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Baris 1: {{DISPLAYTITLE:Pita frekuensi K<sub>a</sub>}} K<sub>a</sub> Band (''Kurtz-above'' Band) atau pita [[frekuensi]] K<sub>a</sub> adalah pita gelombang mikro dari [[spektrum elektromagnetik]] dengan jangkauan antara 18GHz – 40GHz. Pita frekuensi K<sub>a</sub> ''uplink'' memiliki jangkauan frekuensi antara 27.5 GHz - 31GHz dan pita frekuensi K<sub>a</sub> ''downlink'' memiliki jangkauan frekuensi antara 18,3GHz -18,8GHz dan 19,7GHz – 20,2GHz. Standar frekuensi ini dikeluarkan oleh IEEE ([[Institute of Electrical and Electronics Engineers]]). {{Pita frekuensi radio}}'''Pita frekuensi K<sub>a</sub>''' ([[bahasa Inggris\|Inggris]]: '''''K<sub>a</sub> Band''''' atau ''Kurtz-above'' band) adalah pita [[gelombang mikro]] dari [[spektrum elektromagnetik]] dengan jangkauan antara 18 GHz – 40 GHz. Pita frekuensi K<sub>a</sub> ''uplink'' memiliki jangkauan frekuensi antara 27.5 GHz - 31 GHz dan pita frekuensi K<sub>a</sub> ''downlink'' memiliki jangkauan frekuensi antara 18,3 GHz -18,8 GHz dan 19,7 GHz – 20,2 GHz. Standar frekuensi ini dikeluarkan oleh IEEE ([[Institute of Electrical and Electronics Engineers]]). == Keuntungan == Pita frekuensi K<sub>a</sub> memiliki beberapa keuntungan antara lain: * Tersedianya [[lebar pita]] frekuensi yang cukup besar, berkisar 27,5  GHz s/d 31  GHz. * Tidak memerlukan antena berukuran besar. Kecilnya diameter [[antenna (radio)\|antena]] pada sisi pengguna akhir, berkisar 60  cm s/d 70  cm membuat biaya yang dikeluarkan pengguna lebih rendah. * Mampu menurunkan secara drastis ''latency''/keterlambatan data yang biasa terjadi ketika data dikirimkan ke satelit dan ditransmisikan kembali ke bumi. == Kekurangan == * [[Satelit]] yang menggunakan pita frekuensi K<sub>a</sub> memerlukan lebih banyak tenaga untuk mentransmisikan sinyal jika dibandingkan dengan satelit yang menggunakan pita frekuensi C. * Semakin tinggi frekuensi K<sub>a</sub> maka semakin rentan terhadap perubahan kondisi ~~atmosfir~~atmosfer, khususnya hujan,<ref>Mirabito, Michael M.A., and Barbara L. Morgenstern, E: "The New Communication Technologies: Applications, Policy, and Impact (Fifth Edition)", Ch.7. UK: Focal Press, 2004</ref>, ~~di mana~~[[dimana]] daya emisi yang diterima akan teredam dan suhu sistem noise meningkat ~~disisi~~di sisi penerima. Hal ini menyebabkan kualitas hubungan, rasio [[sinyal]] terhadap noise akan menurun akibat nilai temperatur, [[suhu]] sistem pada sisi penerima meningkat dan penguatan pada antena penerima menurun.<ref name="ReferenceA">Setiawan, Eddy , E: "Pengenalan Umum Pita Frekuensi Ka dan Industri Satelit Telekomunikasi Pita Lebar Dunia", ASSI Newsletter Number 4, Volume I, April 2000</ref>. == Aplikasi == Saat ini pita frekuensi K<sub>a</sub> diaplikasikan untuk telekomunikasi satelit, antara lain untuk keperluan [[internet]], ''video conference, video telephone, data broadcasting, voice (telepon) rural/remote area, tele-medecine, tele-education,'' SCADA, ''local television (broadcasting) satellite data relay services,'' ''Inter Satellite Links (ISL)'', ''news gathering'' dan ''PC Networks''.<ref~~>Setiawan, Eddy , E:~~ name="~~Pengenalan Umum Pita Frekuensi Ka dan Industri Satelit Telekomunikasi Pita Lebar Dunia~~ReferenceA"~~, ASSI Newsletter Number 4, Volume I, April 2000<~~/~~ref~~>. Namun demikian sebagian besar aplikasi yang akan dilayani oleh pita frekuensi Ka adalah aplikasi Internet dan [[Multimedia]]. <center> ~~==Satelit==~~ {\| class="wikitable" \|+ Alokasi frekuensi Deep Space Network (DSN) dan Near Earth Network (NEN) dalam MHz \|- ! rowspan="2" \| Penamaan band ! colspan="2" \| Pita [[Deep Space Network\|Deep space]] (untuk [[Space radio station\|space stations]] yang berjarak lebih dari 2.000.000 km dari Bumi) ! colspan="2" \| Pita [[Near space]] (untuk space stations yang jaraknya kurang dari 2.000.000 km dari Bumi) \|- <!-- column 1 occupied by cell A --> ! [[Up-link]] (Bumi ke luar angkasa) ! [[Down-link]] (Antariksa ke Bumi) ! Up-link (Bumi ke luar angkasa) ! Down-link (Antariksa ke Bumi) \|- ! [[S band]] \| 2110–2120 \|\| 2290–2300 \|\| 2025–2110 \|\| 2200–2290 \|- ! [[X band]] \| 7 145–7 190 \|\| 8 400–8 450 \|\| 7 190–7 235 \|\| 8 450–8 500 \|- ! [[K band (IEEE)\|K band]] \| * \|\| * \|\| * \|\| 25 500–27 000 \|- ! [[Ka-band]] \| 34 200–34 700 \|\| 31 800–32 300 \|\| * \|\| * \|}</center> <nowiki></nowiki> = Tidak ada penugasan atau tidak didukung oleh [[Deep Space Network\|DSN]] ;Perbandingan standar penunjukan pita radio [[File:Frq Band Comparison.png\|800px\|jmpl\|pus\|Perbandingan designasi penunjukan pita frekuensi\|none]] <center> {\| class="wikitable" \|- ! rowspan="2" colspan="2" \| [[Frekuensi]] ! rowspan="2" \| [[IEEE]] ! rowspan="2" \| [[EU]],<br>[[NATO]],<br>US ECM ! colspan="2" \| [[International Telecommunication Union\|ITU]] \|- ! no. ! sing. \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| \| style="border-left: none; width: 0.5em" \| \| \| rowspan="9" \| [[A band (radio)\|A]] \| colspan="2" \|   \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">3 Hz</span> \| style="border-left: none" \| \| \| align="right" \| [[Extremely low frequency\|1]] \| [[Extremely low frequency\|ELF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">30 Hz</span> \| style="border-left: none" \| \| \| align="right" \| [[Super low frequency\|2]] \| [[Super low frequency\|SLF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">300 Hz</span> \| style="border-left: none" \| \| \| align="right" \| [[Ultra low frequency\|3]] \| [[Ultra low frequency\|ULF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">3 kHz</span> \| style="border-left: none" \| \| \| align="right" \| [[Very low frequency\|4]] \| [[VLF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">30 kHz</span> \| style="border-left: none" \| \| \| align="right" \| [[Low frequency\|5]] \| [[Low frequency\|LF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">300 kHz</span> \| style="border-left: none" \| \| \| align="right" \| [[Medium frequency\|6]] \| [[Medium frequency\|MF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">3 MHz</span> \| style="border-left: none" \| \| [[High frequency\|HF]] \| align="right" \| [[High frequency\|7]] \| [[High frequency\|HF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">30 MHz</span> \| style="border-left: none" \| \| rowspan="2" \| [[VHF]] \| rowspan="2" align="right" \| [[Very high frequency\|8]] \| rowspan="2" \| [[VHF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">250 MHz</span> \| style="border-left: none" \| \| rowspan="2" \| [[B band\|B]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">300 MHz</span> \| style="border-left: none" \| \| rowspan="2" \| [[UHF]] \| rowspan="4" align="right" \| [[Ultra high frequency\|9]] \| rowspan="4" \| [[UHF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">500 MHz</span> \| style="border-left: none" \| \| [[C band (NATO)\|C]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">1 GHz</span> \| style="border-left: none" \| \| [[L band\|L]] \| [[D band (NATO)\|D]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">2 GHz</span> \| style="border-left: none" \| \| rowspan="2" \| [[S band\|S]] \| [[E band (NATO)\|E]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">3 GHz</span> \| style="border-left: none" \| \| [[F band (NATO)\|F]] \| rowspan="9" align="right" \| [[Super high frequency\|10]] \| rowspan="9" \| [[Super high frequency\|SHF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">4 GHz</span> \| style="border-left: none" \| \| rowspan="2" \| [[C band (IEEE)\|C]] \| [[G band (NATO)\|G]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">6 GHz</span> \| style="border-left: none" \| \| [[H band (NATO)\|H]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">8 GHz</span> \| style="border-left: none" \| \| rowspan="2" \| [[X band\|X]] \| [[I band (NATO)\|I]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">10 GHz</span> \| style="border-left: none" \| \| rowspan="3" \| [[J band (NATO)\|J]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">12 GHz</span> \| style="border-left: none" \| \| [[Ku band\|K<sub>u</sub>]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">18 GHz</span> \| style="border-left: none" \| \| rowspan="2" \| [[K band (IEEE)\|K]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">20 GHz</span> \| style="border-left: none" \| \| rowspan="3" \| [[K band (NATO)\|K]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">27 GHz</span> \| style="border-left: none" \| \| rowspan="2" \| [[Ka band\|K<sub>a</sub>]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">30 GHz</span> \| style="border-left: none" \| \| rowspan="6" align="right" \| [[Extremely high frequency\|11]] \| rowspan="6" \| [[Extremely high frequency\|EHF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">40 GHz</span> \| style="border-left: none" \| \| rowspan="2" \| [[V band\|V]] \| [[L band (NATO)\|L]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">60 GHz</span> \| style="border-left: none" \| \| rowspan="2" \| [[M band (NATO)\|M]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">75 GHz</span> \| style="border-left: none" \| \| rowspan="2" \| [[W band\|W]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">100 GHz</span> \| style="border-left: none" \| \| rowspan="2" \| \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">110 GHz</span> \| style="border-left: none" \| \| [[Millimeter band\|mm]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">300 GHz</span> \| style="border-left: none" \| \| \| \| align="right" \| [[Tremendously high frequency\|12]] \| [[Tremendously high frequency\|THF]] \|- \| style="border-top: none; border-bottom: none; border-right: none; text-align: right; vertical-align: top" \| <span style="position: relative; top: -2ex">3 THz</span> \| style="border-left: none" \| \| \| \| colspan="2" \|   \|} </center> == Satelit == Satelit-satelit yang menggunakan pita frekuensi K<sub>a</sub> antara lain: PCG (Hongkong/Singapura) Baris 24 ⟶ 227: * Badr 5 == Catatan == {{reflist}} ~~<references/>~~ == Pranala ~~Luar~~luar == * [http://www.lyngsat.com/launches/ka.html LyngSat] * [http://www.channel-11.net/ina/faq/index.php?category_id=13&faq_id=30 Channel 11 - Connecting The World] {{Webarchive\|url=https://web.archive.org/web/20081229195957/http://www.channel-11.net/ina/faq/index.php?faq_id=30&category_id=13 \|date=2008-12-29 }} * [http://forum.ecoustics.com/bbs/messages/34579/120309.html forum.ecoustics.com] {{Webarchive\|url=https://web.archive.org/web/20080213222733/http://forum.ecoustics.com/bbs/messages/34579/120309.html \|date=2008-02-13 }} * [http://www.elektroindonesia.com/elektro/assi0400.html elektroindonesia.com] * [http://www.tech-faq.com/ka-band.shtml tech-faq.com] [[Kategori:~~Spektrum~~Pita ~~elektromagnetik~~frekuensi gelombang mikro]]