Nhau - Kushandurwa kwesimba mune radar antennas

Mune microwave circuits kana hurongwa, dunhu rose kana hurongwa kazhinji rinoumbwa dzakawanda dzinokosha microwave namano akadai filters, couplers, simba dividers, etc. Zvinotarisirwa kuti kuburikidza namano izvi, zvinokwanisika kuti zvinobudirira kufambisa chiratidzo simba kubva pane imwe nzvimbo kuenda kune imwe nekurasikirwa kushoma;

Mune iyo yese mota radar system, shanduko yesimba inonyanya kusanganisira kutamiswa kwesimba kubva kuchip kuenda kune inodyisa paPCB board, kuendesa iyo yekudyisa kumuviri weantenna, uye nemwaranzi inoshanda yesimba neantenna. Muchiito chese chekufambisa simba, chikamu chakakosha ndechekugadziriswa kweshanduro. Iwo anoshandura mumillimeter wave masisitimu anonyanya kusanganisira microstrip to substrate integrated waveguide (SIW) kutendeuka, microstrip to waveguide conversion, SIW to waveguide conversion, coaxial to waveguide conversion, waveguide to waveguide conversion uye marudzi akasiyana ekuchinja waveguide. Iyi nyaya ichatarisa pane microband SIW shanduko dhizaini.

Mhando dzakasiyana dzezvifambiso zvekutakura

Microstripndeimwe yeanonyanya kushandiswa ekutungamira zvimiro pane yakaderera microwave frequencies. Kubatsira kwayo kukuru ndeye chimiro chakareruka, mutengo wakaderera uye wakakwira kubatanidzwa nepamusoro pegomo components. Iyo yakajairika microstrip mutsara inogadzirwa uchishandisa conductors kune rimwe divi re dielectric layer substrate, ichigadzira imwe pasi ndege kune rumwe rutivi, ine mhepo pamusoro payo. Kondakita wepamusoro chinhu chinoitisa (kazhinji mhangura) chakaumbwa kuita waya nhete. Mutsetse wehupamhi, ukobvu, mvumo yehukama, uye dielectric kurasikirwa tangent ye substrate yakakosha paramita. Pamusoro pezvo, ukobvu hwekondukita (kureva, kukora kwesimbi) uye conductivity yekondukita zvakare yakakosha pamafafitera epamusoro. Nokunyatsofunga izvi parameters uye kushandisa microstrip mitsetse sechinhu chinokosha chikwata zvimwe midziyo, akawanda akadhindwa microwave namano uye zvikamu zvinogona kugadzirwa, zvakadai sefa, couplers, simba dividers/combiners, mixers, etc. Zvisinei sezvo frequency anowedzera (apo kutamira zvishoma yakakwirira microwave frequencies) kutapurirana kurasikirwa kunowedzera uye mwaranzi inoitika. Naizvozvo, hollow tube waveguides senge rectangular waveguides inofarirwa nekuda kwekurasikirwa kudiki pane yakakwirira frequency (hapana mwaranzi). Iko mukati meiyo waveguide inowanzova mhepo. Asi kana ichidikanwa, inogona kuzadzwa ne dielectric zvinhu, ichipa iyo diki muchinjiko-chikamu pane gasi-yakazadzwa waveguide. Nekudaro, hollow tube waveguides anowanzo kurema, anogona kurema kunyanya pazasi ma frequency, anoda epamusoro ekugadzira zvinodiwa uye anodhura, uye haakwanise kubatanidzwa ne planar yakadhindwa zvimiro.

RFMISO MICROSTRIP ANTENNA PRODUCTS:

RM-MA25527-22,25.5-27GHz

RM-MA425435-22,4.25-4.35GHz

Imwe yacho ndeye hybrid kutungamira chimiro pakati peiyo microstrip chimiro uye waveguide, inonzi substrate integrated waveguide (SIW). SIW ndeye yakasanganiswa waveguide-yakafanana chimiro chakagadzirwa pane dielectric material, ine maconductor pamusoro nepasi uye mutsara wemutsara wemarata maviri esimbi achigadzira madziro emadziro. Kuenzaniswa ne microstrip uye waveguide zvimiro, SIW inodhura-inoshanda, ine iri nyore kugadzira maitiro, uye inogona kubatanidzwa ne planar zvishandiso. Uye zvakare, kuita kweakakwira mafrequency kuri nani pane iyo ye microstrip zvimiro uye ine waveguide dispersion zvivakwa. Sezvinoratidzwa mumufananidzo 1;

SIW dhizaini nhungamiro

Substrate integrated waveguides (SIWs) dzakasanganiswa waveguide-senge zvimiro zvinogadzirwa nekushandisa mitsara miviri yesimbi vias akaiswa mu dielectric inobatanidza maviri akafanana simbi mahwendefa. Mitsara yesimbi kuburikidza nemakomba inoumba madziro emativi. Ichi chimiro chine hunhu hwemicrostrip mitsetse uye waveguides. Iyo nzira yekugadzira yakafananawo nedzimwe dzakadhindwa dzakafuratira zvimiro. A yakajairika SIW geometry inoratidzwa Figure 2.1, apo upamhi hwayo (kureva kupatsanurwa pakati vias ari lateral nhungamiro (as)), dhayamita vias (d) uye nenamo kureba (p) anoshandiswa kugadzira SIW chimiro Iyo inonyanya kukosha geometric parameters (inoratidzwa muFigure 2.1) ichatsanangurwa muchikamu chinotevera. Ziva kuti iyo inotungamira modhi ndeye TE10, senge rectangular waveguide. Hukama huri pakati pe cutoff frequency fc yemhepo-yakazadzwa waveguides (AFWG) uye dielectric-yakazadzwa waveguides (DFWG) uye zviyero a uye b ndiyo yekutanga poindi yeSIW dhizaini. Kune mhepo-yakazadzwa waveguides, iyo cutoff frequency inoratidzwa mune fomula pazasi

SIW yakakosha chimiro uye kuverenga formula[1]

uko c ndiko kumhanya kwechiedza munzvimbo yemahara, m uye n ndiwo maitiro, a ndiyo yakareba waveguide size, uye b ndiyo ipfupi waveguide size. Kana waveguide ichishanda muTE10 modhi, inogona kurerutswa ku fc=c/2a; apo waveguide yakazadzwa ne dielectric, kureba kwehupamhi a inoverengwa ne ad = a / Sqrt ( εr ), apo εr ndiyo dielectric nguva dzose yepakati; kuitira Kuita kuti SIW ishande mu TE10 modhi, iyo kuburikidza negomba spacing p, dhayamita d uye yakafara divi sezvinofanirwa kugutsa fomula iri kumusoro kurudyi kwemufananidzo pazasi, uye kune zvakare empirical mafomula e d< λg uye p <2d [2];

uko λg ndiyo inotungamirwa wave wavelength: Panguva imwecheteyo, ukobvu hweiyo substrate haizokanganisa iyo SIW saizi dhizaini, asi ichakanganisa kurasikirwa kwechimiro, saka iyo yakaderera-kurasikirwa zvakanakira yeakakwira-ukobvu substrates inofanirwa kutariswa.

Microstrip kuSIW shanduko
Kana iyo microstrip chimiro ichida kubatanidzwa neSIW, iyo tapered microstrip shanduko ndeimwe yeanonyanya kufarirwa nzira dzekushandura, uye iyo tapered shanduko inowanzopa Broadband match kana ichienzaniswa nedzimwe shanduko dzakadhindwa. Chimiro chekushandura chakanyatsogadziriswa chine zviratidzo zvakaderera zvikuru, uye kurasikirwa kwekuisa kunonyanya kukonzerwa ne dielectric uye conductor kurasikirwa. Kusarudzwa kwe substrate uye conductor zvinhu zvinonyanya kutarisisa kurasikirwa kwekuchinja. Sezvo kukora kweiyo substrate kunotadzisa hupamhi hweiyo microstrip mutsara, iyo parameter yetapered shanduko inofanirwa kugadziriswa kana ukobvu hwe substrate huchichinja. Imwe mhando yeyakavakirwa coplanar waveguide (GCPW) zvakare yakashandiswa zvakanyanya yekufambisa mutsara chimiro mune yakakwirira-frequency masisitimu. Makondakita epadivi ari padyo netambo yepakati yekufambisa anoshandawo sepasi. Nekugadzirisa hupamhi hweiyo huru yekudyisa uye gapu kune padivi pevhu, inodiwa hunhu impedance inogona kuwanikwa.

Microstrip kuSIW uye GCPW kuenda kuSIW

Mufananidzo uri pazasi muenzaniso wekugadzirwa kwe microstrip kuSIW. Iyo yepakati inoshandiswa ndeye Rogers3003, iyo dielectric inogara iri 3.0, iyo chaiyo kurasikirwa kukosha i0.001, uye ukobvu i0.127mm. Iyo yekudyisa hupamhi kumagumo ese ari 0.28mm, inofanana nehupamhi hweantenna feeder. Kuburikidza negomba dhayamita iri d=0.4mm, uye nzvimbo p=0.6mm. Saizi yekufananidza ndeye 50mm * 12mm * 0.127mm. Iko kurasikirwa kwese mupassband ndeye 1.5dB (iyo inogona kuderedzwa nekugadzirisa nzvimbo yakafara-parutivi).