4 ms·
Actually no, a yagi would be very bad. The Radar has a 700MHz bandwidth, almost 12% of the center frequency, and yagis work for a fraction of that. A horn is
by hwillis 12y ago
Actually no, a yagi would be very bad. The Radar has a 700MHz bandwidth, almost 12% of the center frequency, and yagis work for a fraction of that. A horn is pretty simple to make.
- aidenn0 12y agoOh! I didn't see the bandwidth was so wide. You are correct. Wouldn't the resolution still be decent with a narrower bandwidth (i.e. the 10s of MHz that a yagi could manage)? Also, as an alternative to a horn antenna, a parabolic reflector should work well in this band without being too large, right?
- madengr 12y agoNo, FMCW radar range resolution is proportional to RF bandwidth. You would still need the horn as a feed for the dish, but yes, you would get more gain.
- hwillis 12y agoThe range resolution would go from 8.5" to five yards if you changed the bandwidth to 30 MHz. Currently the radar could figure out the direction a person is facing to about 45 degrees. 5 yards would be good to find the orientation of a house. Parabolic antennas are just horns with lenses. The bigger the parabola, the better the focus and the wider the bandwidth. A horn would be a few inches across, but a 700 MHz reflector would be a couple feet.