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Acconeer A111 Скачать руководство пользователя страница 7

Hardware and physical integration guideline PCR Sensor A111

Page 7 of 32

2022-03-08

© 2022 by Acconeer

– All rights reserved

Figure 4. An example of how to connect a power switch to reduce the leakage current when A111 is powered off.

2.2 SPI Interface

To optimize signal integrity of the SPI bus, it is recommended to route the SPI bus with as short as
possible trace lengths with an adjacent ground plane.

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Содержание A111

Страница 1: ...Hardware and physical integration guideline PCR Sensor A111 User Guide...

Страница 2: ...integration guideline PCR Sensor A111 Page 2 of 32 2022 by Acconeer All rights reserved 2022 03 08 Hardware and physical integration guideline PCR Sensor A111 User Guide Author Acconeer Version 1 5 2...

Страница 3: ...t 8 3 1 Sensor ground plane size 8 3 2 Impact of PCB routing and nearby components 8 3 3 Impact of conformal coating 10 3 4 Sensor underfill 11 4 Physical Integration 12 4 1 Radome integration 12 4 2...

Страница 4: ...pectively 1 1 Radar loop equation Consider a signal transmitted through free space to a radar target located at distance R from the radar Assume there are no obstructions between the radar and the rad...

Страница 5: ...field distance from the sensor 1 m The far field distance can be determined by the aperture of the sensor and the radar target farfield 2 2 2 where A is the largest dimension of either the sensor or t...

Страница 6: ...low leakage power switch in between the two 1 8 V domains In both cases a control signal PMU_ENABLE is needed See Figure 3 for details Figure 3 Block diagram of how to connect a Power Management Unit...

Страница 7: ...All rights reserved Figure 4 An example of how to connect a power switch to reduce the leakage current when A111 is powered off 2 2 SPI Interface To optimize signal integrity of the SPI bus it is rec...

Страница 8: ...5 Simulated relative radar loop gain as a function of ground plane side length x Ground plane is a solid square ground plane without routing In terms of regulatory compliance any openings in the groun...

Страница 9: ...les in Figure 6 Omitting thermal reliefs as in Figure 6a can increase the boresight RLG by approximately 2 dB provided there are no other interfering components or PCB traces close to the sensor A sma...

Страница 10: ...electrically longer 2 Reflection and refraction loss due to the interface between the sensor and the coating 3 Dielectric loss in the coating material This can usually be neglected for thin coating la...

Страница 11: ...0 Simulated impact of conformal coating with r 2 and r 3 for different thicknesses 3 4 Sensor underfill Underfills can be used to fill the gap between the sensor package and PCB The sensor underfill m...

Страница 12: ...he reflection coefficient has a low value Therefore a low dielectric constant material will minimize the reflections and reduce the impact on the radiation pattern and insertion loss Typically radomes...

Страница 13: ...d power from the target versus the radome to sensor distance for two different service profiles Profile 2 MaxSNR and Profile 1 MaxDepth Amplitude is nomalized by the maximum value of Free Space Amplit...

Страница 14: ...eff where is the thickness of the dielectric When the wave reaches the dielectric air interface 01 another transmission 10 01 and reflections 10 01 happens Notice that the wave will have a sign chang...

Страница 15: ...a 180 phaseshift Figure 15 Impact of the thickness of the radome made of ABS on the reflected amplitude variation The amplitude is normalized to maximum value of the Free Space FS Profile set to Prof...

Страница 16: ...ved 2022 03 08 The optimum distance is valid if the thickness of the radome is optimum as well Otherwise to have a minimum insertion loss on the received signal the distance to the sensor should follo...

Страница 17: ...space Figure 16 Impact of the different materials on the radiation pattern H plane Amplitude is stated in one direction Tx or Rx side For Radar Loop Gain RLG the values will be doubled Figure 17 shows...

Страница 18: ...be doubled It is not recommended to place the cover directly on the sensor Figure 18 shows the radiation pattern on the H plane when the cover ABS plastic sheet is located on top of the sensor In comp...

Страница 19: ...ic constant is the matching layer Depending on the degree of the freedom one can find the optimum thickness or the optimum dielectric constant for the anti reflection layer Figure 19 Illustration of t...

Страница 20: ...age 20 of 32 2022 by Acconeer All rights reserved 2022 03 08 Figure 20 Simulation scenario Sensor air gap the matching layer and the screen Figure 21 Normalized antenna gain Tx or Rx antenna gain wher...

Страница 21: ...s and the second is based on the phase correcting plate which is called Fresnel Zone Plate FZP lens The shape of the hyperbolic lens is chosen so that the rays passing through the lens originating fro...

Страница 22: ...lens with the radome with respect to the free space scenario for the XM112 module see Figure 23 for the prototype pictures The maximum gain happens at 7 5 mm distance for both lenses Other maxima hap...

Страница 23: ...XM112 radome The amplitude is normalized to Free Space FS Gain is stated in one direction Tx or Rx side For Radar Loop Gain RLG the values will be doubled Figure 25 Gain variation of the HPL and FZP l...

Страница 24: ...FZP lens the distance tolerance of 0 5 and 1 mm results in 0 5 and 1 dB gain loss respectively For radar loop HPBW and RLG refer to module datasheets and the lens user guide When the focal distance i...

Страница 25: ...the sensor is set to 2 mm Radius is in dB scale normalized to free space maximum gain Gain value is stated in one direction Tx or Rx side For Radar Loop Gain RLG the values will be doubled Figure 28...

Страница 26: ...ne direction Tx or Rx side For Radar Loop Gain RLG the values will be doubled 5 3 FZP Lens Design The FZP lens characterized in the previous chapters was made of ABS plastic If other materials are to...

Страница 27: ...step s is the thickness of each step F is the focal point p is the number of steps is the wavelength in free space 5 mm at 60 GHz and is the dielectric constant of the chosen material at 60 GHz By us...

Страница 28: ...Hardware and physical integration guideline PCR Sensor A111 Page 28 of 32 2022 by Acconeer All rights reserved 2022 03 08 For further details regarding FZP and hyperbolic lens design see 2...

Страница 29: ...ical integration guideline PCR Sensor A111 Page 29 of 32 2022 03 08 2022 by Acconeer All rights reserved 6 Appendix A Materials Table 1 Measured dielectric constant and loss tangent of different mater...

Страница 30: ...ey IEEE Press 2013 3 S R Artem Boriskin Aperture Antennas for Millimeter and Sub Millimeter Wave Applications Springer 2017 4 Acconeer Expolration Tool Online Available https acconeer python explorati...

Страница 31: ...by Acconeer All rights reserved 8 Revision Date Version Changes 2019 11 13 1 0 Original version 2020 07 02 1 2 Comments on the gain values 2020 11 25 1 3 Added information about conformal coating Upd...

Страница 32: ...particular industry standard Acconeer is not responsible for any failure to meet such industry standard requirements Unless explicitly stated herein this document Acconeer has not performed any regul...

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