By Professor Syed Idris Syed Hassan Sch of Elect.

Transcript:By Professor Syed Idris Syed Hassan Sch of Elect.:
By Professor Syed Idris Syed Hassan Sch of Elect. & Electron Eng Engineering Campus USM Nibong Tebal 14300 SPS Penang Microwave Circuit Design Introduction 10 weeks lecture + 4 weeks ADS simulation Assessments :8 tests + 2 ADS assignments + 1 final examination Class : 9.00- 10.30 lecture 10.30-11.00 rest (tea break) 11.00-12.30 lecture 12.30- 1.00 test Dates 06/04/02 Morning 20/04/02 Morning 27/04/02 Morning 04/05/02 Morning 11/05/02 Morning 18/05/02 Morning 25/05/02 Morning 08/06/02 Morning 15/06/02 Morning 22/06/02 Morning 29/06/02 morning 06/07/02 Morning 20/07/02 Morning 27/07/02 Morning Syllabus Transmission lines Network parameters Matching techniques Power dividers and combiners Diode circuits Microwave amplifiers Oscillators Filters design Applications Miscellaneous References David M Pozar ,Microwave Engineering- 2nd Ed., John Wiley , 1998 E.H.Fooks & R.A.Zakarevicius, Microwave Engineering using microstrip circuits, Prentice Hall,1989. G. D. Vendelin, A.M.Pavio &U.L.Rohde, Microwave circuit design-using linear and Nonlinear Techniques, John Wiley, 1990. W.H.Hayward, Introduction to Radio Frequency Design, Prentice Hall, 1982. Transmission Line Equivalent Circuit R R L L C G Lossy line Lossless line Analysis From Kirchoff Voltage Law Kirchoff current law (a) (b) Analysis Let’s V=Voejwt , I = Ioejwt Therefore then a b Differentiate with respect to z Analysis The solution of V and I can be written in the form of where Let say at z=0 , V=VL , I=IL and Z=ZL Therefore and e f c d and Analysis Solve simultaneous equations ( e ) and (f ) Inserting in equations ( c) and (d) we have Analysis But and Then, we have and * ** Analysis Or further reduce or For lossless transmission line , g= jb since a=0 Analysis Standing Wave Ratio (SWR) node antinode Ae-gz Begz Reflection coefficient Voltage and current in term of reflection coefficient or Analysis For loss-less transmission line g = jb By substituting in * and ** ,voltage and current amplitude are Voltage at maximum and minimum points are and Therefore For purely resistive load g h Analysis Other related equations From equations (g) and (h), we can find the max and min points Maximum Minimum Important Transmission line equations Zo ZL Zin Various forms of Transmission Lines Parallel wire cable Where a = radius of conductor d = separation between conductors Coaxial cable Where a = radius of inner conductor b = radius of outer conductor c = 3 x 108 m/s a b Micro strip w he er t t=thickness of conductor Substrate Conducted strip