Abstract
The problem that often occurs in VOIP networks using wireless media is the weak signal received and transmitted by the transceiver device at a long distance from the wireless router, so that the quality of VOIP service is often disconnected. The purpose of this research is to design and realize an 11 element yagi antenna with folded feed elements. dipole as an antenna for a transceiver device whose gain is better than a built-in antenna, so that it can support VOIP services. Yagi antenna is an antenna consisting of 3 elements, namely a reflector element, a driven element and a director element. The reflector element and the director element cause the yagi antenna to be directional so that a large gain is obtained from a certain point, while the driven one is used is a folded dipole antenna which has an impedance of 300 ohms so that the matching technique to the 50 ohm transmission line becomes easier. Ghz is less than 1.5 and RL is less than -14 dB. The bandwidth obtained is 620 MHz, the gain is 16.08 dBi with directional radiation and linear polarization. In implementation, the VOIP service is stable at a distance of 50 m using a yagi antenna, compared to the less stable built-in antenna.
Highlights
Jarak antar elemen folded dipole dapat dihitung dengan persamaan s< 6,15 mm Bentuk antena folded dipole dapat digambarkan sebagai berikut: 61,5 mm. 4.4 Penentuan Dimensi Elemen Director Panjang dimensi dari director yagi 11 elemen dengan elemen pencatu folded dipole ditunjukan pada tabel di bawah ini Tabel 1 Hasil perhitungan dimensi director.
4.4 Penentuan Dimensi Elemen Director Panjang dimensi dari director yagi 11 elemen dengan elemen pencatu folded dipole ditunjukan pada tabel di bawah ini Tabel 1 Hasil perhitungan dimensi director.
4.5 Penentuan Dimensi Balun 4:1 Impedansi dari antena folded dipole adalah 300 Ω sehingga tidak dapat langsung dikoneksikan ke conector USB WIFI adapter yang impedansinya 50 Ω.
Summary
< 6,15 mm Bentuk antena folded dipole dapat digambarkan sebagai berikut: 61,5 mm. 4.4 Penentuan Dimensi Elemen Director Panjang dimensi dari director yagi 11 elemen dengan elemen pencatu folded dipole ditunjukan pada tabel di bawah ini Tabel 1 Hasil perhitungan dimensi director. 4.4 Penentuan Dimensi Elemen Director Panjang dimensi dari director yagi 11 elemen dengan elemen pencatu folded dipole ditunjukan pada tabel di bawah ini Tabel 1 Hasil perhitungan dimensi director. 4.5 Penentuan Dimensi Balun 4:1 Impedansi dari antena folded dipole adalah 300 Ω sehingga tidak dapat langsung dikoneksikan ke conector USB WIFI adapter yang impedansinya 50 Ω. Untuk menyepadankan impedansi agar tidak ada teganngan pantul maka dirancang balun 4:1 koaxial dengan perhitungan sesuai persamaan. = 0.5 x λ x Vf = 0.5 x 123 x 0.79 = 48 mm Desain dari balun 4:1 ditujukan pada gambar 4.4 dibawah ini. 4.3 Penentuan Dimensi Elemen Reflector Panjang dari reflector biasanya lebih panjang daripada elemen driven, sehingga persamaan yang digunkan hampir sama dengan panjang elemen driven dengan penambahan 5% Lrflector =(0.5 x λ) + 5%
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