Nhau - Kushandurwa kwesimba muma antenna e radar

Muma microwave circuits kana masisitimu, circuit yese kana sisitimu inowanzo umbwa nemidziyo yakawanda ye microwave yakadai sema filters, ma couplers, ma power dividers, nezvimwewo. Zvinotarisirwa kuti kuburikidza nemidziyo iyi, zvinokwanisika kutumira simba remasaini zvinobudirira kubva pane imwe nzvimbo kuenda kune imwe pasina kurasikirwa kukuru;

Muhurongwa hwese hwe radar yemotokari, kushandurwa kwesimba kunosanganisira kutamiswa kwesimba kubva ku chip kuenda ku feeder iri paPCB board, kutamiswa kwe feeder kuenda ku antenna body, uye kupenya kwesimba kunoshanda ne antenna. Mukuita kwese kwekutamiswa kwesimba, chikamu chakakosha dhizaini ye converter. Ma converter ari mu millimeter wave system anosanganisira kushandurwa kwe microstrip kuenda ku substrate integrated waveguide (SIW), kushandurwa kwe microstrip kuenda ku waveguide, kushandurwa kwe SIW kuenda ku waveguide, kushandurwa kwe coaxial kuenda ku waveguide, kushandurwa kwe waveguide kuenda ku waveguide uye mhando dzakasiyana dzekushandurwa kwe waveguide. Nyaya iyi ichatarisa pakugadzirwa kwe microband SIW conversion.

Mhando dzakasiyana dzezvivakwa zvekutakura

Microstripndeimwe yenzira dzinoshandiswa zvakanyanya pa microwave frequency yakaderera. Zvakanakira zvayo zvikuru chimiro chiri nyore, mutengo wakaderera uye kubatanidzwa kwakanyanya nezvikamu zvekuisa pamusoro. Mutsetse we microstrip wakajairika unoumbwa uchishandisa ma conductors kune rumwe rutivi rwe dielectric layer substrate, zvichigadzira imwe ground plane kune rimwe divi, nemhepo iri pamusoro payo. Conductor yepamusoro inonyanya kuva conductive material (kazhinji copper) yakagadzirwa kuita waya yakamanikana. Upamhi hwemutsetse, ukobvu, relative permittivity, uye dielectric loss tangent ye substrate zvinhu zvakakosha. Pamusoro pezvo, ukobvu hwe conductor (kureva, metallization thickness) uye conductivity ye conductor zvakakoshawo pama frequency akakwira. Nekufunga zvakanyatsonaka nezvema parameter aya uye kushandisa microstrip lines se base unit yezvimwe zvishandiso, zvishandiso zvakawanda zve microwave zvakadhindwa uye zvikamu zvinogona kugadzirwa, zvakaita se filters, couplers, power dividers/combiners, mixers, nezvimwewo. Zvisinei sezvo frequency ichiwedzera (painoenda kuma microwave frequency akakwira) transmission losses inowedzera uye radiation inoitika. Nokudaro, hollow tube waveguides dzakadai se rectangular waveguides dzinofarirwa nekuda kwekurasikirwa kudiki pama frequency akakwira (hapana radiation). Mukati me waveguide kazhinji mhepo. Asi kana uchida, inogona kuzadzwa nezvinhu zve dielectric, zvichiita kuti ive diki pane cross-section pane waveguide yakazara negasi. Zvisinei, hollow tube waveguides dzinowanzova dzakakura, dzinogona kurema kunyanya pama frequency akaderera, dzinoda zvinodiwa pakugadzira zvakanyanya uye dzinodhura, uye hadzigone kubatanidzwa ne planar printed structures.

Zvigadzirwa zveRFMISO MICROSTRIP antenna:

RM-MA25527-22,25.5-27GHz

RM-MA425435-22,4.25-4.35GHz

Imwe yacho imhando yegwara rekubatanidza pakati pechimiro che microstrip ne waveguide, inonzi substrate integrated waveguide (SIW). SIW imhando yegwara rakabatanidzwa rakagadzirwa pachinhu chinonzi dielectric, ine ma conductors pamusoro nepazasi uye linear array yesimbi mbiri dzinoumba mativi emadziro. Kana tichienzanisa ne microstrip ne waveguide structures, SIW inodhura zvishoma, ine nzira iri nyore yekugadzira, uye inogona kubatanidzwa nemidziyo yakarongwa. Pamusoro pezvo, mashandiro pa high frequency ari nani pane e microstrip structures uye ine waveguide dispersion properties. Sezvakaratidzwa muMufananidzo 1;

Mitemo yekugadzira SIW

Magwara emagetsi akabatanidzwa eSubstrate (SIWs) maumbirwo akafanana newaveguide akagadzirwa nekushandisa mitsara miviri yesimbi yakaputirwa mu dielectric inobatanidza maplate maviri esimbi akafanana. Mitsara yesimbi inopinda mumaburi inoumba madziro emativi. Chimiro ichi chine hunhu hwemitsetse ye microstrip uye mawaveguides. Maitiro ekugadzira akafananawo nezvimwe zvivakwa zvakapfava zvakadhindwa. Geometry yakajairika yeSIW inoratidzwa muMufananidzo 2.1, uko upamhi hwayo (kureva kupatsanurwa pakati pemavias munzira yedivi (as)), dhayamita yemavias (d) uye urefu hwepitch (p) zvinoshandiswa kugadzira chimiro cheSIW. Maparamita ejometri akakosha (anoratidzwa muMufananidzo 2.1) achatsanangurwa muchikamu chinotevera. Cherechedza kuti dominant mode iTE10, serectangular waveguide. Hukama huripo pakati pe cutoff frequency fc yemawaveguides akazadzwa nemhepo (AFWG) uye mawaveguides akazadzwa nedielectric (DFWG) uye saizi a na b ndiyo poindi yekutanga yeSIW design. Kune mawaveguides akazadzwa nemhepo, cutoff frequency iri sezvakaratidzwa mufomula iri pazasi.

Chimiro cheSIW uye fomura yekuverenga [1]

apo c iri kumhanya kwechiedza munzvimbo yakasununguka, m na n ndiwo mamodhi, a iri saizi refu yewaveguide, uye b iri saizi pfupi yewaveguide. Kana waveguide ichishanda muTE10 mode, inogona kurerutswa kuita fc=c/2a; kana waveguide izere ne dielectric, kureba kwebroadside a kunoverengerwa ne ad=a/Sqrt(εr), apo εr iri dielectric constant ye medium; kuitira kuti SIW ishande muTE10 mode, through hole spacing p, dhayamita d uye wide side sezvazvinofanira kuzadzisa fomura iri kurudyi rwepamusoro pemufananidzo uri pazasi, uye kunewo empirical formulas dze d<λg na p<2d [2];

apo λg ndiyo wavelength yemafungu anotungamirwa: Panguva imwe chete, ukobvu hwe substrate hahuzokanganisi dhizaini yehukuru hweSIW, asi huchakanganisa kurasikirwa kwechimiro, saka mabhenefiti asina kurasikirwa akawanda e substrate dzine ukobvu hwakawanda anofanira kufungwa nezvawo.

Kushandurwa kweMicrostrip kuenda kuSIW
Kana chimiro che microstrip chichida kubatanidzwa neSIW, kuchinja kwe microstrip yakapfava ndeimwe yenzira huru dzekuchinja dzinofarirwa, uye kuchinja kwakapfava kunowanzo kupa mukana wekubatanidza broadband kana tichienzanisa nedzimwe shanduko dzakadhindwa. Chimiro chekuchinja chakagadzirwa zvakanaka chine ratidziro shoma, uye kurasikirwa kwekuisa kunonyanya kukonzerwa nekurasikirwa kwe dielectric ne conductor. Kusarudzwa kwezvinhu zve substrate ne conductor zvinonyanya kutarisisa kurasikirwa kwekuchinja. Sezvo ukobvu hwe substrate huchikanganisa hupamhi hwe microstrip line, ma parameter ekuchinja kwakapfava anofanira kugadziriswa kana ukobvu hwe substrate huchichinja. Rumwe rudzi rwe grounded coplanar waveguide (GCPW) imhando ye transmission line inoshandiswa zvakanyanya muma high-frequency systems. Ma side conductors ari pedyo ne intermediate transmission line anoshandawo se ground. Nekugadzirisa hupamhi hwe main feeder uye gap kune side ground, hunhu hunodiwa hunogona kuwanikwa.

Microstrip kuenda kuSIW uye GCPW kuenda kuSIW

Mufananidzo uri pazasi muenzaniso wekugadzirwa kwe microstrip kuenda kuSIW. Medium inoshandiswa ndiRogers3003, dielectric constant i3.0, true loss value i0.001, uye ukobvu i0.127mm. Upamhi hwefeeder kumativi ese i0.28mm, hunoenderana nehupamhi hwe antenna feeder. Upamhi hwe through hole id=0.4mm, uye spacing p=0.6mm. Saizi ye simulation i50mm*12mm*0.127mm. Kurasikirwa kwese mupassband ingangoita 1.5dB (iyo inogona kuderedzwa zvakanyanya nekuvandudza wide-side spacing).