Development of 77 GHz Radar Lens Antennas for Automotive Applications Based on Given Requirements

Binzer, T.; Klar, Michael; Gross, V.

doi:10.1109/inica.2007.4353963

Cited by 33 publications

(9 citation statements)

References 2 publications

(2 reference statements)

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“…Since the costs of the RF substrate forms a significant part of modern mm-wave radar systems the concept uses optical beamforming with a dielectric cylindrical lens to avoid large planar patch antenna arrays. Due to the short wavelength in the frequency band, lens antennas achieve a good performance combined with a small dimension and weight at high cost efficiency [8]. Since the Fresnel numbers are low at 77 GHz, the lens-based beamforming is dominated by diffraction and in the far-field region a Fraunhofer diffraction pattern can be observed [9].…”

Section: I S Y S T E M C O N C E P Tmentioning

confidence: 99%

Lens-based 77 GHZ MIMO radar for angular estimation in multitarget environments

Lutz

Walter

Weigel

2014

Int. J. Microw. Wireless Technol.

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The demanding tasks for automotive radar systems in multitarget scenarios require an increased target separation performance and new sensor concepts. In this contribution, a highly integrated 77 GHz time domain multiplex (TDM) MIMO radar is presented. The sensor is feasible for advanced direction of arrival (DOA) estimation in azimuth and elevation. For efficient and high-quality measurements a fractional-n phased locked loop (PLL) with integrated waveform generator, enabling chirp and frequency modulated continous waveform (FMCW) modulations, is implemented. Spatial beamforming is done with series feed array patch antennas in combination with a dielectric cylindrical lens. For the improvement of the direction of arrival (DOA) estimation performance a new lens-based MIMO radar approach is introduced. Therefore the classical MIMO approach is combined with the advantages of an optical beamforming concept. Due to the usage of these techniques the sensor performance in accuracy, ambiguity suppression, and angular resolution can be significantly increased.

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Section: I S Y S T E M C O N C E P Tmentioning

confidence: 99%

Lens-based 77 GHZ MIMO radar for angular estimation in multitarget environments

Lutz

Walter

Weigel

2014

Int. J. Microw. Wireless Technol.

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“…This lens material roughly corresponds to the maximum refractive index available in commonly used optical glasses [42]. For the refractive lens, we also select a 55 mm lens and aperture diameter to make the diameter similar to the diameter of many of the dielectric lenses used in millimeter-wave automotive radar systems designed to operate at 76.5 GHz [28]. To go along with the 55 mm lens diameter, we choose a 275 mm target focal length to yield an F-number of 5.…”

Section: F/5 Lens Designmentioning

confidence: 99%

“…For instance, 76.5 GHz automotive radar systems are used for collision avoidance and adaptive cruise control [27]. In several of these systems [24,28], a dielectric lens antenna with a small F-number (ratio of focal length to aperture) is used as a simple beam-forming device. To offer a challenge to the ubiquity of conventional, refractive dielectric lenses, GRIN lenses must offer a significant advantage that will offset their complexity and possibly higher cost.…”

Section: Introductionmentioning

confidence: 99%

Quantitative comparison of gradient index and refractive lenses

et al. 2012

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We analyze the Seidel wavefront aberrations and spot sizes of gradient index (GRIN) singlet lenses with Δn≈1. We consider and compare curved and planar GRIN lenses with F-numbers of 5 and 1 against equivalent refractive lenses. We find that the planar GRIN lenses generally have larger spot sizes compared to their refractive lens equivalents at wide angles. This appears to be due to an inability to correct for coma by adjusting the refractive index gradient alone. We can correct for the coma by bending the GRIN lens. This results in a singlet lens with performance close to but not exceeding that of the equivalent refractive lens. We also examine the impact of anisotropy on the planar GRIN lenses. We find that fabricating the planar GRIN lenses from a uniaxial medium has the potential to improve the performance of the lenses.

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“…M ILLIMETER-WAVE lens antennas have been presented in several publications [1]- [4]. Possible applications include radar sensors at 77 GHz and point-to-point communication at 60 GHz or thereabout.…”

Section: Introductionmentioning

confidence: 99%

Low-Profile 77-GHz Lens Antenna With Array Feeder

Hallbjörner

Bruce

et al. 2012

Antennas Wirel. Propag. Lett.

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A 77-GHz lens antenna for automotive radar applications is presented. It consists of a feeder in the form of a 2 2 patch array etched from a single layer on a 100-m-thick substrate and a commercially available dielectric lens. Compared to previously published lens antennas, the presented design has the advantages of excellent electrical performance and a low profile in combination with a thin lens. Measurements of port impedance match and radiation patterns are presented. Beam tilt by lateral offset of the lens is demonstrated experimentally.

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Development of 77 GHz Radar Lens Antennas for Automotive Applications Based on Given Requirements

Cited by 33 publications

References 2 publications

Lens-based 77 GHZ MIMO radar for angular estimation in multitarget environments

Lens-based 77 GHZ MIMO radar for angular estimation in multitarget environments

Quantitative comparison of gradient index and refractive lenses

Low-Profile 77-GHz Lens Antenna With Array Feeder

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