chithunzi 1
1. Kuwala bwino
Gawo lina lodziwika bwino pakuwunika momwe ma antennas amatumizidwira ndikulandila ndikuwongolera bwino kwa mtengo. Kwa mlongoti wokhala ndi lobe yayikulu kumbali ya z-axis monga momwe zasonyezedwera pa Chithunzi 1, kugwiritsa ntchito bwino kwa mtengo (BE) kumatanthauzidwa motere:
Ndilo chiŵerengero cha mphamvu yotumizidwa kapena kulandiridwa mkati mwa ngodya ya cone θ1 ku mphamvu yonse yomwe imafalitsidwa kapena kulandiridwa ndi mlongoti. Njira yomwe ili pamwambapa ikhoza kulembedwa motere:
Ngati ngodya yomwe nsonga yoyamba ya ziro kapena mtengo wochepera ikuwonekera yasankhidwa ngati θ1, mphamvu ya mtengo imayimira chiŵerengero cha mphamvu mu lobe yaikulu ku mphamvu yonse. Pazogwiritsa ntchito monga metrology, zakuthambo, ndi radar, tinyanga timafunika kukhala ndi luso lapamwamba kwambiri. Nthawi zambiri kuposa 90% imafunikira, ndipo mphamvu yolandilidwa ndi lobe yam'mbali iyenera kukhala yaying'ono momwe ingathere.
2. Bandwidth
Bandwidth ya mlongoti imatanthauzidwa ngati "mafupipafupi omwe machitidwe ena a mlongoti amakumana ndi miyezo yeniyeni". Bandwidth imatha kuonedwa ngati ma frequency pafupipafupi mbali zonse zapakati pafupipafupi (nthawi zambiri kutanthauza ma frequency a resonant) pomwe mawonekedwe a antenna (monga kulowererapo, mawonekedwe owongolera, kuwala, polarization, sidelobe level, phindu, kuloza kwamitengo, ma radiation. efficiently) ali mkati mwazovomerezeka pambuyo poyerekezera mtengo wapakati pafupipafupi.
. Kwa ma antenna a Broadband, bandwidth nthawi zambiri imawonetsedwa ngati chiŵerengero cha maulendo apamwamba ndi otsika kuti agwire ntchito yovomerezeka. Mwachitsanzo, bandwidth ya 10: 1 imatanthauza kuti maulendo apamwamba ndi 10 maulendo otsika.
. Kwa tinyanga ta narrowband, bandwidth imawonetsedwa ngati kuchuluka kwa kusiyana kwapakati pamtengo wapakati. Mwachitsanzo, 5% bandwidth imatanthauza kuti ma frequency ovomerezeka ndi 5% yapakati pafupipafupi.
Chifukwa mawonekedwe a mlongoti (kulowetsamo, njira yolowera, kupindula, polarization, etc.) amasiyana pafupipafupi, mawonekedwe a bandwidth sali apadera. Nthawi zambiri kusintha kwa njira yolondolera ndi impedance yolowera kumakhala kosiyana. Chifukwa chake, mawonekedwe owongolera a bandwidth ndi bandwidth ya impedance amafunikira kutsindika kusiyana uku. Mayendedwe amtundu wa bandwidth amakhudzana ndi kupindula, mulingo wa sidelobe, beamidth, polarization ndi mayendedwe amtengo, pomwe kulowetsedwa kolowera ndi mphamvu ya radiation zimagwirizana ndi bandwidth ya impedance. Bandwidth nthawi zambiri imanenedwa malinga ndi kuchuluka kwa kuwala, milingo ya sidelobe, ndi mawonekedwe.
Zokambirana zomwe zili pamwambazi zikuganiza kuti miyeso ya network yolumikizira (transformer, counterpoise, etc.) ndi/kapena mlongoti sasintha mwanjira iliyonse ngati ma frequency akusintha. Ngati miyeso yovuta ya antenna ndi / kapena maukonde ophatikizika amatha kusinthidwa moyenera ngati ma frequency akusintha, bandwidth ya narrowband antenna imatha kuonjezedwa. Ngakhale kuti iyi si ntchito yophweka, pali ntchito zomwe zingatheke. Chitsanzo chofala kwambiri ndi mlongoti wa wailesi mu wailesi yagalimoto, yomwe nthawi zambiri imakhala ndi kutalika kosinthika komwe ingagwiritsidwe ntchito kuyitanira mlongoti kuti ulandire bwino.
Kuti mudziwe zambiri za antennas, chonde pitani:
Nthawi yotumiza: Jul-12-2024
