GRINlensthorlabs

Would such a collimation system affect the reflected signal depending on the frequency? Would that affect the TX-RX-Processing?

Thorlab

1.) The IWR6843ISK-ODS chip has 3 transmitting antennas. Is my understanding correct that only the one transmitting antenna that is in the center of the focal plane of the lens can be used for a defined beam path? How would the signal of the 2 other transmitting antennas be affected by the lens?

Alternatively, you could explore use of lens this will narrow the FOV, Size of the lens need to be considered as antenna should be at the focal point.

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Cylindricallens

You may want to consider absorber material to be put outside the 20X20 FOV desired. There are absorbers with different thickness available, may not be applicable with 3D printer.

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Asphericlensthorlabs

Laserlinepowell lens

The inner part of the lens tube has an anodized thread. Can you estimate what happens with the microwave radiation (60-64Ghz) that hits the wall of the tube? Will it be reflected or absorbed or will it propagate through the tube walls? My question aims in the direction if the lens tube is suitable for limiting the outgoing and incoming beam path to the tube openings?

2.) Is my understanding correct that I would not need a lens in front of the receiving antenna if the beam path of the transmitting antenna is collimated by a lens?

2) Over all field of view of the radar system is decided by the combined Antenna radiation pattern of both Tx and Rx antennas together. By keeping lens only on the Tx you would be improving the antenna gain of the Tx system alone. For the best performance both Tx and Rx antenna are under the lens with larger lens.

GRINlens

1)  Lens will have focal length and point. If the antenna is placed on the focal point, the lens and antenna shows best performance. IWR6843ODS board have 4 RX / 3TX antenna array. We can not avoid non-ideality of lens by missing the focal point.  The large lens gives narrower beam pattern and increase the antenna gain. The large lens shows less non-ideality when the antenna is missing the focal point.

Alternatively, could such a collimation system be manufactured with a 3d printer and the use of microwave absorbing material (for the spectrum of 60-68GHz)? I would be grateful for suggested geometry and material.

thank you for your reply. Regarding your answer suggesting the use of lenses I would like to ask for clarification of the following questions:

There could be reflection happening through the walls of the Tube, It's best if it's non-metallic. However reflections could be filtered out but, strong reflection might limit the dynamic range of the system, i.e. ability to detect weak object at far-away distance. There could be some multi-path reflection from the inner wall this need to be calibrated/considered during the evaluation phase.