Problem with impedance matching in ADS

[patriot]

impedance matching?

i am confused with the impedance matching,when using the ADS tool"impedance matching utility",the source impedance is the conjugate of Zin2,the load impedance is 50 ohms.After adding the tool-designed matching network to the circuit,the output impedance gets smaller,nearly zero,that is to say farther from 50 ohms.what is the matter?
can anyone suggest me a detailed topology of the matching network?very urgent
thanks very much!
following is the output impedance(without including the stopping-capacitor)
freq1 Zin2
1.30000000000000000E9 9.78340452845667490E-1 + j2.32473486456278170E0
1.31000000000000010E9 9.74940022168845570E-1 + j2.37291833496453420E0
1.31999999999999980E9 9.73043456307617300E-1 + j2.41992627184477050E0
1.33000000000000010E9 9.72692984677364510E-1 + j2.46547423862163930E0
1.34000000000000010E9 9.74128282023430000E-1 + j2.50930789001569200E0
1.35000000000000010E9 9.77648682736302990E-1 + j2.55093036195757470E0
1.35999999999999990E9 9.82855984718990070E-1 + j2.58928644985481290E0
1.36999999999999990E9 9.89078047575209500E-1 + j2.62364618064408810E0
1.38000000000000010E9 9.96948108401825190E-1 + j2.65310998260406720E0
1.39000000000000010E9 1.00540755629910870E0 + j2.67613679621787040E0
1.39999999999999990E9 1.01391701086935940E0 + j2.69081581744140140E0
1.40999999999999990E9 1.02037190078315600E0 + j2.69471908461638820E0
1.41999999999999990E9 1.02129939990832220E0 + j2.68498382449949610E0
1.43000000000000020E9 1.01097421455956950E0 + j2.65871366298249350E0
1.43999999999999990E9 9.79219451170753000E-1 + j2.61485613429572570E0
1.45000000000000000E9 9.11792798460039580E-1 + j2.55767216934097470E0
1.46000000000000000E9 7.92189036726127420E-1 + j2.50402187774351280E0
1.47000000000000000E9 6.15046162773490050E-1 + j2.48919054451372230E0
1.48000000000000000E9 4.06291301467546530E-1 + j2.55247974795779340E0
1.49000000000000000E9 2.21316364027033070E-1 + j2.70334942704004840E0
1.50000000000000000E9 1.03615955777927680E-1 + j2.90786087843425540E0
1.51000000000000000E9 5.65935583268237790E-2 + j3.11846591422005390E0
1.52000000000000000E9 5.85085623636769190E-2 + j3.30737506543891560E0
1.53000000000000000E9 8.63127302105252700E-2 + j3.46743280305691790E0
1.54000000000000000E9 1.25161137748894790E-1 + j3.60187389562484390E0
1.55000000000000000E9 1.66950921196448430E-1 + j3.71647831007003670E0
1.56000000000000010E9 2.08016615270152090E-1 + j3.81638593867748370E0
1.56999999999999980E9 2.46663636592279540E-1 + j3.90556331948583060E0
1.58000000000000010E9 2.82484483895792550E-1 + j3.98695065489327630E0
1.59000000000000010E9 3.15542642878627210E-1 + j4.06256464949570000E0
1.60000000000000010E9 3.46077236149308790E-1 + j4.13392012528315880E0
1.61000000000000010E9 3.74468681632549270E-1 + j4.20206571156040100E0
1.61999999999999990E9 4.01022538037032210E-1 + j4.26772178051947470E0
1.63000000000000010E9 4.26037868475390270E-1 + j4.33147921745088650E0
1.63999999999999990E9 4.49800998197654600E-1 + j4.39371037614776490E0
1.64999999999999990E9 4.72589363550043200E-1 + j4.45472856519722440E0
1.66000000000000010E9 4.94530274897668050E-1 + j4.51473734613535440E0
1.66999999999999990E9 5.15858526557989360E-1 + j4.57391073192073350E0
1.68000000000000020E9 5.36729241683042880E-1 + j4.63238998577480300E0
1.68999999999999990E9 5.57258163919306960E-1 + j4.69028973968307650E0
1.70000000000000000E9 5.77571620858129010E-1 + j4.74771518833811520E0
1.71000000000000020E9 5.97834804647683790E-1 + j4.80472969071529740E0
1.72000000000000000E9 6.18100864909803870E-1 + j4.86145935715103850E0
1.73000000000000000E9 6.38530568327827640E-1 + j4.91800046192519340E0
1.73999999999999980E9 6.59329678604730420E-1 + j4.97453649714462550E0
1.75000000000000000E9 6.80738433750017790E-1 + j5.03124018248771330E0
1.76000000000000020E9 7.03114716308466200E-1 + j5.08836212257973660E0
1.77000000000000000E9 7.27129728217877160E-1 + j5.14622203552351910E0
1.78000000000000000E9 7.53679894058555620E-1 + j5.20506144193573930E0
1.78999999999999980E9 7.84260150449684530E-1 + j5.26520026760072920E0
1.80000000000000000E9 8.21272365354386840E-1 + j5.32677692644841820E0
1.81000000000000010E9 8.68525247310467560E-1 + j5.38955288583425230E0
1.81999999999999980E9 9.32593716217874300E-1 + j5.45260172847116480E0
1.83000000000000010E9 1.02696171868592900E0 + j5.51258886881019980E0
1.83999999999999990E9 1.18352753523598930E0 + j5.55746352617253690E0
1.85000000000000010E9 1.49117534273850020E0 + j5.51587994730228900E0
1.86000000000000010E9 2.03254722595791690E0 + j4.78613066948074020E0
1.86999999999999990E9 1.98424698560360580E-1 + j4.08201572761991120E0
1.88000000000000010E9 9.06937266534016120E-2 + j5.16891765062816330E0
1.88999999999999990E9 2.86192427303025720E-1 + j5.50955054405823130E0
1.89999999999999990E9 4.12235889292521480E-1 + j5.67563868689117700E0

 

[flyhigh]

Re: impedance matching?

Hi,

It is not the same how the matching network is connected, have you check if you didn't mixed up input and output? Try connecting it the other way.

flyhigh