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 91 for “"Input impedance"”.
-
Input impedance of a slot-cylinder antenna
… thesis a mathematical analysis is made of the input impedance to a cylinder antenna with an axial slot. It is excited by a parallel-wire line connected across the center of the slot. This causes standing waves along the slot. The analysis is then based on an analogy between the slot and a …
-
The Input Impedance of a Rectangular Aperture Antenna
Made available in DSpace on 2014-12-04T21:02:27Z (GMT). No. of bitstreams: 1 0001556.pdf: 3032716 bytes, checksum: 858e74b7d4b888c40364303800f1145d (MD5) Previous issue date: 1949
-
Middle ear pressure gain and cochlear input impedance in the chinchilla
… pressure in the ear canal) and the cochlear input impedance (ratio of PV to the product of VS and area of the footplate) computed. Our measurements of middle ear pressure gain are similar to published data in the chinchilla at stimulus frequencies of 500 Hz to 3 kHz, but are different at …
-
On the accuracy of estimating input impedance of probe-fed air-substrate microstrip patch antennas using the theory of characteristic modes
… modes are developed to estimate the input impedance of air-substrate, coaxial probe-fed, microstrip patch antennas with arbitrarily shaped patches. Such an antenna with an L-shaped patch is fabricated and experimentally measured, and a case study performed comparing the accuracy of …
-
The Theoretical and Experimental Determination of The Input Impedance of a Small Loop of Electric Current Immersed in an Anisotropic Plasma
Made available in DSpace on 2014-12-08T22:24:03Z (GMT). No. of bitstreams: 1 6706601.pdf: 3786623 bytes, checksum: 8a40360105e38f5e24dde3da0172d3ae (MD5) Previous issue date: 1966
-
Design guidelines for inverter fed motor drives in distributed power system applications
… in distributed power system applications. The input impedance of the load subsystem is an important factor in designing and analyzing the performance and stability of a distributed power system. In this thesis, a typical three-phase inverter-fed ac motor drive is modeled, analyzed and the input …
-
An energy buffer for constant power loads
… in high quality lighting that is impervious to input fluctuations. Because CPLs exhibit a negative incremental input impedance, they pose stability concerns in DC and AC systems. This thesis presents a power converter for a constant power LED bulb that presents a favorable input impedance to the …
-
Detecting, locating and sizing leaks in gas-filled pipes using acoustical measurements
… be detected, located and sized by measuring the input impedance of the duct and then analytically solving an inverse problem. However, previously applied analytical methods break down when it comes to predicting smaller hole sizes. Results are presented which show that, by treating smaller holes …
-
Acoustic pulse reflectometry for the measurement of musical wind instruments
The bore profile and input impedance of a musical wind instrument provide valuable information about its acoustical properties. The time domain technique of acoustic pulse reflectometry can be used to measure the input impulse response of a tubular object, such as a wind instrument, from which both …
-
UHF RFID Antenna Impedance Matching Techniques
… transmit 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 …
-
Delta-gap port model for surface-volume-surface electric field integral equation
… current distribution and the frequency-dependent input impedance of a dipole antenna. Extracted input impedance values obtained with SVS-EFIE are compared against those in the classical EFIE as well as experimental values. Convergence analysis of the computed values of the input impedance with …
-
Stability Methods for Regulated Loads
… (CPLs) therefore exhibit a negative incremental input impedance and pose stability challenges when present in either dc or ac systems. This thesis presents CPL design techniques to mitigate these issues, as well as tools to determine in which applications CPL instabilities may occur. For …
-
INVESTIGATION OF SMALL ANTENNAS FOR PERSONAL HANDY PHONE USE
… Line Antenna (MTLA). It can provide a good impedance matching to 50Q at a very broad frequency band by selecting the total length of MTLA around 0.561. The input impedance and gain can be controlled by properly choosing the size of the respective part of the MTLA. Effects of a human body on …
-
ΜΕΛΕΤΗ ΟΡΘΟΓΩΝΙΚΩΝ ΚΑΙ ΤΡΙΓΩΝΙΚΩΝ ΜΙΚΡΟΤΑΙΝΙΑΚΩΝ ΚΕΡΑΙΩΝ
… TOTAL INTERNAL FIELD (UNDER THE PATCH) AND THE INPUT IMPEDANCE ARE GIVEN WITH THE AID OF AN ANGULARLY DEPENDED REFLECTION COEFFICIENT OFA TEM WAVE OBLIQUELLY INCIDEND OF THE EDGE OF THE PATCH. IN THESE EXPRESSIONS THE PRACTICAL FEED SYSTEM AS WELL AS THE FEED POINT HAVE BEEN TAKEN INTO ACCOUNT. …
-
Multifilar Hemispherical Helical Antennas
… that provide moderate gain, largely real input impedance and circular polarization when operating in the axial mode regime. A modified form of the helix, the spherical helix, has been shown to yield similar polarization and gain characteristics over a narrow bandwidth but a much larger …
-
Absorption-Dominant Electromagnetic Interference Shielding Polymer Composites and Foams
… of single-layer 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 a Low Noise Amplifier for Wireless Sensor Networks
… and structures. The LNA needs to have matched input impedance, and at the same time it should amplify the small amplitude input signal without adding too much noise and still have the minimal power consumption. It also needs a good interface with external filters for input and output matching …
-
Power Converter Design for Maximum Power Transfer and Battery Management for Vibration-Based Energy Harvesting on Commercial Railcars
… loaded with 2 . In order to maintain a constant input impedance, the duty cycle of the power converter must be fixed. Conversely, output regulation requires the duty cycle to change dynamically. Consequently, there is a tradeoff between extracting maximum power and prolonging the battery life …
-
Electromagnetic modeling of hot-wire detonators using analytical and numerical methods with comparison to experiment
… implemented in MatLAB and used to determine the input impedance of the detonator for a frequency range spanning DC to 9 GHz. This program can then quickly investigate similar hot-wire detonators by varying their parameters. The generic model of the detonator is also simulated using ICEPIC, a 3-D …
Page 1 of 5