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Type: Posts; User: Georgy.Moshkin

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  1. Closed: Re: Recommendation FPGA + Camera Sensor for capturing still image (2019)

    DCMI+FPGA proof of concept:
    https://www.arducam.com/ (DCMI parallel port +FPGA+SDRAM, i think fpga design is not open source, but as proof of concept)

    DCMI+FPGA dev board:
    search for "alinx fpga...
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    Closed: Re: Slotted Waveguide Antenna

    Longitudinal offset is 180°. Check this (page 7): https://www.qsl.net/n1bwt/ch7_part1.pdf


    Here is another useful explanation:
    http://www.ecs.umass.edu/mie/labs/mda/fea/fealib/moser/anlysis1.htm...
  3. Closed: Trying to understand mismatched antenna behaviour above 20GHz without equipment.

    While combining some fabricated blocks I observed following behavior:

    Antenna module: Wideband antenna with 3GHz bandwidth, input impedance is 100 Ohm.
    Receiver module 1: FET based mixer...
  4. Closed: Re: Broad band dsign of LNA best topology

    Check tunable matching networks.
    Do you need all 12-18 GHz band, or there are some particular frequency bands?
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    [SOLVED]Closed: Re: Half-mode SIW Simulation

    From S-plot it is obvious that cutoff is around 5GHz, but it is not matched. Your Half-mode SIW S-plot shows big insertion loss around 5GHz. Probably placing waveguide port directly on HMSIW edge...
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    [SOLVED]Closed: Re: Half-mode SIW Simulation

    You may try this:
    1. extend dielectric substrate on this wall (near Y axis), only conductor is cut but not dielectric.
    2. check EM-fields distribution in HFSS, result must look similar to this...
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    [SOLVED]Closed: Re: Half-mode SIW Simulation

    I am not familiar with HFSS, just guessing from your image: check this vertical thin wall is not conductor, ensure there are no any hidden walls inside substrate on this side:
    156351
    What is outer...
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    [SOLVED]Closed: Re: Half-mode SIW Simulation

    Could you post an image of your model? You probably have conducting wall on the plane of cut, so it halves waveguide width and doubles frequency. In this case solution would be removing conductive...
  9. Closed: Re: Regarding 5G antenna types & design guideline if any!

    Try https://www.semanticscholar.org/ and search for 5G, sort by recency
    for example:...
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    Closed: Re: Captured field by Array Antenna

    As far as i know simple MIMO radars perform semi-simultaneous sampling, and separate TX/RX antennas are used.
    For your configuration it will be 6 patches: 3 TX patches + 3 RX patches.
    Some kind of...
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    Closed: Re: Captured field by Array Antenna

    Some related thoughts, hope it helps somehow. One problem i see: why "Perfect synchronized local signal between TX and RX"? TX frequency may fluctuate with time, just need to ensure TX is stable...
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    Closed: Re: Captured field by Array Antenna

    Maybe depends on antenna element type? Single patch consist of 2 radiating edges spaced by half-wavelength wide transmission line, so it looks like 2-element array in E-plane. Patch may be cut in...
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    Closed: Re: Patch bowtie matching problem

    maybe this be useful: https://www.hindawi.com/journals/ijap/2013/651040/
    I suggest to simulate separate blocks first. Feeding line with two ports, ensure S21 is good over required bandwidth, and no...
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    Closed: Re: Cellular Power Densities

    Yes, trees will totally block signal at 24GHz, just one layer of leafs in the beam is enough to absorb/reflect most of it. Another problem is that higher frequencies are modulated when reflected by...
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    Closed: Re: Patch bowtie matching problem

    Could you post an image? There are many possible configurations. Possible reasons: wrong feeding, wrong ground plane, but need more information on your design.
    p.s. I think coplanar feeding bowtie...
  16. 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...
  17. 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.
  18. 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...
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    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
  20. 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
  21. 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
  22. 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...
  23. 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...
  24. 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,...
  25. 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
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