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Simulation of Conductive and Radiated Emission for Off and On-Board Radio Receivers According to CISPR 12 and 25.

Altair Engineering-Aseim Elfrgani, C. J. Reddy
Altair ProductDesign, Inc-Dipen Das
  • Technical Paper
  • 2020-01-1371
To be published on 2020-04-14 by SAE International in United States
Two of the most commonly exercised standards by Electromagnetic compatibility (EMC) automotive engineers are CISPR 12 and CISPR 25. Both are developed and established by EMC regulatory committee named as CISPR (International Special Committee on Radio Interference) which is a part of International Electrotechnical Commission (IEC). While CISPR 12 is imposed as a regulation to ensure uninterrupted communication for off-board radio receivers, CISPR 25 is often applied to ensure the quality of services of on-board receivers. Performing these tests becomes challenging until the vehicle is prototyped which may prolong the production time in case of failure or need for modification. However, conducting these tests in simulation environment can offer more time and cost-efficient way of analyzing the electromagnetic environment of automotive vehicles. In this paper, a computational approach is proposed in order to predict electromagnetic disturbance from on-board electronics/electrical systems using 3D computational electromagnetic (CEM) tool; Altair Feko. The presented study elaborates on radiated and conductive emission simulations performed for both vehicular and component/module level EMI testing according to CISPR 12 and 25. Simulation setup…
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On-Glass Antenna for Connected Vehicle Communications

Vitro SAB de CV-David Dai
  • Technical Paper
  • 2020-01-1370
To be published on 2020-04-14 by SAE International in United States
In this paper, a glass patch antenna for 5Hz Wi-Fi, Dedicated Short Range Communications (DSRC), vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications is presented. The proposed antenna is embedded into a laminated vehicle window glass (outer and inner layers) and using the inner layer glass and polyvinylbutyral (PVB) layer as antenna substrate. The ground plan of the patch antenna is a layer of silver screen printed onto inner surface of the inner glass. The patch antenna is feed by a coupled aperture on the ground plan, therefore, no hole is required on the glass. The antenna is conformal to the glass and can be hidden under the black paint around the perimeter of the window glass. The measured peak gain of the antenna is around 5 dBi and the antenna can be embedded into windshield, back window and side windows for a combined omnidirectional far field radiation pattern in terrestrial direction. Since the antenna is part of the window glass, not additional antenna packaging required. In addition the patch antenna can be embedded around the perimeter…
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Water Avoidance Design Strategy for Capacitive Exterior Handles

Ford Motor Company-Douglas Demori, Júlio Magalhães, Anderson Ferreira, Filipe Camargo, Bruno Freitas
Huf Hülsbeck & Fürst-Pedro Dias, Michel Turbiani
  • Technical Paper
  • 2019-36-0187
Published 2020-01-13 by SAE International in United States
Nowadays, capacitive handles are increasing their use in high-end commercial vehicles. This particular handle applies a technology that permits to unlock and even lock the vehicle without a key. As benefit for current life, the customer has the possibility to access and close the vehicles more efficiently and faster, just possessing the key in the pocket or any close compartment that the user is carrying, for example, bag, purse, backpack. Even though, the design of capacitive exterior handle must follow several design strategies to avoid nonfunctional in rainy climate. Water could work as a blocker for the sensor signal captured, special design strategies that must be taken in order to minimize that the liquid could ingress the handle and even be retained on the region that sensor is located. On this two-piece handle not only the parting line location, drain holes and a favorable drainage for liquids inside the handle must be designed, but also a control on the painting capacitance is hugely important for a successful project. Overall, to validate physically the design, test…
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SDR Interface for the NeXtRAD Multistatic Radar System

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_06
Published 2019-12-01 by SAE International in United States

NeXtRAD is a dual-band, dual-polarization, multistatic radar system under development at the University of Cape Town (UCT) in col lab oration with University College London (UCL). The primary mission of the system is to collect multistatic data of small radar cross-section maritime targets embedded in sea clutter.

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Determine Thermal Fatigue Requirements for PEPS Antenna Copper Wire over Vehicle Lifetime with Defined Reliability Requirements

GMTCI-Abhinav Jauhri
  • Technical Paper
  • 2019-28-2582
Published 2019-11-21 by SAE International in United States
Reliability states the degree to which the result of a measurement, calculation, or specification can be depended on to be accurate. And, tests according to GM specifications represents a minimum of 15 years of vehicle life time with defined Reliability and Confidence level.In this work, actual number of thermal cycles for Thermal Fatigue tests (Thermal Shock and Power Temperature Cycle) are calculated for Copper Wire whose Coffin Manson exponent is 5.Overstressing the PEPS Antenna under thermal fatigue requirement (defined number of thermal cycles based on Reliability and Confidence requirements) will lead to broken Copper wire which will result in component’s functional failure and thus impossible to continue reliability testing.The objective of this paper is to determine thermal fatigue requirements for Antenna’s Copper wire whose Coffin Manson exponent is 5. Testing with exact number of thermal cycles will reduce the validation failures owing to broken Copper wire and thus save incurred revalidation cost.The current study is limited to only adjusting the thermal fatigue requirements (Number of Thermal Cycles) for only specific E/E components having Copper wire…
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Compact Antenna Enables Communication Where Radios Fail

  • Magazine Article
  • TBMG-35157
Published 2019-09-01 by Tech Briefs Media Group in United States

A pocket-sized antenna was developed that could enable mobile communication in situations where conventional radios don’t work such as underwater, through the ground, and over very long distances through air. The device emits very low frequency (VLF) radiation with wavelengths of tens to hundreds of miles. These waves travel long distances beyond the horizon and can penetrate environments that would block radio waves with shorter wavelengths. While today’s most powerful VLF technology requires gigantic emitters, this antenna is only four inches tall, so it could potentially be used for tasks that demand high mobility including rescue and defense missions.

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Shape-Shifting Origami Could Help Antenna Systems Adapt On-the-Fly

Aerospace & Defense Technology: September 2019

  • Magazine Article
  • 19AERP09_05
Published 2019-09-01 by SAE International in United States

Conventional reconfigurable electrical and radio frequency (RF) structures commonly used in applications involving real-time reconfigurability in response to fast varying operational scenarios require specialized substrates or complex electrical circuits. Origami-based RF reconfigurable components and modules offer a solution with unique properties. First, they enable reconfigurability over continuous-state ranges (as opposed to discrete states). Second, they do not require specialized mechanical support for multilayer frequency-selective surface structures. Moreover, deployable origami-based RF structures can achieve large surface reconfigurability ratios from folded to unfolded states. Finally, these structures allow for independent control of multiple figures of merit: bandwidth, frequency of operation, and angle of incidence.

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Shape-Shifting Origami Could Help Antenna Systems Adapt On-the-Fly

  • Magazine Article
  • TBMG-35107
Published 2019-09-01 by Tech Briefs Media Group in United States

Conventional reconfigurable electrical and radio frequency (RF) structures commonly used in applications involving real-time reconfigurability in response to fast varying operational scenarios require specialized substrates or complex electrical circuits. Origami-based RF reconfigurable components and modules offer a solution with unique properties. First, they enable re-configurability over continuous-state ranges (as opposed to discrete states). Second, they do not require specialized mechanical support for multilayer frequency-selective surface structures. Moreover, deployable origami-based RF structures can achieve large surface re-configurability ratios from folded to unfolded states. Finally, these structures allow for independent control of multiple figures of merit: bandwidth, frequency of operation, and angle of incidence.

Multi- and Wide-Band Single-Feed Patch Antenna

  • Magazine Article
  • TBMG-35130
Published 2019-09-01 by Tech Briefs Media Group in United States

A novel patch antenna technology was developed that provides significant benefits to NASA satellite communication applications, offering a unique wide-band/multi-band operating capability. For other non-space applications, the antenna design also offers broadband capability with high gain for applications where signal strength and smaller antenna sizes are important. The technology was developed to design antennas for satellites where the target communication frequency is unknown or unassigned.

Antenna Near-Field Probe Station Scanner

  • Magazine Article
  • TBMG-35134
Published 2019-09-01 by Tech Briefs Media Group in United States

Antenna characterization techniques are often expensive and time-consuming. NASA’s Glenn Research Center developed a highly versatile and automated system to perform characterization of single or multiple small circuit antennas, printed on-wafer or on other substrates, by measuring the antenna’s near-field radiated power.