Showing papers by "Mohamed Essaaidi published in 2016"

Design of Compact Multiband Antenna with Band-Rejection Features for Mobile Broadband Satellite Communications

Abstract: This paper presents the design of a compact printed multi-band antenna for satellite communications within vehicular applications. The designed antenna is characterized by its compact size of 24mm × 18mm and multiple resonances over WiMAX, WLAN, 5GHz U-NII, C-band, X-band, Ku-band, K-band and Ka-band. The performance of the multi-band antenna is investigated, and its equivalent circuit model is presented. Good performance is achieved over all the operating bands, with a relatively high gain and efficiency. Furthermore, as the interference with coexisting wireless systems can have a severe impact on the performance of the antenna, four variants of the antenna are proposed incorporating band rejection features within the antenna design. Embedded quarter-wavelength spurlines, slots, and parasitic elements were used.

Reconfigurable T-shaped antenna for S-band applications

Abstract: This paper present a reconfigurable T-shaped antenna how can operate easily at seven frequencies in S-band, the switching technique consist of an equivalent approach to PIN Diode it is to change the state of the distribution of current by insert a simple micro strip line in different positions, the simulated and de measured prototype frequency is respectively 3.12 GHz, 3.2 GHz, 3.31 GHz, 3.44 GHz, 3.56 GHz, 3.76 GHz, 4 GHz. The antenna is fabricated using FR4 substrate with relative permittivity of 4.4 and pert tangent of 0.02.

Rectangular Dielectric Resonator Antenna (RDRA) for anti-collision short range radar (SRR) application

Abstract: This paper presents the design of Rectangular Dielectric Resonator Antenna (RDRA) feed by a micro-strip line for anti-collision radar SRR application at 24 GHz. The proposed RDRA operates at a frequency of 24 GHz with a high dielectric constant of 41. The simulated RDRA has a high radiation efficiency (88.4 %). The return loss, radiation pattern and gain of the proposed antenna are evaluated. The simulation process was carried out using Computer Simulation Technology (CST) Microwave Studio.

A UHF RFID tag antenna with improved bandwidth

Abstract: in this paper, a new broadband RFID tag antenna is presented. The antenna has a simple structure and low profile with only one layer of FR4 dielectric substrate and metallization. By choosing a proper dimension of the short dipole and the T-matching network, a good and broadband impedance matching can be achieved. The obtained impedance bandwidth (S 11 <−10 dB) across the operating band can reach about 232 MHz (24.57%) for the UHF band, which is from 860 to 960 MHz The proposed design has an omnidirectional radiation pattern and a simulated flat read range (almost 4.05 m) over the entire RFID bandwidth.

A high gain Novel Dielectric Resonator Antenna (NDRA) for anti-collision short range radar (SRR) application

Abstract: This paper presents the design of Novel Dielectric Resonator Antenna (NDRA) feed by a micro-strip line for anti-collision radar SRR application at 24 GHz. The proposed NDRA operates at a frequency of 24 GHz with a dielectric constant of 18. The simulated NDRA has a high gain (12.24 dB) and a high radiation efficiency (94 %). The return loss, radiation pattern and gain of the proposed antenna are evaluated. The simulation process was carried out using Computer Simulation Technology (CST) Microwave Studio.

A Rigorous Proof for the Strong Goldbach Conjecture

Abstract: In this paper, a rigorous proof of the strong Goldbach Conjecture is provided. This proof is mainly based on a very special expression of even numbers we propose and which takes the form of (2n + 6). Even numbers expressed in this form can be expressed as sums of two primes of the form of (3 +2i ) and (2n + 3 2 i), where I and n are positive integers. We show that it is always possible to find at least one pair of prime numbers according to the former two expressions for any given even number greater or equal to 6. Moreover, the prime numbers theorem is used to investigate the number of primes’ pairs corresponding to even numbers. The obtained results showed that all even numbers have at least one pair of primes verifying this conjecture. Thus, this result provides a rigorous proof for Goldbach conjecture which is still considered, to our best knowledge, among the open problems of mathematics.. General Terms Number theory, Prime numbers, Algorithms.

A novel compact CPW OCSRR strucutre for 2.45 GHz rectenna application

Abstract: In this paper, a new and compact rectenna is proposed for the application of ISM band at 2.45 GHz using open complementary split ring resonator (OCSRR). The simulated rectifying efficiency and DC voltage were, respectively 57% and 0.9 V when the input power to the rectifying circuit was 0dBm (1mW). The highest efficiency, 62%, was achieved at 2.45 GHz for 3dBm input power and for a charge load 1kΩ.

Engineering Education in Northwest MENA Countries: Challenges and Opportunities for the Twenty-First Century

Abstract: Background and Purpose Engineering education in northwest Middle East and North Africa (MENA) or Maghreb countries, and more specifically in Algeria, Morocco, and Tunisia, has several similarities in terms of the model it is based on and also the challenges and opportunities it is concerned with. In contrast with other countries from the MENA region, these countries adopt the French engineering education mainly for historical reasons. In this system, the engineering schools “Grandes Ecoles” are generally higher education institutions that do not necessarily belong to a university as is the case in many higher education systems in the rest of the MENA region and worldwide. These schools are today facing several complex and multifaceted challenges related with different issues such as accreditation and quality assurance, engineering education paradigms, English communication skills, and entrepreneurship and innovation.