One of the challenges often met by planners of the telecommunications network using microwave radio is surface conditions, especially when passing through the ocean. Propagation conditions above sea surface often result in increasing fading, which significantly affects the reliability of the microwave network. On the other hand, considering that Indonesia is an archipelago, ocean topography is unavoidable, and the use of microwave networks generally considered to be the most efficient among other technologies, especially in Eastern Indonesia. This research aims to respond to such a challenge by planning a microwave communication network using a space diversity technique. The type of microwave network used is a point to point, which links Bali and Lombok islands. The results showed that the use of space diversity techniques could increase fading margins from 34.42 dB to 35.15 dB and availability value from 99.99667% to 99.99873%. Therefore, this technique recommends implementing by telecommunications network providers in accelerating the deployment of connecting networks in areas that have ocean topography.
Sejumlah radar menggunakan I/Q demodulator pada sisi penerima untuk melakukan pengolahan sinyal pantul dari objek yang diterimanya. I/Q demodulator merupakan suatu komponen yang berfungsi untuk memproses sinyal RF ke sinyal I (In-phase) dan sinyal Q (Quadrature). Pada I/Q demodulator, sinyal masukkan akan dikalikan dengan dua sinyal dari LO (Local Oscillator) yang masing-masing berbeda fasa 90 yang kemudian digunakan sebagai mekanisme pendeteksi fasa. Branch-line coupler merupakan suatu rangkaian penggeser fasa yang dapat diimplementasikan dalam membangun I/Q demodulator. Akurasi pergeseran fasa yang dihasilkan branch-line coupler akan memberikan pengaruh terhadap hasil deteksi fasanya. Dalam perancangan dan realisasi branch-line coupler diperlukan suatu kajian untuk mengetahui ketepatan pergeseran fasa yang diperoleh. Pada penelitian ini dilakukan, suatu analisa kerja branch-line coupler hasil dari suatu perancangan dan realisasi yang telah dilakukan untuk suatu deteksi fasa pada radar C-band dengan basis I/Q demodulator. Hasil penelitian menunjukkan bahwa nilai pergeseran yang mendekati 90 menyebabkan nilai fasa sinyal keluaran sebanding dengan fasa sinyal datang.
Kata Kunci: I/Q Demodulator, Branch-Line Coupler, Penggeser Fasa
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.