Sökning: "rectangular waveguide"
Visar resultat 16 - 20 av 22 avhandlingar innehållade orden rectangular waveguide.
16. Characterization of losses in ridge, groove and microstrip gap waveguides
Sammanfattning : The gap waveguide is a new technology that recently has been presented as an attractive candidate for applications at millimeter and sub millimeter waves. The waveguide is generated in the gap between a smooth upper metal plate and a ridge (or a groove) in a textured lower metal plate. LÄS MER
17. Compact RF Integration and Packaging Solutions Based on Metasurfaces for Millimeter-Wave Applications
Sammanfattning : The millimeter-wave frequency range has got a lot of attention over the past few years because it contains unused frequency spectrum resources that are suitable for delivering Gbit/s end-user access in areas with high user density. Due to the limited output power that the current RF active components can deliver in millimeter-wave frequencies, antennas with the features of low profile, high gain, high efficiency and low cost are needed to compensate free space path loss and increase the communication distance for the emerging high data rate wireless systems. LÄS MER
18. Advanced MEMS Technology for Terahertz Frequencies
Sammanfattning : With the development of terahertz (THz) technology, a variety of application demands are growing rapidly, such as high-rate communications, THz radars, environmental monitoring, medical imaging, and space exploration. However, the fabrication, integration, and packaging techniques for THz components and systems pose great challenges for a large-scale, cost-effective production. LÄS MER
19. Miniaturized Hard Waveguides in Multifunction Array Antennas
Sammanfattning : Recent advances in technologies of wireless communications systems have led to an increasing desire for several antennas performing diverse functions at different frequencies to be integrated into a common radiating aperture. This gives rise to the so-called multifunction antenna, which affords the saving of scarce premium real estate and can alleviate problems arising from excessive antenna protrusions in aspects such as aerodynamics, aesthetics, and stealth capability in military applications. LÄS MER
20. Tunable Nanomaterials and their Applications for Terahertz Devices : Carbon Nanotubes and Silver Nanowires
Sammanfattning : The interest in terahertz (THz) technologies is growing in academia and industry. The design of electronic components at THz frequencies is relevant to application areas such as telecommunication, radar, material spectroscopy, and medical imaging and diagnosis. LÄS MER