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Link Budget antena WiFi

Link Budget antena WiFi. Apa itu dB, dBW , dBm , dBi ?. dB (decibel) : Adalahsatuanfactorpenguatanjika nilainya positif , dan pelemahan / redaman / lossjika nilainya negatif . dBW satuan level daya dengan referensi daya 1 watt.

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Link Budget antena WiFi

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  1. Link BudgetantenaWiFi

  2. Apaitu dB, dBW, dBm, dBi?

  3. dB (decibel) : Adalahsatuanfactorpenguatanjikanilainyapositif, danpelemahan/redaman/lossjikanilainyanegatif. • dBWsatuan level dayadenganreferensidaya 1 watt. • dBmsatuan level dayadenganreferensidaya 1 mW =1/10³watt • dBisatuan gain antenna denganreferensiantenaisotropis yang memiliki gain= 1.

  4. dB(decibel) Jika input= 1 watt, output= 100 watt makaterjadipenguatan 100 kali Jika input= 100 watt, output= 50 watt makaterjadiredaman/loss½daya JikadinyatakandalamdB: G= 10 log100/1 = 20 dB G= 10 log50/100 = -3 dB  maka disebut redaman/loss 3 dB Latihansoal

  5. dBWdandBmadalahsatuan level daya P(dBW) = 10 Log P(watt)/1 watt Contoh: 1. 10 watt = ……. dbW 2. 100 watt = …… dBW 3. 1000 watt = ……. dBW Jwb: 1. P (dBW) = 10 Log 10 watt/1 watt = 10 Log 10 = 10 dBW 2. P (dBW) = 10 Log 100 watt/1 watt = 10 Log 100 = 20 dBW 3. P (dBW)= 10 Log 1000 watt/1 watt = 10 Log 1000 = 30 dBW Contoh: 1. 10 Watt = ……. dBm 2. 100 Watt = ……. dBm 3. 1000 Watt= ……. dBm kesimpulan

  6. Kesimpulan Kesimpulan: P (dBm) = P (dBW) + 30 atau, P (dBW) = P (dBm) – 30, sehingga: • 10 Watt= 10 dBW = 40 dBm • 100 Watt= 20 dBW = 50 dBm • 1000 Watt= 30 dBW = 60 dBm Soal lat

  7. Latihan • 15 dbW = …. dBm • 60 dBm= …. dBW • 20 dbW=……dBm jawaban

  8. JawabanLatihan • 15 dbW = …. dBm15 + 30 = 45 dBm • 60 dBm= …. dBW60 – 30 = 30 dBW • 20 dbW=……dBm 20 + 30 = 50 dBm Back slide 3

  9. dBi Yogi antenna Contoh: AntenaColinearmemilikiGain 7 kali dibanding antenna Yogi. BerapadBi Gain antenna Colineartsb? Jawab: G= 10 log7 = 8.45 dBi Colonear antenna

  10. Latihansoal Latihan 1 : Sebuah Amplifier mempunyai gain= 20 dB, jikadiberi input 10 dBmberapa Output amplifier tersebut? Latihan 2 : Sebuah Amplifier dengan gain 30 dB, jikaoutputnya sebesar45 dBmberapa Level inputnya? Latihan 3 : Output amplifier sebesar 30 dBmakandilewatkankabeldenganredaman/loss2 dB. Berapa level sinyalsetelahmelewatikabel? Latihan 4 : Output RF amplifier sebesar 20 dBmakandiumpankanke antenna parabolic dengan Gain= 15 dB melaluikabel pigtail yang memilikiredaman /Loss 2 dB. Berapa EIRP darisinyaltsb. Jawabansoal Back slide 3

  11. Jawabansoallatihan JawabLatihan 1: • Pout(dBm) = Pin(dBm) + G= 10 + 20 = 30 dBm JawabLatihan 2: • Pout(dBm) = Pin(dBm) + G Pin= Pout– G= 45 – 30 = 15 dBm JawabLatihan 3: • Pout= Pin– L= 30 – 2 = 28 dBm JawabLatihan 4: • EIRP = Po – L+ Ga = 20 – 2 + 15 = 33 dBm

  12. JARAK TITIK FOCUS PARABOLIC F= D^2/(16 * d) F : Jaraktitik focus dari center parabolic dish D : Diameter d : kedalaman(depth)

  13. Kasus Contoh: • Parabolic dish dengan D= 70 cm, d= 20 cm, makajaraktitik focus dari center dish: Jawab: • F= D^2/(16*d) = 70^2 /(16*20) = 15.3 cm

  14. LEBAR BEAM/SUDUTPANCARAN(BEAMWIDTH) PARABOLIC BW = ((3*10^8/f)*57.29)/D* √ἣ BW : Beamwidth(deg) f : frekuensi d : diameterparabolic(m) ἣ : Effisiensi antenna (0.5) yang bagus (buatanpabrik), Contoh: Antenaparabolicdgdiameter(d) : 70 cm Frekuensi: 2.4 Ghz = 2.4*10^9 Hz Effisiensi: 0.4 BW : ? Jwb: BW = ((3*10^8/2.4*10^9)*57.29)/0.7*√ 0.4) *57.29 = 16.17 degrees

  15. GAIN ANTENA PARABOLIC G= 10 LogEff+ 20 Logf+ 20 LogD+ 20.4 G : Gainantenna parabolic(dB) Eff : Efisiensi f : frekuensi(GHz) D : Diameter(m) Contoh: Diameter(d) : 70 cm(=0.7m) Frekuensi(f) : 2.4 GHz Effisiensi: 0.4 Jawab: G= 10 Log0.4 + 20 Log2.4 + 20 Log0.7 + 20.4 = 20.926 dB~ 21 dB

  16. REDAMAN RUANG BEBAS (FREE SPACE LOSS) Lfs= 92.5 + 20 Log d + 20 Log f Lfs : Redamanruangbebas/Free Space Loss(dB) d : Jarak(km) f : Frekuensi(GHz) Contoh: Akandibuatjaringandarirumahkekantor dg frekuensi2.4 GHz danjarak10 km. Beraparedamanruangbebasuntukjaraktsb? Jawab: Lfs = 92.5 + 20 Log 10 + 20 Log 2.4 = 120 dB

  17. LINK BUDGET Perhitungan link radio untukmenentukanapakah RF power yang dipancarkan Station Amemenuhisyarat minimum level yang diperlukansetelahditerimadi StationB, sehingakedua station dapatberkomunikasidenganbaik.

  18. ContohKasus JarakrumahkeISP = 10 km. Akandibuat radio link dg frek2.4 GHz Menggunakan sepasang WLAN dg TxPower= 15 dBm, Rx Sensitivity= -83 dBm. Antena parabolic yang digunakandirumahGt= 22 dB, antenna yang di ISP Gr= 19 dB. Loss/redaman) salurantransmisidari WLAN keAntenadiabaikan. Pertanyaan: Apakahrumahdan ISP dapatberkomunikasidenganbaik?

  19. Jawab Lfs = 92.5 + 20 Logf + 20 Logd = 92.5 + 20 Log2.4 + 20 Log10 = 120 dB RSL= Tx+ Gt– Lfs+ Gr = 15 + 22 – 120 + 19 = - 64 dBm Lihat RSL(-64 dBm) > Rx Sensitivity(-83 dBm) • RSL sebesar 19 dB lebihbesardari level minimum yang diperlukansehingga rumahdan ISP dapatberkomunikasidengan rate maksimum. • Dalampraktek RSL 15 dB diatas Rx Sensitivity sudahcukup(disebut Fading margin atauSistem Operating Margin)

  20. software Radio Mobile version 9.5.0

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