A beam-scanning dual-polarized fan-beam antenna suitable for Millimeter wavelengths

Hay, Stuart G.; Archer, J.W.; Timms, Greg; Smith, Stephanie

doi:10.1109/tap.2005.852298

Cited by 43 publications

(20 citation statements)

References 16 publications

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“…Using this approach, it was possible to cover a 2-D plane by scanning the beam from each antenna in one direction. 10,11 The two antennas were arranged in a T formation, with phase centers separated by approximately 277 mm. Because of the relatively close proximity of the antennas when the system is viewing targets at distances of five meters or greater, the system approximates a monostatic radar, and backscatter radar cross sections can be used in calculating the predicted returns from targets.…”

Section: Imager Design and Experimental Setupmentioning

confidence: 99%

Design and testing of an active 190-GHz millimeter-wave imager

Timms

2010

J. Electron. Imaging

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The design and testing of an active 190-GHz imaging system is presented. The system features two beam-scanning antennas, one of which transmits a vertical fan beam, and the other which receives a horizontal fan beam. By correlating the transmitted and received signals, an output is obtained that is proportional to the millimeter-wave reflectivity at the intersection of the two fan beams. Beam scanning is obtained by rotating a small subreflector within each antenna, allowing rapid scanning. The system has an angular resolution of 0.3 deg, a field of view of 14 × 14 deg, and operates at a standoff distance of 5 m.

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Section: Imager Design and Experimental Setupmentioning

confidence: 99%

Design and testing of an active 190-GHz millimeter-wave imager

Timms

2010

J. Electron. Imaging

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“…The planar lens slab has a thickness of mm, which according to (11), (16), and (17) in [23] yields for a DSW of this material operated in TM mode at 28.5 GHz.…”

Section: Planar Lens and Feed Designmentioning

confidence: 99%

“…For many applications, fan beam antennas which producing a main beam having a narrow beamwidth in one dimension and a wider beamwidth in the other (orthogonal) dimension are required, e.g., for 2D search radar system, [15], millimeter-wave imaging systems [16], and weight limited spaceborne systems, [17]- [19], or millimeter-wave high-speed indoor wireless communication systems [20]. The lens presented here offers a solution for these applications.…”

Section: Introductionmentioning

confidence: 99%

Patch Fed Planar Dielectric Slab Extended Hemi-Elliptical Lens Antenna

Xue

Fusco

2008

IEEE Trans. Antennas Propagat.

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We present the results of a parametric study devised to allow us to optimally design a patch fed planar dielectric slab waveguide extended hemi-elliptical lens antenna. The lens antenna, 1113 in the lens plane and 0 6 thick, constructed from polystyrene and weighing only 90 g is fabricated and characterized at 28.5 GHz for both single and multiple operating configurations. The lens when optimized for single beam operation achieves 18.5 dB measured gain (85% aperture efficiency), 40 and 4.1 half power beamwidth for E plane and H plane respectively and 10%impedance bandwidth for 10 dB return loss. While for optimized for multiple beam operation it is shown that the lens can accommodate up to 9 feeds and that beam symmetry can be maintained over a scan angle of 27 with a gain of 14.9 to 17.7 dB, and first side lobe levels of 11 to 7 dB respectively. Over the frequency range 26 to 30 GHz the lens maintains a worst case return loss of 10 dB and port to port feed isolation of better than 25 dB. Further it is shown that residual leaked energy from the structure is less than 48 dBm at 1 cm, thus making a low profile enclosure possible. We also show that by simultaneous excitation of two adjacent ports we can obtain difference patterns with null depths of up to 36 dB.

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“…The IF signals from the two receivers were cross-correlated and a voltage produced which was proportional to the magnitude of the reflected radiation at the intersection of the two fan beams. Using this approach, it is possible to cover a 2D-plane by scanning the beam from each antenna in one direction 8 .…”

Section: Imager Design and Experimental Setupmentioning

confidence: 99%

“…An alternative approach is to use two orthogonally oriented scanning fan-beam antennas 8 , each of which scans in one dimension. An image is built up by scanning both antennas so that the intersection of the two beams moves around a 2D-plane.…”

Section: Introductionmentioning

confidence: 99%

A 190GHz active millimeter-wave imager

et al. 2007

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The design and testing of a 190 GHz imaging system is presented. The system features two beam-scanning antennas; the first transmits a horizontal fan beam and the second receives a vertical fan beam. By correlating the signals from the antennas, an estimate of the millimeter-wave reflectivity at the intersection of the fan beams is obtained. Each fan beam is scanned by rotating a small subreflector within the antenna; this simple rotation motion allows rapid scanning. The system is portable, currently approximately 0.6m × 0.6m × 2m high; the key size constraint is imposed by the 450 mm aperture length of the antennas. The imager has an angular resolution of 0.25° and a field of view of 14° × 14°, resulting in a raw image of approximately 50 × 50 pixels. The raw image is processed using super-resolution techniques. Images will be presented which show the capability of the system to image metallic and ceramic objects beneath clothing. These images were obtained by illuminating the scene with signals from a frequency-doubled Gunn oscillator. While this paper focuses on active imaging, the system can also operate in passive mode with reduced sensitivity.

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A beam-scanning dual-polarized fan-beam antenna suitable for Millimeter wavelengths

Cited by 43 publications

References 16 publications

Design and testing of an active 190-GHz millimeter-wave imager

Design and testing of an active 190-GHz millimeter-wave imager

Patch Fed Planar Dielectric Slab Extended Hemi-Elliptical Lens Antenna

A 190GHz active millimeter-wave imager

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