8-12 Ghz X Band Frequency Oscillator Transmitter Schematic Needed !

Discussion in 'The Projects Forum' started by kayjabbar, Sep 16, 2016.

  1. kayjabbar

    Thread Starter Member

    Sep 8, 2016
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    Hello folks,

    Can anyone please provide me 8-12 Ghz X Band Frequency oscillator (EM waves) circuit diagram?

    The transmission is desired by the means of microstrip antenna.

    Im in a hurry..i need it urgently, please help.

    It can be crystal oscillator.
    I googled it alot for the required frequency i couldnt find any..
    And if someone posts please give me the ready schematic because im weak at calculations for components which sometimes need to be changed for desired frequency.

    Only 9 or 10 Ghz fixed oscillator transmitter will be okay for me.



    Thankyou
     
    Last edited: Sep 16, 2016
  2. Papabravo

    Expert

    Feb 24, 2006
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    You're asking for a heavy duty piece of design work for free. It seems reasonable to question you about your requirements. Don't you agree that accurately specifying your requirements will raise the probability of getting something that you want and can use?
     
  3. Sensacell

    Well-Known Member

    Jun 19, 2012
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    I think you totally misunderstand the point of "cross questioning" - without understanding the specific, exact context, application and parameters of a problem, the answers can only random shots in the dark.

    Playing guessing games is no fun, I do this for the satisfaction of helping people learn and accomplish goals, If you want garbage answers, pick something random from the internet.

    Often threads "are left with no solution" because the poster learned that their original idea was flawed, or a concept was misunderstood, this is what helping people is all about.
     
  4. Papabravo

    Expert

    Feb 24, 2006
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    If you have access to an ARRL Handbook there is a 10 GHz. Gunn Diode oscillator that might do the trick.
     
  5. kayjabbar

    Thread Starter Member

    Sep 8, 2016
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    Okay im sorry for my last lines..i need help please forget it.

    I need to design a resonator actually for moisture measurement..
    First i want a transmitter and then a reciever which indicates the phase shift on a digital display.

    I am posting a pdf file that would help in understanding of what i want..

    On the reciever side it is required to have an attenuator before indicator to display the phase shift.

    At X bands water molecules orient with the microwaves/EM waves and start rotating some of the energy is absorbed ,thus the phase shift or frequency change or Q(signal imbalance) is the measure of moisture content which is recorded by the reciever.
     
  6. kayjabbar

    Thread Starter Member

    Sep 8, 2016
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    The exact thing needed is here in this attachment. File named AS-120 pleva.pdf.

    The oscillator of 8-12 Ghz is required for this purpose.

    I hope you all get it now..
    If any questions you may ask..
    Im sorry i was a bit frustrated.
     
  7. kayjabbar

    Thread Starter Member

    Sep 8, 2016
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    Wien bridge oscillator could do the thing by changes in RC values? Just asking
     
  8. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    This seems like an extension of another thread by you: http://forum.allaboutcircuits.com/threads/microwave-moisture-measuring-sensor-need-help.127243/

    In the former thread, you seemed focused on getting a 1 GHz oscillator and/or detector for which you could vary the wavelength while keeping the frequency constant. Does your new 10-GHz design have the same constraint?

    If not, then why don't the same physical principles that you believed applied there apply here too?

    John
     
  9. bertus

    Administrator

    Apr 5, 2008
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  10. kayjabbar

    Thread Starter Member

    Sep 8, 2016
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    Actually i researched more on it now im sure that its x band which would do the same thing please help..im sure that x band range nearly 9 to 10 ghz is used to detect moisture contactless.
     
  11. kayjabbar

    Thread Starter Member

    Sep 8, 2016
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    I searched as quartz crystal oscillator, 9ghz rf/microwave transmitter etc..
    Please help me guys..
     
  12. Papabravo

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    Feb 24, 2006
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  13. BR-549

    Well-Known Member

    Sep 22, 2013
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  14. BR-549

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    Sep 22, 2013
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    And if I am not mistaken..........MEMS devices operate in the GHz range now, and supposedly are easy to configure.

    Might want to research there.
     
  15. jkwilborn

    New Member

    Jan 26, 2016
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    By the definitions that I read above (or other realted/linked post), I think the worry is the detector, not the 1 G oscillator. Seems that's probably what the precision detector is all about. It's similar to sticking a steal rod in an active inductor circuit, changes the inductance and therefore that emf field. Building something that detects that distortion of the emf field is the trick.... Best of luck.

    Also there is no such thing as a '1 GHz oscillator and/or detector for which you could vary the wavelength while keeping the frequency constant'. The wavelength is the frequency measurement. Actually the computation is quite simple:

    300/frequency (Mhz) So 300/10 = 30 or 30 meters

    Just remember that something like 144 Mhz (2 meter in ham jargon) or 300/144 = 2.08
    Antenna are based on the wavelength.

    The wavelength gets 'shorter' as the frequency increases.

    Just thought I'd point that out, for future reference.
     
    Last edited: Sep 16, 2016
  16. kayjabbar

    Thread Starter Member

    Sep 8, 2016
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    Guys im not looking for a long range transmitter and reciever...most of the links are for long range tranmission.
    My objective is to transmit and receive between a very short length i.e. nearly 110mm.
    Im asking that these long range gunnplexers will work for this short tranmission?

    Check this link guys. LINK and THIS


    The pictures below are the desired setup of moisture measuring using microwave oscillator and sensor.
    Im exactly working on this project.


    Screenshot_2016-09-17-11-37-46-1.png Screenshot_2016-09-17-11-38-28-1.png Screenshot_2016-09-17-11-38-33-1.png
     
    Last edited: Sep 17, 2016
  17. bertus

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  18. jkwilborn

    New Member

    Jan 26, 2016
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    Of course they are for long range. Micro wave, as a general rule is communication (cooking, although related) and it's not a common thing to want to transmit a few mm or cm (wires are very cheap for this.) I suggest you google microwave diodes or avalanche diodes (usually occurring at micro wave frequencies.)

    Showing us the detector would help immensely assisting you. The data you provide seems to indicate a 'dielectric antenna' for a sensor, so any 'noise' generating diode should give you results properly selected for voltage and so forth. The 'gunn' diode is an avalanche diode I believe, used in many applications. That would be the lowest cost, but you will have to engineer the layout and boards for this, assuming the 'dielectric antenna' is actually on a PCB itself, instead of remotely mounted. I'm sure there's a wiki on them, even if short. This is old technology.

    Did you read the math about this process? It seems relatively complex (over my head), I hope you have the background for it. Best of luck
     
  19. BR-549

    Well-Known Member

    Sep 22, 2013
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    They ought to make microwave circuit boards like slide rules. Just glue your device on, and adjust for frequency.
     
  20. jkwilborn

    New Member

    Jan 26, 2016
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    They ought to make alchemy work.
     
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