Editing Directional antenna (section)

== Applications ==

High gain antennas are typically the largest component of deep space probes, and the highest gain radio antennas are physically enormous structures, such as the [[Arecibo Observatory]]. The [[Deep Space Network]] uses 35&nbsp;m dishes at about 1&nbsp;cm wavelengths. This combination gives the antenna gain of about 100,000,000 (or 80&nbsp;dB, as normally measured), making the transmitter appear about 100&nbsp;million times stronger, and a receiver about 100&nbsp;million times more sensitive, ''provided the target is within the beam''. This beam can cover at most one hundred millionth ({{10^|−8}}) of the sky, so very accurate pointing is required.

Use of high gain and [[millimeter-wave]] communication in [[personal area network|WPAN]] gaining increases the probability of concurrent scheduling of non‐interfering transmissions in a localized area, which results in an immense increase in network throughput. However, the optimum scheduling of concurrent transmission is an [[NP-hard]] problem.<ref>{{cite journal |author1=Bilal, Muhammad |display-authors=etal |year=2014 |title=Time-slotted scheduling schemes for multi-hop concurrent transmission in WPANs with directional antennas |journal=ETRI Journal |volume=36 |issue=3 |pages=374–384 |arxiv=1801.06018 |doi=10.4218/etrij.14.0113.0703 |s2cid=2285688 }}</ref>