Submitted via IRC for SoyCow1984
Researchers at the Georgia Institute of Technology have devised a method for using an origami-based structure to create radio frequency filters that have adjustable dimensions, enabling the devices to change which signals they block throughout a large range of frequencies.
The new approach to creating these tunable filters could have a variety of uses, from antenna systems capable of adapting in real-time to ambient conditions to the next generation of electromagnetic cloaking systems that could be reconfigured on the fly to reflect or absorb different frequencies.
The team focused on one particular pattern of origami, called Miura-Ori, which has the ability to expand and contract like an accordion.
"The Miura-Ori pattern has an infinite number of possible positions along its range of extension from fully compressed to fully expanded," said Glaucio Paulino, the Raymond Allen Jones Chair of Engineering and a professor in the Georgia Tech School of Civil and Environmental Engineering. "A spatial filter made in this fashion can achieve similar versatility, changing which frequency it blocks as the filter is compressed or expanded."
Source: Shape-shifting origami could help antenna systems adapt on the fly
Continuous-range tunable multi-layer frequency selective surfaces using origami and inkjet-printing (DOI: 10.1073/pnas.1812486115) (DX)
(Score: 2) by Freeman on Thursday December 13 2018, @04:42PM (1 child)
It doesn't, but some radio signals get better distance at night. I might could have answered the question better, if I'd gotten the next tier Ham Radio license and it hadn't been going on 20 years since I got it.
Joshua 1:9 "Be strong and of a good courage; be not afraid, neither be thou dismayed: for the Lord thy God is with thee"
(Score: 2) by Knowledge Troll on Thursday December 13 2018, @05:31PM
General class HAM here. You are thinking of the changes in the ionosphere that occur with the night/day cycle. [quora.com]. That isn't really what this article is about.