论文信息 - Passive Frequency Selective Surface Array as a Diffuser for Destroying Millimeter Wave Coherence

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

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 the S-parameters with a free-space MVNA, and measured the radiation patterns with a BWO in motorized setup.

[1] T. A. Metzler,et al. Analysis of a reflectarray antenna using microstrip patches of variable size , 1993 .

[2] D. Pozar,et al. Design of millimeter wave microstrip reflectarrays , 1997 .

[3] J. Encinar. Design of two-layer printed reflectarrays using patches of variable size , 2001 .

[4] Jahja I. Trisnadi. Speckle contrast reduction in laser projection displays , 2002, IS&T/SPIE Electronic Imaging.

[5] N. Misran,et al. Design optimisation of ring elements for broadband reflectarray antennas , 2003 .

[6] Arttu Luukanen,et al. Terahertz active direct detection imagers , 2004, SPIE Defense + Commercial Sensing.

[7] Jahja I. Trisnadi. Hadamard speckle contrast reduction. , 2004, Optics letters.

[8] Roger Vounckx,et al. Hadamard speckle reduction for millimeter wave imaging , 2006 .

[9] Clive Parini,et al. Equivalent circuit method for analysis and synthesis of frequency selective surfaces , 2006 .

[10] B. Nauwelaers,et al. Fast Modeling and Optimization of Active Millimeter Wave Imaging Systems , 2006, 2006 European Microwave Conference.

[11] M. Bozzi,et al. Design and Testing of Frequency-Selective Surfaces on Silicon Substrates for Submillimeter-Wave Applications , 2006, IEEE Transactions on Antennas and Propagation.

[12] R. Vounckx,et al. Grounded Frequency Selective Surfaces as W-band Quasi-Optical Filters for Active Millimeter Wave Imaging , 2007, 2007 Asia-Pacific Microwave Conference.