Study of Lens Arrays for Radiative Near Field Communication in the H-Band

This master thesis explores the capacity of MIMO arrays for communication in the radiative near field through antenna design. This research applies an in-house MATLAB model based on free space Green’s function to calculate the channel matrix, revealing the potential increase of capacity through the use of incoherent arrays with directive...

Demonstration of near Diffraction-Limited Imaging using a THz CMOS-Integrated Camera

This work demonstrates the imaging of (near) diffraction-limited images in the THz domain using a CMOS integrated camera. A Quasi Optical Setup is fabricated, aligned the radiation patterns and losses are characterized.

On design of tunable leaky waveguide antennas for a large format lens based focal plane array with wide scanning capabilities

Recently, there has been an increasing demand for security in public places. As a result, non-destructive and fast millimetre-wave and submillimetre-wave imaging systems have gained more and more attention.<br/>This project is based on Concealed Objects Stand-off Real-Time Imaging for Security (CONSORTIS), which is a European next-generation...

Analysis of Core-Shell Leaky-Wave Lens Antennas based on a combination of Physical Optics and Asymptotic Techniques

In the framework of this MSc thesis the analysis of core-shell leaky-wave lens antennas is presented, based on a combination of asymptotic and Physical Optics techniques. This study aims to develop an analysis approach which can be subsequently used for the optimization of the Fly’s Eye antenna concept, through enabling the investigation of...

On the Design of Lens Array Architectures for the TIFUUN Imaging Spectrometer

In the framework of this MSc thesis, the analysis and design guidelines for part of the quasi-optical system of a proposed astronomical instrument, called TIFUUN, are presented. The TIFUUN instrument is an imaging spectrometer, planned to be placed in the ASTE telescope to perform ground-based astronomical observations in the mm-submm wavelength...

A GO/PO tool for synthesizing shaped multi-surface dielectric lens antennas

In this thesis, an efficient optimization method is described for synthesizing lens antennas fabricated in low permittivity plastic materials to achieve wide scanning performances. The method is based on an antenna in reception representation. The optimized parameters are the location and orientation of the antenna feeder, lens angular region...

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...

MMIC packaging using Flip-Chip technology at G band

Front-end Monolithic Microwave Integrated Circuits (MMICs) have recently become commercially available for frequencies above 100 GHz. However, achieving low-loss and broadband interconnections between the antenna and MMICs is challenging for integrated front ends at these frequencies. This thesis presents the characterization of a flip-chip...

Spectral Analysis of The Infinite Slot Leaky Wave Antenna & Leaky Wave Antenna With Multiple Slots

Within the framework of this thesis, the analysis of the infinite slot leaky wave antenna is presented and a new geometry for the feed of a leaky lens is explored. Firstly, the analysis of the propagating leaky wave modes (TM0 and slot modes) is done leading to the findings about the location of the slot pole w.r.t. k0, as well as the...

Geometrical Optics - Physical Optics model of the mutual coupling between antennas under integrated lenses

Lens array architectures are being developed for high frequency applications such as phased arrays for 5G point-to-point communications, Fly’s Eye lens arrays for wideband wireless communications and scanning phased arrays at sub-millimeter wavelengths. Each of these applications employ different feed configurations, lens geometries and require...

EM Interference Analysis of the Fly's Eye Antenna System in Stadium Scenarios

In this thesis the interference aspect of the Fly's Eye multi-beam antenna system of \cite{FlyEye}, a new base station concept to tackle the high data rate demands in spart stadiums is investigated. In particular the co-polar interference performance and the degree of multipath interference within the single spatial channel are considered. A...