Q‐band to V‐band 1D and 2D elliptical lens antenna arrays

Yang, Lü; Domier, Calvin; Luhmann, N. C.

doi:10.1002/mop.22620

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…A 2-D antenna array can be used if 3-D images are desired. [7] Wideband baluns are employed to convert the downconverted ECEI signals from the balanced CPS lines to unbalanced transmission lines leading to end launch SMA connectors. This balun is also combined with the DC bias circuit to reduce the required LO power for the mixer array.…”

Section: A Mixer Arraymentioning

confidence: 99%

2-D Passive Millimeter Wave Imaging System for Plasma Diagnostics

Shen

Domier

Luhmann

et al. 2007

2007 Asia-Pacific Microwave Conference

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Technology advances have made possible the visualization of electron temperature profiles and fluctuations inside the core of high temperature plasmas via a twodimensional passive millimeter wave imaging system. The electron cyclotron emission imaging (ECEI) system concept and configuration are briefly described. Advanced technologies such as frequency selective surfaces band-stop filter, planar Schottky diode mixer arrays, wide bandwidth IF electronics, and imaging optics are presented.

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Section: A Mixer Arraymentioning

confidence: 99%

2-D Passive Millimeter Wave Imaging System for Plasma Diagnostics

Shen

Domier

Luhmann

et al. 2007

2007 Asia-Pacific Microwave Conference

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“…As a consequence operating frequencies are shifting towards the millimeter wave, mm-wave, regime. A number of mm-wave subsystems have utilized the integration of planar antennas positioned at the back of three-dimensional (3D) dielectric lenses [3]- [14]. The type of arrangement can yield highly directive pencil beam antenna patterns and a degree of compatibility for integration with monolithic circuits, as well as a simple means for multiple-beam formation.…”

Section: Introductionmentioning

confidence: 99%

“…Godi [13] investigated using the FDTD technique the chracteristics of electrically small extended hemispherical substrate lenses. Yang [14] designed a 3D elliptical lens fed by 1D and 2D arrays from 38 to 75 GHz for millimeter wave plasma radar reflectometric imaging.…”

Section: Introductionmentioning

confidence: 99%

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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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“…On the other hand, lens antennas made with dielectric materials with high dielectric constants are desirable to favour power transfer from the feed to the lens [13]. High-permittivity materials yield a more exact geometrical approximation to an elliptical lens and achieve a wider multiple-beam coverage range [14]. However, when dense materials are used as the lens material, multiple internal reflections are excited within the lens.…”

Section: Introductionmentioning

confidence: 99%

Effects of antireflective coatings on scanning performance of millimetre‐wave lenses

Sönmez¹,

Tokan²

2016

IET Microwaves, Antennas & Propagation

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This study examines the beam scanning performance of the antireflective coatings designed on millimetre‐wave integrated lens antennas with dense material. Dielectric lens antennas fabricated with a dense dielectric material allow good power transfer efficiency through the lens and enable fabrication of low‐cost and compact‐size lens antennas. However, using dense dielectric material causes strong multiple internal reflection behaviour inside the lens antenna. These multiple reflections deteriorate not only the return loss but also the radiation characteristics. Wide angle scanning performance is limited due to off‐axis aberrations. Effects of strong internal reflections can be reduced considerably using one or more dielectric matching layers coated at the top of the antenna. A 77 GHz extended hemispherical lens antenna made of alumina is coated with different types of solutions for antireflection layers, namely, conventional quarter‐wave transformer, multiple layer transformer, linear and circular corrugations and their performance in beam scanning applications is observed. The lens is illuminated by an aperture coupled microstrip antenna designed to radiate into alumina at 77 GHz. A frequency‐dependent characterisation of the beam pattern clearly showed the existence and impact of internal reflections on beam scanning performance for 77 GHz automotive radar antennas.

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Q‐band to V‐band 1D and 2D elliptical lens antenna arrays

Cited by 10 publications

References 11 publications

2-D Passive Millimeter Wave Imaging System for Plasma Diagnostics

2-D Passive Millimeter Wave Imaging System for Plasma Diagnostics

Patch Fed Planar Dielectric Slab Extended Hemi-Elliptical Lens Antenna

Effects of antireflective coatings on scanning performance of millimetre‐wave lenses

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