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 15 of 15 for “"Slot antennas"”.
-
Novel feeds for microstrip and slot antennas: Theory and experiment
Microstrip and slot antennas with novel feeds suitable for monolithic microwave integrated circuit (MMIC) applications are investigated both experimentally and theoretically, using the cavity model as well as a full-wave analysis. The input impedance of a microstrip antenna fed by an arbitrarily …
-
Analysis and design of planar slot antennas for RFID applications using characteristic mode theory
… Most systems in the UHF band make use of planar antennas with good radiation characteristics to achieve electromagnetic coupling between the tag and the reader. Thin form factor, placement-insensitivity, small size and good radiation characteristics are essential qualities of planar RFID tag …
-
Numerical Solution of Integral Equations of Dipole and Slot Antennas Including Active and Passive Loading
Made available in DSpace on 2014-12-08T22:24:39Z (GMT). No. of bitstreams: 1 7000949.pdf: 4918244 bytes, checksum: 153001ec47bc957b95fd7c8280967a54 (MD5) Previous issue date: 1969
-
Cavity-backed T-fed slot antenna
Cavity-backed slot antennas are experiencing a revival because of the ever-increasing need for low-profile and conformal antennas which have a low radar cross section out of their operating frequency bands. Like thin microstrip patch antennas, cavity-backed slot antennas typically have a narrow …
-
Technologies for Room-Temperature Mid-Infrared Photodetection using Graphene
… composed of differently-sized, graphene-loaded slot antennas. Here, the tight juxtaposition of sub-wavelength antennas allows broadband transfer and wavelength-sorting of incident mid-IR light into graphene patches with a theoretical efficiency of up to ∼ 58%. I develop a compact circuit model …
-
A frequency reconfigurable slot antenna with a conductive microfluidic switching mechanism
Reconfigurable antennas have the potential to provide functionality to radio systems which will make them more robust and allow for much more efficient use of the electromagnetic spectrum when combined with cognitive radio. High power applications, however, cannot benefit from the advances made in …
-
Impact of ground plane serrations on radiation and impedance characteristics of a slot antenna over a conductive back plane
… are necessary qualities for RFID and wearable antennas as well as those used in many other applications. An antenna can be made indifferent to the material on which it is placed by shielding it with a conductive back plane. Slot antennas and planar dipole antennas are common choices for thin, …
-
Bandwidth enhancement techniques for low-profile antennas: Theory and experiment
… for bandwidth enhancement for low-profile antennas. The first method involves the use of coupled resonators. In particular, two cavity-backed slot antennas are coupled through an aperture in a common wall. One cavity-backed slot antenna, of the coupled antenna system, is driven. This …
-
Design and characterisation of wideband antennas for microwave imaging applications
… for microwave imaging, namely corrugated u-slot antenna at 1.17-5.13 GHz with the reference of S11 less than -10 dB. Two corrugated u-slot antennas; namely antenna 1 and antenna 2 are placed on a mirror side of skull phantom to examine their ability to detect an object inside the skull. …
-
Application of metamaterial structures in the design, analysis and prototyping of planar : Antennas aplicación de estructuras metamateriales en el diseño, análisis y y prototipado de antenas planas
… the design, analysis and prototyping of planar antennas", we want to continue with the line of investigation of planar antennas where the Radiation Group from the Technical University of Madrid has broad experience. The experience acquired with the design and analysis of planar antennas in the …
-
S band narrow-wall slotted waveguide antenna For high-power applications
This work 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, …
-
Small, dual band, placement insensitive antennas
… choice for these labels - a dipole variant. The slot antenna, the effective inverse of the dipole, is shown to be an effective RFID antenna for environment-independent peel-and-stick applications. A miniaturization and multi-band design technique is shown for a placement insensitive RFID antenna. …
-
Técnicas de barrido electrónico por frecuencia con agrupaciones de antenas de banda milimétrica y submilimétrica
… The sweep of the wave front of this type of antennas is achieved changing its operating frequency. The document has been structures in four chapters. In the first chapter a customized study of the techniques and methods present in the scientific literature related with frequency scanning …
-
Investigation and design of 5G antennas for future smartphone applications
… handheld devices such as smartphones, 2×2 MIMO antennas are currently employed in 4G systems and it is expected to employ a larger number of elements for 5G mobile terminals. Placing multiple antennas in the limited space of a smartphone PCB poses a significant challenge. Therefore, a new design …
-
Simulation, Design and Implementation of Antenna for 5G and beyond Wave Communication. Simulation, Design, and Measurement of New and Compact Antennas for 5G and beyond and Investigation of Their Fundamental Characteristics
… efficiency (MIMO). In 4G systems, 2-Element MIMO antennas are already used, while 5G mobile terminals for smartphone hand-held devices are projected to use a bigger number of elements. The placement of many antennas in the restricted space of a smartphone PCB is one of the most critical …