Search:

Type: Posts; User: Georgy.Moshkin

Page 1 of 6 1 2 3 4

Search: Search took 0.01 seconds.

  1. Closed: Re: Correction of Frequency in Arrival Direction Detection

    What is E[] ?

    My current understanding is that direction may be found regardless of transmitter frequency deviation.
    How is your transmitter signal is different from Doppler signal reflected from...
  2. Closed: Re: Power considerations for 50 Ohm resistors in power combiners

    SIW Wilkinson power divider may help dissipate more power. Maybe 5-10 times more than microstrip line, depending on substrate thickness, line width.
  3. Closed: Re: Correction of Frequency in Arrival Direction Detection

    I think correction is not required for angular information. For phase monopulse receiver both antennas will receive same transmitter frequency, DOA may be extracted using simple FFT (which may be...
  4. Replies
    8
    Views
    343

    Closed: Re: Frequency Multipier in ADS

    Both components are 50-ohm matched, maybe models have some parameters like supply voltage?
    I would try to put DC-blocks around LHA-13HLN
  5. Closed: Re: Distributed amplifier : What is the purpose extra line at the drain

    I think it is used for matching. Look at 210,211 in US8618883B2 patent (https://patents.google.com/patent/US8618883)
    154762
  6. Closed: Re: How to Short Circuit a SIW slot antenna

    yes, you may check image 2 (a) in this document: http://jpier.org/PIERC/pierc40/07.13040905.pdf
  7. Closed: Re: How to Short Circuit a SIW slot antenna

    You just need to put vias as shown on your second image. It is the same as for air filled waveguides: http://www.antenna-theory.com/antennas/aperture/slottedwaveguide2.php
    Distance between via wall...
  8. Closed: Re: Microstrip antenna design on substrate of 10 mil (0.258mm) and 5 mil (0.168mm)

    Very thin microwave substrates often glued to main FR4 board which solves problem. Thick substrate may be perforated at Vivaldi end with multiple holes or maybe cutout. There are many papers on...
  9. Closed: Re: SMD component fixture for antenna matching prototyping

    You may try wooden toothpicks with some glue. Component is glued to the toothpick and then placed to required points on PCB with slight pressure. Solder plated PCBs often have uneven surfaces,...
  10. Closed: Re: Real time plotting of radiation pattern using matlab

    You may use "drawnow" matlab command, here is good example https://stackoverflow.com/questions/17217774/making-a-gif-from-images
  11. Replies
    1
    Views
    230

    Closed: Re: 300 GHz Antenna Testing

    I have doubts about 0.1deg accuracy. I have used commercial rotating table few times, it had stepper motor and a belt. Most important part was the software, which was able to get data from spectrum...
  12. Replies
    3
    Views
    236

    [SOLVED]Closed: Re: Waveguide Termination

    Need more information. What is termination type, what software?

    When using two identical ports if waveguide length is multiple of 180deg, then you may obtain good S11/S21 even in unmatched...
  13. Replies
    6
    Views
    381

    Closed: Re: Bi-directional amplifier for Wi-Fi

    Interesting design I came across recently: "Reconfigurable Dual Band Bidirectional Reflection Amplifier with Applications in Van Atta Array"
    paper1:...
  14. Closed: Re: Different robotic joint designs (fast/high torque/simple to manufacture)

    Any information on how SpotMini joints?
    According to this

    (https://iit-dlslab.github.io/papers/khan15sicfp.pdf)

    similar robot uses hydraulics:



    But here is electrical motor solution,...
  15. Closed: Different robotic joint designs (fast/high torque/simple to manufacture)

    What are best designs worth trying? Some starting point. Maybe few insights from someone who tried to build such joint and any interesting materials (patent/video/etc.). Interested in leg/arm joint...
  16. Replies
    3
    Views
    262

    Closed: Re: Microwave multipier chip

    I think it will be harder to design 1GHz x10 multiplier with good performance, x5 x2 feels much easier.
    I would recommend to use 5ghz push-push oscillator + 5GHz frequency prescaler IC, and get much...
  17. Closed: Re: Microstrip filter design: question about a part of a book

    Here are my thoughts: 0.2mm wide high impedance section may be manufactured anywhere. When high impedance line is needed I usually use 0.2mm line, or sometimes 0.1524mm (6mil). 4mm wide low impedance...
  18. Replies
    6
    Views
    472

    Closed: Re: Design circular antenna array

    I think direction of arrival may be analyzed without HFSS, some formulas similar to monopulse angle estimation, to see if it is feasible (spacing, substrate size).
    Use HFSS to design single patch...
  19. Replies
    6
    Views
    472

    Closed: Re: Design circular antenna array

    If i understand correctly, you are asking about circular polarized array. The following links give some idea:

    153967...
  20. Closed: Re: How to design unequal Wilkinson divider according Taylor amplitude distribution c

    Check this:
    https://www.microwaves101.com/encyclopedias/unequal-split-wilkinsons-the-rest-of-the-story
    https://www.microwaves101.com/encyclopedias/unequal-split-wilkinsons
    and for more information...
  21. Closed: Re: Stepped impedance band pass filter design.............help me please

    https://www.semanticscholar.org/search?q=stepped%20impedance%20band%20pass%20filter&sort=relevance&pdf=true
  22. Closed: Re: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

    Do you measure frequency of operation? for example using spectrum analyzer or prescaler output pin.
  23. Closed: Re: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

    at what frequency (v_tune)? Did you try to measure at different frequencies?
    Did you solved problem from this topic?...
  24. Closed: Re: BGT24ltr11 compensation structure is matching at 100 ohm and not 50 ohm?

    usx, what was your model, what Er value did you used in ADS? Only sections (2)-(1)-(5)?

    Here is my recent result from finite element code run with pretty dense grid
    parameters: er=3.66 , h=0.25...
  25. Closed: Re: Change circuit topology in Smith V4.1

    It seems that it could not be deleted. I set very small values instead, for example 0.000001 Ohm.
    You may try this one online: https://www.will-kelsey.com/smith_chart/
    elements could be deleted,...
Results 1 to 25 of 146
Page 1 of 6 1 2 3 4