Nhau - Helical Antenna: Sarudzo Yakakodzera yeBroadband Circular Polarization

AKanyanga yeSpiralmuenzaniso wakajairika weantenna yewaya, inoratidzwa nechimiro chayo chakaita sedenderedzwa. Iantenna yebroadband yakakodzera mabhendi eVHF neUHF.

Kanyanga kemuchina kanotenderera kanoshanda pamusoro pemafrequency angangoita 30 MHz kusvika 3 GHz, kunyanya ichifukidza maVHF neUHF bands.

Nheyo dzekuvaka nekushanda kweSpiral Antenna

Antenna yeSpiral inoumbwa nekumonera kondakita kuita chimiro chespiral uye kuibatanidza nepasi kuburikidza ne feedline. Nechimiro chiri nyore, inoburitsa mafungu akatenderera uye inoshandiswa zvakanyanya mukutaurirana kunze kwenyika senge masisitimu esatellite relay.

Mufananidzo uri pamusoro unoratidza sisitimu yeSpiral Antenna inoshandiswa pakutaurirana nesatellite. Maantenna akadaro anowanzoda nzvimbo yakakwana yekuisa panze.

Antenna yeSpiral ine waya yakakora yemhangura kana kuti chubhu yakagadzirwa kuita helix, ichishanda pamwe chete neplane yesimbi yakatsetseka. Mugumo mumwe we helix wakabatana neconductor yepakati yetambo ye coaxial, nepo conductor yekunze yakabatana neplane yepasi.

Mufananidzo uri pamusoro unoratidza chimiro cheSpiral Antenna, neruzivo rwakadzama rwezvikamu zvayo.

Hunhu hwemwaranzi yeSpiral Antenna hunonyanya kutsanangurwa nedhayamita yehelix, nzvimbo iri pakati pekutendeuka (pitch), uye kona yepitch.

Kona yekupidigura inotsanangurwa sekona iri pakati petangent nehelix neplane yakajairika kune helix axis, uye inopiwa na:

Kupi:

•D ndiyo dhayamita ye helix

•S ndiyo nzvimbo yekukwira (nzvimbo iri pakati nepakati pakati pemakona ari pedyo)

•α ndiyo kona yekukwira kwenzwi

Maitiro Ekushanda

MaAntenna eSpiral anoshanda nenzira mbiri huru:

•Nzira Yakajairika (inozivikanwawo senzira yemwaranzi inomira yakatenderedza)

•Axial Mode (inozivikanwawo se end-fire mode kana beam radiation mode)

Nzira yega yega inotsanangurwa zvakadzama pazasi.

Munzira yemwaranzi yakajairika, munda une radiation wakamira padivi pe helix axis, uye wave ine radiation yakatenderera. Iyi nzira inowanikwa kana saizi dze helix dziri diki kana tichienzanisa newavelength. Muchiitiko ichi, hunhu hwemwaranzi hwe helical antenna hunogona kutariswa semusanganiswa we short dipole antenna ne loop antenna.

Mufananidzo uri pamusoro apa unoratidza maitiro emwaranzi yeSpiral Antenna inoshanda nenzira yakajairika.

Iyi nzira inoonekwa nedhayamita ye helix D uye nzvimbo iri pakati pemakona S. Zvakaipa zveiyi nzira yekushanda zvinosanganisira kushanda zvakanaka kwemwaranzi shoma uye bandwidth yakamanikana; saka, haiwanzo shandiswa mumabasa anoshanda.

Axial Mode

Munzira yemwaranzi yeaxial, nzvimbo ine mwaranzi inoratidza hunhu hwekupedzisira-moto pamwe chete ne helix axis, uye wave ine mwaranzi inotenderera kana kuti inenge yakatenderera. Iyi nzira inowanikwa kana denderedzwa re helix rawedzerwa kusvika pakurongeka kwewavelength imwe (λ) uye nzvimbo iri pakati pekutendeuka inenge λ/4. Pasi pemamiriro ezvinhu aya, pateni yemwaranzi yakafara pamwe chete ne axis ine hunhu hwekutungamira, uye mativi emativi anoonekwa pamakona akaparadzana ne axis.

Mufananidzo uri pamusoro apa unoratidza maitiro emwaranzi yeSpiral Antenna inoshanda mu axial mode.

Kana antenna yakagadzirirwa mafungu eRHCP (RHCP) eruoko rwerudyi, haizogamuchire mafungu eLHCP (RHCP) eruoko rweruboshwe, uye zvinopesana. Iyi nzira yekushanda iri nyore kushandisa uye inonyanya kushandiswa mumashandisirwo anoshanda.

Mabhenefiti makuru eSpiral Antenna ndeaya anotevera:

• Chimiro chiri nyore uye chiri nyore kugadzira

•Kutungamira kwepamusoro

•bandwidth yakafara

•Inokwanisa kutenderera polarization

•Yakakodzera mabhendi eHF neVHF

Mashandisirwo makuru eSpiral Antenna ndeaya anotevera:

•Ma antenna e helical rimwe chete kana ma arrays awo anoshandiswa kutumira nekugamuchira masaini eVHF

• Inoshandiswa zvakanyanya mumasisitimu ekutaurirana esatellite uye deep-space probe

•Inoshandiswa mukubatanidza telemetry pakati pezvimbombo zvinokandwa, masatelaiti, nezviteshi zvepasi

•Inoshandiswa kusimbisa kutaurirana pakati peMwedzi nePasi

•Inoitawo basa rakakosha mukushandiswa kweredhiyo yenyeredzi