WorldCat Identities

Morin, Gilbert A.

Overview
Works: 18 works in 38 publications in 1 language and 71 library holdings
Roles: Author
Publication Timeline
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Most widely held works by Gilbert A Morin
Analysis and experiments on the Frequency-Independent Strong-Signal Suppressor (FISSS) by David Sychaleum( Book )

3 editions published in 1998 in English and held by 8 WorldCat member libraries worldwide

As military radio communications systems require ever increasing information bandwidths, the protection afforded by spread spectrum techniques decreases proportionally. Auxiliary interference suppression techniques could play an important role in making up for this decreased protection, thereby allowing higher data rates. One such auxiliary technique is the frequency independent strong signal suppressor (FISSS), the subject of this report. Laboratory experiments have found that the FISSS can provide significant interference suppression for a variety of interference waveforms. The report documents efforts made to overcome the following problems in FISSS research: the lack of a theory to explain its operation; the lack of FISSS performance measurement, characterization, and recording; and non-linearities that cause intermodulation products, thereby degrading performance. Included in these efforts was construction of devices operating at frequencies of 1.5 and 10 gigahertz. Progress reported includes some inroads in the theory, thorough measurement of several devices, some means of minimizing intermodulation effects, and demonstration of noise interference suppression
44.5 GHz PHEMT power amplifier by Communications Research Centre (Canada)( Book )

3 editions published in 1997 in English and held by 7 WorldCat member libraries worldwide

Presents a design procedure for a 44.5-gigahertz gallium arsenide monolithic microwave integrated circuit power amplifier, using pseudomorphic high electron mobility transistors (PHEMTs), for future application in a phased array antenna system. Begins with an outline of the initial determination of the appropriate transistor size and its bias condition in order to meet the amplifier specifications. Non-linear design techniques, used to predict amplifier performance at its maximum power level of operation, are also introduced. Input and output matching networks are developed and the predicted amplifier performance, including associated bias networks, is presented. The final amplifier layout is shown and the amplifier performance predictions are confirmed through the use of an electromagnetic simulation design tool. Finally, the feasibility of cascading the amplifier, to allow sufficient gain to be achieved for a driver stage application, is examined
Gain measurement of a cavity-backed spiral antenna from 4 to 18GHz using the three-antenna method by Claude J Brochu( Book )

3 editions published in 1998 in English and held by 7 WorldCat member libraries worldwide

Presents results of the measurement of the maximum gain of a cavity-backed spiral antenna using the three antenna method over the 4-18 gigahertz range. The method was extended to obtain the circularly polarized co- and cross-polarization gain of the antenna under test. This method required the use of two other linearly polarized (LP) antennas (quad-ridged horns). Two sets of gain measurements were performed using the LP antennas with their polarization oriented horizontally then vertically. The report also describes the three-antenna method algorithm, the MATLAB program written for this application, and the experimental steps and procedures required to implement the method. Program listings are appended
A Circular polarization selective surface made of resonant helices by Gilbert A Morin( Book )

4 editions published between 1995 and 1996 in English and held by 7 WorldCat member libraries worldwide

A circular polarization selective surface (CPSS) is a surface that reflects one sense of circular polarization but transmits the other sense. While linear polarization selective surfaces (usually abbreviated PSS) are fairly common, CPSS's have attracted attention only recently. In this report, a new CPSS with improved characteristics is presented and potential applications are discussed. This new CPSS is made of special square helices. Because the helices can be supported at their extremities, this CPSS does not need a dielectric support as other CPSS's do and therefore can be made more transparent. The response of the CPSS to a plane wave excitation was simulated using the method of moments for thin wires. Mutual coupling and losses were taken into account. Simulation results show that the radar cross section of the surface to one circular polarization is 50 times higher than to the other polarization. A CPSS has been fabricated. Transmission measurements show that the surface permits most of one circular polarization to pass through while rejecting the other polarization. The rejection ratio is more than 15 dB. These results are in good agreement with the theory. Three potential applications of CPSS's in the field of reflector antennas are reduction of sub-reflector blockage in dual reflector antennas, frequency reuse through polarization diversity in a dual-offset reflector, and design of a mirror antenna for circular polarization
Optical alignment of the spherical antenna measurement system by Defence Research Establishment Ottawa( Book )

3 editions published in 1997 in English and held by 6 WorldCat member libraries worldwide

Describes a custom designed system and novel techniques developed to perform a precision alignment of a microwave antenna measurement range using optical instrumentation. The system is an indoor spherical test range located in an anechoic chamber. The alignment hardware consists of several levels, an electronic theodolite with built-in autocollimation capability, and a unique target mirror assembly with the target viewable from both sides. A hand-held programmable calculator is used to calculate angular positions and distances. The instrumentation allows convenient measurement and monitoring of both the range alignment and the orthogonality and intersection of the multi-positioner spherical system axes. Numerous techniques and procedures developed for optical alignment are detailed, with step-by-step instructions to guide the user toward a precise optical alignment. The appendix includes a listing of a program for processing the theodolite readings and description of a technique to measure the phase centre of an antenna
Radio-frequency fields around conductors in plasma by Gilbert A Morin( Book )

2 editions published between 1987 and 1988 in English and held by 6 WorldCat member libraries worldwide

Study of future antenna technologies for shipboard satellite communications by Defence Research Establishment Ottawa( Book )

3 editions published in 1997 in English and held by 6 WorldCat member libraries worldwide

Documents a study of future naval satellite communications for the Canadian Navy that investigated possible technology gaps in the area of satellite antenna systems for military applications, focusing on the difficulty of installing large antenna systems on smaller size ships. After an overview of naval allied use of military satellite communications, two main technologies are reviewed for multi-band and multi-beam antennas: reflectors and phased arrays. Advantages and drawbacks of each are discussed
Data acquisition software for DREO's near-field antenna measurement facility by Defence Research Establishment Ottawa( Book )

4 editions published between 1994 and 1995 in English and held by 5 WorldCat member libraries worldwide

DREO has built an antenna anechoic facility for microwave and millimetre-wave measurement that includes a spherical near-field antenna measurement system that allows far-field measurement of small antennas and near-field measurement of larger antennas (up to one meter) within the chamber. This report describes the facility, including the equipment, instrumentation, and the DREO Antenna Measurement Acquisition (DAMAS) software that was developed. DAMAS was developed to control the measurement and acquisition process in real time, and to present the data to the operator, thus streamlining the process so that an antenna could be accurately characterized in the minimum amount of time
Tri-band coaxial antenna feed for satellite terminal : ku-band orthomode transducer, x-band coaxial waveguide transition and polarizer study by Nicolas Gagnon( Book )

1 edition published in 2006 in English and held by 3 WorldCat member libraries worldwide

Design and measurement of a 44.5 GHz PHEMT power amplifier by Scott R McLelland( Book )

1 edition published in 2000 in English and held by 3 WorldCat member libraries worldwide

The work described in this report represents the design phase of a gallium arsenide monolithic microwave integrated circuit power amplifier using pseudomorphic high electron mobility transistors (PHEMTs). The main purpose of the work was to investigate the possible performance of a power amplifier at 44 gigahertz for future application in a phased array antenna system. The design of a two stage amplifier, covering the frequency range 43.5-45.5 gigahertz, is described along with predicted & measured performance results. The final layout of the complete chip is also presented
Visualization of radiation-pattern characteristics of phased arrays using digital phase shifters by Michel Clénet( Book )

2 editions published in 2003 in English and held by 2 WorldCat member libraries worldwide

This article describes graphical investigations of the array factor of phased arrays with digital phase shifters. A software program, based on basic antenna array theory, has been developed in MATLAB to obtain the main array characteristics (array factor & directivity). The array factors of linear arrays of different sizes with different types of phase shifters are studied as a function of the number of bits & the frequency. Unconventional two-dimensional color graphical representations are used to identify some characteristics of the array factor or arrays with digital phase shifters that can not be so clearly & quickly visualized with conventional graphical representations. In particular, the effects of quantization on the array factor for arrays of different sizes and for phase shifters with different numbers of bits, scan angle, and frequency, are shown using this representation. Numerous data are also provided
A design optimization framework for multi-band body-of-revolution antenna feeds : application to a prime-focus dual-band Ku/X coaxial feed by Éric Choinière( Book )

1 edition published in 2005 in English and held by 2 WorldCat member libraries worldwide

A system study of requirements for SHF/EHF-terminal phased-array antennas by E. B Felstead( Book )

2 editions published in 1997 in English and held by 2 WorldCat member libraries worldwide

There is much current interest in the use of phased array antennas for military satellite communications terminals. These antennas present definite advantages over conventional dish antennas, such as electronic steering capability, conformal surface potential, and graceful degradation. In view of the potential of phased arrays, CRAD initiated an R & D project, as part of the Military Information and Technology Infrastructure (MITI) thrust, to provide advice on issues such as performance benefits, potential technical improvements, implementation issues, and potential market niche areas. In this report, this process is initiated by generating a set of specifications for the development of such phased array antennas. Five types of terminals are analyzed, namely: EHF manpack, EHF airborne, EHF land transportable, multi-band vehicle mounted, and multi-band shipboard. For the five strawman applications, performance specifications such as EIRP, G/T, etc. are provided
A System study of requirements for SHF by E. Barry Felstead( Book )

1 edition published in 1997 in English and held by 1 WorldCat member library worldwide

Phased array antennas are thought to be a possible solution to some problems with antennas used in military satellite communications. This report presents a set of specifications for the development of phased array antennas for military satellite communications terminal applications in the super high and extra high frequency (SHF and EHF) bands. Five types of terminals are analyzed: EHF manpack, EHF airborne, EHF land-transportable, multi-band vehicle-mounted, and multi-band shipboard. The five types of applications are first discussed in general and then the system-level requirements for each application are given
Study of a waveguide antenna implemented in laminated material by Jack O Litzenberger( )

1 edition published in 2002 in English and held by 1 WorldCat member library worldwide

This document presents the investigation of a novel end-fire antenna implemented in laminated material. This study is related to the development of a phased array for the AEHF Military Satellite Communication Systems. This work includes theoretical analysis, computation of the developed models and measurement of the realised prototypes at 20.7GHz. The antenna element consists of a radiating rectangular waveguide. As a laminated dielectric material, like LTCC material, is supporting the antenna, the vertical walls need to be formed with vias of specific pitch. An effective coaxial-to-waveguide transition has also been developed to feed the radiating element. The results show that this laminated waveguide can be used as an integrated radiating element in the AEHF band for military satellite communications. A five-element array has also been prototyped. Although the results show low mutual coupling between the elements, additional work needs to be carried out to improve the array radiation characteristics
Mutual coupling between rectangular dielectric resonator antenna elements by Defence Research Establishment Ottawa( )

1 edition published in 1998 in English and held by 1 WorldCat member library worldwide

Dielectric resonator antennas (DRAs) have been suggested as potentially efficient antennas for use in personal communication systems, global positioning systems, and wireless communication networks, due to such advantages as large bandwidth, low profile, high efficiency, small size, ease of fabrication, and low production cost. This paper examines the characteristics of DRAs, both as individual radiating elements and as elements in array environments. Numerical methods are used to obtain detailed information with respect to resonant frequency, bandwidth, scattering parameters, input impedance, field structures, and radiation patterns on which DRA design is based. The obtained information is then employed to help understand and quantize the interaction between elements in close proximity (mutual coupling). This coupling analysis provides important information for the array design process and for the positive exploitation of these coupling characteristics. Simulation results are presented and compared to those from experimental models, and novel single-feed multi-element antennas are described which have increased bandwidth and enhanced radiation patterns
Investigation of a modular antenna array configuration and a feeding technique for brick architecture by Defence Research Establishment Ottawa( )

1 edition published in 1997 in English and held by 1 WorldCat member library worldwide

The satellite communications industry, following the trends seen in personal communications systems, is pursuing the development of smaller and more capable communication terminals. Several antenna technologies and architectures have been studied for a fixed-beam portable communications terminal operating at high frequencies, e.g. 20GHz (receive) and 30GHz (transmit), and capable of providing multiple data links (data, voice, video). However, additional work is required to develop a modular "brick" type of architecture for this application. This report investigates two aspects of the problem: a modular antenna array configuration, and a suitable feeding scheme involving perpendicular interconnection that is essential to the design of the brick architecture. An antenna array patterns program was developed within the Matlab environment. This versatile tool can be used to predict planar array radiation patterns for design and general illustration purposes. The program can evaluate, display and analyze two- and three-dimensional radiation patterns, and it can easily be modified to suit specific user requirements. An array configuration suitable for fixed-beam portable satellite applications at 30GHz was developed using this program. To acquire experience with the design of microstrip patch antennas, and to validate the simulation software that would be used throughout this report, a critical coupling analysis was then conducted for conventional aperture-fed microstrip patch antennas. Simulation results were analyzed to determine the behavior of various parameters for critically coupled antennas, and charts providing a helpful guide for the design of microstrip patch antennas were produced. The development of the perpendicular interconnection was then initiated with the simulation, fabrication and successful testing of a perpendicular substrate microstrip line-to-line
Asystem study of requirements for SHF/EHF-terminal phased-array antennas by E. Barry Felstaed( Book )

1 edition published in 1997 in English and held by 1 WorldCat member library worldwide

 
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