Category: Journals

Maximizing the Gap Height in Gap-Waveguides with Helical Wires Operating at the Vicinity of Resonance

Walid Dyab, Mourad Ibrahim, Ahmed Sakr and Ke WuPublished in: IEEE Transactions on Microwave Theory and Techniques ( Volume: 71, Issue: 4, April 2023) DOI: 10.1109/TMTT.2022.3223082 Abstract: Gap-waveguides made of bed-of-nails are revisited with special interest given to the maximum practically achievable gap height. In the cases where the gap height is to be maximized, it is important to have […]

Wideband circularly polarized aperture coupled DRA array with sequential-phase feed at X-band

Mourad S. Ibrahim, Hussein Attia, Qiang Cheng, and Abdelhady Mahmoud Published in: Alexandria Engineering Jounral, Volume 59, Issue 6, December 2020, Pages 4901-4908 https://doi.org/10.1016/j.aej.2020.09.005 Abstract: novel 2 × 2 wideband dielectric resonator antenna (DRA) array with circular polarization and fed with a sequential-phase feeding network at the X-band is presented in this paper. The proposed DRA array is fed by an aperture […]

Variational Analysis of a Dually Polarized Waveguide Skew Loaded by Dielectric Slab

Walid Dyab, Ahmed Sakr, Mourad Ibrahim and Ke Wu Published in: IEEE Microwave and Wireless Components Letters ( Volume: 30, Issue: 8, August 2020) DOI: 10.1109/LMWC.2020.3004004 Abstract: An expression for the propagation constant, cutoff frequency, and associated fields of the first two modes in a waveguide filled with a tilted slab of the dielectric is derived using the variational analysis. The […]

Dually-Polarized Butler Matrix for Base Stations With Polarization Diversity

Walid Dyab, Ahmed Sakr and Ke Wu Published in: IEEE Transactions on Microwave Theory and Techniques ( Volume: 66, Issue: 12, December 2018) DOI: 10.1109/TMTT.2018.2880786 Abstract: With the great explosion of wireless systems and their applications and also with the limited enabling energy and spectrum resources available, it becomes more and more crucial to focus on the reduction of energy […]