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The near field focusing capabilities for circularly rotating conventional monostatic arrays operating in the frequency band from 5 GHz to 15 GHz are studied. The impact of the inter-element spacing on the beam patterns and sidelobe structure of two different UWB arrays is investigated. The UWB beam pattern is also investigated for different inter-element spacing in the azimuthal direction. The influence...
In this paper, three different three-dimensional imaging modes, i.e., Circular Synthetic Aperture Radar (CSAR), Elevation-CSAR (E-CSAR) and Planar Circular Array, are investigated in order to compare their 3-D imaging capability in terms of spatial resolution, spectral efficiency and the region of support in the wavenumber domain. The signal spectra of the point spread function are formulated via...
The focusing capabilities for one dimensional (1D-CR MIMO) and two dimensional circularly rotating multiple input multiple output (2D-CR-MIMO) arrays in different media are investigated. Impact of the position of the focusing point on the beamwidth and sidelobe structure is investigated. Impact of the medium (dielectric permittivity and ohmic losses) on the focusing capabilities is studied. For focusing...
Details of the temporal and spectral study on the transmission and propagation of EM wave in a 3D-volume model for tunnel boring machine (TBM) environment using near-field power (NFP) approach are reported herewith. Typical TBM's common underground deposits (sand, silt, clay, limestone, granite) with different degrees of wetness (varying from 0% to 20%) are investigated using full-wave electromagnetic...
The affective neuroscience personality scales (ANPS) aims to measure brain affective systems with the help of seven subscales: PLAY, SEEK, CARE, FEAR, ANGER and SADNESS, along with a spirituality subscale. From an affective neuroscience perspective, personality is substantially related to constitutional and developmental strengths and weaknesses in these basic subcortical emotional systems shared...
The millimeter-wave passive radiometric imaging systems based on the single channel design are developed. The systems are intended for disclosure of dangerous objects concealed under persons' clothing in short distances and for passive visualization of remote targets. The low-noise compact receiver (noise factor 4.5dB for 90–100GHz) involving four stages was designed. Antenna systems based on aspheric...
The sub-terahertz passive radiometric imaging systems based on the single channel design are developed for disclosure of dangerous objects concealed under persons' clothing in short distances and for passive visualization of remote targets. Antenna systems, such as based on aspheric lens and on parabolic reflector, were adopted and refined for passive imaging application. Low-noise, compact receiver...
Development of millimeter and sub-millimeter wavelengths technologies is of great interest lately, especially for application in terahertz imaging due to bringing high resolution. In our paper we consider a tomography approach for obtaining 3-D imaging in frequency range from 100 GHz up to 325 GHz. We applied the method which we developed earlier for low frequency sub-surface tomography, for extremely...
Development of millimeter and sub-millimeter wavelengths technologies is one of the most promising research areas, especially for applications in so called terahertz imaging. In the paper we consider a tomography approach for obtaining 3-D imaging in frequency range from 100 GHz up to 325 GHz. We apply the modernized image reconstruction method, based on developed earlier, for low frequency, surface...
Development of millimeter and sub-millimeter wavelengths technologies is of great interest lately, especially for application in so called terahertz imaging. As a rule, two main approaches are used for this purpose based on employment of active and passive methods of visualization. In our paper we consider a tomography approach for obtaining 3-D imaging in frequency range from 100 GHz up to 325 GHz...
In this paper, the millimeter-wave radiation properties of actively and passively excited sinusoidal PCB strip and microstrip antennas are investigated. The main advantage of constructing PCB antennas is the reduction of antenna size comparing with the wire structures. The constructed antennas can be used as small-sized and frequency-sacnning antennas in millimeter wave radars.
An active radio frequency (RF) filter based on floating active inductor circuits is presented in this work. For demonstration purposes, a third-order Chebyshev lowpass filter with an LC ladder structure has been designed for GSM applications. The filter has a cutoff frequency of 900 MHz and 0.4 dB ripple, and is tunable between 890 MHz and 960 MHz, consumes 10.5 mW power, and occupies an area of 96...
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