ʻO ka Bandwidth kekahi ʻāpana antenna kumu.Hōʻike ka Bandwidth i ka laulā o nā alapine e hiki ai i ka antenna ke hoʻomālamalama pololei a loaʻa paha ka ikehu.ʻO ka maʻamau, ʻo ka bandwidth i koi ʻia kekahi o nā ʻāpana i hoʻohana ʻia e koho i ke ʻano antenna.No ka laʻana, nui nā ʻano antenna me nā bandwidth liʻiliʻi loa.ʻAʻole hiki ke hoʻohana ʻia kēia mau antenna i nā noi broadband.
Hōʻike pinepine ʻia ka bandwidth ma nā ʻōlelo o ka lākiō hawewe kū ʻana (VSWR).No ka laʻana, hiki ke wehewehe ʻia kahi antenna me kahi VSWR <1.5 ma luna o 100-400 MHz.Wahi a ka ʻōlelo, ʻoi aku ka liʻiliʻi o ka coefficient noʻonoʻo ma mua o 0.2 ma waena o ka pae alapine i ʻōlelo ʻia.No laila, ʻo ka mana i hāʻawi ʻia i ka antenna, ʻo 4% wale nō o ka mana i hōʻike ʻia i ka transmitter.Eia hou, hoʻihoʻi poho S11 =20* LOG10 (0.2) = 13.98 decibels.
E ʻoluʻolu, ʻaʻole i manaʻo ʻia ka manaʻo o ka 96% o ka mana i ka antenna ma ke ʻano o ka radiation electromagnetic propagated.Pono e noʻonoʻo ʻia ka nalowale o ka mana.
Eia hou, e ʻokoʻa ke ʻano radiation me ka pinepine.Ma keʻano laulā, ʻaʻole i hoʻololi nui ke ʻano o ke ʻano radiation i ke alapine.
Aia kekahi mau kūlana ʻē aʻe i hoʻohana ʻia e wehewehe i ka bandwidth.Hiki i kēia ke polarizing i loko o kahi ākea.No ka laʻana, hiki ke wehewehe ʻia kahi antenna circularly polarized i loaʻa ka ratio axial o <3 dB mai 1.4-1.6 GHz (emi ma mua o 3 dB).ʻO kēia ʻano hoʻonohonoho bandwidth polarization ma kahi o nā antenna polarized circularly.
Hōʻike pinepine ʻia ka Bandwidth i kāna Fractional Bandwidth (FBW).ʻO FBW ka ratio o ke alapine i puʻunaue ʻia e ke kikowaena waena (ke alapine kiʻekiʻe me ka haʻahaʻa haʻahaʻa).ʻO ka "Q" o kahi antenna pili pū me ka bandwidth (ʻo ka Q kiʻekiʻe ke ʻano o ka bandwidth haʻahaʻa a me ka hope).
No ka hāʻawi ʻana i kekahi mau hiʻohiʻona paʻa o ka bandwidth, eia kahi papa o nā bandwidths no nā ʻano antenna maʻamau.E pane ana kēia i nā nīnau, "He aha ka bandwidth o kahi antenna dipole?"a "ʻO wai ka antenna i ʻoi aku ka bandwidth kiʻekiʻe - kahi patch a i ʻole helix antenna?".No ka hoʻohālikelike ʻana, loaʻa iā mākou nā antenna me ke alapine waena o 1 GHz (gigahertz) i kēlā me kēia.
Bandwidth o kekahi mau antenna maʻamau.
E like me kāu e ʻike ai mai ka papaʻaina, hiki ke ʻokoʻa ka bandwidth o ka antenna.ʻO nā antenna Patch (microstrip) he bandwidth haʻahaʻa loa, aʻo nā antenna helical he bandwidth nui loa.
Ka manawa hoʻouna: Nov-24-2023
