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                            Library & Multimedia
 New concepts in front end design for receivers with large, multiband tuning ranges
NCJ Number
              305694

Author(s)
          S. M. Shajedul Hasan
Date Published

April 2009
Length
              285 pages
Annotation
              This dissertation presents new concepts in front-end design for radio receivers with large, multiband tuning ranges.
Abstract
              This dissertation presents new concepts in front-end design for radio receivers with large, multiband tuning ranges, which are required to support large bandwidths over very large tuning ranges, and antennas that are usually narrowband or that support multiple narrow bandwidths. The author describes an improved use of multiplexers to integrate antennas and receivers compared to traditional techniques, which are limited in their ability to handle simultaneous channels distributed over very large tuning ranges but are important for frequency-agile cognitive radio, surveillance, and other wideband or multiband monitoring applications. The dissertation presents the goal of achieving sensitivity and how to improve the bandwidth to the maximum possible consistent with that goal, it then discusses the procedure which was developed for designing antenna-multiplexer-preamplifier assemblies. The author demonstrates that this approach can significantly increase the usable bandwidth and number of bands that can be supported by a single, traditional antenna, verified through field experiments.
      
  
          Additional Details
Grant Number(s)
        2005-IJ-CX-K018


  
  
        
  Agencies
        NIJ-Sponsored


  
  
        
  Publication Type
        Thesis/Dissertation


  
  
        
  Award
        A Low-Cost All-Band/All-Mode Radio for Public Safety
    
  
  
Date Published: April 1, 2009
    
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