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Type: Posts; User: BigBoss

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  1. Closed: Re: Any way to make a rounded rectangle non-plated hole in Altium?

    A hint... Place a SMD Square with Rounded Corners then place a Donut on it with a Drill Diameter smaller than Inner Circle ..
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    Closed: Re: Design of Isolator in Ansys Electronics

    You can of course use Ansys HFSS for that project but Ansys Design Environment is not very practical such designs.I recommend you to use Keysight ADS RF-Pro environment to simulated the planar...
  3. Closed: Re: Microstrip filter design: question about a part of a book

    Inductors can be considered Short Circuited Transmission Lines which are smaller than lambda/4
    Capacitors can similarly be considered Open Circuited Transmission Lines which are smaller than...
  4. Closed: Re: OCXO Freq Stability Vs. Layout design guidelines

    If the substrate is flexible, vias are possible-to my knowledge-in flexible pcbs..So, you can calculate convenient dimensions for ocxo output transmission line as "guided coplanar waveguide".
    But...
  5. Closed: Re: OCXO Freq Stability Vs. Layout design guidelines

    Use double side PCB and assign the Bottom layer as a pure GND then place copper pour between OCXO Ouput and Vcc,Vdd with Via stitching.
    -Since whole Bottom layer will be GND, Transmission Line can...
  6. Closed: Re: OCXO Freq Stability Vs. Layout design guidelines

    -I'd prefer to use a separate GND layer because GND will also act a heat-sink if OCXO is properly placed..
    Y1 width depends on the Desired Impedance for that OCXO.If this impedance is somehow...
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    Closed: Re: Microwave amplifier, component distance

    L1, as close as possbible to IC
    C3 very close to the end of L1 with strong GND connection.
  8. [SOLVED]Closed: Re: does copper tape need grounding when sheilding plastic enclosure

    It helps to prevent the noise coming from external noise sources.
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    Closed: Re: Zopt path bz Load pull as frequency increases

    There isn't any method to predict this.Either you measure ( best method ) or simulate .An approximate Analytic method is Load Line Theory of Mr. Cripps but it's just rough approximation.
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    Closed: Re: Load pull values as frequency increases

    I think you misunderstand the concept of Load Pull..
    Load Pull measurements/simulations are done for one frequency only at a time so there is no increments or decrements by frequency.
    There are...
  11. Closed: Re: microstrip low pass filter design issues with sonnet

    The Filter for 100 MHz cut-off frequency will be very large on FR4 substrate.But however it's feasible if you have sufficient space..
    LC Filter will be more practical with better attenuation and...
  12. Closed: Re: microstrip low pass filter design issues with sonnet

    OK, I have repeated the simulation with original datas and scaled the axis in according within the paper to compare.Looks good..
    The notch on S11 is not an issue.
  13. Closed: Re: microstrip low pass filter design issues with sonnet

    Look at the Ports that are very close to Box side.The filter should be symmetric as much as possible on X axis.So equal distances must be considered to bottom and top.
    Also, top cover height changes...
  14. Closed: Re: microstrip low pass filter design issues with sonnet

    If the Top Cover is Free Space, no problem.You can place any height for that but the Box is small for highest frequency as my understanding.
    Make the Box larger by its' free sides because the Box...
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    Closed: Re: Microwave Office CPW EM-Simulation

    There are errors..
    -Where the VIAS just besides/around the Microstrip Line ??There must be VIAS on both sides to implement CPWG.
    -If you have transferred this structure from ADS, there are some...
  16. Closed: Re: microstrip low pass filter design issues with sonnet

    "Unnamed" dielectric layer should obviously be Air and it represents the air gap over the metallic layer.It's OK but the height must be higher to prevent the approximate effect the metal layer...
  17. Closed: Re: microstrip low pass filter design issues with sonnet

    There are few errors..

    -Substrate dielectric coefficient has been marked being as 10.8 but you entered 4.4, why ??
    -There was a an additional substrate just over-neath of the GND, why ?? Is it a...
  18. Closed: Re: Using a diode connected transistor model in CST 3D simulation

    But the model which you have written above is a nonlinear MOS model.CST cannot understand those statements..
    All you can do is to linearize that diode as you have remarked so diode will have simple...
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    Closed: Re: PAE contours in Cadence spectre

    You can use Harmonic Tuner ( or something like that ) to obtain PAE curves in Cadence ADE Spectre.
    I did it long time ago but it ought to have Magnitude and Phase fields to be filled.You may define...
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    Closed: Re: Half wave rectifier design ADS

    If you have nonlinear model of the diode, you can make a HB simulation with appropriate ports and sources.
    By the way, you can also make a transient simulation..
  21. Closed: Re: Using a diode connected transistor model in CST 3D simulation

    CST Microwave Studio does not simulate active elements..
    Passive components only such as filters,cavities,lumped passive components,antennas etc.
  22. Closed: Re: Combining 2 power amplifiers in different frequencies to widen bandwidth

    Phase can be adjusted by observing the output so max. signal level can be achieved by aligning phase at the input of the "other" amplifier.The other amplifier can contribute to the level of the...
  23. Closed: Re: Combining 2 power amplifiers in different frequencies to widen bandwidth

    PAs are NOT connected in series to improve the bandwidth.They are simply combined with a standard Wilkinson ( or similar ) to get a wider bandwidth.
    When the signal frequency is lower than 75 GHz...
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    Closed: Re: transformer S11 simulation

    Imagine an equivalent circuit of a standard transformer .. Not necessarily RF one, just a standard transformer.
    Which intrinsic and extrinsic elements define the Input Impedance ??
    -Primary...
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    Closed: Re: Broken RF ground plane

    Don't cut the GND plane, connect the LEDs' wires by jumpers over CPWG in air..( put at least 5mm or more height and use rigid jumper wires.)
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