A. El-Hajj

Publications
Influence

Cognitive Radio Transceivers: RF, Spectrum Sensing, and Learning Algorithms Review

L. Safatly, Mario Bkassiny, M. Al-Husseini, A. El-Hajj
Engineering
24 March 2014

A cognitive transceiver is required to opportunistically use vacant spectrum resources licensed to primary users. Thus, it relies on a complete adaptive behavior composed of: reconfigurable radio… Expand

Characteristic modes of a rectangular aperture in a perfectly conducting plane

A. El-Hajj, K. Y. Kabalan
Mathematics
1 October 1994

The objective of the paper is the analysis of a rectangular aperture in a perfectly conducting plane using the characteristic mode theory. The problem is first formulated as an operator equation… Expand

A UWB antenna combined with a reconfigurable bandpass filter for cognitive radio applications

M. Al-Husseini, A. Ramadan, M.E. Zamudio, C. G. Christodoulou, A. El-Hajj, K. Kabalan
Computer Science
IEEE-APS Topical Conference on Antennas and…
17 October 2011

A single-port small-size antenna for cognitive radio applications is presented. Expand

A transfer function computational algorithm for linear control systems

A. El-Hajj, K. Kabalan
Computer Science
1 April 1995

In this paper, a method is developed to efficiently compute the closed loop transfer function and intermediate transfer functions of a linear system. Expand

A reconfigurable U-Koch microstrip antenna for wireless applications

A. Ramadan, K. Kabalan, A. El-Hajj, Shahwan Khoury, M. Al-Husseini
Physics, Engineering
2008

In this paper, a low-cost multiband printed-circuit-board (PCB) antenna that employs Koch fractal geometry and tunability is demonstrated. Expand

New Multi-Band Microstrip Antenna Design for Wireless Communications

J. Costantine, K. Kabalan, A. El-Hajj, M. Rammal
Engineering
IEEE Antennas and Propagation Magazine
1 December 2007

This paper presents a new approach for the design of a multi-wideband microstrip-patch antenna. The radiating elements in this antenna are composed of rectangular slots following a Chebyshev… Expand

A Simple Multiband Printed Bowtie Antenna

Y. Tawk, K. Kabalan, A. El-Hajj, C. G. Christodoulou, J. Costantine
Computer Science
IEEE Antennas and Wireless Propagation Letters
10 June 2008

This letter presents a new approach for the design of a multiresonant printed bowtie antenna. Expand

An infrastructure-aided cooperative spectrum sensing scheme for vehicular ad hoc networks

Kim Baraka, L. Safatly, H. Artail, A. Ghandour, A. El-Hajj
Computer Science
Ad Hoc Networks
1 February 2015

The Wireless Access in Vehicular Environments (WAVE) protocol stack has been recently defined to enable vehicular communication on the Dedicated Short Range Communication (DSRC) frequencies. Expand

Web‐based tutoring and testing in a computer networks course

A. Kayssi, A. El-Hajj, Mahmoud El Assir, Ramzi Sayyid
Computer Science
1999

In this article, a Web interface for a course on computer networks is presented that integrates course material, student registration, objective exams, and grading. Expand

A simple dual-port antenna system for cognitive radio applications

M. Al-Husseini, A. El-Hajj, Y. Tawk, K. Kabalan, C. Christodoulou
Computer Science
International Conference on High Performance…
12 August 2010

This paper presents a simple antenna system design for cognitive radio applications. Expand

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