a design of the novel coupled-line bandpass filter using defected ...

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53Equivalent circuit calculationIn order to extract equivalent circuit of parallel coupled-line with DGS BPF inFigure 3-15 first extracting the DGS BSF then extracting the one-pole parallelcoupled-line BPFDGS BSFThe circuit parameters for the derived equivalent circuit can be extracted fromthe simulation result. The simulation result of the proposed DGS unit section can bematched to the Butterworth one-pole lowpass response [5]Equivalent circuit of DGSButterworth one-pole prototype lowpass filter circuitThe reactance value of the proposed DGS unit can be expressed as follows:X LC1 ⎛ωω ⎞ω C⎜ω ω⎟⎝0 ⎠0= −0The reactance value of the proposed DGS unit can be expressed as follows:where Ω = ω/ω cXL( Z )=Ω g0 1
54In order to have describes the DGS as lowpass filter characteristics, theequivalent circuit of proposed DGS unit section should be equal to the prototypelowpass filter at a certain frequency. The equality at the cutoff frequency of thelowpass filter is given by the following:XLC| = X |ω= ω L Ω= 1cFrom equality, the equivalent circuit of DGS BSF can calculate by equationC =ωZg102 20 1ω0-ωC1L =4πf C2 20atf 0 is attenuation pole frequencyf c is 3dB cutoff frequencyZ 0 is characteristic impedance (50 ohm)g 1 is the prototype value of the Butterworth lowpass filter (g 1 = 2)From response in Figure 3-13, f 0 = 12 GHz and f c = 8.5 GHz from this equationC = 0.18855 pF and L = 0.93295 nHSimulation of DGS BSF by Advance Design System
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A DESIGN OF THE NOVEL COUPLED-LINE
Page 6 and 7:
LIST OF TABLESTablePage3-1 Circuit
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LIST OF FIGURES (CONTINUED)FigurePa
Page 10 and 11:
CHAPTER 1INTRODUCTIONPresently, the
Page 12 and 13: CHAPTER 2THEORYIn this chapter, bas
Page 14: 5Zcη ⎧w⎛w⎞⎫= ⎨ + 1.393+
Page 22 and 23: 13The even- and odd-mode characteri
Page 24: 15Jnn , + 1Yπ FBW= (2-33c)2g g0 n
Page 27 and 28: 182.5 Chebyshev lowpass filter prot
Page 29 and 30: 20g 0 g 1g 2g 3g nn (even)g n+1org
Page 31 and 32: CHAPTER 3DESIGN AND SIMULATIONIn th
Page 33 and 34: 24TABLE 3-1 Circuit design paramete
Page 35 and 36: 26FIGURE 3-6 Simulation response of
Page 37 and 38: 28FIGURE 3-9 Investigate parameter
Page 39 and 40: 30Figure 3-12 shows the response of
Page 41 and 42: 32(a)(b)FIGURE 3-16 Parallel couple
Page 43 and 44: 34We use the dimensions of one-pole
Page 45 and 46: 36(a) top view and (b) ground viewB
Page 47 and 48: 384.1 Fabrication one-pole parallel
Page 49 and 50: 40FIGURE 4-5 Measurement response o
Page 51 and 52: 42Figure 4-6 show performances of f
Page 53 and 54: CHAPTER 5CONCLUSION AND SUGGESTIONW
Page 55 and 56: From this figure below 8 GHz the re
Page 57 and 58: APPENDIX Ak ANALYSIS
Page 59 and 60: 50Before added rectangular shapeFro
Page 61: APPENDIX BEQUIVALENT CIRCUIT CALCUL
Page 65 and 66: 56⎛=− ⎞=⎝ ⎠1 2FBW ⎜ω
Page 67 and 68: 58Simulation of parallel coupled-li
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