A Bifocal Ellipsoidal Gregorian Reflector System for THz Imaging Applications

García‐Pino, A.; Llombart, Nuria; González-Valdés, Borja; Rubiños-López, Óscar

doi:10.1109/tap.2012.2207064

Cited by 37 publications

(25 citation statements)

References 15 publications

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“…1), both phase curves will be rotated in the XYplane around Z-axis. This process is also analogous to the one performed with reflectors [7], and results in a focal ring in the XY-plane containing Fi and F 2 .…”

Section: Bifocal Design Proceduresmentioning

confidence: 84%

Application of bifocal concept to dual reflectarray configurations for multi-beam satellite antennas in Ka-band

Martinez‐de‐Rioja

Encinar

Pino

et al. 2017

2017 11th European Conference on Antennas and Propagation (EUCAP)

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Abstract-This contribution describes the design of a multibeam dual reflectarray antenna for operation in transmission in . The bifocal design concept has been used to obtain an improved performance for the off-axis beams with respect to the single focused antenna. The required phase-shift distributions are initially obtained with the reflectarrays in parallel planes, and then adjusted to compensate the tilting of both reflectarrays in the final Cassegrain configuration. The simulated radiation patterns in the elevation and azimuth orthogonal planes have been calculated for the two beams generated by the focuses, and then the multi-beam performance of the antenna has been evaluated.Index Terms-dual reflectarray, multi-beam antenna, bifocal design, satellite communications, Ka-band.

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Section: Bifocal Design Proceduresmentioning

confidence: 84%

Application of bifocal concept to dual reflectarray configurations for multi-beam satellite antennas in Ka-band

Martinez‐de‐Rioja

Encinar

Pino

et al. 2017

2017 11th European Conference on Antennas and Propagation (EUCAP)

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“…1 shows the multireflector antenna system. The main reflector (a) and the subreflector (b) are shaped surfaces designed as a BEGRS [18]. The main reflector aperture is 60 cm and the offset height is 48 cm.…”

Section: B Radar Electronicsmentioning

confidence: 99%

“…The second movement is a slow tilting of the whole mirror structure up and down in order to make the ellipse to scan vertically to accomplish the 50 90 cm FoV in the target plane. The BEGRS has been adopted because it provides an enhanced FoV without significant degradation of the beam, which can be up to 50% larger than in the unshaped confocal configuration [18].…”

Section: B Radar Electronicsmentioning

confidence: 99%

“…• The point space is compressed throughout the vertical direction so as to compensate the differences in the granularity of the available points throughout the horizontal and vertical directions. These differences are caused by the scanning pattern [18]. • The alpha-hulls algorithm [39] is used to generate the external and internal surfaces based on the resulting externallayer and internal-layer 3-D point sets.…”

Section: Radar Image Formationmentioning

confidence: 99%

“…The designed imaging radar system is made up of a 300-GHz CW-LFM homodyne radar sensor [14] and a novel bifocal elliptical Gregorian reflector system (BEGRS) [18] for standoff detection at 8 m. The main contributions of the present design are as follows.…”

mentioning

confidence: 99%

See 2 more Smart Citations

3-D High-Resolution Imaging Radar at 300 GHz With Enhanced FoV

Grajal

Badolato

Rubio-Cidre

et al. 2015

IEEE Trans. Microwave Theory Techn.

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We have developed a 3-D high-resolution radar at 300 GHz with a cell resolution of 1 1.6 1.6 cm at a standoff distance of 8 m for security applications. The selection of an operating frequency of 300 GHz, a bandwidth of 27 GHz, and a field of view of 50 90 cm improves the through-clothes imaging of person-borne concealed objects. The radar's antenna design allows single-pixel imaging at a frame rate of two frames per second. A reduction in cost and power consumption and improvements in image quality are additional requirements taken into account in the design of this radar system.Index Terms-Continuous-wave linear-frequency modulation (CW-LFM), field of view (FoV), imaging radar, millimeter wave.

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An analytical simplified model to characterize focused aperture antennas

García‐Pino

2014

Int. J. Microw. Wireless Technol.

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This paper presents an analytical model to characterize the radiation pattern of focused aperture antennas. The model is based on the classic parabolic on pedestal distribution for amplitude, but in this work the focusing phase term is considered and applied in the Fresnel region. The model is useful for millimeter and submillimeter wave imaging radar systems that usually work in the Fresnel region of the antenna. Analytical closed expressions are developed to predict the available resolution (transversal beamwidth) and operating range (axial beamwidth) of such systems. The effects of the first- and second-order phase distributions on the aperture have also been also studied in order to show the scanning effect, the axial refocusing, and the astigmatic beam degradation.

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A Bifocal Ellipsoidal Gregorian Reflector System for THz Imaging Applications

Cited by 37 publications

References 15 publications

Application of bifocal concept to dual reflectarray configurations for multi-beam satellite antennas in Ka-band

Application of bifocal concept to dual reflectarray configurations for multi-beam satellite antennas in Ka-band

3-D High-Resolution Imaging Radar at 300 GHz With Enhanced FoV

An analytical simplified model to characterize focused aperture antennas

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