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Showing 1 to 20 of 23 for “"Dielectric resonator"”.
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Dielectric Resonator Antennas : theory and design
Theoretical models for the analysis of Dielectric Resonator Antenna (DRA) are developed. There are no exact solutions to many of the problems in analytical form, therefore a strong focus on the physical interpretation of the numerical results is presented alongside theoretical models. I have used …
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Dielectric resonator in the presence of a lossy conductor
… the complex resonant frequency of a post dielectric resonator in the presence of a lossy conductor. A full field analysis is performed on an infinite dielectric rod from which the complex propagation constant and modal solutions are found. Using a single dominant mode (HEM<sub>ll</sub>), …
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The design and realisation of electronically tunable dielectric resonator microstrip filters
… filters employing yttrium iron garnet (YIG) resonators. An alternative solution to this problem is to utilise high-Q dielectric resonators (DRs) in-conjunction with an appropriate tuning mechanism to realise tunable filters. DRs can provide unloaded Q-factors comparable to waveguide …
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Gallium arsenide field effect transistors microstrip integrated circuit dielectric resonator oscillators
… Effect Transistor Microstrip Integrated Circuit Dielectric Resonator Oscillators (GaAs MESFET MIC DROs) - the different types, their design and their performance compared to other high Q factor (ie narrowband) microwave oscillators. The thesis has three major objectives. The first is to collate …
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Design and Analysis of a 80 GHz Hybrid CMOS Dielectric Resonator Oscillator
… hybrid CMOS oscillator based on a cylindrical dielectric resonator coupled directly to an on chip structure. Dielectric resonators (DR) are known for their high quality factor, low cost, and high temperature stability which makes them a desirable frequency selecting element in design for …
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DESIGN AND IMPLEMENTATION OF MICROSTRIP MONOPOLE AND DIELECTRIC RESONATOR ANTENNAS FOR ULTRA WIDEBAND APPLICATIONS
… introduced to widen the impedance bandwidth of dielectric resonator antennas (DRAs). DRA features compactness, low losses, and wideband antennas. Different compact UWB DRAs are investigated in this dissertation. The designed DRAs cover a wide range of frequency bands such as, 6.17-24GHz, …
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Design and Analysis of a Cylindrical Dielectric Resonator Antenna Array and Its Feed Network
… antenna that meets these requirements is the dielectric resonator antenna (DRA). In recent years there has been an abundance of research on the utilization of the DRA as a radiating element. However, its practical application - especially pertaining to DRA arrays - is still considered to be at …
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Design and optimization of dielectric resonator antenna arrays based on substrate integrated waveguide technology for millimeter-wave applications
… focuses on the design and optimization of dielectric resonator antenna (DRA) arrays based on substrate integrated waveguide (SIW) technology, which has been proven to be promising for MMW applications. The objectives include both the development of highly efficient computer aided design and …
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The Dielectric Tube Resonator-a Slow-Wave, Open Boundary, Dielectric Resonator for The Generation and Measurement of Millimeter and Submillimeter Wavelength Electromagnetic Radiation
Made available in DSpace on 2014-12-04T21:03:06Z (GMT). No. of bitstreams: 1 5902004.pdf: 11355962 bytes, checksum: 13141c1b532a2eb7b5eec65b12a1e0f6 (MD5) Previous issue date: 1959
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Compact microwave filter designs based on cavity resonators
Cavity resonators are widely used in microwave filters and multiplexers due to their high quality factor and high power handling capability. Compact designs of these filters are important for practical applications, as they are generally bulky. In this thesis, two types of compact microwave filter …
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Filtering antennas based on rectangular dielectric resonators
… compact filtering antennas using rectangular dielectric resonator antennas (DRAs). First, four designs of DRA to increase bandwidth have been proposed. Low dielectric constant posts are inserted in DRA in different orientations so that the effective dielectric constant can be readily lowered …
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Towards High-Performance Reflectarray Antennas: Phase Sensitivity Reduction for Wide Bandwidth
… cell. Thus, the focus shifted to a rectangular dielectric resonator unit cell, which offers more precise insights into resonance modes and their effects on antenna performance. A detailed analysis of the resonant modes within the dielectric resonator unit cells was conducted. By identifying and …
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Light-matter interaction in silicon nanophotonic structures
… reported. Successively, light propagation in dielectric resonator and waveguides has been addressed, in particular considering photon Local Density of States modifications and the possible Purcell enhancement effect.
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Computational Design of the Electrical and Mechanical Performance of Steerable MEMS Antennas
… were simulated on the G3 platform; a cylindrical dielectric resonator antenna (C-DRA) and a teardrop dielectric resonator antenna (Td-DRA). The three best antenna variations on the G3 platform were simulated to have maximum actuation</p> <p>angles ranging from 10 - 13° and have bandwidths of 3.62 …
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Effective modeling of advanced filters and multiplexing networks
… compensated Ku-band multiplexer and a high power dielectric resonator filter, both in-band response and out-of-band spurious mode behavior of channel filters are captured in the hybrid models. In the second modeling method, the entire filter is segmented and each junction is EM simulated. By only …
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Model and design of small compact dielectric resonator and printed antennas for wireless communications applications. Model and simulation of dialectric resonator (DR) and printed antennas for wireless applications; investigations of dual band and wideband responses including antenna radiation performance and antenna design optimization using parametric studies
Dielectric resonator antenna (DRA) technologies are applicable to a wide variety of mobile wireless communication systems. The principal energy loss mechanism for this type of antenna is the dielectric loss, and then using modern ceramic materials, this may be very low. These antennas are typically …
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Compact integrated designs of microwave filters and antennas with dual-polarization
… investigates the use of a material with a high dielectric constant (approximately 20) and low loss for integrated design of microwave filters and antennas. Two different filtering antenna designs in the 3.5 – 3.7 GHz frequency range are presented. A dual-mode waveguide filter is used in both …
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Integration of microwave and millimeter wave bandpass filters with antennas
… antenna and the coupling between the antenna and resonator of the filter, which effectively removes the transitions between the filter and antenna and improves the overall system performance. In this thesis, two different types of filter and antenna integrations are investigated. First, the …
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Design and analysis of reconfigurable MIMO antennas for next generation wireless communication systems
… method for inducing degenerated modes in dielectric resonator for MIMO operation. Based on the proposed method, a 700 MHz dual-mode MIMO dielectric resonator antenna for LTE femtocell base station is designed and tested. The maximum dimension of the proposed antenna is only 0.2λ0 while the …
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Study of nonlinear microwave properties of high-temperature superconducting film
… films was studied by comparing the results of a dielectric-resonator technique and a stripline-resonator technique. We have concluded that patterning process contributes to neither the low-power surface resistance nor the power dependence of the surface resistance. To understand the …
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