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  1. K

    Agilent ADS 2011 antenna design video(Urdu language)

    For beginers Here you go! If someone is interested i would make an english version of it. https://www.youtube.com/watch?v=ZEf1sxDhv6o
  2. K

    these are the steps to install NS-2

    well if the sign appears that it is installed. no worries
  3. K

    replacing distributed with lumped

    dear friends i was designing a matching network in which i designed a open stub of value 185 ohm with 84 degree length. now the problem is we could only fabricate up to like 65 ohm. i have been told to convert it to lumped component. when i placed its equivalent lumped element i achieve a very...
  4. K

    rat race coupler unsymmetric outupts

    is there any way i could improve the bandwidth of on the narrow band port...because one of the antenna will operate on wideband port and the other one will operate on narrowband which i dont want to happen
  5. K

    rat race coupler unsymmetric outupts

    even i tune them properly still one the delta port has narrow bandwidth than the sum port....i think it might be due to structure of this coupler. the 90 degree hybrid is symmetric in structure so it does not experience this sort of behaviour. does any one have anything else in mind to explain...
  6. K

    rat race coupler unsymmetric outupts

    dear friends i connected my two antennas to the rat race coupler. one to sum port and other to delta port .. when i analyzed input reflection at input port A and input port B, it seems from results that one port is wideband port and other is narrow band port does some one have the idea why is...
  7. K

    measuring S paramters between two componenets in ADS

    dear friends i have connected my coupler with the antenna. so both the input side are terminated in 50 ohm. the only thing i can measure is s11 s22 and s12 and s21. is there any way i could measure the forward transmission or the s parameters on the other side of the coupler, the ports of...
  8. K

    variable gain amplifier

    can one provide some literature regarding variable gain amplifier. or simple shematic on how would we achieve variable gain.
  9. K

    converting lumped capacitor into distributed capacitor

    thanks gys for u help but i was wondering if there is some other way i could implement a distributed capacitor. i have space of 7 mm in total to put in the capacitor but as i said lumped capacitors have very low bandwith
  10. K

    converting lumped capacitor into distributed capacitor

    dear friends i simulated a 12 pF lumped capacitor in ADS at 900 MHz connected in series and now i want to convert this capacitor to distributed one, i mean to implement this using microstrip line. does anyone know how to do it...i read some literature regarding interdigital capaictor but still...
  11. K

    Momentum vs FEM simulation

    dear friends there are two options in ADS momentum and FEM for simulation i am working on an antenna that runs from 700 MHz to 3 GHz. which simulation give the realistic results.....
  12. K

    antenna connected to coupler

    actually i matched the antenna to 50 ohm and then matched the coupler to 50 ohm as well but as i told u when u combine them the two ports of the coupler are occupied by the antenna. so we are left with only s11 and s14. port 2 and port 3 are connected to the antenna. i cannot even figure it in...
  13. K

    antenna connected to coupler

    well i know the what you are talking about but im saying how will i measure the complete system if coupler and antennas get fabricated on pcb board . i cannot measure them separatly once they get fabricated together
  14. K

    antenna connected to coupler

    dear friends i have connected two antenna to my hybrid coupelr one of the port is terminated and the other is the input im thinking how would i measure s21 or s31....forward transmissions..... i can measure s41 the isolation and s11 the input reflection but how the forward transmisson
  15. K

    3D antenna design in ADS

    dear friends i have ADS 2009 update 1 installed on my system. i want to make a 3D antenna. this version contains EMDS for 3D simulation but what si parameters really define a 3D antenna. i mean so i just have to increase the thickness of the copper to make it 3D. i dont have any idea of making...
  16. K

    wideband impedance mathching

    does anyone have information, book or any relevant material on how wide band mathcing is done. in current literature we only find matching at single frequencies and currently all systems are working on wideband....so how is matching achieved at a wide range of frequencies.... could some one...
  17. K

    high self resonance frequency of capacitor

    yes i need the one with high q and high srf also. as i said earlier
  18. K

    high self resonance frequency of capacitor

    actually i want a capacitor 12pF, 9 and 6 pF that will operate at maximum 3 GHz. my supervisor tell me to find a capacitor whose Q is higher and look for SRF of 5 GHz. im very tired of searching. mostly i find is that SRF is at 3 GHz. i really need ur help gys
  19. K

    high self resonance frequency of capacitor

    can any one give me a vendor or spec sheet of a capacitor whose self resonating frequency is above 4 GHz.
  20. K

    bandwidth ofa quater wave microstrip

    could any one tell me whats the bandwidth of a quater wave and half wave transmission line. how the bandwidth of microstrip lines are great than the lumped components

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