This paper shows the application of planar antenna arrays employing large bandwidths in the millimeter-wave and low terahertz frequency region. Considerations on the design of such array systems, i.e. the arrangement of the antenna elements and the image reconstruction process are presented. Measurement scenarios for security screening and nondestructive testing (NDT) are investigated.
This paper presents investigations on impact damages on carbon and glass fibre reinforced plastics with a synthetic aperture radar in the frequency range of the W-Band (75 to 110 GHz) and J-Band (220 to 325 GHz). It was possible to detect the high energy impacts in the carbon fibre samples due to their phase delay in both bands. With the glass fibre samples it was also possible to detect changes in magnitude besides the phase delay. The three dimensional image reconstruction also revealed the damages beneath the surface.
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