Editing Decibel (section)

=== Antenna measurements ===
; dB{{sub| i}} : dB(isotropic) <span id="dBi_anchor" class="anchor"></span> – the [[antenna gain|gain]] of an antenna compared with the gain of a theoretical [[isotropic antenna]], which uniformly distributes energy in all directions. [[Linear polarization]] of the EM field is assumed unless noted otherwise.
; dB{{sub| d}} : dB(dipole) – the [[antenna gain|gain]] of an [[antenna (electronics)|antenna]] compared with the gain a half-wave [[dipole antenna]]. 0&nbsp;dBd&nbsp;= 2.15&nbsp;dBi
; dB{{sub| iC}} : dB(isotropic circular) – the gain of an antenna compared to the gain of a theoretical [[Circular polarization|circularly polarized]] isotropic antenna. There is no fixed conversion rule between dB{{sub|iC}} and dB{{sub|i}}, as it depends on the receiving antenna and the field polarization.
; dB{{sub| q}} : dB(quarterwave) – the [[antenna gain|gain]] of an antenna compared to the gain of a quarter wavelength whip. Rarely used, except in some marketing material; {{nobr|0 dB{{sub|q}}}}&nbsp;= {{nobr|−0.85 dB{{sub|i}}}}
; dB{{sub| sm}} : dB{{sub| m²}}, dB(m²) – decibels relative to one square meter: A measure of the [[antenna effective area|effective area]] for capturing signals of the antenna.<ref>{{cite book |first=David |last=Adamy |year=2004 |title=EW&nbsp;102: A second course in electronic warfare |series=Artech House Radar Library |place=Boston, MA |publisher=Artech House |isbn=9781-58053687-5 |page=[{{Google books |plainurl=yes |id=-AkfVZskc64C |page=118 }} 118] |url={{Google books |plainurl=yes |id=-AkfVZskc64C }} |via=Google |access-date=2013-09-16}}</ref>
; dB{{sub| m⁻¹}} : dB(m{{sup|−1}}) – decibels relative to reciprocal of meter: measure of the [[antenna factor]].