Chithunzi 1 chikuwonetsa chojambula chodziwika bwino cha waveguide, chomwe chili ndi mawonekedwe aatali komanso opapatiza okhala ndi kagawo pakati.Malowa amatha kugwiritsidwa ntchito potumiza mafunde a electromagnetic.
chithunzi 1. Geometry wa ambiri slotted tinyanga tinyanga.
Kutsogolo (Y = 0 nkhope yotseguka mu xz ndege) mlongoti amadyetsedwa.Kumapeto kwakutali nthawi zambiri kumakhala kozungulira pang'ono (mpanda wachitsulo).Waveguide amatha kusangalatsidwa ndi dipole lalifupi (lowoneka kumbuyo kwa mlongoti wa slot) patsamba, kapena ndi waveguide ina.
Kuti tiyambe kusanthula mlongoti wa Chithunzi 1, tiyeni tiwone chitsanzo cha dera.Waveguide palokha imakhala ngati chingwe chotumizira, ndipo mipata mu waveguide imatha kuwonedwa ngati kuvomereza kofananira (kufanana).Waveguide ndi wozungulira pang'ono, kotero mawonekedwe oyandikira akuwonetsedwa mu Chithunzi 1:
chithunzi 2. Circuit model of slotted waveguide antenna.
Malo otsiriza ndi mtunda "d" mpaka kumapeto (omwe ndi ofupikitsidwa, monga momwe tawonetsera pa Chithunzi 2), ndipo zinthu zomwe zimapangidwira zimayikidwa mtunda "L" wina ndi mzake.
Kukula kwa groove kudzapereka chiwongolero cha kutalika kwa mafunde.Wavelegnth yowongolera ndi kutalika kwa mawonekedwe mkati mwa waveguide.The guide wavelength ( ) ndi ntchito ya m'lifupi mwa waveguide ("a") ndi kutalika kwa danga laulere.Pamawonekedwe apamwamba a TE01, mafunde owongolera ndi awa:
Mtunda pakati pa kagawo komaliza ndi kumapeto "d" nthawi zambiri umasankhidwa kukhala kotala wavelength.The theoretical state of the transmission line, the quarter-wavelength short-circuit impedance line transpacting down and open circuit.Chifukwa chake, Chithunzi 2 chimachepetsa ku:
chithunzi 3. Slotted waveguide circuit model pogwiritsa ntchito kotala-wavelength kusintha.
Ngati parameter "L" yasankhidwa kukhala theka la kutalika kwa mafunde, ndiye kuti zolowetsazo ž ohmic impedance zimawonedwa pa theka la kutalika kwa mtunda z ohms."L" ndi chifukwa cha mapangidwe ake kukhala pafupifupi theka la kutalika kwa mafunde.Ngati mlongoti wa waveguide slot wapangidwa motere, ndiye kuti mipata yonse imatha kuonedwa ngati yofanana.Chifukwa chake, kulowetsedwa ndi kulowetsedwa kwa gawo la "N" kutha kuwerengedwa mwachangu monga:
Kulowetsedwa kwa ma waveguide ndi ntchito ya slot impedance.
Chonde dziwani kuti magawo omwe ali pamwambawa ndi ovomerezeka pama frequency amodzi.Pamene mafupipafupi amachokera kumeneko mapangidwe a waveguide amagwira ntchito, padzakhala kuwonongeka kwa ntchito ya antenna.Monga chitsanzo choganizira za kuchuluka kwa ma frequency a slotted waveguide, miyeso yachitsanzo ngati ntchito yama frequency idzawonetsedwa mu S11.Ma waveguide adapangidwa kuti azigwira ntchito pa 10 GHz.Izi zimadyetsedwa ku chakudya cha coaxial pansi, monga momwe tawonetsera pa Chithunzi 4.
Chithunzi 4. The slotted waveguide antenna imadyetsedwa ndi coaxial feed.
Zotsatira za S-parameter zikuwonetsedwa pansipa.
ZINDIKIRANI: Mlongoti uli ndi dontho lalikulu kwambiri pa S11 pafupifupi 10 GHz.Izi zikuwonetsa kuti kugwiritsa ntchito mphamvu zambiri kumawunikiridwa pafupipafupi.Bandiwifi ya mlongoti (ngati S11 ndi yocheperapo -6 dB) imachokera ku 9.7 GHz kufika ku 10.5 GHz, ndikupereka gawo laling'ono la 8%.Dziwani kuti palinso resonance kuzungulira 6.7 ndi 9.2 GHz.Pansi pa 6.5 GHz, pansi pa cutoff waveguide frequency ndipo pafupifupi palibe mphamvu yowunikira.Chiwembu cha S-parameter chomwe chawonetsedwa pamwambapa chimapereka lingaliro labwino la zomwe ma frequency a bandwidth slotted waveguide amafanana.
Njira yowunikira yamitundu itatu ya mafunde a slotted ikuwonetsedwa pansipa (izi zidawerengedwa pogwiritsa ntchito ma electromagnetic phukusi lotchedwa FEKO).Kupindula kwa mlongoti uwu ndi pafupifupi 17 dB.
Zindikirani kuti mu ndege ya XZ (H-ndege), kutalika kwake kumakhala kochepa kwambiri (madigiri 2-5).Mu ndege ya YZ (kapena E-ndege), kutalika kwake kumakhala kokulirapo.
Slotted Waveguide Antenna mndandanda wazinthu zoyambira:
Nthawi yotumiza: Jan-05-2024
