Isithombe 1 sibonisa umdwebo we-waveguide ojwayelekile onezikhala, onesakhiwo se-waveguide eside nesincane esinesikhala phakathi. Lesi sikhala singasetshenziswa ukudlulisa amaza kagesi.

isithombe 1. Ijiyometri yama-antenna ajwayelekile ane-slotted waveguide.

I-antenna engaphambili (Y = 0 ubuso obuvulekile endizeni ye-xz) iyaphakelwa. I-ekugcineni ivame ukuba yi-short circuit (i-metallic enclosure). I-waveguide ingase ivuselelwe yi-dipole emfushane (ebonakala ngemuva kwe-antenna yesikhala se-cavity) ekhasini, noma ngomunye u-waveguide.

Ukuze siqale ukuhlaziya i-antenna yesithombe 1, ake sibheke imodeli yesekethe. I-waveguide ngokwayo isebenza njengomugqa wokudlulisela, futhi izikhala ku-waveguide zingabhekwa njengezimvume ezifanayo (ezihambisanayo). I-waveguide i-short-circuit, ngakho-ke imodeli yesekethe eseduze iboniswe ku-Figure 1:

isithombe 2. Imodeli yesekhethi ye-antenna ye-waveguide enezikhala.

Isikhala sokugcina siyibanga "d" kuya ekugcineni (elifinyeziwe, njengoba kuboniswe kuMfanekiso 2), futhi izakhi zesikhala zibekwe ngebanga "L" komunye nomunye.

Usayizi womsele uzonikeza umhlahlandlela we-wavelength. I-wavelegnth yomhlahlandlela yi-wavelength engaphakathi kwe-waveguide. I-wavelength yomhlahlandlela ( ) iwumsebenzi wobubanzi be-waveguide ("a") kanye ne-wavelength yesikhala esikhululekile. Kwimodi ye-TE01 evelele, ama-wavelength okuqondisa yilawa:

Ibanga eliphakathi kwesikhala sokugcina kanye no-"d" wokugcina livame ukukhethwa ukuthi libe yikota yobude be-wavelength. Isimo somqondo somugqa wokudlulisela, umugqa we-impedance we-quarter-wavelength short-circuit odluliselwa phansi uyisekethe evulekile. Ngakho-ke, iSithombe 2 sehla sibe yi:

isithombe 3. Imodeli yesekethe ye-waveguide enezikhala kusetshenziswa ukuguqulwa kobude be-quarter-wave.

Uma ipharamitha ethi "L" ikhethiwe ukuthi ibe yi-wavelength eyingxenye, khona-ke i-input ž ohmic impedance ibukwa ngebanga le-wavelength eyingxenye ye-z ohms. I-"L" iyisizathu sokuthi umklamo ube cishe yi-wavelength engxenye. Uma i-antenna ye-waveguide slot yaklanywa ngale ndlela, khona-ke zonke izikhala zingabhekwa njengezihambisanayo. Ngakho-ke, i-input admittance kanye ne-input impedance ye-"N" element slotted array ingabalwa ngokushesha kanje:

I-input impedance ye-waveguide iwumsebenzi we-slot impedance.

Sicela uqaphele ukuthi amapharamitha okuklama angenhla asebenza kuphela ngemvamisa eyodwa. Njengoba imvamisa iqhubeka lapho umklamo we-waveguide usebenza, kuzoba nokuwohloka kokusebenza kwe-antenna. Njengesibonelo sokucabanga ngezici zemvamisa ye-waveguide enezikhala, izilinganiso zesampula njengomsebenzi wemvamisa zizoboniswa ku-S11. I-waveguide yakhelwe ukusebenza ku-10 GHz. Lokhu kunikezwa ku-coaxial feed ezansi, njengoba kuboniswe kuMfanekiso 4.

Umfanekiso 4. I-antenna ye-waveguide enezikhala iphakelwa yi-feed ye-coaxial.

I-S-parameter plot ephumelayo iboniswe ngezansi.

QAPHELA: I-antenna inokwehla okukhulu kakhulu ku-S11 cishe ku-10 GHz. Lokhu kukhombisa ukuthi ukusetshenziswa kwamandla amaningi kukhanyiswa kule mvamisa. I-bandwidth ye-antenna (uma ichazwa njenge-S11 ingaphansi kuka--6 dB) isuka ku-9.7 GHz iye ku-10.5 GHz, okunikeza i-bandwidth encane engu-8%. Qaphela ukuthi kukhona futhi ukugqama okuzungeze i-6.7 kanye ne-9.2 GHz. Ngaphansi kwe-6.5 GHz, ngaphansi kwemvamisa ye-cutoff waveguide futhi cishe akukho mandla akhanyiswayo. Isakhiwo se-S-parameter esiboniswe ngenhla sinikeza umbono omuhle wokuthi izici zemvamisa ye-bandwidth slotted waveguide zifana nani.

Iphethini yemisebe enezinhlangothi ezintathu ye-waveguide enezikhala iboniswe ngezansi (lokhu kubalwe kusetshenziswa iphakheji ye-electromagnetic yezinombolo ebizwa ngokuthi i-FEKO). Inzuzo yale antenna cishe ingu-17 dB.

Qaphela ukuthi endizeni ye-XZ (indiza ye-H), ububanzi be-beadwidth buncane kakhulu (amadigri angu-2-5). Endizeni ye-YZ (noma indiza ye-E), ububanzi be-beadwidth bukhulu kakhulu.