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.
Results
Showing 1 to 20 of 72 for “"impedance matching"”.
-
UHF RFID Antenna Impedance Matching Techniques
… range is maximized when a tag antenna’s input impedance is conjugate matched to the RFIC input impedance. Since RFIC input impedance includes capacitive reactance, optimized antenna input impedance includes compensating inductive reactance.</p> <p>The T-match network adds inductive matching …
-
Impedance matching circuit for piezoelectric transducers.
Thesis. 1978. M.S.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
-
Impedance matching for structural-acoustic control
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
-
Tunable Impedance Matching Network Fundamental Limits and Pracitical Considerations
… which arises from these factors is that of impedance mismatch. Recently, tunable impedance matching networks have begun to be implemented to address this problem. ^ This dissertation presents the first in-depth study on the frequency tuning range of tunable impedance matching networks. Both …
-
Controllable Transformation Matching Networks for Efficient RF Impedance Matching
… plasma processing typically relies upon tunable matching networks to transform the variable plasma load impedance to a fixed impedance suitable for most rf power amplifiers. Plasma applications require fast tuning speed with precise control from the matching networks while operating at a high …
-
A Synthesis Method for Broad-Band Antenna Impedance Matching Networks
Made available in DSpace on 2014-12-04T21:02:49Z (GMT). No. of bitstreams: 1 0013580.pdf: 3984493 bytes, checksum: 7c8c4af6d09a88a62e4f0aa05b8a6bb4 (MD5) Previous issue date: 1955
-
Impedance matching and energy shunting control for nonpositive real structures
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
-
Characteristic Modes for Impedance Matching and Broadbanding of Electrically Small Antennas
… a unified approach to model the antenna input impedance, rather than the haphazard array of approaches that are currently used. Using our model for the input impedance, we are then able to establish the conditions under which a small antenna can be effectively impedance matched, and analyze …
-
Hybrid Silicon Mode-Locked Laser with Improved RF Power by Impedance Matching
… rates. In this thesis, we design and discuss an impedance matching solution for a hybrid silicon mode-locked laser diode to lower phase noise and reduce the drive power requirements of the device. In order to develop an impedance matching solution, a thorough measurement and analysis of the …
-
Harvesting energy from non-ideal vibrations
… This methodology includes a broad-band impedance matching theory and a power electronics architecture to implement that theory. The generalized impedance matching theory extends the well known single frequency impedance matching model to a multi-frequency impedance matching model. By …
-
Novel Cladding Designs for Engineering Electromagnetic Scattering
… address the inherent challenges associated with impedance matching and radiation/reception efficiency. By enclosing the antenna with suitably designed spherical metamaterials or ultrathin meta surfaces, the impedance matching is improved and the overall efficiency of the antenna is significantly …
-
Energy Harvesting Circuit with Input Matching in Boundary Conduction Mode for Electromagnetic Generators
… AC-DC boost rectifier is designed to match the impedance of the EMG. Rather than operate a buck-boost converter in Discontinuous Conduction Mode (DCM) in other impedance matching cases, the proposed method is running the boost topology in Boundary Conduction Mode (BCM). So it would perform …
-
Ultrasonic transducers for wideband attenuation measurements
… these frequencies. However, their high acoustic impedances relative to their liquid loads make them inherently narrowband and inefficient. To overcome these undesirable features, impedance matching techniques are used whereby the impedance mismatch between a transducer and its load is reduced. In …
-
Techniques for efficient radio frequency power conversion
… amplifier (PA) or inverter along with a tunable impedance matching network (TMN). Electronically-controlled TMNs offer substantial benefits when it comes to the implementability of such highly reconfigurable and adaptive RF systems as they allow for proper impedance termination of the PA or …
-
Modelling of low frequency muffler based on acoustic black hole effect
… These structures work on the principle of impedance matching, and in theory, have been realized to achieve total absorption of sound in closed terminating channels. This theoretical understanding, backed up with numerical analyses, has been reviewed to develop the concepts underlying this …
-
Analysis of Highly Coupled Wideband Antenna Arrays Using Scattering Parameter Network Models
… arrays as well as their radiation efficiency and impedance mismatch. Using the network model, the relationship between radiation pattern characteristics and the input impedance characteristics of the array antennas becomes clear. Three types of source impedance matching conditions for array …
-
Far field RF power extraction circuits and systems
… be derived. Next I devise circuit, antenna and impedance matching network design strategies to efficiently approach these theoretical bounds. Finally, I use these strategies to create an experimental power extraction system that collects RF power at low electromagnetic field strengths. This …
-
The Stub Loaded Helix: A Reduced Size Helical Antenna
… included the development of an appropriate impedance matching network for the SLH, which is also detailed.
-
Absorption-Dominant Electromagnetic Interference Shielding Polymer Composites and Foams
… EMI shielding CPCs and foams. An input impedance model was applied to explore the thickness dependency of reflectivity (R) in microcellular CPC foams and then decouple the effect of thickness on the R-value from other structural variables, such as the void fraction and cellular …
-
Design of Miniature Low-Cost Antennas for Compact Low-Data-Rate IoT Terminals
… electrically small regime, further complicating impedance matching. The aim of this thesis is to introduce a new design methodology that provides low-cost Electrically Small Antenna (ESA) solutions suitable for integration into commercial 2.4GHz IoT devices. Accordingly, two novel prototypes are …
Page 1 of 4