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"Antenna footprint indicates the shape and size of the area illuminated by the antenna on the ground surface or subsurface. For GPR it is important as it determines the cross-range resolution of the radar. In this paper we demontrate that an array antenna comprising a number of rolled-dipole elements can produce a variable footprint by activating certain elements and deactivating the others. In this way the size of the array's footprint can be adjusted to remain comparable with the cross section of various targets which in turn minimizes clutter and improving the GPR performance . This paper presents FDTD simulation results and preliminary experimental result of the proposed antenna."

"Very few people are aware of the significant negative impact that cluttering- a communication disorder which affects a person's ability to speak in a clear, concise and fluent manner- can have on one's life educationally, socially and vocationally. Although different from stuttering, it is often related to this more well-known disorder. This book treats cluttering as a serious communication disorder in its own right, providing an in-depth examination of the critical factors surrounding its assessment, treatment and research. Using evidence-based data as well as information regarding the assessment and treatment of cluttering within the field of speech-language pathology, the volume includes the latest research findings and work from leading worldwide cluttering experts. Current viewpoints regarding cluttering, along with substantiated evidence are provided. Research findings are presented regarding the nature and neurology of cluttering. A range of successful assessment and treatment methodologies are described in the context of disorders which may co-occur with cluttering, such as autism spectrum disorders, learning disabilities, Down Syndrome and stuttering. Future directions with regards to the definition, teaching and researching of cluttering are also addressed. Students, faculty members, researchers and clinicians in the field of speech pathology will find this book an essential and unique source of information on cluttering."