Dab tsi yog qhov sib txawv ntawm Wagi kav hlau txais xov thiab log-automatic antennas?

Yagi Antennas (Yagi-UDA kav hlau txais xov) thiab lub sijhawm ua haujlwm, thiab kev siv hluav taws xob, thiab kev siv hluav taws xob, thiab hauv qab no yog cov ncauj lus sib piv thoob plaws qhov tseem ceeb:

 

1. Tus Qauv Tsim Qauv

Yagi Antennas

Muaj aTsav caij(lub zog radiator txuas nrog cov khoom noj), ib qhoua kom muaj tseeb(ntev tshaj li lub caij tsim), thiab ntau yamtus thawj coj(luv dua li lub caij uas tau tsav) .

Cov ntsiab lus tau npaj rau hauv txoj kab ncaj nraim, nrog lub reaforor qab lub caij uas tau tsav caij thiab tus thawj coj nyob rau hauv pem hauv ntej.

Feem ntau muaj tsawg tus ntawm cov ntsiab (e {{{0} {}}}}}}}}}}}}}}}}}}}}}}}

Log-Tim Thaivcom Inanticas

Muaj li ntawmdipole-zoo li cov ntsiab lus(振子) nrog maj mam nce mus ntev, npaj raws lub hauv paus boom lossis pub rau .

Lub caij ntev thiab sib ntsib ua raws li aLog-auficic kev sib raug zoo: Qhov sib npaug ntawm kev sib law liag nyob ntev thiab qhov kev ncua deb yog tas li (e {}}}} i}}}, nyob qhov twg τ<1).

Yuav tsum tau muaj ntau cov ntsiab lus (feem ntau 10 - 30+}) kom ua tiav cov qauv dav, ua kom ntev dua {2}

 

2.} Kev Ua Haujlwm

Yagi Antennas

Resonant tsim: Txhua lub caij (muaj kev cuam tshuam, tsav tsheb, yog cov thawj coj ntawm lub hom phiaj hluav taws xob (Resonant tham nrog cov thawj coj hauv ib qho (rau tus thawj coj (rau tus thawj coj).

Hluav taws xob tau txhim kho los ntawm kev tsim kev cuam tshuam hauv kev taw qhia rau pem hauv ntej (mus rau cov thawj coj) thiab kev cuam tshuam nrog kev cuam tshuam (thaiv los ntawm lub reedor) {0.

Log-Tim Thaivcom Inanticas

Tsis yog-resonant tsim: Tsis muaj ib qho twg yog tuned rau ib qho tshwj xeeb ntau zaus {{}} Tsis muaj zaus, tsuas yog muab cov khoom siv uas tau muab rau hauv hluav taws xob .

Lub cav-automatic piv cuam tshuam tias cov kav hlau txais xov kev ua ntu zus nyob rau ntawm cov kev ua haujlwm dav dav thoob plaws hauv kev sib tw .

 

3. bandwidth

Nov yog tusfeem ntau qhov tseem ceeb:

Yagi Antennas: Nqaim bandwidth (feem ntau 10-20% ntawm qhov chaw nruab nrab) {{}}}}}}}}}}}}}}}} .

Log-Tim Thaivcom Inanticas: Ultra-dav Bandwidth (feem ntau npog ntau lub Kaum Hlis, e}}}}}}}}}}}}

 

4. nce

Yagi Antennas: Kev nce qib ntau hauv lawv cov nqaim bandwidth (feem ntau yog 5-15 dbi).} loj dua bandwidth) {{}}

Log-Tim Thaivcom Inanticas: Nruab nrab tab sis ruaj khov nce hla lawv cov band dav (feem ntau 3-10 {2} {2} {{2}.}}

 

5. kev coj

Ob leeg yogDirectional (End-Hluav Taws) Tiv Thaiv, radiating feem ntau lub zog hauv ib qho kev sib tham:

Yagi Antennas: Lub zog tiag tiag tiag nrog lub ntsej muag nqaim (qis beamwidth) thiab cov sab lob lobes, ua rau lawv muaj siab heev .

Log-Tim Thaivcom Inanticas: Nruab nrab offireity nrog ib me ntsis wider Main Liage tshaj li Yagis, tab sis qhov no beamwidth tseem ruaj khov ntau .

 

6. daim ntaub ntawv

Tus yuam sij distinter in bandwidth drives lawv siv rooj plaub:

Yagi Antennas: Zoo tagnrho rauCov nqaim, cov ntawv thov tu-zausQhov twg muaj qhov siab thiab cov kev ua si ntse yog qhov tseem ceeb, xws li:

TV / xov tooj cua tshaj tawm (e {. g}!}}}}} {{.

Taw tes-rau-taw tes sib txuas lus (e {{{2} g {}}, microwave txuas rau hauv nroog internet).

Amitionur Xov Tooj Cua (HF / VHF Bands) thiab cov tshuab radar .

Log-Tim Thaivcom Inanticas: Nyiam rauCov Ntawv Thov Thoob PlawsYuav tsum tau txais kev pab thoob plaws ntau zaus, xws li:

Cov tshuab sib txuas lus (cov tub rog, kev pabcuam xwm txheej kub ntxhov) yuav tsum ua haujlwm los ua haujlwm ntawm kev sib txawv ntawm {}}

EMC (electromagnetic Compatibility) Kev Ntsuas (txhawm rau ntes kev cuam tshuam thoob plaws hauv bands).

Shortwave rau microwave tau txais microwave tau / transmitters (e {{{} g}, xov tooj cua astronomy) .

 

Ntsiab lus xaus

Tus yam ntxwv	Yagi Antenna	Log-Tim Txwv Kav Hlau Antenna
Lub tsev	Cov Khoom Uas Tsav Caij {{}}} reflect reflect reflect reflect reflect +} Tus Thawj Coj	Series ntawm scaled dipoles (log-authomic piv)
Bandwidth	Nqaim (10-20% ntawm Center zaus)	Dav (ntau tus octaves, e . g.}, 1:10)
Tau	Siab (5-15 dbi) tab sis zaus-nqi	Nruab Nrab (3-10 dBI) thiab ruaj khov hla band
Kev	Ntse (nqaim Main Lobe, qis sab lobes)	Nruab Nrab (Wider Main Lobe, ruaj khov hla dhau kev)
Txoj Cai Kev Ua Haujlwm	Resonant (tuned rau cov nthwv wavelength)	Tsis yog-resonant (adapts rau kev sib txawv wavelengths)
Cov Kev Siv Raug Raug	Tsau-zaus TV, taw tes-rau-taw tes txuas	Kev Sib Txuas Lus Thoob Ntiaj Teb, EMC kuaj

 

Hauv ntej, Yagis Excel nyob rau hauv Splowband, siab-nce cov xwm txheej, thaum Log-ascomic antispensable rau dav dav dav.