Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 235 for “"microstrip"”.
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Conformal microstrip antennas
Microstrip antennas are widely used in several different technological areas including communication and navigation systems, weapons systems, radars, and telemetry and tracking systems. The microstrip antennas' physical features and simplicity of construction make them especially suited for these …
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Compact microstrip bandpass filter
… both transmitter and receiver. Parallel-coupled microstrip bandpass filter is one of the most popular filters in communication systems. However, this arrangement of parallel-coupled microstrip bandpass filter gives disadvantage in terms of size where the arrangement of this topology results in an …
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Multimode and Multiband Microstrip Antennas
… work on the broadband and multiband matching of microstrip patch antennas. Microstrip patch antennas suffer from many constraints on their performance. One major restriction is their narrow impedance bandwidth. An effective method to resolve this is adding more resonators to the antenna structure …
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Digitally controlled microstrip phased array.
… array. In this thesis, a digitally controlled microstrip phased array is discussed and built. This phased array consists of three parts: firstly, eight stripline 3-bit-PIN diodes-controlled hybrid ring coupled phase shifters, secondly, an equi-spaced half-wavelenth linear array of 8 square …
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Nonreciprocal coupling to microstrip resonators
"Inducing nonreciprocal wave propagation is a fundamental challenge across a wide range of physical systems in electromagnetics, optics, and acoustics. Linear, time-invariant systems are always reciprocal, but reciprocity can be broken through the action of a bias that is asymmetric under …
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Dielectric measurement based microstrip transmission line
… fields.The proposed technique present a simple microstrip transmission line method for the broadband radio frequency characterization of dielectric constant of non-dispersive materials. A microstrip line having impedance other than 50 Ω is designed and material under test is used as the …
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Reconfigurable phased microstrip antenna array with defected ground structure and defected microstrip structure for beam steering application
… structure (DGS), while the second is a defected microstrip structure (DMS), which due to their slow wave effect and band-stop property, are able to disturb surface current distribution, then change the element phase and hence steer the main beam. This work started with investigating and applying …
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Conformal Microstrip GPS Antenna for Missile Application
… performance goals are established. A conformal microstrip patch antenna is developed and simulated in Agilent’s Advanced Design System (ADS). The resulting antenna is constructed and characterized. Prototype testing verifies that the antenna maintains GPS signal lock regardless of orientation. …
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Computational electromagnetics for microstrip and MEMS structures
… will be introduced for the analysis of general microstrip structures. It is based on a newly developed matrix-friendly dyadic Green's function for layered media (DGLM), which is represented in terms of only two Sommerfeld integrals and is suitable for developing fast algorithms. The path …
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Numerical modeling of microstrip circuits and antennas
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1991.
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Design of microstrip patch antenna for the NPSAT1
This thesis presents the design of two circularly polarized patch antennas for operation at 1.767 GHz and at 2.207 GHz (for receiving and transmitting, respectively) on NPSAT1 satellite. The design requirements for the antennas include a VSWR of less than or equal to 2:1 for 50 omega reference …
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A computational tool for microstrip planar filter design
… on Matlab-GUIs. Furthermore, the tool designs Microstrip line filters with experienced engineers’ design quality in a shorter time than by traditional design procedures. FILSoft is a user friendly design tool, the design procedures through this tool start from lumped elements filter up to …
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Reconfigurable microstrip antennas with tunable radiation pattern characteristics
… dissertation, designs for reconfigurable beam microstrip antennas with tunable radiation characteristics have been proposed. The method to achieve these designs is the reconfigurable parasitic element (s) of tunable electrical size, placed in close proximity to the driven patch. A tuning …
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Novel narrowband microstrip filters for wireless communications systems
The novel resonant structures based on microstrip integrated circuit technology have been developed and extensively studied in this research project for filter applications in next generation wireless communication systems. Several novel microstrip bandpass filter structures have been introduced …
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Theory and applications of chirality in microstrip antennas
… of chiral materials as substrates of microstrip antennas offers novel radiation properties over achiral microstrip antennas. A number of representative antennas are analyzed with respect to radiation pattern, main beam position, and directivity.
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Design of microstrip antenna based on different material properties
Microstrip antenna has several advantages compared to conventional microwave antenna. These type of antenna are light weight, low volume and thin profile configurations, which can be made conformal. The cost of fabrication is also low and can be manufactured in a large quantities. This project will …
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Microstrip Superconducting Quantum Interference Devices for Quantum Information Science
… at millikelvin temperatures. We have developed a microstrip superconducting quantum interference device (SQUID) amplifier (MSA) to provide the first stage of amplification for these systems. Employing sub-micron Josephson tunnel junctions for enhanced gain, these MSAs operate at microwave …
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Fast Electromagnetic Modeling of Multilayer Microstrip Antennas and Circuits
… together, a fast integral equation solver for microstrip structures in multilayer media is developed. Examples of circuits and antennas are presented to demonstrate the accuracy and efficiency of this solver.
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Investigation of tapered multiple microstrip lines for VLSI circuits
Tapered, coupled, microstrip transmission lines are an increasingly important part of high-speed digital circuits. These lines, used as interconnects between integrated circuit devices, are modeled using an iteration-perturbation approach applied in the spatial domain. The approach is used first to …
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