Descripción: método gráfico de programación entera
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Descripción: mata vela
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Sec. 1 1 I Introduc tion t ion
TA BLE 1-1 Free Space-Wavelengths at Various Frequencies Frequencies
Application
Frequency
i1 H 'urcl«11t:t i1
Power transn1is sion Voice
60 Hz
3000 mi
1000 Hz
300
Broadcast band
!MHz
300 m
FM, TV
100 M !-
-band radar
!z "#
3m 3 cm
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%ac& inode &as i ts own a''!ication and ad(antaes* Bot& transm ission ! ines +*! nd wa(e ides &a(e an e'onentia! t.'e o/ attenation , 0V it& t&e wa(eide &a(in a !o(er attenation t&an a transn1ission !ine o/ ea! !ent&* T&e (a( (a( e ide &o & o* 2 e(er, becomes ecessi(e!. !are at !ower /reencies 3!ess t&an 4 $Hz)* 5nten nas nas &a(e an in(erse-s are-!aw t.'e o/ attenation c&aracteristic, w&ic& is an ad(an2 tae /or !oner distances* Ho(e(er, Ho(e(er, t&e. become (er. ine//icient at !ow /reen ci cies* w&ere t&e '&.sica! size !imitati !imitations ons o/ an antenna are encontered* Fire ! -1 s&ows t&e re!ati(e in't 'o(er reired /or t&e t&ree modes o/ transn1ission i/ a /ied recei( recei(ed ed 'owe r is needed * 5 so!id22 so!id22die!ectr ic co coa a i a ! ! i n e &a(in a !oss o/ 6 # dB7100 /t, a Va(eide &a(in a 6 oss o/ 0*8 d B7 6 ## /t, a n d 120r-