Pattern prediction of extended hemispherical-lens/objective-lens antenna system at millimetre wavelengths

Wang, Dou; Zeng, Guoxun; Sun, Zhong Liang

doi:10.1049/ip-map:19981880

Cited by 12 publications

(4 citation statements)

References 2 publications

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“…Several groups have described simulated and experimental results for the parameters of the beam emerging from the lens, as a function of the (cylindrical) extension of the lens beyond hemispherical. [24][25][26] These results cover cases similar, though not identical, to the two lens designs mentioned above. However, most of this work has been concerned with the generation or detection of narrow-band emission.…”

Section: Introductionsupporting

confidence: 74%

The influence of substrate lens design in terahertz time-domain spectroscopy

Rudd

Mittleman

Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges

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We describe measurements of the angular radiation patterns from lens-coupled terahertz antennas fabricated on photoconductive substrates. These measurements were performed with a novel terahertz (THz) timedomain spectrometer in which the femtosecond optical pulses used to gate the emitter and receiver antennas were delivered by optical fiber. We used this system to perform a comparison between the two substrate-lens designs commonly used in THz time-domain spectrometers. We measured both E-plane and H-plane emission patterns for a 90°bow-tie antenna. By comparing these experimental results with simulations based on Fresnel-Kirchoff diffraction, we find that the choice of substrate-lens design is important in determining not only the directivity of the emitted beam but also the spectral bandwidth. These results emphasize the significance of this crucial component in the design of broadband THz spectrometers.

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Section: Introductionsupporting

confidence: 74%

The influence of substrate lens design in terahertz time-domain spectroscopy

Rudd

Mittleman

Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges

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“…For plane wave with incident angle θ i = −0.22 • , 0 • , 0.22 • , GO/PO is used to obtain field distribution in focal plane of the objective lens [21,22], as shown in Figure 2(a). In Figure 2(a), according to Rayleigh's criterion [16], the angular resolution of the objective lens is about 0.22 • .…”

Section: Design Of the Imaging Systemmentioning

confidence: 99%

Analysis of THZ Imaging System with a Refractive Small Lens Array by a Hybrid Numerical Method

Zhang

Dou

2011

Journal of Electromagnetic Waves and Applications

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In this paper, a hybrid numerical method, combining geometrical optics/physical optics (GO/PO) and finite-difference timedomain (FDTD), is adopted to design and analyze a THz imaging system, which is composed of an optimized objective lens and a refractive small lens array (SLA). The diffraction efficiency of small lens and the level of cross talk between the adjacent small lenses are calculated and analyzed. The performance of different sizes and materials of SLA are calculated and compared in detail. The hybrid numerical method is also been verified by the relative experimental results.

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“…Different lens configurations have been studied in literature: hemispherical, hyper/hypo-hemispherical and extended hemispherical lenses [5,8,9,11]. The extended hemispherical lens is the most versatile solution as it permits to synthesize the other types by varying the extension length.…”

Section: Introductionmentioning

confidence: 99%

Dielectric lens optimization for conical helix THz antennas

Nenzi¹,

Varlamava

Marzano

et al. 2014

2014 IEEE 64th Electronic Components and Technology Conference (ECTC)

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In this work the design and characteristics of an extended hemispherical dielectric lens applied to a non-planar antenna for the detection of THz radiation is presented. Antenna and lens behavior is numerically investigated in a large frequency range around the central frequency of 1 THz. Common printable materials widely characterized at THz range are used for the lens realization. Numerical results of the full-wave electromagnetic analysis of some proposed structures are reported and discussed. IntroductionIn last years the interest addressed to the THz region (the frequency range between 0.1 and 10 THz) has grown because of the congestion of the electromagnetic spectrum at lower frequencies and of the need for higher data rate in digital wireless communications [1,2]. Whereas the communication industry is the strongest driver in the exploitation of the THz range, spectroscopy applications [3] and non-destructive testing [4] are today's major applications for THz radiation.The successful utilization of THz technology is subject to the availability of compact, stable, room temperature and low cost sources and detectors. In particular, detectors with high sensitivity are required because of the very high attenuation of THz radiation in the atmosphere and because of the difficulty of producing high-power compact sources.The integrated circuit technology has been identified as the most promising to manufacture reliable and economical detectors for the THz region [5,6]. In particular, in [6] a prototype of 1kpixel THz camera fabricated in commercial 65nm CMOS process has been presented. The camera is feed by USB power, operates at room temperature and has a bandwidth going from 600 GHz to 1 THz. In order to enhance the coupling between its 1024 pixels focal plane array and the outer environment, a silicon lens is places above the camera.Most common materials used for the fabrication of dielectric lenses at THz region are high resistivity silicon and PTFE (Teflon). Usually, a single lens focuses the incident radiation onto a focal plane array. The approach adopting the high resistivity silicon is expensive, thus, low-loss polymers (as PTFE) should be preferred for low cost applications. In a recent work [7], 3D printable and injection moldable materials have been characterized at THz frequencies, as their attractive characteristics in terms of the reduction of lens cost and the possibility to apply wafer level process (3D printing or molding) to produce reproducible arrays of micro-lenses. This configuration contemplates a dielectric micro-lens over every single pixel (detector) constituting the focal plane array [8,9]. Dielectric lenses have been thoroughly studied for millimeter wave and sub-millimeter wave imaging systems to increase the gain of the planar antennas coupled to detectors (slot, bowtie, spiral, log-periodic, etc).

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Pattern prediction of extended hemispherical-lens/objective-lens antenna system at millimetre wavelengths

Cited by 12 publications

References 2 publications

The influence of substrate lens design in terahertz time-domain spectroscopy

The influence of substrate lens design in terahertz time-domain spectroscopy

Analysis of THZ Imaging System with a Refractive Small Lens Array by a Hybrid Numerical Method

Dielectric lens optimization for conical helix THz antennas

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