Ikimonyo cya ANTRA TAGRAB na Ontenna

Kubipimo bifatika bya Antenne Coeefficer D, turabisobanura kuva kurwego rwimirasire ya Antenna Beam.

Ubuyobozi D nicyo kigereranyo cyimbaraga zidasanzwe zubusa p (θ, φ) isobanura agaciro p (φ, φ) av ku murongo uhagurutse mu karere ka kure, kandi ni igipimo kibazwe cyangwa kingana na 1. Ihuriro ryo kubara rikurikira:

Byongeye, ubuyobozi d irashobora kubarwa na formula ikurikira:

D = 4 pi / ω _a

Mubikorwa, kubara bya logarithmic yakoreshwa muguhagararira icyerekezo cyerekezo cya antenne:

D = 10 log ⁡ d

Ubuyobozi bwavuzwe haruguru D burashobora gusobanurwa nkigipimo cyimiterere yumutungo (4π²) Antenne Beam Range ω _A. Kurugero, niba antenne iranyeganyega gusa hejuru yumwanya wo hejuru kandi urumuri rwarwo ni ω _a = 2π radimi, ubwo butange bwacyo ni:

Niba logarithm yimpande zombi zingana na ikigereranyo cyavuzwe haruguru, icyerekezo cya Antenna kijyanye na Isotropi irashobora kuboneka. Twabibutsa ko iyi nyungu ishobora kwerekana gusa imirasire ya Antenna gusa, mubice bya DBI, kuva kwamburwa imikorere ntibifatwa nkinyungu nziza. Ibisubizo byo kubara ni ibi bikurikira:

3.01 Icyiciro :: DBI D = 10 Log ⁡ ibikoresho 2

Antenna yunguka ibice ni DBI na DBD, aho:

DBI: Inyungu zabonetse nimirasire ya antenne ugereranije ningingo, kuko ingingo ya ingingo ifite ω _a = 4π hamwe nunguka ryerekezo ni 0DB;

DBD: Ese inyungu yimirasire ya antenna ugereranije na kimwe cya kabiri cya dipole anten;

Imyiyerekano hagati ya DBI na DBD ni:

2.15 icyiciro :: DBI 0 ibikoresho bya DBD