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A novel technique based on the Field Mapping Algorithm (FMA) is proposed to gauge reflector surface smoothness from near-field reflector measurements. The proposed method provides exact information of the antenna surface with much less computation time compared with other available techniques. A few examples are given to illustrate the advantages of the new surface-analysis technique.
A new technique is presented for highly accurate far-field patterns obtained from spherical measurements in the near field of electrically large antennas. The proposed technique is based on the Field Mapping Algorithm, which provides exact fields on any desired surface from near-field data measured over a planar, cylindrical, or spherical surface. This method makes it possible to calculate complete...
We propose an exact solution technique for lens and reflector shaping, which determines the surface geometry of a reflector or a lens excited by a single feed element based on the specified far field information. Otherwise stated, given a desired far field pattern over a specified solid angle range, a single-reflector/single-feed antenna system can be obtained analytically via a closed form, exact...
We propose an exact solution technique for reflector shaping, which determines the surface geometry of a reflector excited by a single feed element based on the specified far field information. Otherwise stated, given a desired far field pattern over a specified solid angle range, a single-reflector/single-feed antenna system can be obtained analytically via a closed form, exact solution. There is...
We introduce a novel Ka-band microwave imaging system operating at 35 GHz. Central to the performance of this system is a direct field inversion algorithm requiring only one minute of processing time per image slice cross section. The imaging system is a single-frequency transmission device, consisting of a stationary single Ka-band transmit horn antenna and a Ka-band open-ended waveguide receive...
We propose a unique microwave through-the-wall imaging technology for three-dimensional objects. The imaging technique is based on the Field Mapping Algorithm (FMA), which is a direct inversion method requiring neither optimization nor iterative procedures.
We propose a unique microwave through-the-wall imaging technology for three-dimensional objects. The imaging technique is based on the Field Mapping Algorithm (FMA), which is a single-frequency direct inversion method requiring neither optimization nor iterative procedures.
We introduce an efficient microwave imaging system for medical applications, especially suited for breast cancer detection. The imaging system consists of a fixed source for transmit on one end, and a scanning, receiving sensor on the other, with the target placed in between. The image of the internal organ/limb tissue under examination is then obtained across a three-dimensional region, based upon...
We propose a novel microwave imaging technique for biological tissue, both with and without bone support. The imaging technique is based on the Field Mapping Algorithm (FMA), which is a direct inversion method requiring neither optimization nor iterative procedures. Conventional microwave tomography is based on optimization strategies which require large modeling libraries for the generation of effective...
We present a fully automated reconfigurable beam antenna with adaptive nulling capabilities. This antenna takes the form of an S-band eight-element phased array equipped with a digital beamforming electronic network that provides for instantaneous beam reconfiguration as well as nulling. We have fabricated a complete antenna system which exhibits promising test results. Demonstrated hardware performance...
Medical imaging utilizing electromagnetic waves as probes has been studied for at least the past half century, and, despite its long gestation period, in recent years it has finally claimed its proper role as an emerging alternative to X-rays. These evolving electromagnetic techniques now embrace several varieties of bioinstrumentation, microwave thermography and microwave microscopy, radar imaging,...
We present exact solutions to problems of antenna holography based on planar, cylindrical, and spherical near-field data as processed by our novel Field Mapping Algorithm (FMA). On the basis of the FMA, full field distribution information in the source region is determined exactly, from two tangential field components over a planar, cylindrical, or spherical surface. Stated in so many words, all three...
Przedmiotem rozważań są zmiany, które nastąpiły w działalności
służb medycyny pracy w minionym półwieczu,
charakterystyka zadań higienistów i przyczyny wzrostu
znaczenia ich udziału w tej działalności oraz potrzeby przestrzegania
przez nich własnego kodeksu etycznego.
Uchwalenie przez ONZ w 1948 roku Powszechnej
Deklaracji Praw Człowieka spowodowało zmianę strategicznego
celu służb medycyny...
We introduce an efficient microwave imaging technique for medical applications, especially suited for breast cancer detection. The imaging system consists of a fixed source for transmit on one end, and a planar array of receiving sensors on the other, with the target placed in between. The image of the internal organ tissue under examination is thus obtained across a three-dimensional region, based...
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