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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 26 for “"rectangular waveguide"”.
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Closely Spaced Transverse Slots in Rectangular Waveguide
Made available in DSpace on 2015-05-12T17:06:22Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0020866.PDF: 2951831 bytes, checksum: 10d14e12345c531031db51a2f0056116 (MD5) Previous issue date: 1957
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A study of multipacting in rectangular waveguide geometries
… was identified as being multipactor in the rectangular input coupler waveguide. Prior studies carried out by R.L. Geng at Cornell University identified a number of solutions which he proposed to verify experimentally. Two series of experiments were carried out at Cornell University on short …
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Rectangular waveguide narrow-wall longitudinal-aperture antenna arrays for high-power applications
This work deals with the design and bench test of rectangular waveguide narrow-wall longitudinal-aperture antenna arrays for high power applications. The best narrow-wall longitudinal-aperture array designs in the work are called the double-narrow-wall-slot-HPB-array and the …
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Rectangular Waveguide Filled with Uniaxial Medium and Negative Resistance Enhanced Composite Right/Left-Handed Transmission Line
… work. The first part addresses the problem of a rectangular waveguide filled with a uniaxially anisotropic or uniaxial medium. Different orientations of the optic axis of the uniaxial medium are considered and the wave transmission and modal behaviors are investigated. When the optic axis is …
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Shielded Metal Waveguides with Uniform Electric Field Distributions
… distributed electric field within a metal waveguide. A rectangular waveguide centrally loaded with a dielectric product is investigated rst since rectangular waveguides are widely used and can be easily made as exposure chambers and applicators. Then a dielectric slab loaded rectangular …
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S band narrow-wall slotted waveguide antenna For high-power applications
… seeks designs of novel antennas, such as the rectangular waveguide narrow-wall longitudinal-aperture antenna arrays for S band high power applications. This antenna is designed to perform as a uniform array with minimum power reflected into the feed-waveguide. Based on the configuration, the …
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Extracting material constitutive parameters from scattering parameters
… to model the materials in both free space and rectangular waveguide environments to calculate the S-parameters (S11 and S21) from which the constitutive parameters can be extracted.
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Tunable compact microwave multiplexers based on substrate integrated waveguide
… (HCFM) implemented using substrate integrated waveguide (SIW). Compared to conventional rectangular waveguide HCFM, the new design achieves 60% reduction in size. The feasibility of electronic tuning of the HCFM is also investigated using full wave electromagnetic (EM) simulations. The compact …
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Compact Leaky Wave Antenna Using Ferroelectric Materials
… PZT) with high dielectric constant (k) in a rectangular waveguide leaky wave antenna. Due to the high dielectric constant of PZT ~ 1,900, the propagation wavelength in the waveguide can be dramatically shortened. This allows the leaky wave antenna to be operated at much lower frequency, or to …
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Contributions towards a coherent chaotic oscillator at 100MHz and 70 GHz antennas for automotive radar applications.
… infinity probes and the second one uses a WR-12 rectangular waveguide to feed and test the operability of the antennas. The array is fabricated and tested in the lab to verify the simulated results.
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Dielectric Characterization: A 3D EM Simulation Approach
… geometry. The method is applied to an X-band rectangular waveguide setup, for which the theoretical S-parameters can be readily calculated. A Teflon sample, for which the dielectric properties are well-known, is used for all measurements and calculations. After presenting a detailed derivation …
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Development of waveguide filter structures for wireless and satellite communications
… of compact conventional and substrate integrated waveguide structures with improved performance taking advantage of recent cross-coupled resonator filters theory achievements such as the modular filter design approach using non-resonating nodes and inline extracted pole filters. Therefore, the …
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Design Of A Material Test Kit For Use From 1.6 Ghz To 26.5 Ghz And Its Use In Evaluation Of Dielectric Properties Of Foam Core Materials Used In Sandwich Composites
… the frequency range of 1.70 GHz to 26.5 GHz. The rectangular waveguide (RWG) is used for the measurement. Calibration kits have been designed for these waveguides. We have used the Agilent 85071E material measurement software to find the permittivity in terms of the measured S-parameters. A …
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A computational electromagnetic framework for waveguide quantum electrodynamics
In this thesis, a framework for cavity and waveguide quantum electrodynamic (CQED, and WQED, respectively) problems is presented. The essence of this framework is to use the dyadic Green's function (DGF) to obtain the local density of states (LDOS) and radiative shift of a two-level system (TLS) …
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Substrate Integrated Waveguide Horn Slot Antenna Array
Substrate integrated waveguide (SIW) is a rectangular dielectric-filled waveguide, which is synthesized in a planar substrate with arrays of metallic vias to realize bilateral side walls and its transitions with planar structures. These vias act as walls of the waveguide supporting current flow, …
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Design and Analysis of Corrugated Conical Horn Antennas with Terahertz Applications
… horn antennas. The main design stages were (1) a rectangular to circular transition from a WR rectangular waveguide to a circular waveguide input, (2) a circular smooth-walled to corrugated transition and (3) a transition from a small diameter corrugated waveguide to either a large diameter …
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Analysis of Aperture Radiation Using Computer Visualization and Image-Processing Techniques
… example is provided in the context of a rectangular microstrip patch antenna. A comparison is performed between the visualized data and the theory of operation for the microstrip patch in order to demonstrate that radiation mechanisms can be obtained visually. An additional analysis tool …
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EMI measurement and modeling techniques for complex electronic circuits and modules
… of an IC when illuminated with an open-ended rectangular waveguide probe, at K-band (18-26.5 GHz) and Ka-band (26.5-40 GHz) microwave frequencies.</p> <p>In the fourth paper, a method to predict radiated emissions from DC-DC converters with cables attached on the input side to a LISN and on …
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Nanophotonics for tailoring light-matter interaction/
… on the directional coupling between one-way waveguide and conventional two-waveguide, we propose a new type of optical circulators, which has the potential for simultaneous broadband operation and small device footprint. The third phenomenon is Stimulated Brillouin Scattering (SBS), where …
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