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Type: Posts; User: Chinaski

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1. ## Thread: Looking for cavity filter design

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1,807

### Closed: Re: cavity filter design

Hi lambdaanttech
Watch if this thread helps you
Good luck
2. ## Thread: please solve this equation

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1,516

### Closed: Re: please solve this equation

There is no closed form solution. You have to integrate it numerically.
The function is very smooth between 0 and \pi. so you can use a low order Gaussian quadrature method. But before that, get a...
3. ## Thread: Inner dimensions of 2.4 female connector

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2
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1,352

### Closed: Re: 2.4 female connector

I think you can find them at Amphenol site
http://www.amphenolrf.com/products/precision.asp?N=0&sid=4C48DB8018DAE17F&
4. ## Thread: How to excite TM10 waves in a waveguide

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### Closed: Re: How to excite TM10 waves in a waveguide

Back to the basics...
David M. Pozar, "Microwave Engineering", Ed. John Wiley & Sons, Chapter three
5. ## Thread: How to excite TM10 waves in a waveguide

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2,961

### Closed: Re: How to excite TM10 waves in a waveguide

I don't get the point. Why do you want to use a TM mode? In rectangular waveguides TE10 or TE01 are always the dominant modes and you are surely going to excite them before a TM mode appears...
6. ## Thread: How to excite TM10 waves in a waveguide

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14
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2,961

### Closed: Re: How to excite TM10 waves in a waveguide

Assuming a cutoff freq of 150 MHz and a normalized waveguide (a=2b), you need a 1m x 0.5m waveguide for a TE10 mode (a bit large) Are you sure you want to use a waveguide for this freq?
In a...

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### Closed: Re: Please, please, please urgent help needed for 25GHz, fil

200 um is not unrealistic at 25 GHz It's very usual. Nevertheless, your specs are a bit fuzzy. What should be the attenuation in the stop bands? Flat or equirripple bandpass?...
8. ## Thread: Is the S21 plot result given in the voltage ratio or the power ratio in ADS Momentum?

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2,731

### Closed: Re: S21 in ADS Momentum

S parameters are actually power-wave ratios [W]^1/2. You cannot assume that all you reference port impedances are the same. I know, I know, we all are working with Z0i=50 but I'm a little academy...
9. ## Thread: power amplifier design help

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### Closed: Re: power amplifier design help

60 dB gain and 50 dBm output power? You need a multistage design, at least three...
10. ## Thread: 3 layer simulation in ADS

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3
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1,291

### Closed: Re: 3 layer simulation in ADS

If you put an ideal ground plane between the two substrates, there will be no coupling between them.
You have to put slots on the ground plane or vias between cond and cond2
Good luck
11. ## Thread: what can i deduce from the following eye_diagram?

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1,417

### Closed: Re: what can i deduce from the following eye_diagram?

Simulations are far away from real life, sure.
:-)
12. ## Thread: What causes my simulation so inaccurate?

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3
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1,281

### Closed: Re: What causes my simulation so inaccurate?

Just watching the results (dds file) , inductance reads 0.45 nH (4.47e.10) not 44.7 nH.
13. ## Thread: construct Chebyshev 5-Element Low-Pass Filter

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3
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2,131

### [SOLVED]Closed: Re: construct Chebyshev 5-Element Low-Pass Filter

http://hamwaves.com/antennas/inductance.html
I have used it to design an HF (3-30 MHz) filter bank and it works fine (at least for me)
Be careful, i'ts not a synthesis tool but it's useful if you...
14. ## Thread: design of half wave dipole antenna

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2,517

### Closed: Re: design of half wave dipole antenna

You can design a half length dipole at whatever freq you want and you don't need any sophisticated tool (freely NEC versions are enough, even paper and pencil). I think vfone says that, even if you...
15. ## Thread: Antenna array design problem

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1,270

### Closed: Re: Antenna array design problem

Hi
Your two antenna ports has a phase difference of 30 degrees. Thats true. But it doesn't mean your array is going to point its maximum towards thetha=30
Assuming that:

the distance between...
16. ## Thread: Designing first order Butterworth low pass filter

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### Closed: Re: Designing first order Butterworth low pass filter

Better go to your desk and try to do your homework by yourself. You have no doubts, you only want somebody do your homework for you.
BTW if you are unable to analyze a 1st order butterworth... back...
17. ## Thread: predistortion and S-parameter (S11) unmatch problem

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### Closed: Re: predistortion and S-parameter (S11) unmatch problem

As biff44 said
Maybe...
18. ## Thread: how to insert resistor into the patch antenna design

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3
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1,753

### Closed: Re: how to insert resistor into the patch antenna design

Put a via grounded SMD resistor at the vertex and take care with the inductance introduced by the SMD component and the via.
BTW while it seems to be a good way to decrease the resonant frequency...
19. ## Thread: how to find separation between antenna

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### Closed: Re: how to find separation between antenna

Ejem.
Using the info you are providing its's more or less 46.5 billion light-years (the radius of the observable universe) :-)
Seriously. Try to be be more precise: application, frequency, etc......
20. ## Thread: Send your resumes for VLSI jobs

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### Closed: Re: Send your resumes for VLSI jobs

Does anybody see this job proposal was posted _three_ years ago? They have got enough time to hire a bunch of engineers since then (and probably they, the engineers, have been fired off)
21. ## Thread: Constant amplitude amplifier

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2,956

### Closed: Re: Constant amplitude amplifier

Your question is not very clear (at least for me).
1) You ask for an amp with constant voltage output. Ok, you need a variable gain amp plus an Automatic Gain Control to (AGC or ALC) to maintain...

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Zorro explained it very well. This combination of math symbols just has no meaning at all. Your question is similar to ask for "... how can I evaluate 5+*/7= ?..."

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### Closed: Re: please help me to solve this integration

Sure, but using pencil and paper is more funny. BTW, I'm a Math user since 1992 :wink:

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### Closed: Re: please help me to solve this integration

ArcTan[(Sqrt[ b^2-a^2] x)/(a Sqrt[b^2 + x^2])]/(a Sqrt[ b^2-a^2])

For a more general formula see Gradshteyn & Ryzhik 2.283 and 2.284
Hint: Try x/Sqrt[x^2+b^2]=t