STW project "Advanced relocatable multisensor system for buried landmine detection"

Ligthart, L.P.; Yarovoy, Alexander

doi:10.1109/agpr.2003.1207284

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…Tuning capability to generate pulse signals of different durations is another desired function of pulse generator. Tunable pulse has both advantage of increased penetration (or range) and fine range resolution, and is attractive for UWB systems [1][2][3]. It can also be exploited to compensate for variations caused by used CMOS process.…”

Section: Introductionmentioning

confidence: 99%

Fully integrated CMOS impulse UWB transmitter front-ends with BPSK modulation

Miao

Nguyen

2010

Microw. Opt. Technol. Lett.

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We present the development of a miniaturized broadband Wilkinson power divider on a multilayer organic substrate with integrated thin film resistors. The VSWR for all port for both dividers is better than 1.6:1, the excess insertion loss is less than 1.6 dB up to 18 GHz, and 12 dB of isolation is realized. A size reduction of 43% is achieved. The proposed divider has the widest bandwidth ratio, 9:1, and the most compact size, 9.3 mm by 6 mm. In previous work, researchers have fabricated Wilkinson power dividers on liquid crystal polymer (LCP) with integrated resistors operating in the V-band and the W-band [5], with bandwidth ratios of 1.6:1 and 1.5:1, respectively. Their designs are compact and broadband simply because the fractional bandwidth is higher at higher operating frequencies. Many applications, such as UWB (3.1-10.6 GHz), require a wide bandwidth at lower operating frequencies. Wide bandwidth Wilkinson power combiners/dividers can be realized by cascading multiple sections, which can lead to large sizes. A folded Wilkinson power divider proposed in [6] was implemented on a GaAs substrate with a bandwidth ratio of 3:1, from 15 to 45 GHz.In this article, we report a folded compact Wilkinson divider (see Fig. 1) that achieves a measured VSWR of better than 1.6:1 with a bandwidth ratio of 9:1 and a size reduction of 43%. This is the most compact Wilkinson divider with the highest bandwidth ratio to date. The Wilkinson power divider is implemented on a multilayer LCP substrate. DESIGN CONSIDERATIONSIn this article, a multiple cascading stage technique [4] is used to enhance the bandwidth. A binomial multisection matching transformer is used to ensure a maximally flat passband. An odd-mode and even-mode half circuit is the conventional model used for analysis. In the odd mode, the half circuit is essentially a multisection quarter-wavelength impedance transformer. In this case, a binomial matching transformer is used, defined by the function [7] where C is the reflection coefficient, N is the number of cascaded sections, andUsing the binomial expansion on [1] and equating it to the reflection coefficients derived from the small reflections approximations, one is left with the following results to derive for the impedance of each quarter-wavelength section.where the binomial coefficient is defined asCascading of quarter wavelength sections can increase the bandwidth dramatically and a seven-stage Wilkinson was chosen for our design. CIRCUIT DESIGNIn the frequency band of 2-18 GHz, the length of a quarter wavelength transmission line at the center frequency of 10 GHz is 30 mm. We have used both the folding and circular [8] section techniques to miniaturize the Wilkinson divider. As shown in Figure 1, four circular sections of quarter wavelength transmission lines are printed on top of the LCP substrate and the other three sections on the bottom side. A metal sheet is inserted in the center of the LCP board to provide a ground plane for the top and bottom circular sections. We used Ansoft's high ...

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Section: Introductionmentioning

confidence: 99%

Fully integrated CMOS impulse UWB transmitter front-ends with BPSK modulation

Miao

Nguyen

2010

Microw. Opt. Technol. Lett.

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“…Duzdar and Kompa have also introduced a pulse radar sensor with a bandwidth of 6 GHz, which can be implemented at low cost and is used in high-resolution applications [42]. Yarovoy et al have developed a 3 GHz ground-penetrating impulse radar and demonstrated its ability to detect small, shallow buried objects [43,44]. Lee has also developed a pulse radar system for underground penetration radar applications and showed the potential of its application to pavement evaluation [45].…”

Section: Background and Current Statusmentioning

confidence: 99%

Design and Implementation of a UWB Radar Sensor for Non-Destructive Application

Ahajjam¹

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“…A light-weight FMCW GPR for the detection of hazardous waste containers and unexploded ordnance was realized with a dynamic range of 96dB and a bandwidth of 500MHz (from 200 MHz to 700MHz) [6]. A SFCW system for detecting buried landmines is reported with a system dynamic range of 82 dB and a bandwidth of 4.445GHz (from 400MHz to 4845 MHz) [7]. Another SFCW GPR for detecting buried objects has a dynamic range of 90 dB and bandwidth is 290MHz (from 490MHz to 780MHz) [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of GPR Configurations by Ray-Tracing Methods

Shan

Pennock

Redfern

2006 IEEE Conference on Radar

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Methods for locating and identifying buried assets are one focus of a large research project entitled 'Mapping the Underworld'. As of part of the project we are studying novel configurations for ground penetrating radar (GPR). There are two of important specifications for the GPR configurations: the bandwidth and the dynamic range. In this paper, the bandwidth and dynamic range of a GPR are investigated through simulations. Media that are typical of street environments were modeled is used in the simulations. A 2D ray-tracing model is used to simulate propagation in the ground to identify signal levels, bandwidths and dynamic ranges. A novel In-Pipe deployment and a conventional deployment scheme for GPR are examined using ray-tracing. Comparison of the results shows that the In-Pipe deployment scheme for the GPR has immediate advantages over the conventional one, in terms of having a wider available bandwidth and therefore resolution, and in having a lower dynamic range requirement.

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STW project "Advanced relocatable multisensor system for buried landmine detection"

Cited by 7 publications

References 4 publications

Fully integrated CMOS impulse UWB transmitter front-ends with BPSK modulation

Fully integrated CMOS impulse UWB transmitter front-ends with BPSK modulation

Design and Implementation of a UWB Radar Sensor for Non-Destructive Application

Investigation of GPR Configurations by Ray-Tracing Methods

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