due to the stochastic nature of the renewable energ...

Frequency spectrum scarcity has been a strong research motivation. Those researches have focused on developing methodologies to utilize frequency spectrum as much as it could be. Meanwhile, this spectrum utilization and its great revenue should not affect the quality of services being provided by network providers. In most cases, statistics have sh...

Two techniques of the most known ones for peak to average power ratio (PAPR) reduction of orthogonal frequency division multiplexing (OFDM) are selected mapping (SLM) and partial transmit sequence (PTS). Both schemes were proposed as distortion less PAPR reduction algorithms. However, it has been an argument to prove which scheme is the most effici...