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It's not an antenna like I thought at first. It's a tuner with 4 MHz instantaneous bandwidth and a very wide tuning range, https://arxiv.org/abs/2009.14383 http
by superkuh 6y ago
It's not an antenna like I thought at first. It's a tuner with 4 MHz instantaneous bandwidth and a very wide tuning range, https://arxiv.org/abs/2009.14383 https://arxiv.org/abs/2009.14383 - the actual (laser intensity) measurements are done within the RF electrical field above a coplanar waveguide track on a PCB.
It's a cool RF tuner. But it still need a real, full size, antenna. It's also not clear to me if they can get the phase informations out of the laser intensity measurements. I suppose it's all a matter of how fast they can sample the light.
- ajsnigrutin 6y agoSo basically, 3x higher than an hackrf (1MHz-~6GHz)? Not bad, but also not something revolutionary.
- callesgg 6y agoHackrf only captures 20 MHz of spectrum. But is tunable to the range you described. You would need 1000 hackrf to capture the entire range at once.
- ajsnigrutin 6y agoBandwidth is 4MHz, according to the article.
- pmorici 6y agoI think the point is that they are improving the technique. In absolute terms the tuning range and bandwidth aren’t particularly notable compared with current technology. For example Lime Microsystems next generation RFIC under development is targeting a range of 100 GHz and 2 GHz of bandwidth. https://limemicro.com/technology/ https://limemicro.com/technology/