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Recent content by ashahclpra

  1. A

    To measure the gain of MIMO antenna

    I want to find the gain (NOT about Diversity Gain) of my MIMO antenna. My MIMO consist of two antenna. so to find gain should i measure gain of one antenna at a time or power both antenna simultaneously and then measure the gain ? Thanks
  2. A

    how to search problem in antenna engineering

    hi i am prashant, i just got a Ph.D in RF and Microwave and i want to write some some for IEEE Transection. Please tell me how i find specific problem in antenna. thanks
  3. A

    How to extract frequency dispersion curve of metasurface

    How can i extract frequency dispersion curve of metasurface in cst
  4. A

    how metasurface improves the gain and return loss on microstrip antenna

    how the metasurface above the microstrip patch antenna improves the gain, return loss and other parameters.
  5. A

    meta material unit cell simulation

    sir this is the simple meta material unit cell simulation and i want to extract the permittivity and permeability w.r.t frequency.
  6. A

    meta material unit cell simulation

    Hi i refer the distance between unit cell and rad box i keep it at lambda/4. and please tell me how i extract the permeability and permittivity. I see many tutorial on youtube or internet of unit cell simulation but i didn't understand how they plot permittivity and permeability w.r.t frequency...
  7. A

    meta material unit cell simulation

    hi i am prashant, simulating metasurface unit cell in hfss but i found many difficulty how much distant is you box from unit cell. when i keep it at labbda/10 i didn't get satisfactory result. thanks
  8. A

    coax feed length of patch antenna

    i am simulating the circular polarize patch antenna with coax feed. i am getting good AR and s11 at 2.45GHz. My coax feed length is 5mm. Is coax feed length affect any of these result if i change it. Please help me Thanks
  9. A

    change in axial ratio on changing frequency sweep

    i solve this model on both driven model and driven terminal. on increasing sweep i still get two different data , it dosen't show me any warning that your solution is not converge. so please tell me what i do. Thanks
  10. A

    change in axial ratio on changing frequency sweep

    i simulate the circular polarize patch antenna at 2.45 GHz and frequency sweep is 2.2 to 2.6 GHz i get good result on fast sweep but when i change the frequency sweep from 2.2 to 6 GHz my results suddenly change. my axial ratio changes from 0.74db to 5.6db,s11 from -23db to -18db and gain from...
  11. A

    co axial feed length

    please tell me how to design the feed length of co axial port in hfss , is it effect the gain of patch antenna. when i change the feed length my gain is varies or it depend upon the frequency. also give me the formula for calculating that. thanks
  12. A

    negative gain in patch antenna

    i designed a circular polarize patch antenna of patc 80×80mm sq and substrate of size 90×90mm sq at 920MHz. the inner and outer radius of co axial port is 1mm and 3.9mm ,ε=3.38 but i got gain in negative.please tell me why my gain is in negative and how it will be positive. Thanks
  13. A

    how to split the port into multiple port

    i want to simulate coupled coil but i assign the transmitting as lumpPort and receiving coil also as lumpPort but when i simulate it ask for splitting port into multiple port. so, please tell me how can i do this. Thanks
  14. A

    coupling coil simulation on hfss

    can any one send one me the .hfss file of coupled coil simulation. i already make the receiver coil i face some problem with making transmitter coil , i can't excite it. Thanks
  15. A

    How to design couple coil

    Hellow, i want to simulate coupled square spiral coil. But i confuse how many port define in both the coil and how to find power efficiency. please also tell me the formula for s12 or s21 i simulate single coil and i define two port one at starting and other at end. Thanks
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