Ndeipi parameter inofanirwa kutariswa nguva yekutora RF sefa?

Paunenge uchigadzira RF mhinduro, RF mafirita anoita mabasa ane mukurumbira muhurongwa. Kana uchinhonga RF sefa, zvinotevera paramita dzinofanirwa kutariswa.

1. Center frequency: f0 ipfupi kune yepakati frequency yepassband yeRF sefa, iyo inowanzotorwa sef0 = (fL+ fH) /2, uye fL uye fH ndiwo mafiriji epadivi ehama 1dB kana 3dB inodonha. kubva kuruboshwe uye kurudyi kwebhendi-pass kana bhendi-stop sefa. Iyo pass-bhendi bandwidth yenarrowband mafirita inowanzoverengerwa nekutora kushoma yekuisa kurasikirwa seyepakati frequency.

2. Cutoff Frequency: Kune iyo yakaderera-pass sefa, inoreva kurudyi frequency point yepassband, uye kune yakakwira-pass filter, inoreva kuruboshwe frequency point yepassband, iyo inowanzotsanangurwa maererano ne1dB. kana 3dB hama yekurasikirwa mapoinzi. Chirevo chekurasikirwa kwehama ndeichi: kune yakaderera pass sefa, kurasikirwa kwekuisa kwakavakirwa paDC, uye kune yakakwira pass filter, kurasikirwa kwekuisa kunoenderana nepamusoro-pamusoro-pasi frequency pasina spurious stop-bhendi.

3. BWxdB: Inoreva hupamhi hwe spectrum inofanira kuyambukwa, BWxdB = (fH-FL). fH nefL ndiwo anoenderana kuruboshwe uye kurudyi frequency mapoinzi paX (dB) akadzikiswa zvichienderana nekurasikirwa kwekuisa pakati frequency f0. X=3, 1, 0.5, kureva BW3dB, BW1dB, BW0.5dB, anowanzo shandiswa kuratidza pass-band bandwidth parameters yefirita. Fractional bandwidth = BW3dB/f0×100%, zvakare inowanzoshandiswa kuratidza pass-bhendi bandwidth yefirita.

 

1. Kurasikirwa Kwekupinza: Nekuda kweRF sefa, chiratidzo chepakutanga mudunhu chinodzikisirwa, kurasikirwa kwayo kunoratidzwa pakati kana cutoff frequency. Kana kudiwa kwekurasikirwa kwe-full-band kunofanira kusimbiswa.

 

1. Ripple: Inoreva peak-to-peak yekuisa kurasikirwa kuchinja nekuwanda kunoenderana nekureva kurasikirwa curve muhuwandu hwe1dB kana 3dB bandwidth (cut-off frequency).

 

 

1. Passband Riplpe: Inoreva shanduko yekuisa kurasikirwa mupass-band frequency. Iyo pass-bhendi shanduko mu1dB bandwidth ndeye 1dB.

 

1. VSWR: Chiratidzo chakakosha kuyera kana chiratidzo chiri mupass-bhendi chesefa chakanyatsoenderana uye chinofambiswa. VSWR= 1:1 ndeyemutambo wakakodzera, VSWR> 1 ndeyekusawirirana. Kune iyo chaiyo RF sefa, iyo bandwidth inogutsa VSWR <1.5: 1 kazhinji ishoma pane BW3dB, uye chikamu chayo kuBW3dB chine hukama nehurongwa hwesefa uye kurasikirwa kwekuisa.
2. Kurasika Kwekudzokera: Zvinoreva reshiyo decibels (dB) yesimba rekupinza uye simba rekuratidzira rechiteshi chechiratidzo, zvakare chinoenzana ne |20Log10ρ|, ρis voltage reflection coefficient. Iko kurasikirwa kwekudzoka kusingagumi kana simba rekuisa rinotorwa nechiteshi.
3. Kurambwa kweStopband: indekisi yakakosha yekuyera sarudzo yeRF sefa. Iyo yakakwirira iyo index iri, zviri nani kudzvanywa kwekunze-kwe-bhendi kupindira chiratidzo. Iko kunowanzove nemaitiro maviri: imwe ndeyekubvunza kuti yakawanda sei dB fs inodzvanywa kune yakapihwa kunze-kwe-bhendi frequency, uye nzira yekuverenga ndiyo attenuation as-il paFS; Imwe ndeyekukurudzira index kuratidza dhigirii yepedyo pakati peamplitude-frequency mhinduro yesefa uye yakakodzera rectangle - rectangle coefficient (KxdB> 1), KxdB=BWxdB/BW3dB, (X inogona kuita 40dB, 30dB, 20dB, nezvimwewo). Iyo yakawanda maodha iyo sefa ine, iyo inowedzera rectangular - ndiko kuti, pedyo K iri padyo neukoshi hwe1, ndiko kunonyanya kuoma kugadzira.

 

Ehe, kunze kwezvinhu zviri pamusoro, iwe unogona kufunga nezve simba rayo rekushanda, kuyerwa kwechishandiso, kana chekushandisa mukati kana kunze, pamwe chete nemajoini. Nekudaro, iyo iri pamusoro apa paramita inonyanya kukosha kusarudza kuita kwayo.

Semugadziri weRF mafirita, Jingxin anogona kukubatsira pane nyaya yeRF mafirita, uye gadzirisa iyo passive sefa zvinoenderana nemhinduro yako. Mamwe mashoko anogona kubvunzwa nesu.