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.
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Showing 1 to 12 of 12 for “"Frequency Reconfigurable"”.
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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 …
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A frequency reconfigurable circularly polarized microstrip patch antenna using liquid metal microswitches
Reconfigurable antennas with adaptable frequency, pattern, and polarization offer flexibility and size reduction for wireless systems that must increasingly execute multiple missions with less volume. These antennas will also complement anticipated cognitive radio systems, which promise more …
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Design and analysis of a frequency reconfigurable antenna for wireless communication at 5 GHz
… AT AUTHOR'S REQUEST.] In this research, a frequency reconfigurable antenna was simulated and analyzed. The industry standard simulation suits (CST) was used in the design and analysis of the frequency reconfigurable structures. The proposed antenna uses four PIN diodes as connectors between …
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Design and analysis of an electrically small inductively loaded sector antenna for frequency reconfiguration using varactor diodes
… an inductively loaded, electrically small, frequency reconfigurable, sector antenna that covers most consumer frequency bands has been developed. This thesis details the design and characterization of the antenna element, which tunes the GSM 900, GSM 1800, 3G, WiFi, and WiMAX bands. The …
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Negative-group-delay and Non-foster Electromagnetic Structures
… applications is introduced, a frequency-reconfigurable antenna is presented which provides an excellent compromise among size, frequency tuning range and count of tuning elements. In Chapters 5, a design procedure for replacing the tuning element with a circuit, generating a …
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Controlling coupling in an electrically steerable parasitic array
… antenna arrays, each scaled for a different frequency band. This often results in large, cluttered, complicated designs. To accommodate multi-band operation the radiators can be loaded with reactive elements. To preserve the array properties across bands, a means to control the coupling …
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Ultrawideband and Multi-state Reconfigurable Antennas with Sum and Difference Radiation Patterns
… diversity antenna designs. Ultrawideband and frequency reconfigurable designs of pattern diversity antennas are desirable to help reduce the cost and increase the flexibility in applications of pattern diversity antennas. These two types of performances constitute the principal parts of this …
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Design and analysis of reconfigurable MIMO antennas for next generation wireless communication systems
… resolved effectively. Given the lower operating frequency of the new systems as compared to the WiFi and the existing cellular standards, the antennas in portable devices must be electrically small and are likely to be inefficient. It is also impractical to separate antennas to get low mutual …
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Energy storage in reconfigurable antennas
Despite their potential performance advantages, reconfigurable antennas have seen limited use in mobile devices. These complicated antennas can be challenging to design, especially when the structure is electrically small or mid-sized. With small elements, finite groundplanes, and switches or …
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Development of conformal reconfigurable metamaterial-based antennas
… has been a wide demand for novel flexible and reconfigurable wireless devices as a result of the rising user applications. This thesis presents the design of flexible low-cost antennas using metamaterial loadings with performance characteristics that can be reconfigured by employing …
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Bioinspired microvascular self-healing in polymers and composites
… substitution within the network. A prototype, frequency-reconfigurable antenna is fabricated to demonstrate newfound electromagnetic capabilities. VaSC is also employed to create 3D, isolated and interpenetrating microvascular networks in woven fiber-composite laminates to compare in situ …