Part III: Design & Modeling of Tapered Microstrip Line to Substrate Integrated Wave Guide Transition

[@Mr_ASIC]

اتنمي انك تستمر يادكتور حقيقي محتواك مميز جدا . جودة المعلومة غير مسبوقة

[@saadhassankiani4827]

Well done sir..Thank you for your efforts

[@archiekendall]

keep making these great videos - very useful and well written

[@theseshadesgucci9354]

awesome work ! love the explanation

[@RF_Micrwave]

clear all clc % program to calculate the width and length of a tapered % microstrip % line to match micro strip line to substrate % integrated waveguide. % Posted by Mohamed nezami at: % www.youtube.com/@RF_Micrwave % air filled RWG c=3e8 % m/s %a=18.35e %mm WR75 Ku Band %b=9.175e % mm a=19.05 %mm WR90 X band b=9.525 %mm fc_TE10=c/(2e-3*a) fc_TE20=c/(a*1e-3) %% %SIW e_r=2.2 %DK % RO5880 f=10e9 Lambda=1000*c/f %meters Lambda_g=Lambda/sqrt(e_r) %meters % The equivalent SIW width “Ae” is the width of rectangular % waveguide whose modes exhibit the same propagation % characteristics of the SIW modes a_dielectric=a/sqrt(e_r) % let the via be a 10 mil diameter via or 0.25mm P_via= 1 % VIA pitch D=0.5 % VIA diameter %integrated waveguide width a_SIW=a_dielectric+(D*D)/(0.95*P_via) % length of taper line Quarter_wave_length=Lambda_g/4 % cutt off of SIW fc_SIW=(c*1e3/(2*sqrt(e_r) ))/(a_SIW-D*D/(0.95*P_via)) %% Calculate the Taper width and length nu=376.73; h=0.8; % RO4350 w=0.0001:0.1:10; %variable to find er=e_r; %permitivity of the substrate ae=a_SIW; %siw width z=w./h; f1=120*pi./(nu*h.*(z+1.393+0.667.*log(z+1.444))); b=(er+1)/2+((er-1))/2.*(1./sqrt(1+12./z)); f2=(4.38/ae).*exp(-0.627.*(er./b)); % w/h>1 figure(1) plot(w,f2,w,f1,'red'); title('plot(w,f1,w,f2); w/h>1') xlabel('W') %% % %w/h

[@enstien100]

Thank you

[@SIAT2023]

thanks for useful explanations could you please explain to me when should subtract the vias just from substrate and when substract from the whole layers, i asked because some times no result when subtract from just substrate , and i saw both method on different KZbin

[@SIAT2023]

could you please suggest to me some RF or antenna books which exactly has clear explanation about filter design using SIW and how Extract the equivalent circuit from this filter (need to the fundamental should I follow for each design )

[@zaynebkh5389]

Hello, thank you for these lectures! I would like to know the equivalent of terminal port Z0 (in HFSS) using CST please, I can find wave impedance which is high for SIW (around 200 Ohm) or Zin using Zmatrix and post processing the equation as for a quadripole (Also around 200Ohm).

[@enstien100]

hello, doctor. is there any creteria to choose or claculte radiation boundary size in SIW antenna

[@shoraimkhan562]

When I look for the SIW electric fields, the fields can only be seen on the back side of SIW but not the front. can you please help

[@RF_Micrwave]

you need to specify what part of the assembly to calculate and display the E-field.

[@enstien100]

I did not get a matlab code to calculate transistion paramters?

[@RF_Micrwave]

It is in the comment below

[@RF_Micrwave]

clear all clc % program to calculate the width and length of a tapered % microstrip % line to match micro strip line to substrate % integrated waveguide. % Posted by Mohamed nezami at: % www.youtube.com/@RF_Micrwave % air filled RWG c=3e8 % m/s %a=18.35e %mm WR75 Ku Band %b=9.175e % mm a=19.05 %mm WR90 X band b=9.525 %mm fc_TE10=c/(2e-3*a) fc_TE20=c/(a*1e-3) %% %SIW e_r=2.2 %DK % RO5880 f=10e9 Lambda=1000*c/f %meters Lambda_g=Lambda/sqrt(e_r) %meters % The equivalent SIW width “Ae” is the width of rectangular % waveguide whose modes exhibit the same propagation % characteristics of the SIW modes a_dielectric=a/sqrt(e_r) % let the via be a 10 mil diameter via or 0.25mm P_via= 1 % VIA pitch D=0.5 % VIA diameter %integrated waveguide width a_SIW=a_dielectric+(D*D)/(0.95*P_via) % length of taper line Quarter_wave_length=Lambda_g/4 % cutt off of SIW fc_SIW=(c*1e3/(2*sqrt(e_r) ))/(a_SIW-D*D/(0.95*P_via)) %% Calculate the Taper width and length nu=376.73; h=0.8; % RO4350 w=0.0001:0.1:10; %variable to find er=e_r; %permitivity of the substrate ae=a_SIW; %siw width z=w./h; f1=120*pi./(nu*h.*(z+1.393+0.667.*log(z+1.444))); b=(er+1)/2+((er-1))/2.*(1./sqrt(1+12./z)); f2=(4.38/ae).*exp(-0.627.*(er./b)); % w/h>1 figure(1) plot(w,f2,w,f1,'red'); title('plot(w,f1,w,f2); w/h>1') xlabel('W') %% % %w/h