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 20 of 67 for “"Dual-band"”.
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Small, dual band, placement insensitive antennas
… applications. A miniaturization and multi-band design technique is shown for a placement insensitive RFID antenna. With the significant advance in functionality over existing RFID antennas that is demonstrated by the antenna discussed in this dissertation, the purview of peel-and-stick RFID …
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Dual band dipole antenna with harmonic suppression capability
… decade. Wireless devices that operate in multiband frequencies, with smaller size, are now used by almost everyone. In this work, multiband dipole antenna with harmonic suppression capability has been designed. The dual-band dipole antenna has been vigorous, since it is simple, easy to be …
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Dual band monopole antenna with harmonic suppression capability
… profile applications. The use of GSM and the ISM band frequencies at the same time by different devices require multiple antenna to support more than two frequencies. Thus this states the requirement and demand for antenna with multiple frequencies of operation and capability. However different …
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Development of compact dual-band monopole antenna for LTE application
… frequencies of 2.1 GHz and 3.5 for LTE mid-bands and high-bands communication systems. The proposed mender line radiation element is miniaturized the antenna size of 20×13×1.6 mm3. The designed monopole patch antenna achieves S11 parameters below -25 dB with gain around 2.2 dBi. The VSWR is …
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ANALYSIS AND DESIGN OF BROADBAND AND DUAL BAND MICROSTRIP ANTENNAS
… limitation of this technology- the narrow bandwidth. While competing antenna elements such as dipoles, slots, and waveguide horns have operating bandwidth of 15-50%, the traditional microstrip patch element typically has an impedance bandwidth of only a few percent. For this reason much of …
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An Investigation of Dual-Band Fabry-Pérot Resonant Cavity Antennas
In this dissertation, we examine a dual-band version of the Fabry-Pérot resonant cavity antenna that uses a frequency selective surface (FSS) patch layer over a ground plane to form a composite artificial ground plane that replaces the single metal ground plane of the conventional structure. The …
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Dual-Band Power and Communication Antennas for Wireless Brain-Computer Interfaces
… with an external system with sufficient bandwidth in an unconstrained environment without data dropouts. A viable solution to solve these problems is to supply power to the BCI device via inductive coupling at the high-frequency (HF) band (13.5 MHz) and to have data communication at the …
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Antenna-coupled Tunnel Diodes For Dual-band Millimeter-wave/infrared F
… focal-plane array that responds to both wavebands are desirable from the viewpoint of overall size and weight. We have developed antenna-coupled sensors that respond simultaneously at 30 THz and at 94 GHz, utilizing electron-beam lithography. Slot-antenna designs were found to be particularly …
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Investigation of a Novel Dual Band Microstrip/Waveguide Hybrid Antenna Element
… of the microstrip antenna is its narrow bandwidth. Several modern applications like satellite communications, remote sensing and multi-function radar systems will find it useful if there is dual band antenna operating from a single aperture. Some applications require covering both …
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Low-power dual-band on-body antenna for wireless body sensor networks
… are proposed in the present thesishaving a dual-frequency operation at 2.45 GHz and 5.8 GHz. The proposed antennas are optimized to maximize the Signal-to-Noise-Ratio (SNR) and, hence, to minimize the BER and the Specific Absorption Rate (SAR) in the human tissues. In this thesis, a …
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Low Profile, Printed Circuit, Dual-Band, Dual-Polarized Antenna Elements and Arrays
Dual-band antenna elements that support dual-polarization provide ideal performance for applications including space-based platforms, multifunction radar, wireless communications, and personal electronic devices. In many communications and radar applications, a dual-band, dual-polarization antenna …
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Single-band and Dual-band Beam Switching Systems and Offset-fed Beam Scanning Reflectarray
… capability. Beam scanning capability and multi-band operation of the microstrip reflectarray have been main research topics in the reflectarray design. Narrow bandwidth of the reflectarray is the main obstacle for the various uses of the reflectarray. The wideband antenna element with a large …
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Analysis and test of patch antennas for applications in dual-band and diversity systems
… a study of patch antennas for applications in dual-band and diversity systems is presented. The dual-band capability is achieved with two patches that are stacked vertically and coupled by an aperture in the lower patch. The aperture provides a convenient way of adjusting the separation between …
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Estimating forest attributes using laser scanning data and dual-band, single-pass interferometric aperture radar to improve forest management
… airborne laser scanning (lidar) data or dual-band, single-pass interferometric synthetic aperture radar data (from GeoSAR) alone or both in combination (Chapter 4). In situ measurements of LAI, mean height, height to live crown, and stem density were made on 109 (LAI) or 110 plots (all …
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Multi-Layered Dual-Band Dual-Polarized Reflectarray Design Toward Rim-Located Reconfigurabable Reflectarrays for Interference Mitigation in Reflector Antennas
… interference in the important L- and X-band frequencies which are crucial for astronomical observations. This thesis introduces reflectarray design which can serve as a basis for an interference mitigation solution for radio telescopes. In the envisioned application, When the …
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Digital predistortion of RF amplifiers using baseband injection for mobile broadband communications
… is extended to be applicable in concurrent dual-band wireless transmitters. A cross-modulation problem specific to concurrent dual-band transmitters is investigated in detail and novel DPD based on simultaneous injection of intermodulation and cross-modulation distortion products is …
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Investigation into the design of ultra-wideband (UWB) and multi-band antennas
… demands on spectrums for which ultra-wideband (UWB) and multi-band, e.g.: dual-band, techniques are useful. These UWB and multi-band services require UWB and multi-band antenna designs. Motivated by these applications, we first carried out the investigations on the family of square plate …
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Balanced antennas for mobile handset applications. Simulation and Measurement of Balanced Antennas for Mobile Handsets, investigating Specific Absorption Rate when operated near the human body, and a Coplanar Waveguide alternative to the Balanced Feed.
… MHz and 5000 ¿ 5800 MHz) and UWB frequency bands. Various antennas are implemented based on built-in planar dipole with a folded arm structure. The performance of several designed antennas in terms of input return loss, radiation patterns, radiation efficiency and power gain are presented …
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Compact microwave filter designs based on cavity resonators
… irises of a dielectric resonator filter (DRF), a dual-band filter can be achieved. Metal posts, which can be realized using screws, are applied in the irises of dielectric resonator filters working as capacitive obstacles. These posts along with the irises and dielectric resonator enclosure, which …
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Practical realisation of multiband planar filters on multilayer substrates
… specified essential requirements such as multi-band operation, compact size, and without significant deteriorated filter performance in comparison with single-band filters. The focus is placed on new synthesis and design procedures for multiband responses. In some cases, the possibility to …
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