Implementation of dynamic Hadamard diffuser as a frequency selective surface for W-band active millimeter wave imaging

2009 ◽  
Vol 51 (6) ◽  
pp. 1440-1445 ◽  
Author(s):  
Saiful Islam ◽  
Johan Stiens ◽  
Irina Jaeger ◽  
Gert Poesen ◽  
Roger Vounckx
Keyword(s):  
Millimeter Wave ◽  
Frequency Selective Surface ◽  
Millimeter Wave Imaging ◽  
W Band ◽  
Wave Imaging ◽  
Frequency Selective

scholarly journals Passive Frequency Selective Surface Array as a Diffuser for Destroying Millimeter Wave Coherence

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Saiful Islam ◽  
Johan Stiens ◽  
Gert Poesen ◽  
Irina Jaeger ◽  
Roger Vounckx
Keyword(s):  
Millimeter Wave ◽  
Random Phase ◽  
Frequency Selective Surface ◽  
Critical Parameters ◽  
Etching Technique ◽  
Millimeter Wave Imaging ◽  
Deterministic Function ◽  
Wave Imaging ◽  
Finite Integral ◽  
Frequency Selective

This paper presents the design, construction, and testing of grounded frequency selective surface (FSS) array as a diffuser for destroying millimeter wave coherence which is used to eliminate speckle in active millimeter wave imaging. To create stochastically independent illumination patterns, we proposed a diffuser based on random-phase distributions obtained by changing the incident frequency. The random-phase diffuser was obtained by mixing up the phase relations between the cells of a deterministic function (e.g., beam splitter). The slot length of FSS is the main design parameter used to optimize the phase shifting properties of the array. The critical parameters of the diffuser array design, such as phase relation with slot lengths, losses, and bandwidth, are discussed. We designed the FSS arrays with finite integral technique (FIT), fabricated by etching technique, and characterized theS-parameters with a free-space MVNA, and measured the radiation patterns with a BWO in motorized setup.

Single-Chip W-band SiGe HBT Transceivers and Receivers for Doppler Radar and Millimeter-Wave Imaging

2008 ◽  
Vol 43 (10) ◽  
pp. 2206-2217 ◽  
Author(s):  
Sean T. Nicolson ◽  
Pascal Chevalier ◽  
Bernard Sautreuil ◽  
Sorin P. Voinigescu
Keyword(s):  
Millimeter Wave ◽  
Doppler Radar ◽  
Single Chip ◽  
Sige Hbt ◽  
Millimeter Wave Imaging ◽  
W Band ◽  
Wave Imaging
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