Study on the Number of Independent Beams from Planar Domains

Future communication scenarios will require massive Multiple-input multiple-output (MIMO) by the use of multi-beam antenna systems. Maximizing the number of beams for a given antenna size is paramount given that the space allocated to the antenna is often limited. This work aims at evaluating the maximum number of beams by analyzing the SIR in...

Towards the design of an imaging setup using photoconductive antennas

Photoconductive antennas (PCAs) are an interesting candidate for imaging systems due to their relatively low cost and ability to provide a bandwidth of hundreds of GHz. The large bandwidth of PCAs allows for sub-millimeter depth resolution. However, the often-used single-element PCAs are intrinsically limited in the amount of power they can...

Volumetric Method of Moments: A Numerical Tool for High Frequency Problems Analysis

In this thesis a Volumetric Method of Moments (V-MoM) is developed to analyse accurately, and ease the design of small size lens antennas, and to estimate the power emitted by warm bodies constituted by realistic materials, and having arbitrary geometries. hanks to the application of the volume equivalence theorem and the use of a structured...

GUI for System Dimensioning and QO Channel Analysis of Pulsed Pico-second Radar

THz time-domain systems driven by photoconductive antennas (PCAs) promise a bandwidth of the order of hundreds of GHz. This characteristic can be utilized to build see-through radars with sub-mm resolution and a field of view comparable to the current mm-wave radars at a relatively low cost. These radars can solve the issues in the field of...

A THz Lens Antenna fed by a Photoconductive Connected Dipole Array

Photoconductive antennas have been used extensively for THz radiation the last few years. In this thesis, we propose a photoconductive connected dipole array consisting of 36x36 elements that is used as a feed in a THz silicon lens and radiates in a band ranging from 100 GHz to 5 THz. Specifically, we compute theoretically the radiated field...

Analysis and Design of Pulsed Photoconductive Antennas

Photoconductive antennas (PCA) are widely used in contemporary THz systems, especially in terahertz time-domain spectroscopy. They are used to radiate and receive THz power. The study of the generation and reception of THz radiation involves both semiconductor theory, electromagnetics, and antenna theory. In this work, after a review of some...

Analysis and Design of Dual Band THz Imager Based on Incoherent Detectors

This work focuses on designing and evaluating the performance of a dual-band passive imager for security applications at sub-mm wave regime. The bolometer based kinetic inductive detectors are used as incoherent detectors on the focal plane array of this imaging system. In order to realize a dual-band system, two absorber sets are designed to...

Characterization of Printed Transmission Lines at High Frequencies

In this contribution, a quasi-analytical model is proposed allowing for fast characterization of a wide variety of printed transmission lines in terms of characteristic impedance, effective dielectric constant and losses. These losses are composed out of conductor losses, dielectric losses and radiation losses due to space and surface wave...

Wideband, Wide-Scan Planar Connected Slot Array Enhanced with Artificial Dielectrics

In this thesis, the design of planar connected array of slots loaded with artificial dielectric layers (ADLs) is proposed to achieve wideband and wide-scan capabilities. ADLs are used due to the potential advantage of low surface-wave loss and high radiation efficiency. Whereas, the connected array of slots avoid the implementation of baluns...

Ultra -Wideband Leaky- Wave Antenna for Medical Imaging

Cancer can be viewed as a curse on life of any man or woman. Although some tumors that are malignant can be curable, it comes at a cost of unbearable pain and mental trauma. X-ray based techniques are being used for many decades for detecting tumors. These techniques are applied at the expense of exposure to high ionized radiation levels....