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 9 of 9 for “"pattern diversity"”.
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Developmental Basis of Wing Pattern Diversity in Heliconius Butterflies
… gene regulatory networks can lead to biological diversity. Heliconius butterfly wing patterns provide an excellent example of this diversity. In particular, the species H. melpomene and H. erato display wide variation in wing pattern across their ranges in Central and South America, but wherever …
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Hybridization and the genetics of wing colour-pattern diversity in Heliconius butterflies
Diversity is perhaps , the most outstanding feature of the living world. Traditionally, biological diversity was thought to arise mainly through de nova mutations that increase in frequency through natural selection or genetic drift. However, it is now recognized that hybridization between already …
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Ultrawideband and Multi-state Reconfigurable Antennas with Sum and Difference Radiation Patterns
Pattern diversity is a term used to describe the operation of several antenna elements working together to produce multiple different radiation patterns with the aim of improving the quality and reliability of a communications system. One useful implementation of pattern diversity considers sum and …
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Modelling and design of compact wideband and ultra-wideband antennas for wireless communications. Simulation and measurement of planer inverted F antennas (PIFAs) for contemporary mobile terminal applications, and investigations of frequency range and radiation performance of UWB antennas with design optimisation using parametric studies.
… The antennas exhibits broadside directional pattern. The performances such as return loss, radiation pattern and current distribution of the UWB antennas are extensively investigated and carried out. All the results have been demonstrated using simulation and experimentally whereby all …
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Adaptive Arrays and Diversity Antenna Configurations for Handheld Wireless Communication Terminals
… into the performance of adaptive beamforming and diversity combining using antenna arrays that can be mounted on handheld radios. Handheld arrays show great promise for improving the coverage, capacity, and power efficiency of wireless communication systems. Diversity experiments using a handheld …
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Adaptive antenna systems for mobile broadband communications
… systems. Through analysis of the propagation pattern and the channel structure, new techniques of uplink power control and downlink beamforming are derived to adapt to the rapid variation of the vector channel. The low variability of the channel subspace and the negligible distance between …
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Hiding in plain sight: unveiling cryptic diversity and patterns in bumble bees
… The distributions and the vibrant color patterns of nearly all species of bumble bees are well mapped and described. In addition, the natural history, colony structure and social behavior of bumble bees are well documented and a well-supported phylogeny of the ~250 species currently …
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Investigation and design of 5G antennas for future smartphone applications
… could improve the channel capacity, diversity function, and multiplexing gain of the smartphone antenna system which makes it suitable for 5G applications. Different types of new and compact diversity MIMO antennas with Patch, Slot, and Planar inverted F antenna (PIFA) resonators are …
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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
… smartphone antenna system's chan-nel capacity, diversity function, and multiplexing gain, making it appropriate for 5G applica-tions. For distinct prospective bands of the sub-6 GHz spectrum, such as 2.6, 3.6, and 5.8 GHz, different types of novel and compact diversity MIMO antennas using Patch, …