1 / 29

Elektromagnetika

Elektromagnetika. Kelompok 3. The Smith Chart. by Fandy Septian Nugroho Muhammad Habibie Philips Lawrence Zesyara Melati Auzriani Ghaniyya. Elektromagnetika. The Smith Chart. Review. Sumbu Impedansi Imajiner. Smith Chart. Sumbu Impedansi riil. Satu putaran setengah panjang gelombang.

marisa
Download Presentation

Elektromagnetika

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Elektromagnetika Kelompok 3

  2. The Smith Chart by FandySeptianNugroho Muhammad Habibie Philips Lawrence ZesyaraMelatiAuzrianiGhaniyya

  3. Elektromagnetika The Smith Chart

  4. Review

  5. SumbuImpedansiImajiner Smith Chart SumbuImpedansiriil Satuputaransetengahpanjanggelombang

  6. Lingkarankonstantkoefisienrefleksi SkaladalamPanjangGelombang Mendekati Generator Menjauhi Generator K. A. Connor RPI ECSE Department

  7. IMpedanceMatching

  8. Matching impedance yaitu upaya untuk mencocokkan impedansi input (Zin) dengan impedansi karakteristik (Z0). Tujuannya: • Menghasilkan VSWR = 1 • Mentransmisikan daya tanpa dipantulkan • Efisiensi transmisi optimum

  9. Quarter Wave Transformer

  10. Ketikabebanmerupakanbebanriil (tidakadakomponenreaktif),maka quarter-wave matching network dapatdigunakan, dimana: • Untukseperempatpanjanggelombang, l = /2 tan (l) = , sehingga

  11. Matching with The Smith Chart

  12. Didapat jarak dari 0,076λ sampai 0,0188λ yaitu 0,112λ • Agar Zin =Z0, maka zin = (1 + j2) – j2 = 1 = z0 (matched!!) • Maka ditambahkan reaktansi = -j100 Ω • Hasil keseluruhan terlihat di figure 6.24b

  13. Drill 6.14 Suppose a 50- T-line is terminated in a 100- load. Determine the required impedance of a quarter-wave matching section of T-line

  14. Admittance ofShunt Stub

  15. Admitansi YL = 1 / ZL Dalam hubung pararel, Ytot = YL1 + YL2

  16. Dalam smith chart, yL adalah pencerminan zL terhadap pusat chart

  17. Untuk shunt stub, pergerakan zin dan yin di keliling chart • Shorted shunt stub pergerakan yinclockwise dari 0.25λ (figure 6-27) • Open ended shunt stub pergerakan yin clockwise dari 0λ

  18. Langkah-langkah: • Plot zLdan yL dalam smith chart. (zL = ) • Buat lingkaran • Putar zL clockwise sepanjang lingkaran sampai memotong lingkaran 1 (apa saja) dan didapat yd. Jarak antara yL danyd adalah panjang d. • jika shunt stub short circuit, pergerakan yL dari 0,25λ clockwise sampai • jika open ended stub circuit, pergerakan yL dari 0 λclockwise sampai • ytot= yd+ yl = 1 + j0 = 1 = y0 • (matched!!)

  19. Contoh 6.7 • Buatlah matching shorted shunt stub network dengan = 50 Ω saat 20 – j55 Ω load. Jawab • zL= = 0,22 + j0,5 Ω • Plot yL dan gerakkan sampai 1 + j2 (dapatyd ) • Gerakkan yl (shunt stub) sampai 1 - j2

  20. Contoh soal • Problem 6.34

  21. Contoh 6.8 • Buatlah matching open ended shunt stub network dengan = 50 Ω saat 150 + j100 Ω load jawab • zL= = 3 + j2 Ω • Plot yL dan gerakkan sampai 1 + j1,6 (dapat yd ) • Gerakkan yl (shunt stub) sampai 1 – j1,6

  22. Contoh soal • Problem 6.35

More Related