************************************************************** * low pass filter WR34 * * * * erstellt am 20180810 * * letzte Änderung am 20180813 * * fmin = cutoff * * fmax = cutoff next higher mode * ************************************************************** c0: 299792458 * speed of light in vacuum a1: 8.636mm * waveguide dimension a * f1: 17.357GHz * cutoff TE01 * * f2: 34.715GHz * cutoff TE02 * * f0: ((f1+f2)/2) * center frequency * lambda0: (c0/f) * length in vacuum * zwg: (377/(SQRT(1-(f1**2/f**2)))) * impedance * lambdawg: (lambda0/SQRT(1-((lambda0**2)/((2*a1)**2)))) pwg: (360*(lambdawg/(2*a1))) * phase in waveguide * fcalc: (f) * current frequency during simulation * ************** physical dimensions *** * l1: (0.00775) * in mm * * w1: 1.2 * w2: 4.1 * ************************************** l1pwg: ((l1/lambdawg)*pwg) * blk trf 1 2 R1=50 R2=zwg * matching transformer from 50 Ohm * ind 2 3 L=1.2nh ind 3 0 L=2.8nh ind 3 4 L=1.2nh trl 4 5 Z=zwg e=l1pwg f=fcalc ind 5 6 L=1.2nh ind 6 0 L=2.8nh ind 6 7 L=1.2nh * trf 7 8 R1=zwg R2=50 * matching transformer to 50 Ohm * lowp: 2POR 1 8 END 64 * 65 FREQ 66 STEP 18GHz 34GHz 33MHz 67 END